Malicious Office (OLE) / .DOCX — malware analysis report

Static analysis result for SHA-256 21ce55cd1e8c2ae5…

MALICIOUS

Office (OLE) / .DOCX

361.5 KB Created: 1998-01-14 02:58:00 Authoring application: Microsoft Word 9.0
MD5: 4adb4802f787a46d7d86ab15b81ea9ab SHA-1: fd1bc6cf04cc23a62e5c46982fd84277d3ba1d26 SHA-256: 21ce55cd1e8c2ae501221502e7c5cc86dc301fb3582b3e0f9894454ce0d42c5a
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample contains a Workbook_Open macro that attempts to copy itself to the Normal template and also to a file named 'Book1.' within the Excel startup path. It uses CreateObject and GetObject calls, indicative of malicious intent. The macro also attempts to modify registry keys related to Excel startup settings. The embedded URLs are likely related to the malware's command and control or payload delivery.

Heuristics 9

  • ClamAV: Doc.Trojan.Hopper-12 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Hopper-12
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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://www.sourceofkaos.com/homes/1nternal�
    • http://www.sourceofkaos.com/homes/1nternal

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d5d4cb3f6a6ef1f9112745db37d710ba8d0042bd0be75437fdde5d84a5f12d3c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6101 bytes
Detection
ClamAV: Doc.Trojan.Hopper-12
Obfuscation or payload: likely
Carved artifact contains 11 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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