Emotet — Office (OLE) / .DOCX malware analysis

Static analysis result for SHA-256 748a109fc55c5d0d…

MALICIOUS

Office (OLE) / .DOCX

102.9 KB Created: 2020-09-29 17:52:00 Authoring application: Microsoft Office Word
MD5: 2b17def43c20d30df8068f769e0e4e03 SHA-1: a3a356d8b0c16bd7b26fdb0e23076161b4080e67 SHA-256: 748a109fc55c5d0dec25da9b91ecc76785ea1f1b2af565f4f442547dd9b28fd4
202 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The file is identified as malicious by ClamAV with the signature Doc.Downloader.Emotet-9769356-0. It contains a VBA macro that is automatically executed upon opening the document, as indicated by the 'Document_Open' macro and 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic. The macro uses 'CreateObject' and contains heavily obfuscated code, suggesting it is designed to download and execute a secondary payload. The presence of VBA macros and the Emotet family attribution strongly suggest a spearphishing attachment delivery method.

Heuristics 6

  • ClamAV: Doc.Downloader.Emotet-9769356-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9769356-0
  • 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
77f0fc2bd0d5c985be4d4cb3501afb191ffadc98be204ef2c40c091585c5d90a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10395 bytes

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