Malicious RTF — malware analysis report

Static analysis result for SHA-256 bf36024cf58aa1c7…

MALICIOUS

RTF

56.5 KB
MD5: 218674cd5267ce55b100a5fdfb3970a7 SHA-1: d1e93ea659ef839ca5641c6753d4e53f75f47143 SHA-256: bf36024cf58aa1c76d60e8608d182e8c3326840b7d962e71524fed63840cd442
160 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that leverages a known vulnerability in Microsoft Equation Editor (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of the Equation Editor CLSID and the specific CVE firing strongly indicate exploitation for client 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_off00000118.bin
75dd61f7a0ed693d6c907e3db8f7b51994d98dda40ecc291d8ebb443db1ac17f		 rtf-objdata-decoded RTF \objdata at offset 0x118 3631 bytes

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