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Monday, 19 November 2018

Deobfuscation tips: RTF files

Introduction

This blog post outlines the findings I came across of when analysing different types of data obfuscation found in malicious RTF files. The research included performing static and dynamic analysis of publicly available samples used for delivering the commodity malware. The main goal was to understand how native RTF parser is treating unexpected data in control word groups, such as 'objdata'.

Executive Summary

Information in this blog post is intended for cybersecurity researchers and specialists developing RTF file parsers. The research is based on the work already performed by other cybersecurity researchers and firms. Its goal is to put some additional content on their work to enable the audience not so much familiar with this area to better understand it.

As a part of this research, over 2000 experiments were performed. Each experiment aimed at establishing Microsoft native RTF parser behavior when processing unexpected data. Knowing this behavior allows for reconstruction of the data otherwise obfuscated for the purpose of hiding the malicious content and impeding the static signature based detection.

Analysis

Disclaimer: The results observed might be specific to the test environment used. The same results can be achieved by using other open/close source tools.

Obfuscation / Obfuscation Types
RTF files allow for a broad range of data obfuscation techniques. FireEye Threat Research group and Kaspersky Labs explained most common techniques in their blog posts here and here. Where almost all of the techniques highlighted in the reports are still being used by the threat actors, there were a few additions in the last 2.5 years. See the carousel below for some of the most common obfuscation types:



Having such a variety of obfuscation techniques, makes it difficult to perform static analysis of the files generated using those techniques. To be able to manually reconstruct the obfuscated objects, one would require to know how RTF reader 'state machine' (Rich Text Format (RTF) Specification, Version 1.9.1 (page 212)) will interpreter the data it reads.

The most trickiest part is the destination control word - '\*'. According to RTF Specification Document, it serves the following purpose - 'Marks a destination whose text should be ignored if not understood by the RTF reader.' It would be great if it was just that, but apparently its behavior is a bit trickier due to the way it affects RTF reader internal state. Here is another comment on this control word from the specification document advising on things to consider when building an RTF parser.

Always understand \*

One of the most important things an RTF reader can do is to understand the \* control. This control introduces a destination that is not part of the document. It tells the RTF reader that if the reader does not understand the next control word, then it should skip the entire enclosing group.

Somewhat straight forward, but what happens when the RTF reader DOES understand the control word? How the RTF reader state is going to be affected by the data contained in the destination group?

This blog post will attempt to shed some light on this very subject. The goal of my research was to establish the Microsoft native RTF parser behavior when it encounters 'extra' groups or control words in 'objdata' groups. Having done some OSINT research, I came to understanding that it's difficult to identify with 100% certainty how a given unexpected data will be processed. It all boils down to the RTF control words and their ability to consume (or not) the data right after them.

According to RTF specification document, there are 1814 control words. They are split into following 5 groups:
  • Destinations
  • Flags
  • Symbols
  • Toggles
  • Values
Most commonly used in the 'objdata' group obfuscation are: destinations, symbols and flags. What adds an extra bit of complexity is the '\*' control word. As will be shown later, the control words data consumption behavior is different whether it's used inside a destination group or not.

The approach I've taken to identify the control words behavior is quite simple. I took all the destination and flags control words and generated simple RTF files with them being inside a destination group and not. See below for an example:


All in all, I ended up with 2358 RTF files. Fair question raises, how on Earth you're going to analyse 2358 files? On Earth, the answer is really simple - manually opening each one of them and witnessing the result with your own eyes.

No matter how sad of a person some people might think I am after opening 2358 RTF files with Microsoft Office Word, I recorded the results and built a searchable table (see Appendix section) to help me find a control word behavior depending on its group location. Click on the 'Show' button below to see an example of a search:



Consumes data means that any data following the control word will be consumed by it and will NOT be present in the final 'objdata' group data. Following the example of a control word given above, see how it affects the 'objdata' group data below:

{\*\objdata 010500000200000008000000{\*\mmaxdist 5061636b616765000} 000000000}
{\*\objdata 010500000200000008000000000000000}
{\*\objdata 010500000200000008000000{\mmaxdist 5061636b616765000} 000000000}
{\*\objdata 0105000002000000080000005061636b616765000000000000}

The table might come handy when building RTF parsing tools or peeling off some simple obfuscation, but when things become a bit complicated we need a better approach. The section below describes a method that proved to work with any obfuscation types.

The Silver Bullet
NOTE: It is strongly recommended that the following procedures to be performed in an environment you may allow to be compromised.

FireEye report mentioned previously discusses a 'silver bullet' approach to deobfuscating OLE objects embedded in RTF files. The gist of it is to intercept the call to 'OleConvertOLESTREAMToIStorage' function. The interception will allow to extract the reconstructed OLE object before it's passed for further processing. The object will be fully deobfuscated as per Microsoft's native RTF parser logic.

The section below is a walk-through for this method using x32dbg. Should you be manually analysing an obfuscated RTF file or building an automation tools, the procedure below might come helpful.

Test Environment
The following test environment was used:
  • Virtualization: Virtual Box (5.2.10)
  • Guest OS: Windows 7 Professional SP1
  • Host Application: Microsoft Office 2007 (12.0.4518.1014)
  • Debugger: x32dbg (build Aug 12 2018, 23:03:57)
  • Text Editor: Notepad++ (v7.5.9 64-bit)
Pre-debugging Steps
Before opening a test RTF sample in Microsoft Word, the following steps must be completed:
  1. start Microsoft Word application
  2. start x32dbg application
  3. in x32dbg, go File -> Attach
  4. in the 'Attach' window, select 'WINWORD'
  5. click Attach button
  6. press F9 or click Run button in the top tool bar
Click 'Show' button below to see steps 3 - 6.



Debugging
NOTE: The following steps are based on this sample bcde46711f4b7c1b7cc0b2e490748472c04fdc74

Fair amount of obfuscation techniques is used in this test sample. It'll be rather challenging to reconstruct the embedded OLE object manually. Before opening the sample with Microsoft Word, we need to setup a breakpoint on 'OleConvertOLESTREAMToIStorage' function call. The steps below describe one way of doing it:

  1. in x32dbg, go to Symbols tab
  2. click anywhere in the left pane and start typing ole32.dll
  3. click anywhere in the right pane and start typing OleConvertOLESTREAMToIStorage
  4. once the view is filtered, find reference to OleConvertOLESTREAMToIStorage and click on it
  5. press F2 or right click on it and select Toggle Breakpoint
  6. switch to Breakpoints tab and make sure there is an entry for OleConvertOLESTREAMToIStorage function call
Click 'Show' button below to see steps in action.



Now we're ready to open the test sample with Microsoft Word application and intercept the call to 'OleConvertOLESTREAMToIStorage' function. This will allow us to extract the embedded OLE object directly from the memory after it was assembled by Microsoft's native RTF parser. Follow the steps below:

  1. in Microsoft Word, click on Office Button and select Open
  2. navigate to the location where the sample is stored
  3. double-click on the file or select the file and click Open button
  4. switch to x32dbg

At this stage we have loaded test sample into Microsoft Word and stopped its execution at 'OleConvertOLESTREAMToIStorage' function call. Our next step will be finding the assembled OLE object in the memory. Follow the steps below:

  1. in x32dbg, right-click on the second line from the top in the stack pane
  2. select Follow DWORD in Dump
  3. select the DWORD value(4 bytes) in the third column of the first line in Dump 1 tab
  4. right-click the selected value and expand Follow DWORD in Dump menu
  5. select Dump 2 option
  6. select the DWORD value(4 bytes) in the first column of the first line in Dump 2 tab
  7. right-click the selected value and click Follow DWORD in Current Dump option

Dump 2 tab is now showing the embedded OLE object in the memory after it has been parsed by the native RTF parser. It's now fully assembled and all the data obfuscation is removed. Before we can extract the object from the memory, we need to take a note of the memory address where it's located and its length.

The address is currently being shown on the first line in Dump 2 tab. The length value is located next to the value we selected first in Dump 1 tab. Switch to 'Dump 1' tab and take a note of the value in the fourth column of the first line. Our next step is to carve it out of the memory and save it to the disk. Follow the steps below to do so:

  1. click on Command text entry field (located at the bottom of x32dbg window)
  2. type savedata :memdump:, mem_addr, length
  3. press Enter key

The OLE object is now saved in X64DBG_INSTALL_PATH\release\x32\memdumps folder.

Click 'Show' button below to see all those steps in action.



If RTF file contains multiple embedded OLE objects, pressing F9 will continue the Microsoft Word execution until the next OLE object is passed to 'OleConvertOLESTREAMToIStorage' function. At this point tough, there is no guarantee your test machine will not be infected. Proceed with caution!

Aftermath
In this section we will review the results using some of the data obfuscation examples found in the original RTF sample file. If you wish to follow along, open it in a text editor. I'll be using 'Notepad++' and referencing pieces of data by their line positions in the file. You will also need a hex viewer/editor of your choice.

First, let's describe the 'objdata' group that starts on line 67.

There are 2 groups that follow it right after its declaration - line 71. Each group contains 3 control words followed by a piece of data.


Sequence of \' special characters begins on line 77. Their general purpose is to represent a HEX value, based on the specified character set, but as can be seen in the given examples, the 'HEX' characters do not conform to hex value representation format.


Plain text data begins on line 80 and followed by another special characters obfuscation starting on line 83.


Interesting group at line 95 contains a non-printable character followed by a hex string. This group also preceded by destination control word - '\*'.


Another group (line 100) containing 2 control words.


Sequence of escaped expressions begins at line 103.


The last interesting piece for us is on line 111 - \bin control word is used to convert 'P' character into a hex value.


Now open the OLE object carved from the memory in a hex viewer/editor. The carved object begins with the following bytes: 88 D1 4E 04 02 00 00 00. The same sequence can be found in the original RTF sample file starting at line 80. This means that all the data from the beginning of 'objdata' group (line 67) up to line 80 has been discarded. This includes the 2 groups and the sequence of \' special characters we noted earlier.


The data from the interesting group at line 95 does not appear to be present in the carved OLE object. We can easily locate the data preceding it - 00 6F 00 74 00 20 00 45 00 6E 00 74 00 72 00 (offset 0x42D), but not the data from the group. Byte 79(offset 0x43C) follows the preceding data, meaning the interesting group data has been discarded.


As expected the data from the group at line 100 has been discarded, but the sequence of escaped expressions appear to be present in the carved OLE object. It begins at offset 0x43D and ends at 0x829.


The last piece of data we're interested in is the one supplied to \bin control word. It's only 1 byte long and it's represented by 'P' character in the original RTF sample. We would expect it to follow the sequence of escaped expressions and the plain text string - 700 located at line 108.


Character P has a hex value of 50. Our expected byte sequence is 70 05 00 00 02 D3, but interestingly enough, there isn't such byte sequence present in the carved OLE object. Something isn't the way we expected it to be after analysing the original RTF file manually. According to the native RTF parser, this data transforms into this byte sequence - 70 50 00 00 02 D3.


Couple of things to note here:
  • the last 0 in 700 string disappears
  • the number of zeros after 50 (P converted to hex) is 5 and not expected 4

The last example shows how unexpected the results can be when trying to deobfuscate RTF embedded OLE objects manually. Where doing it this way is fun and challenging, the only way to make sure the deobfuscation has been successful is to compare it with the results of Microsoft's native RTF parser.

Credits

Huge shout out to Andrew Torres for crash course on Microsoft Office applications debugging with x32dbg and overall feedback. This dude is a wizard!
Kudos to Decalage and Didier Stevens for peer reviewing the wall of text above. I really appreciate it, folks!


Appendix

Control Words Search Table

Control Word Destination Flag (FALSE) Destination Flag (TRUE)
ApplyBrkRules Does not consume data Does not consume data
abslock Does not consume data Does not consume data
additive Does not consume data Does not consume data
adjustright Does not consume data Does not consume data
aenddoc Does not consume data Does not consume data
aendnotes Does not consume data Does not consume data
afelev Does not consume data Does not consume data
aftnbj Does not consume data Does not consume data
aftncn Consumes data Consumes data
aftnnalc Does not consume data Does not consume data
aftnnar Does not consume data Does not consume data
aftnnauc Does not consume data Does not consume data
aftnnchi Does not consume data Does not consume data
aftnnchosung Does not consume data Does not consume data
aftnncnum Does not consume data Does not consume data
aftnndbar Does not consume data Does not consume data
aftnndbnum Does not consume data Does not consume data
aftnndbnumd Does not consume data Does not consume data
aftnndbnumk Does not consume data Does not consume data
aftnndbnumt Does not consume data Does not consume data
aftnnganada Does not consume data Does not consume data
aftnngbnum Does not consume data Does not consume data
aftnngbnumd Does not consume data Does not consume data
aftnngbnumk Does not consume data Does not consume data
aftnngbnuml Does not consume data Does not consume data
aftnnrlc Does not consume data Does not consume data
aftnnruc Does not consume data Does not consume data
aftnnzodiac Does not consume data Does not consume data
aftnnzodiacd Does not consume data Does not consume data
aftnnzodiacl Does not consume data Does not consume data
aftnrestart Does not consume data Does not consume data
aftnrstcont Does not consume data Does not consume data
aftnsep Consumes data Consumes data
aftnsepc Consumes data Consumes data
aftntj Does not consume data Does not consume data
allowfieldendsel Does not consume data Does not consume data
allprot Does not consume data Does not consume data
alntblind Does not consume data Does not consume data
alt Does not consume data Consumes data
annotation Consumes data Consumes data
annotprot Does not consume data Does not consume data
ansi Does not consume data Does not consume data
asianbrkrule Does not consume data Does not consume data
atnauthor Consumes data Consumes data
atndate Consumes data Consumes data
atnicn Does not consume data Consumes data
atnid Consumes data Consumes data
atnparent Consumes data Consumes data
atnref Consumes data Consumes data
atntime Does not consume data Consumes data
atrfend Consumes data Consumes data
atrfstart Consumes data Consumes data
author Consumes data Consumes data
autofmtoverride Does not consume data Does not consume data
background Consumes data Consumes data
bdbfhdr Does not consume data Does not consume data
bdrrlswsix Does not consume data Does not consume data
bgbdiag Does not consume data Does not consume data
bgcross Does not consume data Does not consume data
bgdcross Does not consume data Does not consume data
bgdkbdiag Does not consume data Does not consume data
bgdkcross Does not consume data Does not consume data
bgdkdcross Does not consume data Does not consume data
bgdkfdiag Does not consume data Does not consume data
bgdkhoriz Does not consume data Does not consume data
bgdkvert Does not consume data Does not consume data
bgfdiag Does not consume data Does not consume data
bghoriz Does not consume data Does not consume data
bgvert Does not consume data Does not consume data
bkmkend Consumes data Consumes data
bkmkpub Does not consume data Does not consume data
bkmkstart Consumes data Consumes data
blipuid Consumes data Consumes data
bookfold Does not consume data Does not consume data
bookfoldrev Does not consume data Does not consume data
box Does not consume data Does not consume data
brdrb Does not consume data Does not consume data
brdrbar Does not consume data Does not consume data
brdrbtw Does not consume data Does not consume data
brdrdash Does not consume data Does not consume data
brdrdashd Does not consume data Does not consume data
brdrdashdd Does not consume data Does not consume data
brdrdashdot Does not consume data Does not consume data
brdrdashdotdot Does not consume data Does not consume data
brdrdashdotstr Does not consume data Does not consume data
brdrdashsm Does not consume data Does not consume data
brdrdb Does not consume data Does not consume data
brdrdot Does not consume data Does not consume data
brdremboss Does not consume data Does not consume data
brdrengrave Does not consume data Does not consume data
brdrframe Does not consume data Does not consume data
brdrhair Does not consume data Does not consume data
brdrinset Does not consume data Does not consume data
brdrl Does not consume data Does not consume data
brdrnil Does not consume data Does not consume data
brdrnone Does not consume data Does not consume data
brdroutset Does not consume data Does not consume data
brdrr Does not consume data Does not consume data
brdrs Does not consume data Does not consume data
brdrsh Does not consume data Does not consume data
brdrt Does not consume data Does not consume data
brdrtbl Does not consume data Does not consume data
brdrth Does not consume data Does not consume data
brdrthtnlg Does not consume data Does not consume data
brdrthtnmg Does not consume data Does not consume data
brdrthtnsg Does not consume data Does not consume data
brdrtnthlg Does not consume data Does not consume data
brdrtnthmg Does not consume data Does not consume data
brdrtnthsg Does not consume data Does not consume data
brdrtnthtnlg Does not consume data Does not consume data
brdrtnthtnmg Does not consume data Does not consume data
brdrtnthtnsg Does not consume data Does not consume data
brdrtriple Does not consume data Does not consume data
brdrwavy Does not consume data Does not consume data
brdrwavydb Does not consume data Does not consume data
brkfrm Does not consume data Does not consume data
buptim Consumes data Consumes data
bxe Does not consume data Does not consume data
caccentfive Does not consume data Does not consume data
caccentfour Does not consume data Does not consume data
caccentone Does not consume data Does not consume data
caccentsix Does not consume data Does not consume data
caccentthree Does not consume data Does not consume data
caccenttwo Does not consume data Does not consume data
cachedcolbal Does not consume data Does not consume data
category Consumes data Consumes data
cbackgroundone Does not consume data Does not consume data
cbackgroundtwo Does not consume data Does not consume data
cfollowedhyperlink Does not consume data Does not consume data
chbgbdiag Does not consume data Does not consume data
chbgcross Does not consume data Does not consume data
chbgdcross Does not consume data Does not consume data
chbgdkbdiag Does not consume data Does not consume data
chbgdkcross Does not consume data Does not consume data
chbgdkdcross Does not consume data Does not consume data
chbgdkfdiag Does not consume data Does not consume data
chbgdkhoriz Does not consume data Does not consume data
chbgdkvert Does not consume data Does not consume data
chbgfdiag Does not consume data Does not consume data
chbghoriz Does not consume data Does not consume data
chbgvert Does not consume data Does not consume data
chbrdr Does not consume data Does not consume data
chyperlink Does not consume data Does not consume data
clFitText Does not consume data Does not consume data
clNoWrap Does not consume data Does not consume data
clbgbdiag Does not consume data Does not consume data
clbgcross Does not consume data Does not consume data
clbgdcross Does not consume data Does not consume data
clbgdkbdiag Does not consume data Does not consume data
clbgdkcross Does not consume data Does not consume data
clbgdkdcross Does not consume data Does not consume data
clbgdkfdiag Does not consume data Does not consume data
clbgdkhor Does not consume data Does not consume data
clbgdkvert Does not consume data Does not consume data
clbgfdiag Does not consume data Does not consume data
clbghoriz Does not consume data Does not consume data
clbgvert Does not consume data Does not consume data
clbrdrb Does not consume data Does not consume data
clbrdrl Does not consume data Does not consume data
clbrdrr Does not consume data Does not consume data
clbrdrt Does not consume data Does not consume data
cldel Does not consume data Does not consume data
cldgll Does not consume data Does not consume data
cldglu Does not consume data Does not consume data
clhidemark Does not consume data Does not consume data
clins Does not consume data Does not consume data
clmgf Does not consume data Does not consume data
clmrg Does not consume data Does not consume data
clmrgd Does not consume data Does not consume data
clmrgdr Does not consume data Does not consume data
clshdrawnil Does not consume data Does not consume data
clsplit Does not consume data Does not consume data
clsplitr Does not consume data Does not consume data
cltxbtlr Does not consume data Does not consume data
cltxlrtb Does not consume data Does not consume data
cltxlrtbv Does not consume data Does not consume data
cltxtbrl Does not consume data Does not consume data
cltxtbrlv Does not consume data Does not consume data
clvertalb Does not consume data Does not consume data
clvertalc Does not consume data Does not consume data
clvertalt Does not consume data Does not consume data
clvmgf Does not consume data Does not consume data
clvmrg Does not consume data Does not consume data
cmaindarkone Does not consume data Does not consume data
cmaindarktwo Does not consume data Does not consume data
cmainlightone Does not consume data Does not consume data
cmainlighttwo Does not consume data Does not consume data
collapsed Does not consume data Consumes data
colorschememapping Consumes data Consumes data
colortbl Consumes data Consumes data
comment Consumes data Consumes data
company Consumes data Consumes data
contextualspace Does not consume data Does not consume data
creatim Consumes data Consumes data
ctextone Does not consume data Does not consume data
ctexttwo Does not consume data Does not consume data
ctrl Does not consume data Does not consume data
cvmme Does not consume data Does not consume data
datafield Consumes data Consumes data
datastore Consumes data Consumes data
date Does not consume data Does not consume data
dbch Does not consume data Does not consume data
defchp Consumes data Consumes data
defformat Does not consume data Does not consume data
defpap Consumes data Consumes data
defshp Does not consume data Does not consume data
dgmargin Does not consume data Does not consume data
dgsnap Does not consume data Consumes data
dntblnsbdb Does not consume data Does not consume data
do Consumes data Consumes data
dobxcolumn Does not consume data Does not consume data
dobxmargin Does not consume data Does not consume data
dobxpage Does not consume data Does not consume data
dobymargin Does not consume data Does not consume data
dobypage Does not consume data Does not consume data
dobypara Does not consume data Does not consume data
doccomm Consumes data Consumes data
doctemp Does not consume data Consumes data
docvar Consumes data Consumes data
dolock Does not consume data Does not consume data
donotshowcomments Does not consume data Does not consume data
donotshowinsdel Does not consume data Does not consume data
donotshowmarkup Does not consume data Does not consume data
donotshowprops Does not consume data Does not consume data
dpaendhol Does not consume data Does not consume data
dpaendsol Does not consume data Does not consume data
dparc Does not consume data Does not consume data
dparcflipx Does not consume data Does not consume data
dparcflipy Does not consume data Does not consume data
dpastarthol Does not consume data Does not consume data
dpastartsol Does not consume data Does not consume data
dpcallout Does not consume data Does not consume data
dpcoaccent Does not consume data Does not consume data
dpcobestfit Does not consume data Does not consume data
dpcoborder Does not consume data Does not consume data
dpcodabs Does not consume data Does not consume data
dpcodbottom Does not consume data Does not consume data
dpcodcenter Does not consume data Does not consume data
dpcodtop Does not consume data Does not consume data
dpcominusx Does not consume data Does not consume data
dpcominusy Does not consume data Does not consume data
dpcosmarta Does not consume data Does not consume data
dpcotdouble Does not consume data Does not consume data
dpcotright Does not consume data Does not consume data
dpcotsingle Does not consume data Does not consume data
dpcottriple Does not consume data Does not consume data
dpellipse Does not consume data Does not consume data
dpendgroup Does not consume data Does not consume data
dpfillbgpal Does not consume data Does not consume data
dpfillfgpal Does not consume data Does not consume data
dpgroup Does not consume data Does not consume data
dpline Does not consume data Does not consume data
dplinedado Does not consume data Does not consume data
dplinedadodo Does not consume data Does not consume data
dplinedash Does not consume data Does not consume data
dplinedot Does not consume data Does not consume data
dplinehollow Does not consume data Does not consume data
dplinepal Does not consume data Does not consume data
dplinesolid Does not consume data Does not consume data
dppolygon Does not consume data Does not consume data
dppolyline Does not consume data Does not consume data
dprect Does not consume data Does not consume data
dproundr Does not consume data Does not consume data
dpshadow Does not consume data Does not consume data
dptxbtlr Does not consume data Does not consume data
dptxbx Does not consume data Does not consume data
dptxbxtext Consumes data Consumes data
dptxlrtb Does not consume data Does not consume data
dptxlrtbv Does not consume data Does not consume data
dptxtbrl Does not consume data Does not consume data
dptxtbrlv Does not consume data Does not consume data
ebcend Consumes data Consumes data
ebcstart Consumes data Consumes data
emfblip Does not consume data Does not consume data
enddoc Does not consume data Does not consume data
endnhere Does not consume data Does not consume data
endnotes Does not consume data Does not consume data
expshrtn Does not consume data Does not consume data
faauto Does not consume data Does not consume data
facenter Does not consume data Does not consume data
facingp Does not consume data Does not consume data
factoidname Consumes data Consumes data
fafixed Does not consume data Consumes data
fahang Does not consume data Does not consume data
falt Consumes data Consumes data
faroman Does not consume data Does not consume data
favar Does not consume data Does not consume data
fbidi Does not consume data Does not consume data
fbidis Does not consume data Does not consume data
fbimajor Does not consume data Does not consume data
fbiminor Does not consume data Does not consume data
fchars Consumes data Consumes data
fdbmajor Does not consume data Does not consume data
fdbminor Does not consume data Does not consume data
fdecor Does not consume data Does not consume data
felnbrelev Does not consume data Does not consume data
fetch Does not consume data Consumes data
ffdeftext Consumes data Consumes data
ffentrymcr Consumes data Consumes data
ffexitmcr Consumes data Consumes data
ffformat Consumes data Consumes data
ffhelptext Consumes data Consumes data
ffl Consumes data Consumes data
ffname Consumes data Consumes data
ffstattext Consumes data Consumes data
fhimajor Does not consume data Does not consume data
fhiminor Does not consume data Does not consume data
field Consumes data Consumes data
file Consumes data Consumes data
filetbl Consumes data Consumes data
fjgothic Does not consume data Consumes data
fjminchou Does not consume data Consumes data
fldalt Does not consume data Does not consume data
flddirty Does not consume data Does not consume data
fldedit Does not consume data Does not consume data
fldinst Consumes data Consumes data
fldlock Does not consume data Does not consume data
fldpriv Does not consume data Does not consume data
fldrslt Consumes data Consumes data
fldtype Consumes data Consumes data
flomajor Does not consume data Does not consume data
flominor Does not consume data Does not consume data
fmodern Does not consume data Does not consume data
fname Does not consume data Consumes data
fnetwork Does not consume data Does not consume data
fnil Does not consume data Does not consume data
fnonfilesys Does not consume data Does not consume data
fontemb Consumes data Consumes data
fontfile Does not consume data Consumes data
fonttbl Consumes data Consumes data
footer Consumes data Consumes data
footerf Consumes data Consumes data
footerl Consumes data Consumes data
footerr Consumes data Consumes data
footnote Consumes data Consumes data
forceupgrade Does not consume data Does not consume data
formdisp Does not consume data Does not consume data
formfield Consumes data Consumes data
formprot Does not consume data Does not consume data
formshade Does not consume data Does not consume data
fracwidth Does not consume data Does not consume data
frmtxbtlr Does not consume data Does not consume data
frmtxlrtb Does not consume data Does not consume data
frmtxlrtbv Does not consume data Does not consume data
frmtxtbrl Does not consume data Does not consume data
frmtxtbrlv Does not consume data Does not consume data
froman Does not consume data Does not consume data
fromtext Does not consume data Does not consume data
fscript Does not consume data Does not consume data
fswiss Does not consume data Does not consume data
ftech Does not consume data Does not consume data
ftfalsetype Does not consume data Consumes data
ftnalt Does not consume data Does not consume data
ftnbj Does not consume data Does not consume data
ftncn Consumes data Consumes data
ftnil Does not consume data Does not consume data
ftnlytwnine Does not consume data Does not consume data
ftnnalc Does not consume data Does not consume data
ftnnar Does not consume data Does not consume data
ftnnauc Does not consume data Does not consume data
ftnnchi Does not consume data Does not consume data
ftnnchosung Does not consume data Does not consume data
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ftnndbnumd Does not consume data Does not consume data
ftnndbnumk Does not consume data Does not consume data
ftnndbnumt Does not consume data Does not consume data
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ftnngbnum Does not consume data Does not consume data
ftnngbnumd Does not consume data Does not consume data
ftnngbnumk Does not consume data Does not consume data
ftnngbnuml Does not consume data Does not consume data
ftnnrlc Does not consume data Does not consume data
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ftnsepc Consumes data Consumes data
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gridtbl Consumes data Consumes data
gutterprl Does not consume data Does not consume data
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headerr Consumes data Consumes data
hich Does not consume data Does not consume data
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hlfr Consumes data Consumes data
hlinkbase Consumes data Consumes data
hlloc Consumes data Consumes data
hlsrc Consumes data Consumes data
horzdoc Does not consume data Does not consume data
horzsect Does not consume data Does not consume data
hrule Consumes data Consumes data
hsv Consumes data Consumes data
htmautsp Does not consume data Does not consume data
htmlbase Does not consume data Consumes data
htmltag Does not consume data Consumes data
hwelev Does not consume data Does not consume data
indmirror Does not consume data Does not consume data
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intbl Does not consume data Does not consume data
ixe Does not consume data Does not consume data
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listpicture Consumes data Consumes data
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listtext Consumes data Consumes data
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maccPr Consumes data Consumes data
macpict Does not consume data Does not consume data
mailmerge Consumes data Consumes data
makebackup Does not consume data Does not consume data
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margPr Consumes data Consumes data
margmirror Does not consume data Does not consume data
margmirsxn Does not consume data Does not consume data
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mbegChr Consumes data Consumes data
mborderBox Consumes data Consumes data
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mhtmltag Does not consume data Consumes data
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mmPr Consumes data Consumes data
mmaddfieldname Consumes data Consumes data
mmath Does not consume data Does not consume data
mmathPict Consumes data Consumes data
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mmattach Does not consume data Does not consume data
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mmblanklines Does not consume data Does not consume data
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mmcs Consumes data Consumes data
mmdatasource Consumes data Consumes data
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mmheadersource Consumes data Consumes data
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mmodsotable Consumes data Consumes data
mmodsoudl Consumes data Consumes data
mmodsoudldata Consumes data Consumes data
mmodsouniquetag Consumes data Consumes data
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mshp Consumes data Consumes data
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mtransp Consumes data Consumes data
mtype Consumes data Consumes data
muser Does not consume data Does not consume data
mvertJc Consumes data Consumes data
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mzeroWid Consumes data Consumes data
nesttableprops Consumes data Consumes data
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oleclsid Consumes data Consumes data
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pgptbl Consumes data Consumes data
phcol Does not consume data Does not consume data
phmrg Does not consume data Does not consume data
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pn Consumes data Consumes data
pnacross Does not consume data Does not consume data
pnaiu Does not consume data Consumes data
pnaiud Consumes data Consumes data
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pnseclvl Consumes data Consumes data
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pntxtb Consumes data Consumes data
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prcolbl Does not consume data Does not consume data
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printim Consumes data Consumes data
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propname Consumes data Consumes data
protend Consumes data Consumes data
protstart Consumes data Consumes data
protusertbl Consumes data Consumes data
psover Does not consume data Does not consume data
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shp Consumes data Consumes data
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shpinst Consumes data Consumes data
shplockanchor Does not consume data Does not consume data
shppict Consumes data Consumes data
shprslt Consumes data Consumes data
shptxt Consumes data Consumes data
slocked Does not consume data Does not consume data
sn Consumes data Consumes data
snaptogridincell Does not consume data Does not consume data
softcol Does not consume data Does not consume data
softline Does not consume data Does not consume data
softpage Does not consume data Does not consume data
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spersonal Does not consume data Does not consume data
spltpgpar Does not consume data Does not consume data
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sprstsp Does not consume data Does not consume data
spv Does not consume data Does not consume data
sqformat Does not consume data Does not consume data
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writereservation Consumes data Consumes data
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xmlattr Consumes data Consumes data
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xmlattrvalue Consumes data Consumes data
xmlclose Consumes data Consumes data
xmlname Consumes data Consumes data
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xmlopen Consumes data Consumes data
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1 comment:

  1. Thank you for sharing this insightful blog post on deobfuscation tips for RTF files!I appreciate how you've summarized the executive summary, making it accessible to a broader audience not familiar with this area of expertise. By shedding light on the behavior of Microsoft native RTF parser when processing unexpected data, your work aids in reconstructing obfuscated content and enhances detection capabilities to combat malicious activities.

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