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

Static analysis result for SHA-256 3b0efea26fe17e55…

MALICIOUS

Office (OLE) / .XLS

102.1 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 543626faeacd3b9fae924011c9239fce SHA-1: 8b55f351fd75eb9c0200e2e011dfad1d45f1a138 SHA-256: 3b0efea26fe17e55b31469655941ac8b9747a2468daff242976d99ca45653843
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The critical heuristic firing indicates exploitation of CVE-2009-3129, a known vulnerability in Microsoft Excel. This suggests the file is designed to deliver a malicious payload upon opening. The OLE slack anomaly further supports the presence of unusual or hidden data within the file structure. While no specific family is identified, the exploit mechanism points to a malicious Excel document.

Heuristics 3

  • CVE-2009-3129 — Excel FEATHEADER record overflow critical CVE exact CVE_2009_3129
    Workbook BIFF stream contains a FEATHEADER (Feature Header) record with anomalous size (record_size=22, isf=4, cbHdrData=4). Legitimate FEATHEADER records are tiny (<100 bytes) and carry cbHdrData values that fit in the record body; the value here is the documented CVE-2009-3129 exploit primitive — cbHdrData drives a memcpy with attacker-controlled size, leading to memory corruption and code execution in Excel 2007/2003.
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 104,510 bytes but its declared streams total only 24,565 bytes — 79,945 bytes (76%) 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).
  • 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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