Malicious RTF — malware analysis report

Static analysis result for SHA-256 28235b26fa9c1cb1…

MALICIOUS

RTF

52.2 KB
MD5: 5f1579822dec4c532343b718039d52e6 SHA-1: 0abc2e85c8b92678d8f22a0022fc8856e0e9d880 SHA-256: 28235b26fa9c1cb1585d2521bfdc51de110fa80d6955dae7adf8c54edf417b5e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened, likely leading to the download and execution of a secondary payload. The presence of the Equation Editor CLSID and the specific CVE firing strongly indicate this attack vector.

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_off0000010d.bin
ddda8d47faaaf86324221716a310946671d50d29cb128345fe98409830eb6015		 rtf-objdata-decoded RTF \objdata at offset 0x10D 3631 bytes

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