Doc.Dropper.Agent — Office (OOXML) malware analysis

Static analysis result for SHA-256 befe20941b998128…

MALICIOUS

Office (OOXML)

1.43 MB Created: 2019-02-12 07:19:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2020-05-25
MD5: f87719c6faa712da2f774a111774513e SHA-1: 86945094395cd6d9c9ac6859a5015e0576a73769 SHA-256: befe20941b99812875a3b28e732fb5ff2d2b9d728f1da647214e9b08ecc87f1c
102 Risk Score

Malware Insights

Doc.Dropper.Agent · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Doc.Dropper.Agent. The OOXML_ALTCHUNK_OPAQUE heuristic indicates that the document imports unrecognised content from an external chunk, a common technique for dropper malware to hide its payload. This suggests the file is designed to download and execute a second-stage malicious payload.

Heuristics 3

  • ClamAV: Doc.Dropper.Agent-6427474-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6427474-0
  • altChunk imports unrecognised content high OOXML_ALTCHUNK_OPAQUE
    altChunk relationship resolves to a packaged part whose content does not match a known chunk format. Treat with suspicion — altChunk is rarely used outside RTF/HTML smuggling.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/pictureIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)

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