MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1204.002 Malicious File: Malicious File
The critical heuristic firing for CVE-2009-3129 indicates that this Excel file contains a record overflow vulnerability. This, combined with the high heuristic for WinExec, strongly suggests the file is designed to exploit this vulnerability to execute arbitrary code. The large slack space in the OLE document is also a common characteristic of malicious Office documents.
Heuristics 3
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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=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.
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Reference to WinExec API high SC_STR_WINEXECReference to WinExec API
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 60,554 bytes but its declared streams total only 24,565 bytes — 35,989 bytes (59%) 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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