Xls.Dropper.Agent-7086030-0 — Office (OLE) / .CC malware analysis

Static analysis result for SHA-256 7f26901a6a2633e3…

MALICIOUS

Office (OLE) / .CC

60.0 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 392aec7f07f8d50052a5676690e0eba4 SHA-1: 96d37b9e2bc950552a136874b4954cccee42d296 SHA-256: 7f26901a6a2633e3b6228ece964a9ea1abab76a6a4a23b4261f4832468732390
160 Risk Score

Malware Insights

Xls.Dropper.Agent-7086030-0 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV with the signature Xls.Dropper.Agent-7086030-0. Static analysis revealed a critical vulnerability, CVE-2009-3129, which is an Excel FEATHEADER record overflow. This vulnerability allows for the execution of arbitrary code, indicating a dropper functionality.

Heuristics 3

  • CVE-2009-3129 — Excel FEATHEADER record overflow critical CVE exact CVE_2009_3129
    Workbook BIFF stream contains a FEATHEADER (Feature Header) record with anomalous size (record_size=23, isf=2, cbHdrData=4294967295). 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-7086030-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7086030-0
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 61,440 bytes but its declared streams total only 24,565 bytes — 36,875 bytes (60%) 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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