Malicious RTF — malware analysis report

Static analysis result for SHA-256 143f2ecb9b98f12b…

MALICIOUS

RTF

102.0 KB First seen: 2024-08-07
MD5: 55130daded2878979be89640af795f74 SHA-1: ddcd4eb61b7a2eacd6065acf686ef9e62f1023c2 SHA-256: 143f2ecb9b98f12b928e70d2c2587f511c263f2d315836b08a3d89a4681da069
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains critical heuristics indicating the exploitation of the Equation Editor vulnerability (RTF_EQUATION_EDITOR) and uses OLE object data (RTF_OBJDATA) with an update trigger (RTF_OBJUPDATE) to force activation. This strongly suggests the file is designed to execute code, likely a downloader for a secondary stage. No specific family could be identified from the available evidence.

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_off00002058.bin
2bbb8b2d2a002944b23bda3a98a448bc842daff3e5a56e386b931080ca8b560f		 rtf-objdata-decoded RTF \objdata at offset 0x2058 2044 bytes

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