MALICIOUS
100
Risk Score
Malware Insights
MITRE ATT&CK
T1204 Malicious Link
T1204.002 Malicious Link: Malicious File
The sample is an Excel OLE document exhibiting a significant slack space anomaly and a critical heuristic firing for CVE-2009-3129, indicating an exploit within the FEATHEADER record. This suggests the file is designed to leverage this vulnerability upon opening. While no document body or scripts were extracted, the exploit itself is the primary indicator of malicious intent, likely leading to the download or execution of a secondary payload.
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 210,981 bytes but its declared streams total only 24,565 bytes — 186,416 bytes (88%) 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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