Win.Trojan.Agent-30444 — Office (OLE) malware analysis

Static analysis result for SHA-256 de5eb1739621076f…

MALICIOUS

Office (OLE)

122.0 KB Created: 2011-05-12 09:56:45 Authoring application: Microsoft Excel First seen: 2015-03-15
MD5: 1c2975ea5695b5b98d98983b24fb3b11 SHA-1: 040073498337e7212068c2a8e95b2f43415d0e04 SHA-256: de5eb1739621076f6e14e87c11ed28e652f735c0af5082329c001dd0d851f92f
140 Risk Score

Malware Insights

Win.Trojan.Agent-30444 · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file is identified as malicious by ClamAV with the signature Win.Trojan.Agent-30444. Static analysis revealed an OLE document with a large slack space and an appended executable payload, indicating it likely functions as a downloader or dropper for further malicious activity. The presence of an appended payload suggests an attempt to transfer and execute additional tools.

Heuristics 3

  • ClamAV: Win.Trojan.Agent-30444 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-30444
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 124,928 bytes but its declared streams total only 29,612 bytes — 95,316 bytes (76%) 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).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.

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