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

Static analysis result for SHA-256 13b44fe04aec7fdc…

MALICIOUS

Office (OLE) / .DOC

161.6 KB Created: 2020-09-23 21:50:00 Authoring application: Microsoft Office Word
MD5: 826cfc7324eb02728bb3ab0a467ee6e5 SHA-1: 60dded91ee68304fc5409ca62288d6a46eb3ebc5 SHA-256: 13b44fe04aec7fdc7dce67de3a987317ad25ab9301110382847ca08bd645f2be
202 Risk Score

Malware Insights

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

The sample contains a VBA macro that is automatically executed upon opening the document, as indicated by the Document_Open and OLE_VBA_PCODE_AUTOEXEC_EXEC heuristics. The macro uses CreateObject to likely download and execute a second-stage payload. The ClamAV detection name 'Doc.Downloader.Mryv-9765643-0' further supports this behavior. The VBA code is heavily obfuscated, making it difficult to determine the exact download URL or payload.

Heuristics 6

  • ClamAV: Doc.Downloader.Mryv-9765643-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Mryv-9765643-0
  • 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
73025ddea320f2b071eb07bf918853ac1d6bc1ed1503c9c9400830c79e2af1db		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 19787 bytes

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