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

Static analysis result for SHA-256 83f3a839921c2a2b…

MALICIOUS

Office (OLE) / .DOC

107.5 KB Created: 2020-11-26 15:10:00 Authoring application: Microsoft Office Word
MD5: 76ea85d21ba6c2bfff9ff70923cebc03 SHA-1: 36bbcc302df7abf85e57f2091b4c5214673f066e SHA-256: 83f3a839921c2a2b5cef864fcc1ece6f43b66c7f3ea1c72ba1d0c92bff0df33f
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is a malicious DOC file containing VBA macros. Critical heuristics indicate the use of WScript.Shell and a Shell() call within a Document_Open macro, suggesting the script's primary purpose is to execute arbitrary commands. This is further supported by the ClamAV detection for macro obfuscation. The embedded URLs are benign and do not appear to be related to the malicious functionality.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Macro.Obfuscation-9804250-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Macro.Obfuscation-9804250-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1e0525078890dc4f89cd17c1b926e27e510be6f91f5d1987b076db34ed9586c9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 16438 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 71 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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