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

Static analysis result for SHA-256 5ea1afb90a474d99…

MALICIOUS

Office (OLE) / .XLS

111.1 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 9c5e7fca1ad1f5b079e23d00b1260ff6 SHA-1: 21d159668ce472822e90fb4405f93cb18b05451a SHA-256: 5ea1afb90a474d9968c8e9c8ae3dcb1bde34533899705cfe0e4f6953ce5f9bd1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is an OLE document with significant slack space and an appended executable payload, indicating it's designed to deliver malware. The presence of embedded URLs, though mostly benign, suggests an attempt to connect to external resources. The overall structure points to a macro-enabled document used as a downloader.

Heuristics 3

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 113,726 bytes but its declared streams total only 24,565 bytes — 89,161 bytes (78%) 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).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
  • 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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