Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 139b25c226da47cd…

MALICIOUS

Office (OLE)

230.4 KB Created: 2020-08-14 22:18:00 Authoring application: Microsoft Office Word
MD5: c85b0511fde7f7814a55a32c8fc0c660 SHA-1: 8eda4e03dd7e516d6c82119cd7e05edb0c95d978 SHA-256: 139b25c226da47cd80b6946b6981a4bbfe6d2dfb5a558b26006ff779e41273f2
262 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 contains VBA macros, including a Document_Open macro and a hidden UserForm command stager, which are indicative of Emotet. The ClamAV signature further supports this family attribution. The macro's obfuscated nature and use of CreateObject suggest it is designed to download and execute a secondary payload.

Heuristics 7

  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • ClamAV: Doc.Downloader.Emotet-9343219-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9343219-0
  • 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
a41bede6b31c342f92c22747c23e2e7c6c77a42c803725a917c6179e5e099194		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8350 bytes

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