MALICIOUS
100
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
The sample is an Excel file exhibiting a significant amount of slack space, indicative of potential obfuscation or embedded malicious content. Crucially, it triggers a critical heuristic for CVE-2009-3129, a known vulnerability in Excel related to FEATHEADER record overflow. This strongly suggests the file is designed to exploit this vulnerability for arbitrary code execution.
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=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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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 121,863 bytes but its declared streams total only 24,565 bytes — 97,298 bytes (80%) 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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