MALICIOUS
100
Risk Score
Malware Insights
MITRE ATT&CK
T1204 Malicious File
T1204.002 Malicious File: Malicious Attachment
The sample is an Excel spreadsheet exhibiting a critical heuristic firing for CVE-2009-3129, indicating an exploit within the FEATHEADER record. Additionally, a high severity heuristic flags an OLE slack space anomaly, suggesting the presence of hidden or injected data. These indicators strongly suggest the file is designed to exploit this vulnerability upon opening, likely to download and execute 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 123,399 bytes but its declared streams total only 24,565 bytes — 98,834 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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