Malicious RTF — malware analysis report

Static analysis result for SHA-256 51ae46a8e32c3206…

MALICIOUS

RTF

53.7 KB
MD5: 748d898e8c72c55ed4dde5c252669f57 SHA-1: afb0eb4040ddde00091045c605ac9b7a69ff084d SHA-256: 51ae46a8e32c3206db8060b570785625211bc1fdfdd047b6e603290f95d4172d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

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. No document body or scripts were extracted, but the critical heuristics 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_off00000107.bin
86e9147e27e7b8568521c23a98937ff8545b13ebb5267d3bd0be33446bff8657		 rtf-objdata-decoded RTF \objdata at offset 0x107 3631 bytes

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