MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
The critical heuristic firing indicates the sample exploits CVE-2009-3129, a known vulnerability in Microsoft Excel's FEATHEADER record. This vulnerability allows for arbitrary code execution. The presence of a large slack space anomaly and an x86 GetPC stub further support the exploitation of a vulnerability for code execution. No specific family could be identified.
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=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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x86 GetPC stub (CALL $+5; POP EDI) high SC_GETPC_CALLx86 GetPC stub (CALL $+5; POP EDI)
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OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 188,298 bytes but its declared streams total only 24,565 bytes — 163,733 bytes (87%) 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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