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

Static analysis result for SHA-256 90570ca83f339a09…

MALICIOUS

Office (OLE) / .XLS

116.6 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: ada07afcd97407931d8de80d74b247b0 SHA-1: 92491fd7a7f0573900fead7d99f8148a84906025 SHA-256: 90570ca83f339a09a7c301e0220cb6ac79a45f02578dc0773407355b25c4bc79
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.003 Windows Command Shell

The critical heuristic firing for CVE-2009-3129 indicates a vulnerability exploitation in the Excel FEATHEADER record. Additionally, a suspicious invocation of cmd.exe with an execution flag was detected, suggesting the execution of arbitrary commands. The large slack space in the OLE document is also anomalous. These indicators point towards an exploit attempting to gain code execution.

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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