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

Static analysis result for SHA-256 fca288292817b993…

MALICIOUS

Office (OLE) / .XLS

116.6 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: a111968f7c7d39bdebb7d1028c798fb8 SHA-1: 0002b41b7930e107cf1b9b5fda66d2a284968790 SHA-256: fca288292817b9933ed1c03569a005cb17840f4fc44d3d755ff488fb6718acb5
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.003 Command and Scripting Interpreter: Windows Command Shell

The sample is an Excel file that triggers a critical heuristic for CVE-2009-3129, indicating an exploit for a known Excel vulnerability. High severity heuristics for PEB access and suspicious cmd.exe invocation suggest arbitrary code execution. The large slack space in the OLE document is also anomalous. The file's purpose is likely to exploit this vulnerability to gain initial access and potentially execute further payloads.

Heuristics 5

  • 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.
  • PEB access via FS segment (x86) high SC_PEB_ACCESS
    PEB access via FS segment (x86)
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 119,358 bytes but its declared streams total only 24,565 bytes — 94,793 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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