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

Static analysis result for SHA-256 479a5b1aac423a54…

MALICIOUS

Office (OLE) / .DOCX

215.5 KB Created: 2020-09-21 07:35:00 Authoring application: Microsoft Office Word
MD5: 9c35b1637daeb3bacfbe0c59256bf025 SHA-1: 02a75d64309a7779ad7f9bf03352c7ef04814c78 SHA-256: 479a5b1aac423a54a966aae4c4c0f4c48b789e3fba3575d352217f34b5c3f536
280 Risk Score

Malware Insights

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

The file is a DOCX document containing a large VBA macro. The 'Document_Open' macro is present and configured to execute automatically upon opening the document. This macro utilizes 'CreateObject' and 'GetObject' calls, indicating it attempts to run external code or manipulate system objects. The presence of 'macros.bas' and the ClamAV detection 'Doc.Downloader.Generic-9764473-0' strongly suggest this is a downloader malware.

Heuristics 8

  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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