Malicious RTF — malware analysis report

Static analysis result for SHA-256 d90e4d484b64c992…

MALICIOUS

RTF

486.5 KB Created: 2019-01-07 23:54:00 First seen: 2020-02-04
MD5: e71743c1906d87bc49c81a4222fe56c2 SHA-1: b1ba1f6ad74541d9e3f734479bb09fba55a7b5e6 SHA-256: d90e4d484b64c99266d16fe079d953e16d864250bad072e3eedbc99ecdc10486
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple embedded OLE objects, with one specifically identified as a 'Package' object class. The presence of \objupdate heuristics indicates an attempt to force OLE activation, suggesting the embedded objects are designed to execute malicious code upon opening. One extracted artifact, objdata_00_off0006f834.bin, is flagged for suspicious VBA auto-execution, further supporting the malicious intent.

Heuristics 6

  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • 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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 4 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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.microsoft.com/office/word/2003/wordml In RTF body
    • http://www.cmu.edu/blackboardIn RTF body
    • http://www.cmu.edu/blackboard/files/evaluate/tests-example.xlsIn RTF body
    • http://www.cmu.edu/blackboard/evaluate#manage_tests/import_questionscIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000024ac.bin rtf-objdata-decoded RTF \objdata at offset 0x24AC 73774 bytes
SHA-256: 9b3348039745bc83e57aa4bb6d663a3aa2327853da94c19eaef4495bb996cfa7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
objdata_03_off0006f834.bin rtf-objdata-decoded RTF \objdata at offset 0x6F834 6502 bytes
SHA-256: 4d78aaeea748a71dcb0130caf1f2c86d1f67ede8256319ad5cd481b642f10cad

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