Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 6a110c4e0a0485d3…

MALICIOUS

Office (OLE)

230.5 KB Created: 2020-08-14 22:18:00 Authoring application: Microsoft Office Word
MD5: 443989ecabdb8ebeb0f66e745f565cbe SHA-1: 26a55c55f3bbed5631fe0a03bab8bf14612f7d27 SHA-256: 6a110c4e0a0485d364dfd47da1fb1ed565811c9df9c0376de4bfab2ebf63aa66
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains VBA macros, including a Document_Open macro and a hidden UserForm command stager, which are indicative of malware execution. The ClamAV detection explicitly identifies it as 'Doc.Downloader.Emotet-9343219-0', strongly suggesting the Emotet family. The macro's obfuscated nature and use of CreateObject point towards downloading and executing 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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