Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3ecd59389ea2d8de…

MALICIOUS

Office (OOXML)

11.4 KB Created: 2018-09-18 11:48:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2019-09-30
MD5: 4644737eec1b3f33acd8a5a1a644b762 SHA-1: 10610264a2ba225b35521c06c8981f97258d8c90 SHA-256: 3ecd59389ea2d8de55472b7bd719c9547e2248ae159d8b50a5e889c0f7cb2ca3
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample exhibits multiple high-severity heuristics related to external relationships and remote template injection, specifically targeting the URL http://tunjihost.ga/doc/fgee.doc. ClamAV identifies the file as a downloader, indicating its primary purpose is to fetch and execute a secondary payload. The presence of these indicators strongly suggests a malicious document designed for initial compromise via spearphishing.

Heuristics 5

  • ClamAV: Doc.Downloader.Redline-9972754-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Redline-9972754-0
  • OOXML external relationship targets a free/throwaway TLD high OOXML_EXTERNAL_REL_FREE_TLD
    Document has an external relationship whose target host is on a free, no-registration TLD (Freenom .ml/.ga/.cf/.gq/.tk). Legitimate business documents do not link out to a Freenom throwaway domain; these are a near-zero-FP phishing / BEC delivery tell (e.g. an RFQ/invoice lure pointing at 'shareddocuments.ml/RFQ'). The relationship may be a hyperlink, a remote template, or an external OLE object.
  • Remote template injection high OOXML_REMOTE_TEMPLATE
    Document references a remote template URL (http://tunjihost.ga/doc/fgee.doc) — 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 high OOXML_EXTERNAL_REL
    External target in word/_rels/webSettings.xml.rels: http://tunjihost.ga/doc/fgee.doc
  • 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://tunjihost.ga/doc/fgee.doc OOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn 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.microsoft.com/office/word/2010/wordprocessingDrawingIn 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/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

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