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

Static analysis result for SHA-256 5caf4fac63b40071…

MALICIOUS

Office (OLE) / .DOCX

258.1 KB Created: 2020-10-29 09:30:00 Authoring application: Microsoft Office Word
MD5: 62cf54a5c0ca3dc9b4c3140483786e5c SHA-1: 4b9f53249371ccd3254bcce9b9391811717a536f SHA-256: 5caf4fac63b4007116c090e6db0db81ad250d822e1fc251885c10d80d24b861e
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a Microsoft Office document containing VBA macros, specifically a Document_Open macro that uses CreateObject to execute code. The ClamAV heuristic identifies it as a downloader. The VBA script is heavily obfuscated but appears to be involved in string manipulation and potentially downloading a payload, as indicated by the CreateObject calls and the downloader heuristic. The embedded URL is benign, but the macro's behavior strongly suggests a downloader function.

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
2c8aded1cc33908777d3554a19067d8f93ed6d8269cc13dcdcff33eca45ebd5f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 18919 bytes

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