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

Static analysis result for SHA-256 74c188a6a2407cfd…

MALICIOUS

Office (OLE) / .DOCX

155.8 KB Created: 2020-09-23 17:49:00 Authoring application: Microsoft Office Word
MD5: e8a09cbaed4295ae66ff1c126ba339d6 SHA-1: 82560a72daec6796629e7148d90ff9aa42f9a178 SHA-256: 74c188a6a2407cfd58a3ed22700082c711aad351ae21221d885d26bfc790e19f
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 utilizes CreateObject. This indicates an attempt to execute malicious code upon opening. The ClamAV detection name 'Doc.Downloader.Mryv-9765643-0' strongly suggests the macro's purpose is to download and execute a secondary payload. The VBA code itself is heavily obfuscated, making a precise analysis of the download URL or execution method difficult, but the overall pattern is consistent with a downloader malware.

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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