Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 16fa6c527c3f0efc…

MALICIOUS

Office (OOXML)

10.1 KB Created: 2018-03-07 09:39:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2021-10-07
MD5: 48373ef89b124356244e6ae8ba3882df SHA-1: c7166a85cfda728c7a9a125a81ce4a22b8ed856a SHA-256: 16fa6c527c3f0efc3e99dd60f1a909ca0ccd650bb4cd7906e7cffc2b772f5510
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains heuristics indicating remote template injection and external relationships pointing to the URL http://202.55.132.141/document/invoice.wbk. ClamAV identifies this as Doc.Downloader.Redline-9972754-0, suggesting it's a downloader. The presence of this URL strongly indicates the document's purpose is to fetch and execute a secondary payload, likely delivered via spearphishing.

Heuristics 4

  • ClamAV: Doc.Downloader.Redline-9972754-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Redline-9972754-0
  • Remote template injection high OOXML_REMOTE_TEMPLATE
    Document references a remote template URL (http://202.55.132.141/document/invoice.wbk) — a common remote-template-injection vector used by Hancitor, Emotet and many phishing campaigns. Word can fetch and apply the remote template; macros in that template may execute depending on Office policy and trust state.
  • External relationship medium OOXML_EXTERNAL_REL
    External target in word/_rels/webSettings.xml.rels: http://202.55.132.141/document/invoice.wbk
  • 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://202.55.132.141/document/invoice.wbk Remote template reference
    • 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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