Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3f2b81857cf75324…

MALICIOUS

Office (OLE)

92.6 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 731ff18862f5e655ed64b69ee695dd21 SHA-1: d969b5e766778c62122543b347137e7aac204088 SHA-256: 3f2b81857cf75324dc40cc37161caff13d05ee2ccf41670f7f82b74c2d90c86a
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1204.002 Malicious File

The sample exhibits suspicious characteristics including a large slack space anomaly in its OLE structure and a high-confidence heuristic firing for suspicious cmd.exe invocation. The PEB access heuristic further suggests potential evasion or malicious activity. The embedded URLs, while some are confirmed benign, include references to 'pdf-repair.com' which could be a lure. The primary attack vector appears to be command execution, likely for payload delivery.

Heuristics 4

  • PEB access via FS segment (x86) high SC_PEB_ACCESS
    PEB access via FS segment (x86)
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 94,782 bytes but its declared streams total only 24,565 bytes — 70,217 bytes (74%) 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://www.pdf-repair.com
    • http://www.pdf-repair.com)/Producer(Advanced
    • http://www.pdf-repair.com)/ModDate(D:20100406171120+08
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

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