Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 a1ab7dee631d7906…

MALICIOUS

Office (OLE)

133.1 KB Created: 2019-10-23 12:53:00 Authoring application: Microsoft Office Word
MD5: 5f90652b5a5bbd2f553acbf361e40df8 SHA-1: 670e7d785ceba207f8d3fb4b8e6d277d72fe094c SHA-256: a1ab7dee631d7906b461cb49dd500ef7edae327fbec85eb1fbe40bd2b3a8f759
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains a critical heuristic firing for an obfuscated auto-exec VBA loader, specifically an AutoOpen macro that uses CreateObject to execute code. ClamAV also detected it as Doc.Downloader.Emotet. The VBA code is heavily obfuscated, making it difficult to determine the exact download URL or execution method, but the presence of AutoOpen and CreateObject strongly suggests it's designed to download and run a secondary payload. This aligns with the typical behavior of Emotet droppers.

Heuristics 7

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • ClamAV: Doc.Downloader.Emotet-7353645-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7353645-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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
63d648fdc9629ecf5c1604d43d2a3dfd392745a189d4d6769e3e2e4b42fe0b14		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 31154 bytes

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