Malicious RTF — malware analysis report

Static analysis result for SHA-256 3be5e3a9f03a19bf…

MALICIOUS

RTF

41.4 KB First seen: 2024-08-01
MD5: 887ae3393ddd6e2fe7005793c1e52322 SHA-1: 406ec5c082cbae592941aa8698d70d96f017f63a SHA-256: 3be5e3a9f03a19bf5b28a8fa080ddd5f50d364bb7d78836b5b83c4a6cc4f2c0e
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and specifically triggers the Equation Editor vulnerability, indicated by the RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics. This suggests the file is designed to exploit CVE-2017-11882 to achieve code execution. The embedded OLE object, objdata_00_off000013d7.bin, is the likely payload carrier.

Heuristics 3

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000013d7.bin
96e186b03e39a3182aeca341c18767e42f784db2db904e9592ea8e0a6043bf6e		 rtf-objdata-decoded RTF \objdata at offset 0x13D7 1694 bytes

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