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

Static analysis result for SHA-256 73361b83e1f4fcab…

MALICIOUS

Office (OLE) / .DOCX

241.4 KB Created: 2020-10-29 04:25:00 Authoring application: Microsoft Office Word
MD5: 10c2bd580c0b6668c4f1f4f27beff792 SHA-1: fc6364c19b8966111c44c2f7c483db556df6f36f SHA-256: 73361b83e1f4fcabefb9cc5fda88169aaf5e677c8804b85a6663faba9428391d
202 Risk Score

Malware Insights

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

The sample is a Microsoft Office document containing a high-confidence detection for VBA macros, specifically a Document_Open macro that uses CreateObject. The VBA script is heavily obfuscated but appears to be constructing a string that includes "][ 1) jjkgS [] []wro][ 1) jjkgS [] []w][ 1) jjkgS [] []wce][ 1) jjkgS [] []ws][ 1) jjkgS [] []ws][ 1) jjkgS [] []w". This suggests the macro's purpose is to download and execute a second-stage payload, consistent with a downloader malware.

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
6946a447d4e81b55f46842d89fcb86ebdb7dd8c4ce560afbdde9533734f99d67		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 18622 bytes

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