Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0354a324f328cb48…

MALICIOUS

Office (OOXML)

866.4 KB Created: 2019-09-27 05:17:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2020-05-25
MD5: ba39e27b6a0946ad0112ba493f713887 SHA-1: d41d797f3c6b9018af1de8bb69c095c269197bed SHA-256: 0354a324f328cb489f256e6366e3183920e6bac86fedec8f270addc3c86fff20
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV as 'Doc.Dropper.Agent'. The OOXML_ALTCHUNK_OPAQUE heuristic indicates that the document imports external content from 'word/afchunk2.docx', which is a common technique for dropper malware to hide its payload. The benign URLs extracted are standard XML namespaces and do not indicate malicious activity.

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/markup-compatibility/2006 In 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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