Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b147986b91c06ad8…

MALICIOUS

Office (OLE)

74.0 KB Created: 2006-08-16 02:30:00 Authoring application: Microsoft Word 9.0
MD5: 4e35fee1babed851f7a7c3c5f2713bee SHA-1: ffc1c6d9535747980d173c96e71774297bd02696 SHA-256: b147986b91c06ad8f141a9df8c6c434d88c194d8b2bb97c162cd90a3b70aa2a3
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is identified as malicious by ClamAV with multiple high and critical heuristic firings, including the presence of VBA macros and specifically an AutoOpen macro. The document body, while appearing to be a business process definition, is likely a lure to disguise the malicious intent of the embedded VBA macros. The macros are designed to execute malicious code, as indicated by the 'Win.Trojan.W97M-9' and 'Doc.Trojan.Class-15' detections on the file and an extracted artifact.

Heuristics 6

  • ClamAV: Win.Trojan.W97M-9 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.W97M-9
  • 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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • 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
77e2c49f72eaf2d918c367b892008a1eda7c71950c1c12d6a478660f4d2bef54		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8137 bytes
Detection
ClamAV: Doc.Trojan.Class-15
Obfuscation or payload: likely
Carved artifact contains 43 Chr/ChrW string-construction calls.

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