Malicious RTF — malware analysis report

Static analysis result for SHA-256 c8ee7811a2183218…

MALICIOUS

RTF

79.5 KB First seen: 2024-08-05
MD5: 1a9db080ee12ef6ff9d8eca0d47275f5 SHA-1: a37fe1872543b36c952d0a6e5d4f73d3280320cc SHA-256: c8ee7811a2183218343ee75f685a0a3f7df891687198d4c55601d5647d0922cc
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. This technique is commonly used to deliver a second-stage payload. The critical RTF_EQUATION_EDITOR heuristic firing strongly indicates exploitation of this known vulnerability.

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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000019f7.bin
8cd5e791ad08e02b8b7dd729bb70584e590a9428b750ea44a2c0b6712e40500a		 rtf-objdata-decoded RTF \objdata at offset 0x19F7 1611 bytes

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