Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 33ea8cc570fb2b8a…

MALICIOUS

RTF / .DOC

43.2 KB First seen: 2023-07-26
MD5: 3a5b27d89eee0fc187d722265defaadc SHA-1: e2bc008bf7669563806b67674e45005d691b0f62 SHA-256: 33ea8cc570fb2b8a1d0899bad3c57723a3ba950d9400a111270cca4e5b4f5081
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 Malicious File

The RTF document contains an embedded OLE object with an Equation Editor ProgID and an objupdate directive, indicating an attempt to exploit a known vulnerability. The document body includes a lure instructing the user to 'Enable editing', which is a common tactic for macro-based malware droppers to bypass security settings and trigger the exploit.

Heuristics 4

  • 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
  • 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_off000058d9.bin
b1474fb1d2057b9eeda75d53b94fe480db63b6170729caf713394319dfbbec91
rtf-objdata-decoded RTF \objdata at offset 0x58D9 1530 bytes