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

Static analysis result for SHA-256 398a8bc40bcb1e6e…

MALICIOUS

Office (OLE) / .XLS

111.1 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 73273d1097de5997ed51825c36ec0f0c SHA-1: 3bce6c75d4bdedf2cf26ed8f7d180debc822a4e3 SHA-256: 398a8bc40bcb1e6e23b6e35f8de8c77016e6bfc23e386368e969da5e896b943c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The OLE document exhibits anomalies including a large slack region and an appended executable payload, indicating a likely attempt to conceal malicious content. While VBA macros could not be extracted due to an unsupported format, the presence of embedded URLs suggests a delivery mechanism. The appended payload is the primary indicator of malicious intent, likely serving as a downloader or initial execution stage.

Heuristics 4

  • 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.
  • 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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