MALICIOUS
100
Risk Score
Malware Insights
MITRE ATT&CK
T1204.002 Malicious File
T1566.001 Spearphishing Attachment
The sample is an Excel file exhibiting a critical heuristic firing for CVE-2009-3129, indicating an exploit within the FEATHEADER record. This vulnerability is commonly used to execute arbitrary code. The large slack space anomaly further suggests potential obfuscation or embedded malicious content. The file is therefore likely used as a delivery mechanism for a malicious payload via a targeted attack.
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 157,208 bytes but its declared streams total only 24,565 bytes — 132,643 bytes (84%) 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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