MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1204 Malicious File
T1204.002 Malicious File: User Execution
The sample is an Excel spreadsheet that triggers the CVE-2009-3129 vulnerability. This vulnerability allows for arbitrary code execution when the file is opened. The presence of a GetPC stub further indicates an attempt to execute shellcode. No specific family could be identified, and no further IOCs were extracted.
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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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 124,298 bytes but its declared streams total only 24,565 bytes — 99,733 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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