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

Static analysis result for SHA-256 155fc45f0849e7a8…

MALICIOUS

Office (OLE) / .DOCX

214.3 KB Created: 2020-09-21 07:35:00 Authoring application: Microsoft Office Word
MD5: cc820d63b8b3a12b6c1f1048877fc5cc SHA-1: 08e35ad57c6f4395c6fb8260b41a091192e2f5f2 SHA-256: 155fc45f0849e7a83587aedc0cb028a587bf371a518ceeebbd95492f5ee666dd
242 Risk Score

Malware Insights

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

The sample is a Microsoft Office document containing VBA macros, specifically triggering on the 'Document_open' event. Heuristics indicate the use of CreateObject and GetObject, common for executing downloaded payloads. The ClamAV detection as 'Doc.Downloader.Generic' further supports this. The VBA script itself is heavily obfuscated but the presence of a 'Document_open' macro and the generic downloader detection strongly suggest the intent is to download and execute a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-9764473-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9764473-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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
a72546be4835befa0cd5934bb3d180228dbaffbae6f31f70f11c03f05171f092		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 19249 bytes

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