Malicious RTF — malware analysis report

Static analysis result for SHA-256 14f26ec6189b759d…

MALICIOUS

RTF

51.5 KB
MD5: 9ab1e3b27d17cba4a6e6bd8602cd2315 SHA-1: 5742fa403cf5ae1486ae8f73a88bc9a5a6bce76e SHA-256: 14f26ec6189b759de01f51b311effa75294c58a65742139d56e5c952025898a5
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 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 font record overflow pattern strongly indicate exploitation.

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_off0000010c.bin
9499dc877ad60b7d49f1b8ac161ba0c3c6203a54e1599c9d7a849f07a3485e41		 rtf-objdata-decoded RTF \objdata at offset 0x10C 3631 bytes

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