Malicious RTF — malware analysis report

Static analysis result for SHA-256 21119ce110e3fa31…

MALICIOUS

RTF

111.7 KB First seen: 2021-09-15
MD5: 591e80bd09331da7b12872c612a8862e SHA-1: c63920b3241d737c1e17f1b71d6660c3615df1cf SHA-256: 21119ce110e3fa3138fd482a3e3eb4374efa5d47e10826e9237e040345c44f27
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2017-11882 indicates that this RTF document is designed to exploit a known vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution, which is the primary attack vector observed. No other malicious indicators such as URLs or scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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_off000000c5.bin rtf-objdata-decoded RTF \objdata at offset 0xC5 3627 bytes
SHA-256: 5d2fede66a017b7e77d76299a823e2b47f173ae66ea06cc9778b34ad018bbb50

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