Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 84cddf45b37e0ccf…

MALICIOUS

Office (OLE)

106.5 KB Created: 2004-01-19 11:54:52 Authoring application: Microsoft Excel First seen: 2016-07-20
MD5: f18ea2ea5e2aa6371c1133fafafb8184 SHA-1: 84d7bd077dbb603084c843b83d4287bb3ef2def4 SHA-256: 84cddf45b37e0ccfecc90754339ebbee1ba88022134865b289ff816a74d4691d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is identified as malicious by ClamAV with the signature 'Doc.Dropper.Yawn-6922876-0'. A heuristic firing indicates the presence of VBA p-code auto-execution with execution tokens, specifically 'ExecuteExcel4Macro', suggesting an attempt to run embedded code. Although VBA macros could not be fully extracted due to an unsupported Office format, the combination of these indicators points to a dropper or downloader functionality disguised within a document.

Heuristics 3

  • ClamAV: Doc.Dropper.Yawn-6922876-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Yawn-6922876-0
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Unsupported Office format for VBA extraction info OFFICE_FORMAT_UNSUPPORTED
    olevba could not extract VBA macros (TypeError); format-agnostic byte-level scans still ran. Likely legacy, encrypted, or malformed OLE/OOXML — re-scanning the same bytes will yield the same outcome.

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