Malicious RTF — malware analysis report

Static analysis result for SHA-256 2a916aa75ca07c1f…

MALICIOUS

RTF

19.3 KB First seen: 2023-03-13
MD5: 75e47bef04967ee0d4a88b5489aa6358 SHA-1: ef2686d75b48313205a436b67693bd753c33b30a SHA-256: 2a916aa75ca07c1f35bbb3dc77d64b3a184018c8f2f606802344bdb71847dc2f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious Link T1059 Command and Scripting Interpreter

The RTF file contains an embedded OLE object and specifically triggers the RTF_EQUATION_EDITOR heuristic, indicating a likely exploit targeting the Equation Editor component. The document body includes a lure instructing the user to 'Enable editing from the yellow bar above,' which is a common tactic to bypass security measures and activate embedded exploits. The presence of an OLE object and the lure strongly suggest an attempt to execute malicious code upon user interaction.

Heuristics 5

  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000032d2.bin
6b71b3e16faf896add4b17eb90dab3f3a3b86ecf40b66ba5c54c1bba44ca9cb0
rtf-objdata-decoded RTF \objdata at offset 0x32D2 1504 bytes