Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a92ed55dc17914b3…

MALICIOUS

Office (OLE)

11.5 KB Created: 1601-01-01 00:00:00 Authoring application: Microsoft Word 6.0 First seen: 2012-06-14
MD5: 1ddd6b10ab80fb8af8cf740e99cacacf SHA-1: c444c2b517710e0d9272a64869baef5093ca8ab2 SHA-256: a92ed55dc17914b30baa8abe45f7a1ad428a00c52e1866cba90640040e9bc345
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an OLE document with suspicious static findings, including empty streams and a directory cycle, indicating potential corruption or obfuscation. ClamAV detected it as Win.Trojan.NOP-4. The embedded OLE document itself has static triage findings, suggesting it is designed to exploit a vulnerability for client execution.

Heuristics 3

  • ClamAV: Win.Trojan.NOP-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.NOP-4
  • Embedded Office document has suspicious static findings critical EMBEDDED_OFFICE_CHILD_STATIC_TRIAGE
    A CFB/OLE Office document was found inside another file type and its carved contents matched Office exploit or payload heuristics. This catches wrapped exploit documents where the top-level file routes to a PE, archive, or generic scanner instead of Office.
  • CFB header with no readable streams medium OLE_PARSE_EMPTY_STREAMS
    The file begins with a valid OLE2/CFB header but exposes no directory streams. A non-empty compound document with an unreadable directory is anomalous — it is seen with truncated/corrupt files and, more importantly, with content deliberately shifted off byte boundaries to defeat parsers while the host application still recovers the object.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_office_off00001a40.ole embedded-office Embedded OLE/CFB Office body inside ole container at offset 0x1A40 5056 bytes
SHA-256: b3dfe1d64967e6d3357c134ae2b5f122cca07050c2526c7e0cead0b646852689

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