Malicious RTF — malware analysis report

Static analysis result for SHA-256 489a0a62db70969e…

MALICIOUS

RTF

923.1 KB Created: 2019-01-07 23:54:00 First seen: 2019-08-04
MD5: faa688ecfc41d388de43f9aaed4e8d52 SHA-1: d7f3e87d85f00f3c94a1916afea5a064f25c56c3 SHA-256: 489a0a62db70969ed5fa64f4f3d0621be498ae78cc372ed9fda0274ed39a242c
162 Risk Score

Malware Insights

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

The RTF file contains multiple OLE objects, with specific heuristics indicating ".objupdate" forces OLE activation and a package object class. One extracted artifact, objdata_00_off00002458.bin, is flagged as a suspicious artifact with VBA auto-exec and execution terms, suggesting it's designed to run malicious code. The presence of OLE objects and the auto-execution flag strongly indicate an attempt to exploit vulnerabilities for client execution, likely delivered via spearphishing.

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 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 https://github.com/weareoutman/clockpicker/blob/master/LICENSE In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn 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
    • http://weareoutman.github.io/clockpicker/In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002458.bin rtf-objdata-decoded RTF \objdata at offset 0x2458 89134 bytes
SHA-256: 5a91160a1c68925e7d121ac5703fec2852de15507b66728d4ed5dd6e8b4fee89
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
objdata_05_off000dd8a5.bin rtf-objdata-decoded RTF \objdata at offset 0xDD8A5 4723 bytes
SHA-256: 639b121654077d4d5c038fce668c25799a7a20357600634475e88ce75ad8da35

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