Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 9d66bb0ed455141b…

MALICIOUS

Office (OLE)

157.3 KB Created: 2020-09-14 23:20:00 Authoring application: Microsoft Office Word
MD5: bb64e1bc0b4dcf2dde586ab152259f45 SHA-1: 46c266874e713ee922394accfdfe01335ab0e7eb SHA-256: 9d66bb0ed455141bc8f94b6abb38dfe6e288ecba4e6863103841cccd5e87ddd3
300 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is identified as malicious by ClamAV with the signature Doc.Malware.Emotet-9762289-0. Static analysis revealed a Document_Open macro that utilizes CreateObject to execute an obfuscated PowerShell stager. This stager is designed to download and execute a second-stage payload, a common Emotet delivery technique. The PowerShell command is constructed by concatenating string literals, which when reconstructed, forms a command to execute encoded PowerShell.

Heuristics 8

  • Hidden UserForm PowerShell EncodedCommand stager critical OLE_USERFORM_OBFUSCATED_POWERSHELL
    OLE document contains a UTF-16LE form/property string with an obfuscated PowerShell -EncodedCommand payload. The observed macro family reconstructs this hidden string with Split/Join or UserForm property reads and launches it through WMI/COM process creation. This is downloader malware, not an Office CVE exploit.
  • ClamAV: Doc.Malware.Emotet-9762289-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emotet-9762289-0
  • 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
c2c6c828c036fac6100aee871b53e2578aa69d81979ea582439457589bcf0fbb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 18613 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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