Malicious RTF — malware analysis report

Static analysis result for SHA-256 217fc55f06e3a3fc…

MALICIOUS

RTF

71.7 KB
MD5: 21479d8bb9d62bb05d64e5504cb8bd47 SHA-1: 72502d473c05312169b99fe8399c42ae98f9cc65 SHA-256: 217fc55f06e3a3fcfa4dd1e942f7daeecc2e5f07fe064d9dd95a10c75117a271
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that leverages a known vulnerability in Microsoft Equation Editor (CVE-2017-11882). This vulnerability allows for arbitrary code execution, which is the primary attack vector observed. No further stages or specific family indicators were identified.

Heuristics 4

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • 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_off0000010b.bin
c42281ab14d609a327fd45235a288f7813be5db73dcfd7d67d5bd95a1e0f2c2e		 rtf-objdata-decoded RTF \objdata at offset 0x10B 3631 bytes

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