Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 f821d9a95241b6f5…

MALICIOUS

Office (OLE)

182.4 KB Created: 2020-09-15 11:33:00 Authoring application: Microsoft Office Word
MD5: 4b238e9646d12cf70e9997f774baf75b SHA-1: 31d9daef90e43f948ab3f2a19ad485f418ef3497 SHA-256: f821d9a95241b6f5d1bb45ba001828945417d3dc229bb05c6cb72f3bc0306c45
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The critical ClamAV detection and high-severity heuristics for VBA macros, specifically the Document_Open auto-execution and CreateObject calls, strongly indicate a malicious macro dropper. The presence of a VBA macro in the 'macros.bas' file further supports this. The ClamAV signature 'Doc.Dropper.EmotetWinMob0920-9636503-0' directly attributes this sample to the Emotet family, which is known for downloading and executing further payloads.

Heuristics 7

  • ClamAV: Doc.Dropper.EmotetWinMob0920-9636503-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.EmotetWinMob0920-9636503-0
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
1b0a2e6dc108ed4842c981ae863863f03d8f9f4fda298d5feed7a2d71f08ba81		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 22489 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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