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

Static analysis result for SHA-256 3000b45d24d2f958…

MALICIOUS

Office (OLE) / .XLS

102.1 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 9b60af61854a4334967377c0d19a4af4 SHA-1: 76bfe49dc804e33860d82f8c94c25dce235a6309 SHA-256: 3000b45d24d2f958efbba838c27c5dc7e110b0ecd53aa772a46e7c2a0093263b
240 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.003 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. Additionally, a suspicious invocation of cmd.exe with an execution flag was observed, suggesting the execution of malicious commands. The large slack space in the OLE structure is also anomalous. These indicators collectively point to an exploit attempting to gain code execution.

Heuristics 6

  • 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.
  • ClamAV: Win.Trojan.Agent-30152 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-30152
  • 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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