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

Static analysis result for SHA-256 17b8913da71ec65f…

MALICIOUS

Office (OLE) / .DOCX

165.3 KB Created: 2021-01-05 07:28:00 Authoring application: Microsoft Office Word
MD5: c3d47f6b173784addfa18f951a732fa3 SHA-1: a5afd37473de1679174341c3cdd2ee3b061aefff SHA-256: 17b8913da71ec65fdb142fcf094aebf599ed7bc7f86c01d049b23418c0c2df65
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a Document_Open VBA macro that executes obfuscated code. This code utilizes CreateObject to interact with the file system, attempting to create files with specific names and paths such as 'RscCHAX:\UQvUGOTC\RdisBAB.cwXobF' and 'PQnXau:\cdLsv\YicJPFQ.ClKuyu'. The presence of obfuscated auto-exec loaders and the use of CreateObject suggest a downloader or dropper functionality, likely aiming to stage further malicious activity.

Heuristics 7

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • ClamAV: Doc.Downloader.EmotetRed02224-9938637-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02224-9938637-0
  • 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
a19bea0b68e66c642d89ca357193de473f2db600ca0ce526dc79ce8aaabe41a9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10612 bytes

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