Formbook — Office (OOXML) malware analysis

Static analysis result for SHA-256 bf9efb6520cc0806…

MALICIOUS

Office (OOXML)

46.6 KB Created: 2014-09-02 10:49:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2015-10-01
MD5: c203ffa746c7eb141a1398dce60cb030 SHA-1: 20a8893727c6557d2cab0703b7ada9a9fa82e0bf SHA-256: bf9efb6520cc08068ae1343b2c581fc7f9113813e37d902f23ee488d5a84edfa
62 Risk Score

Malware Insights

Formbook · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a downloader for the Formbook malware family. While no specific malicious URLs or scripts were extracted, the detection signature strongly suggests the document's purpose is to download and execute a second-stage payload. This aligns with common tactics for delivering malware via spearphishing attachments.

Heuristics 2

  • ClamAV: Win.Exploit.Call4_Dword_Xor-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Exploit.Call4_Dword_Xor-1
  • 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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