MALICIOUS
100
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
The file is a malicious Microsoft Excel document identified as exploiting CVE-2009-3129. This vulnerability allows for arbitrary code execution when the file is opened. No document body or scripts were extracted, but the critical heuristic firing strongly indicates a vulnerability exploit.
Heuristics 2
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CVE-2009-3129 — Excel FEATHEADER record overflow critical CVE exact CVE_2009_3129Workbook BIFF stream contains a FEATHEADER (Feature Header) record with anomalous size (record_size=23, isf=2, cbHdrData=4294967295). 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.
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 58,432 bytes but its declared streams total only 24,565 bytes — 33,867 bytes (58%) 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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