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

Static analysis result for SHA-256 7c58cc9cf8936c71…

MALICIOUS

Office (OLE) / .DOCX

155.7 KB Created: 2020-09-23 17:49:00 Authoring application: Microsoft Office Word
MD5: 2318904f0bc71b963fce1d5c347393fd SHA-1: 2468bca18c1490d21264c9e6e2d3888e12de07b5 SHA-256: 7c58cc9cf8936c71f5078ce08031fe193791a9115468b3bc8724fc72888bb875
202 Risk Score

Malware Insights

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

The file is a Microsoft Office document containing VBA macros, specifically a Document_Open macro that is designed to execute automatically. Heuristics indicate the use of CreateObject and p-code execution, suggesting the macro's purpose is to download and execute a secondary payload. The ClamAV detection further supports its malicious nature as a downloader. No specific family could be identified, but the technique is consistent with spearphishing attachments.

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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