Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 464b1e629ff304f6…

MALICIOUS

Office (OLE) / .XLS

87.5 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 3bbacb816fe19558f1181cc5ad77bacc SHA-1: 1f031dd23e3976c96422a802fb8c14227b2e7d8c SHA-256: 464b1e629ff304f632bb9a499da2d225f9ce72e6b1e7733717a798d5bcc9822a
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The sample exhibits high-severity heuristic firings for CreateProcess and ShellExecute API calls, indicating an attempt to execute external processes. The large slack space in the OLE document suggests potential obfuscation or embedded malicious content. While no specific URLs were flagged as malicious, the presence of these API calls strongly suggests a downloader or dropper functionality. The document body content appears benign, but the underlying structure and API usage point towards malicious intent.

Heuristics 4

  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 89,600 bytes but its declared streams total only 21,308 bytes — 68,292 bytes (76%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wicker.senate.gov/public/index.cfm?fuseaction=contact.emailsenatorwicker%
    • http://inhofe.senate.gov/contactus.htm
    • http://gillibrand.senate.gov/contact
    • http://kerry.senate.gov/v3/contact/email.html
    • http://boxer.senate.gov/contact/webform.html
    • http://feingold.senate.gov/contact_opinion.html$
    • http://dodd.senate.gov/webmail
    • http://webb.senate.gov/contact
    • http://bradsherman.house.gov/sherman/contact
    • http://www.house.gov/writerep

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