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

Static analysis result for SHA-256 7c0f29ef85067bf3…

MALICIOUS

Office (OLE) / .XLS

112.1 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 616ac442c44e6d6591153ac791149044 SHA-1: 63994c5222a3abff2bc5aba73596dddb76c5973c SHA-256: 7c0f29ef85067bf3ef5333707e06e6453678a75e5d6429ca4a9a5e8c9c67ec20
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file that triggers the CVE-2009-3129 vulnerability due to a FEATHEADER record overflow. This indicates an attempt to exploit a client execution vulnerability. The presence of embedded URLs, though some are confirmed benign, suggests a potential delivery or command-and-control vector. No scripts were extracted from this sample.

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 114,750 bytes but its declared streams total only 24,565 bytes — 90,185 bytes (79%) 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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