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

Static analysis result for SHA-256 d040437bdc2a5c34…

MALICIOUS

Office (OLE) / .DOC

303.5 KB Created: 2021-11-29 08:01:00 Authoring application: Microsoft Office Word
MD5: fea600c8597e2b7931a9f6f781a2b43a SHA-1: eec64a5c8119268b5d13873747bc3f05c33dc6cb SHA-256: d040437bdc2a5c34ca7ffeb1f46f6adf82b6e5492748ec22b630a918b53a2b95
342 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic for Applications T1059.001 Command and Scripting Interpreter: PowerShell

The sample is a malicious Word document containing an AutoOpen macro that triggers execution upon opening. The VBA script is heavily obfuscated with junk comments and is truncated, making it full intent cannot be determined. However, the heuristic firings for Shell() and WScript.Shell usage indicate the intent to execute external system commands via the Windows Script Host.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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
5ff24e9f473be289d860de16f9b0e929f3c91c57d798c16a879b381e1ad6d27b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 132074 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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