Malicious RTF — malware analysis report

Static analysis result for SHA-256 c31ee1f58ec2b0a6…

MALICIOUS

RTF

317.8 KB Created: 2019-01-07 23:54:00 First seen: 2019-12-09
MD5: a757573938a4a607658a8cda53197f20 SHA-1: c34cfe8839b81728e12f48df713e414cd88e17cf SHA-256: c31ee1f58ec2b0a64d1831f81c6ea8244e92ad63da3c5fbf211e70014acb858c
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 2 \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_off0000246e.bin rtf-objdata-decoded RTF \objdata at offset 0x246E 135726 bytes
SHA-256: d2e40458852954a8f5e2b467b9bcb7dbe38dca510ffe2f64482a67d229e0bd3a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
objdata_01_off000455a7.bin rtf-objdata-decoded RTF \objdata at offset 0x455A7 6502 bytes
SHA-256: 4d78aaeea748a71dcb0130caf1f2c86d1f67ede8256319ad5cd481b642f10cad

Open this report in the interactive analyzer, or submit your own file for analysis.