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

Static analysis result for SHA-256 fd740d09fc266474…

MALICIOUS

Office (OLE) / .DOC

176.0 KB Created: 2022-03-22 11:38:00 Authoring application: Microsoft Office Word First seen: 2022-03-22
MD5: 4921c6b0a0b499389db3fe91e3aadcb5 SHA-1: 6d43efad8c6bce2ee61f75bc714bdfa7b71b513e SHA-256: fd740d09fc2664749a466e1269bc6cbd6b1a8c1880ca1589d91f3c3d8ccbd197
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell

The sample contains a VBA macro within the Document_Open subroutine. This macro utilizes WScript.Shell to execute commands, indicated by the critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristic firings. The script's intent is to leverage WScript.Shell to download and execute a secondary payload, as evidenced by the use of CreateObject("WScript.Shell").

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
  • 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
422504a964bd75b16c9640213f6d3b0ccd9f041b00f905097a9899c16fc1ac64		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 18353 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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