Malicious RTF — malware analysis report

Static analysis result for SHA-256 9f490deff6c96c5e…

MALICIOUS

RTF

51.0 KB
MD5: a59c96e595ab86f46e98254ed37fbe59 SHA-1: e42c738d28e785d8c618b972dd51c3c633c7409a SHA-256: 9f490deff6c96c5e572c45c41ba234fb35a2df2337ff317dbee4b4e066599d2a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

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, likely to download and run a secondary payload. The presence of OLE object data and specific Equation Editor CLSID firings strongly indicate this exploit.

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_off00000112.bin
d9d4d3d42505a77636df36440089cc36b25913d4b8252195b9a83a94c30fe88b		 rtf-objdata-decoded RTF \objdata at offset 0x112 3631 bytes

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