Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0ecff4dd232de60f…

MALICIOUS

RTF / .DOC

56.0 KB First seen: 2023-09-13
MD5: ec204a2069af4c6d6e83487c1d1879bd SHA-1: af3cc9416ae7b759434d8529c70a564c2caf3f9f SHA-256: 0ecff4dd232de60facd0f0f303d65e72b1b5b308f53abb232d225d9b24ac55a3
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The file is an RTF document containing OLE object data and an Equation Editor exploit, as indicated by the RTF_OBJDATA, RTF_EQUATION_EDITOR, and RTF_OBJUPDATE heuristics. The document body contains text about financial audits and includes a lure to 'click Enable editing', suggesting it aims to exploit a vulnerability to execute a payload. The SE_ENABLE_LURE heuristic further supports the social engineering aspect.

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_off00003ba7.bin
5180f05e9505ce3156c6f27a6257b5aed06fa0c5b9818bc7cb6329c11a865d7a
rtf-objdata-decoded RTF \objdata at offset 0x3BA7 1572 bytes