Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1b5d452e5ec005e1…

MALICIOUS

Office (OLE)

57.0 KB Created: 2008-09-10 18:29:00 Authoring application: Microsoft Word 11.3.8
MD5: c43583c3cef24903fafc3acdd39296f8 SHA-1: 83936237aaba9c7b4df6ce4ea97dc23899ff5aa8 SHA-256: 1b5d452e5ec005e1a42109c74273a51ce3452a0d8afbdebc22dc9d08b0e9e40a
240 Risk Score

Malware Insights

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

The sample is an OLE document containing VBA macros. A critical heuristic firing indicates the presence of a Shell() call within the VBA code, suggesting it attempts to execute a command. The embedded artifact 'macros.bas' is identified as a VBA macro, and ClamAV detections confirm this file is malicious, specifically as 'Doc.Trojan.Marker-5'. The macro likely downloads and executes a second-stage payload.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Marker-5 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-5
  • 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
ef882cd72b574f05a4dd5e0eb6ac529ea842d58a728b2bce1d3651b96f5cdca9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5517 bytes
Detection
ClamAV: Doc.Trojan.Marker-5
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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