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

Static analysis result for SHA-256 ed493db03ed0a43e…

MALICIOUS

Office (OLE) / .DOC

69.0 KB Created: 2021-09-13 11:25:00 Authoring application: Microsoft Office Word
MD5: b71faa6a57e89d8bcef58440db967acb SHA-1: 6566b0a9652527c4ae729e2b14cf34f84527ade7 SHA-256: ed493db03ed0a43ee059026fadbfccb26cde4b3d71610073e09adcaa173a6c1f
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1140 Deobfuscate/Decode Files or Information

The sample is a malicious Word document containing VBA macros. The 'document_open' macro is triggered upon opening the document, which then executes a VBA function 'XR'. This function writes the document's text content to a file named 'exta' in the current directory. Subsequently, another function 'caDtEx' uses WshShell to execute 'explorer exta', effectively launching the saved content with Windows Explorer. This indicates a likely attempt to deliver malicious content or exploit a vulnerability through the executed file. The ClamAV detection further supports its malicious nature.

Heuristics 6

  • ClamAV: Doc.Malware.Valyria-10009252-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10009252-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e5a7b5280990f6cfbe38e2ac0f92ac784a8284ded0595bb19d461a3507fdb943		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 683 bytes

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