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

Static analysis result for SHA-256 109faa9ffefc2e21…

MALICIOUS

Office (OLE) / .DOCX

161.6 KB Created: 2020-09-23 21:50:00 Authoring application: Microsoft Office Word
MD5: 03b22c472d514ae48eee43ff400eda59 SHA-1: 29345a4853804c366af76b46bb15c201276b90f1 SHA-256: 109faa9ffefc2e21ff1a72efcf3e665b4be5820282f07f8fa54c14bc9f243803
202 Risk Score

Malware Insights

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

The sample contains VBA macros, including a Document_Open auto-execution macro, which is a common technique for malware delivery. The ClamAV heuristic identifies it as a downloader. The VBA script appears to be heavily obfuscated, but the presence of CreateObject and the auto-execution macro strongly suggest it's designed to download and run a second-stage payload.

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
73025ddea320f2b071eb07bf918853ac1d6bc1ed1503c9c9400830c79e2af1db		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 19787 bytes

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