Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e73c823f8e41e853…

MALICIOUS

Office (OLE)

97.0 KB Created: 2002-09-16 19:24:00 Authoring application: Microsoft Word 8.0
MD5: eb157ce633eace7ba4181476af736d66 SHA-1: 046bc07f761b685c8ef19db3a8e351de75e6278e SHA-256: e73c823f8e41e853eb258452d3d52967b2c117b2483f0394d8d7ed213b15c3e6
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell

The file is an Office document containing VBA macros, as indicated by the OLE_VBA_MACROS heuristic. The critical OLE_VBA_SHELL heuristic suggests that the macros attempt to execute external commands. The embedded artifact 'macros.bas' and the ClamAV detections 'Doc.Trojan.Marker-31' and 'Doc.Trojan.Marker-1' further confirm the malicious nature of the file, likely acting as a downloader or dropper for other malware. The document body presents a letter of recommendation to encourage macro execution.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Marker-31 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-31
  • 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
f93396ef068dddd0e708d98e50c3b61cfadb1aaebc3beb424451fe5a963cb6e2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 22441 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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