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

Static analysis result for SHA-256 012315f853afe5d3…

MALICIOUS

Office (OLE) / .DOCX

160.3 KB Created: 2020-09-23 21:57:00 Authoring application: Microsoft Office Word
MD5: 3d020861ebc6b569b14313a0ceeaf700 SHA-1: 2c8c9b64ce93f6c23f9a88405b982679812a7ce9 SHA-256: 012315f853afe5d3fc90d06fc2e902dd1c0f29f6f53a01b6d9644331714d8a71
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1204.002 Malicious File

The sample is a Microsoft Office document containing a VBA macro that is automatically executed via the Document_Open subroutine. The macro utilizes CreateObject and appears to be heavily obfuscated, making it difficult to determine the exact payload. However, the presence of the Document_Open macro and the ClamAV detection as a downloader strongly suggests its purpose is to fetch and execute a secondary stage. The embedded URL, though benign, is noted.

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
d7dd2a73d7d39dc729b85cfde71706f8b2534ea5cd633d43e9c623fb8097a814		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 20294 bytes

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