Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 2f74b7099076365a…

MALICIOUS

Office (OLE)

231.8 KB Created: 2020-08-14 23:47:00 Authoring application: Microsoft Office Word
MD5: 5450a7bc81dd2f2005b5d870867e0ff0 SHA-1: edcb84b2a93f87ddbe859c42d50f5fc25044cba9 SHA-256: 2f74b7099076365ab12d0cff0c647a00e6e3598346fb113e7560cfa7d167d4bc
300 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1140 Deobfuscate or Obfuscate Malicious Code

The file is identified as malicious by ClamAV with the signature Doc.Downloader.Emotet-9349720-0. Static analysis revealed a critical heuristic firing for a VBA UserForm hidden-property command stager, indicating the presence of obfuscated code designed to execute commands. This mechanism, combined with the auto-execution of the Document_Open macro and the use of CreateObject, strongly suggests the script's intent is to download and execute a second-stage payload. The presence of VBA macros and the Emotet family attribution further support this conclusion.

Heuristics 8

  • 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-9349720-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9349720-0
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
c9e222625209724b824cd241f8d136260a3fd5171cd978940b3d275289318aae		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8071 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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