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

Static analysis result for SHA-256 c9ab3c4481da9534…

MALICIOUS

Office (OLE) / .DOC

35.5 KB Created: 2017-10-17 02:08:00 Authoring application: Microsoft Office Word
MD5: 90f57a9578ce153c8520aee9b42d0407 SHA-1: b669b63e818628044a49c33a2c4edb9840bb030e SHA-256: c9ab3c4481da95348f1d65fecb8da349ecdb1826f16d27ee3e5c5a0d49384c52
340 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. The 'Document_Open' macro triggers a 'Shell()' call, which is a critical finding. This indicates the macro is designed to execute arbitrary commands, likely to download and execute a second-stage payload. The presence of 'WScript.Shell' usage further supports this. No specific family could be identified, but the technique is common for initial access.

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
42d43be0f963684f8a1a5276cfadaff7052a1a0604c9361e5f4a01b9fd94770f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6827 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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