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

Static analysis result for SHA-256 a55158908cc86114…

MALICIOUS

Office (OLE) / .XLS

121.6 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 56343cc5e329aa00c859408894a9b652 SHA-1: 0412392751faa20d96a10c5c2a5a4f8ab6c8c451 SHA-256: a55158908cc861143d307eb94466b378535ec36eb4cf5287d6b468a49d125ad3
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The OLE document exhibits anomalies in its slack space and contains an appended executable payload, indicating a likely exploit attempt. Although VBA macros could not be extracted due to an unsupported format, the presence of embedded URLs, some with unknown reputation, suggests a delivery mechanism for malicious content. The file's structure and appended payload strongly suggest it is designed to execute arbitrary code upon opening.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 124,478 bytes but its declared streams total only 24,565 bytes — 99,913 bytes (80%) 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.
  • Unsupported Office format for VBA extraction info OFFICE_FORMAT_UNSUPPORTED
    olevba could not extract VBA macros (PermissionError); format-agnostic byte-level scans still ran. Likely legacy, encrypted, or malformed OLE/OOXML — re-scanning the same bytes will yield the same outcome.
  • 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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