Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 abacda0fc778a176…

MALICIOUS

Office (OLE)

102.1 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 47d6a19027736ca69d4d7ec1cba2f6ce SHA-1: 337cad3d5c351b4832b0edc2028439b14d1c9911 SHA-256: abacda0fc778a1765827b61cb0f3bf8894ffb7b3bf64851c47e3afa4ec18e991
180 Risk Score

Malware Insights

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

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