Emotet — Office (OLE) / .DOCX malware analysis

Static analysis result for SHA-256 74c87529363b4abf…

MALICIOUS

Office (OLE) / .DOCX

196.0 KB Created: 2020-10-21 19:03:00 Authoring application: Microsoft Office Word
MD5: 9ffad6461d62a9f16e67ee970eafcbf3 SHA-1: 7c5b384aa4e85a1ee8c853ecf6f580d469564995 SHA-256: 74c87529363b4abfb536c94df924723c6d3a0e119f4ed159c5fe95ab3e7d0349
202 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature 'Doc.Dropper.EmotetiBlueUpdate1020-9780531-0', indicating it functions as a dropper. Heuristics confirm the presence of VBA macros, specifically a 'Document_Open' auto-execution macro that uses 'CreateObject', a common technique for executing malicious code. The VBA script itself is heavily obfuscated, but its structure and the presence of 'CreateObject' strongly suggest it's designed to download and execute a secondary payload. The 'Spearphishing Attachment' technique is inferred due to the nature of macro-enabled documents.

Heuristics 6

  • ClamAV: Doc.Dropper.EmotetiBlueUpdate1020-9780531-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.EmotetiBlueUpdate1020-9780531-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
02a7c690f255f801ffb6158001004b72bc87e4e321bdb1878af07b39dba6d71b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 23233 bytes

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