Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2f3b9934a1120fcb…

MALICIOUS

Office (OLE)

55.5 KB Created: 2003-01-29 17:07:00 Authoring application: Microsoft Word 9.0
MD5: c821d9bad4be1d5eebd90df005421163 SHA-1: 093c1c28e6fe1e34a33057d3fe5f0c0d9d8d148f SHA-256: 2f3b9934a1120fcbe92d5ee632b86517a5e3bb0b81707450e23a5f1b95bdb14d
240 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature 'Doc.Trojan.Marker-1'. Static analysis revealed VBA macros within the document, and a critical heuristic detected the use of the Shell() function. This indicates the macro is likely designed to execute arbitrary commands, potentially downloading and running a second-stage payload. The presence of the 'macros.bas' file further supports this. The document body content, a Material Safety Data Sheet, appears to be a lure.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Marker-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-1
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
cb4e40f0f7d6e81b7036ed4af8fe403e74ddcf7207d3e7bee85736df6c5aa44f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6312 bytes
Detection
ClamAV: Doc.Trojan.Marker-1
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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