Malicious RTF — malware analysis report

Static analysis result for SHA-256 4718c9d11e3b8cdd…

MALICIOUS

RTF

111.7 KB First seen: 2021-09-16
MD5: 29def0cdd5ab665986fe92501a922e9c SHA-1: c73c744b3dcd89ad4c4706fd388f61613258591e SHA-256: 4718c9d11e3b8cddf4a2aaa1f48e57e0e652eab70c125e24e1f0f3e969d796d7
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

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

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_off0000009e.bin rtf-objdata-decoded RTF \objdata at offset 0x9E 3627 bytes
SHA-256: 5d2fede66a017b7e77d76299a823e2b47f173ae66ea06cc9778b34ad018bbb50

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