Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2dec1c85bf49fc81…

MALICIOUS

Office (OLE)

213.5 KB Created: 2001-03-14 03:22:00 Authoring application: Microsoft Word 8.0
MD5: 14b1987b9229847102057726c82e6478 SHA-1: 4743bb7b9e9bf812ea6986d83e1688625b5ea976 SHA-256: 2dec1c85bf49fc813fbe11c35e0420dc3a7c464dee85384266c5f6f09b25310d
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file contains VBA macros and an embedded Equation Editor OLE object, indicating exploitation of a known vulnerability. ClamAV detections for 'Doc.Trojan.Marker-35' and 'Doc.Trojan.Marker-13' on the main file and an extracted artifact respectively, strongly suggest malicious intent. The Document_Open macro firing further supports the likelihood of automatic execution upon opening.

Heuristics 6

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
  • ClamAV: Doc.Trojan.Marker-35 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-35
  • 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.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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
5bbbe03e2900b1560f784bf27fe4e5546e0da24cb8f79ac2274837bab92903f7		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 29771 bytes
Detection
ClamAV: Doc.Trojan.Marker-13
Obfuscation or payload: likely
Carved artifact contains 8 Chr/ChrW string-construction calls.

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