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

Static analysis result for SHA-256 73d3fff5800c071f…

MALICIOUS

Office (OLE) / .DOCX

264.0 KB Created: 2020-10-28 13:40:00 Authoring application: Microsoft Office Word
MD5: be38cc083a3f0085a1ab8ef8d878230e SHA-1: 72e13d72ccb5052d44f41c7964e5a34a636a2cfd SHA-256: 73d3fff5800c071f5250a4aede30e51c32ffe2d5d963da3336c439c795e4233f
202 Risk Score

Malware Insights

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

The sample is a DOCX file containing VBA macros, including a Document_Open auto-execution macro. The macros utilize CreateObject and appear to perform string manipulation and replacement, as indicated by the `Replace` function and the obfuscated code. This behavior is consistent with a downloader or dropper attempting to disguise its payload or execution flow. The ClamAV detection further supports its malicious nature.

Heuristics 6

  • ClamAV: Doc.Downloader.Generic-9785156-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9785156-0
  • 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
04f0b14197f396c9b03f7b934599b1b01d62a486cd3090375b867094895917c9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 18531 bytes

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