Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 9cd52abe0d466748…

MALICIOUS

Office (OLE) / .DOC

113.5 KB Created: 2020-05-12 23:48:00 Authoring application: Microsoft Office Word
MD5: 129da2d3bdc6523cdb0caec8bc29f74d SHA-1: 7ad667c28c01fe2d7beed445efe1fffa814f19b6 SHA-256: 9cd52abe0d466748d44fe6aaeb9942dceffa88e88557f4fbebc74551f22ef9d8
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The file is a malicious OLE document containing VBA macros. Heuristics indicate the use of 'certutil' for downloading and decoding, and a 'CreateObject' call, suggesting the execution of external code. The presence of 'macros.bas' further supports this. The macros likely download and execute a second-stage payload, as indicated by the 'certutil' reference and the ClamAV detection signature 'Doc.Dropper.HexEncodedEXEHeader-9789587-1'.

Heuristics 7

  • ClamAV: Doc.Dropper.HexEncodedEXEHeader-9789587-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.HexEncodedEXEHeader-9789587-1
  • Reference to certutil (download/decode) high SC_STR_CERTUTIL
    Reference to certutil (download/decode)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ae42740acadced8878a7b0d2432fffc50c3d668c3bdc3fcf5e84c0a5e8e499d1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2740 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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