MALICIOUS
160
Risk Score
Malware Insights
MITRE ATT&CK
T1204.002 Malicious File
T1566.001 Spearphishing Attachment
T1204 User Execution
The file is identified as malicious by ClamAV as Xls.Dropper.Agent-7056842-0. Static analysis revealed a critical vulnerability, CVE-2009-3129, related to an Excel FEATHEADER record overflow. Additionally, a large amount of slack space was detected in the OLE document, which is often used to hide malicious content. The combination of these factors strongly suggests the file is a dropper designed to exploit this vulnerability and deliver a secondary payload.
Heuristics 3
-
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.
-
ClamAV: Xls.Dropper.Agent-7056842-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Dropper.Agent-7056842-0
-
OLE document has large unaccounted-for region high OLE_SLACK_ANOMALYOLE file is 109,592 bytes but its declared streams total only 24,565 bytes — 85,027 bytes (78%) 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).
Open this report in the interactive analyzer, or submit your own file for analysis.