Malicious RTF — malware analysis report

Static analysis result for SHA-256 34760dd3bc9f5a5e…

MALICIOUS

RTF

112.1 KB First seen: 2024-10-09
MD5: 0ec3c5f0afb99af55c463cd57d7ea776 SHA-1: c8e0c437dbab0c82efa8bc71cb7cc5f165c2b813 SHA-256: 34760dd3bc9f5a5e235d6dd938b4104c6eb29712cc981145b48e45cb9d60615f
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains critical heuristics indicating the exploitation of the Equation Editor (RTF_EQUATION_EDITOR) and OLE object activation (RTF_OBJUPDATE). This suggests the file is designed to exploit a vulnerability, likely CVE-2017-11882, to execute arbitrary code. The embedded OLE object data is the likely carrier of the exploit payload.

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_off00001906.bin
9ca88b159385089e2ed9d804691f0e5200ef62310ef331a79e6c3856cad16197		 rtf-objdata-decoded RTF \objdata at offset 0x1906 2319 bytes

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