Malicious RTF — malware analysis report

Static analysis result for SHA-256 93ab5321afe95619…

MALICIOUS

RTF

659.2 KB Created: 2019-01-07 23:54:00 First seen: 2019-12-10
MD5: 3a3990aae995159f1c2d5771e995db93 SHA-1: 0e59a08601e7acd1605320cfbe81df95302c9246 SHA-256: 93ab5321afe956192b218a3babd09a5c074e4aa343215f1f748957bba93a0113
122 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. The presence of an \objupdate directive strongly suggests an attempt to automatically activate these embedded objects, which is a common technique for executing malicious payloads. While no specific family is identified, the method points to an exploit targeting OLE object handling.

Heuristics 5

  • \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
  • OLE object data medium RTF_OBJDATA
    RTF contains 5 \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_off0000244f.bin rtf-objdata-decoded RTF \objdata at offset 0x244F 77358 bytes
SHA-256: bb3c76ca28920c92485588c3996741e0e06927144717b85c14cc2ec797c32e43
objdata_04_off0009ab2f.bin rtf-objdata-decoded RTF \objdata at offset 0x9AB2F 6502 bytes
SHA-256: 4d78aaeea748a71dcb0130caf1f2c86d1f67ede8256319ad5cd481b642f10cad

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