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

Static analysis result for SHA-256 a2290388f261adbd…

MALICIOUS

Office (OLE) / .XLS

119.1 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 1a7bb669f0fcbdde284b808c185411ff SHA-1: b55cee638a147033c5314a24fd5523e413a79d9a SHA-256: a2290388f261adbd7e77493ba510e5acce13f9a30f8f71b1d6897c04c6beab12
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Exploitation for Client Execution

The critical heuristic firing indicates exploitation of CVE-2009-3129, a known vulnerability in Microsoft Excel. The OLE slack anomaly further suggests manipulation of the file structure. While no document body or scripts were extracted, the presence of unknown URLs related to 'pdf-repair.com' suggests a potential lure or download site for a secondary payload.

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 121,918 bytes but its declared streams total only 24,565 bytes — 97,353 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).
  • 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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