Malicious RTF — malware analysis report

Static analysis result for SHA-256 99b2b53e414d55cf…

MALICIOUS

RTF

56.4 KB
MD5: c7c41e4fd5a30f8621c93578df274d37 SHA-1: 107d789aedf5fa2655398b8701705b02698c0ae6 SHA-256: 99b2b53e414d55cf64f0bf7ab9499a19213e895c733910f794cd009b6490c98d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object that exploits CVE-2017-11882 in the Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened. No specific family could be identified, but the exploit is a common method for initial code execution.

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_off00000107.bin
3b14c6e372195bcabea34b5e5ef752bb625e57beb75e807f521adbcfc410dedc		 rtf-objdata-decoded RTF \objdata at offset 0x107 3631 bytes

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