Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7210c2c4c21bfe70…

MALICIOUS

Office (OLE)

61.5 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 7e25d890450059c2a86a3f72e4bd72b3 SHA-1: 25e14e520f2e14adfd6dba8131d212d83025c207 SHA-256: 7210c2c4c21bfe703efe1506a39cd28cde45732d427285710850f4080c0c7d0f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is a Microsoft Excel document that triggers a critical heuristic for CVE-2009-3129, indicating an exploitation of a record overflow vulnerability. This vulnerability allows for arbitrary code execution on the victim's machine. No document body or scripts were extracted, but the exploit itself is sufficient evidence of malicious intent.

Heuristics 2

  • 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 62,982 bytes but its declared streams total only 24,565 bytes — 38,417 bytes (61%) 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).

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