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

Static analysis result for SHA-256 613bf944597cf7f2…

MALICIOUS

Office (OLE) / .DOCX

240.8 KB Created: 2020-10-29 04:25:00 Authoring application: Microsoft Office Word
MD5: 0c0e705b373ea09f22106bae6996cf4e SHA-1: 860be8efa527c4b06cfd89bd67f5c7e06f14cdb2 SHA-256: 613bf944597cf7f2300dcd8a24394ca5de6c6f85ae7e41d98b2a3b4fe59b6779
202 Risk Score

Malware Insights

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

The sample is a Microsoft Word document containing VBA macros, specifically a Document_Open macro that uses CreateObject to execute code. The ClamAV detection 'Doc.Downloader.Generic-9785156-0' strongly suggests a downloader functionality. The VBA script appears to be obfuscated but contains string concatenation that likely forms a URL for downloading a secondary payload, which is a common technique for malware delivery.

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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