Malicious RTF — malware analysis report

Static analysis result for SHA-256 d2c55cf8c85e67d6…

MALICIOUS

RTF

1.35 MB Created: 2019-01-07 23:54:00 First seen: 2019-11-20
MD5: 26adbf3d3692e92aaf30900058aacac6 SHA-1: 6ceea2c7fbe630e8f2295b970de655c8cfb49c89 SHA-256: d2c55cf8c85e67d6698e978dcef557800c158d4d4a49f2471fae767f49d7bc94
202 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 object exhibiting excessive hex-encoded data indicative of a hidden payload. The ".bin" artifacts extracted from these objects are likely the malicious payload. The presence of ".bin" files and the high-severity heuristics related to OLE object manipulation strongly suggest an attempt to execute arbitrary code.

Heuristics 7

  • \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
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1090KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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 6 \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: f3b61eb4969cd8a884d8bb9543e32f010e447635de4dd75dff59df6f67827d07
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
objdata_05_off0014fd47.bin rtf-objdata-decoded RTF \objdata at offset 0x14FD47 6502 bytes
SHA-256: 4d78aaeea748a71dcb0130caf1f2c86d1f67ede8256319ad5cd481b642f10cad

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