Gamaredon — Office (OOXML) malware analysis

Static analysis result for SHA-256 4b59d94c9a77c2b7…

MALICIOUS

Office (OOXML)

13.3 KB Created: 2021-07-27 11:31:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2021-09-27
MD5: d59ebb23880445442ff6aff677b62dec SHA-1: b964ffd558db21d4af13704ba9a0791d079c4ced SHA-256: 4b59d94c9a77c2b761658b07a1489fe34027173a5b44a00f711a97c7efabb212
122 Risk Score

Malware Insights

Gamaredon · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Doc.Downloader.Gamaredon-9966166-1, indicating it is a downloader associated with the Gamaredon group. Heuristics indicate the OOXML document attempts to inject a remote template from 'http://classroom.dangeti.ru/IRINA/source.dot', which is a common tactic for delivering secondary payloads. The document body content discusses price increases for various food products, which appears to be a lure to disguise the malicious intent.

Heuristics 4

  • ClamAV: Doc.Downloader.Gamaredon-9966166-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Gamaredon-9966166-1
  • Remote template injection high OOXML_REMOTE_TEMPLATE
    Document references a remote template URL (http://classroom.dangeti.ru/IRINA/source.dot) — 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/settings.xml.rels: http://classroom.dangeti.ru/IRINA/source.dot
  • 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://classroom.dangeti.ru/IRINA/source.dot Remote template reference
    • 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)

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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