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

Static analysis result for SHA-256 98bcf0a6410e0bbf…

MALICIOUS

Office (OLE) / .XLS

138.1 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 5e1ed72f72eabffec7797c2dfe2d6f14 SHA-1: aa050f65330c5e079f910e9a74ccd09e485fd085 SHA-256: 98bcf0a6410e0bbfda43728b7856eea0c4f98de7ac9ac6d02d20ccc81d51cc63
82 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The OLE document exhibits anomalies with a large slack region and an appended executable payload, indicating it's designed to conceal malicious code. Although VBA macros could not be extracted due to an unsupported format, the presence of embedded URLs suggests a potential delivery mechanism. The appended payload is the primary indicator of malicious intent, likely serving to download and execute a second-stage payload.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 141,374 bytes but its declared streams total only 24,565 bytes — 116,809 bytes (83%) 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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