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

Static analysis result for SHA-256 3aa4f27101991883…

MALICIOUS

Office (OLE) / .DOC

158.1 KB Created: 2020-09-17 16:56:00 Authoring application: Microsoft Office Word
MD5: dddb94c3dddaa41603665cef7a93f8ee SHA-1: fa0b40d1ce9b17942212057216d3b2f1aa47cf60 SHA-256: 3aa4f27101991883f1d5ff18ca7f7188bb0f473eaf17b1525c590b5c0296a2b7
240 Risk Score

Malware Insights

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

The sample contains VBA macros, specifically a Document_Open macro that utilizes CreateObject, indicating it's designed to execute code upon opening. The presence of a long encoded blob and ClamAV detection as a downloader suggests it's intended to fetch and run a secondary payload. No specific family could be identified, but the technique is common for initial access via malicious documents.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-9763026-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9763026-0
  • 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.
  • 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
d72f45ff27ad6de46c4e2f18d1cb6c13c4a0c6682629fccb5d0be1c4ab69db7a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 19870 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 20 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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