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

Static analysis result for SHA-256 0fe021634d1bf18c…

MALICIOUS

Office (OLE) / .DOCX

160.7 KB Created: 2020-09-17 22:23:00 Authoring application: Microsoft Office Word
MD5: 5f0efe6890d5b8996b302a0f19df77b1 SHA-1: 3557e587ff5a0791610c6851b93d35ebfb10283f SHA-256: 0fe021634d1bf18c9da5198d5627924f63245cd526211ade2e1670ab78e9518b
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample contains VBA macros, specifically a Document_Open macro, which is a common technique for executing malicious code upon document opening. The macro is designed to download and execute a second-stage payload, as indicated by the 'CreateObject' call and the 'Doc.Downloader.Generic' ClamAV detection. The VBA code itself is obfuscated, but the presence of the Document_Open auto-execution and the downloader heuristic strongly suggest this attack pattern.

Heuristics 6

  • ClamAV: Doc.Downloader.Generic-9763113-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9763113-0
  • 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
98a29bdf4abf669a96318f520c9bfe3aa10e950f57f7c585bdcdcff6e6ad90b2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 21952 bytes

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