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

Static analysis result for SHA-256 75876c4b8ebbac63…

MALICIOUS

Office (OLE) / .DOCX

157.0 KB Created: 2020-09-23 17:49:00 Authoring application: Microsoft Office Word
MD5: 19be7e7467ecf42b652e0efbf9a5c783 SHA-1: eee71965b6dc1d8b39d35b2ccdcd35520ab3df29 SHA-256: 75876c4b8ebbac638052c4f3fa36f23a3c95260b80ea6fc8f79eaca9eb520384
202 Risk Score

Malware Insights

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

The sample is a Microsoft Office document with a high-severity heuristic indicating the presence of VBA macros, specifically a Document_Open macro designed to execute code. The ClamAV detection as 'Doc.Downloader.Mryv-9765643-0' strongly suggests its purpose is to download additional malicious content. The VBA script itself is heavily obfuscated but the presence of `CreateObject` and the `Document_open` auto-execution routine are indicative of a downloader.

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
3fdc5dc9fa6dbe05ddbb5394ffbf1a5da353d311eafd75c86ddc522f2b658b58		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 19358 bytes

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