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

Static analysis result for SHA-256 5a516d9120e33f97…

MALICIOUS

Office (OLE) / .DOCX

206.9 KB Created: 2020-10-28 18:42:00 Authoring application: Microsoft Office Word
MD5: ac0cf7735e60137bc07f3e38902d6723 SHA-1: 3d8c22f0f50de53c9d85f6464502494421cc21af SHA-256: 5a516d9120e33f97f6d4301174951b6c183cbb5bcb6b9b150fdead496a9c9d6a
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is a Microsoft Office document containing VBA macros, specifically a Document_Open auto-execution macro. The macro utilizes CreateObject to likely download and execute a second-stage payload, as indicated by the ClamAV detection 'Doc.Downloader.Generic-9785156-0'. The obfuscated VBA script itself does not reveal specific URLs or commands, but its structure and heuristic firings strongly suggest a downloader functionality.

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
e949db65d47346cd391eb9bc49c66a713688cfea31c7cb788a6d1dce1ea9efc6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 18584 bytes

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