Emotet — Office (OLE) / .DOCX malware analysis

Static analysis result for SHA-256 71eb7b3776bb1678…

MALICIOUS

Office (OLE) / .DOCX

287.1 KB Created: 2020-10-29 11:27:00 Authoring application: Microsoft Office Word
MD5: c160033b9df4f6ae65930b45517c1882 SHA-1: f87fac626a239f0cb6bc71f33c8f13a4bd313f13 SHA-256: 71eb7b3776bb1678142bbf5db788ef2f6b687ddfb40b703857f5b89b1c82bd90
202 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV with a signature indicating it's a downloader, specifically 'Doc.Downloader.EmotetRed02224-9938637-0'. Static analysis reveals the presence of VBA macros, including a Document_Open auto-execution macro that utilizes CreateObject, a common technique for executing arbitrary code. The VBA script itself appears obfuscated but contains string concatenation that likely forms a URL or command for payload retrieval and execution, consistent with Emotet's behavior.

Heuristics 6

  • ClamAV: Doc.Downloader.EmotetRed02224-9938637-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02224-9938637-0
  • 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
898dac0a9fbba39aaf7a14ff7100c80bc81af6e0cb0f2cf6d397c84d46877d50		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 18710 bytes

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