Malicious RTF — malware analysis report

Static analysis result for SHA-256 9793791e22418398…

MALICIOUS

RTF

60.8 KB
MD5: 9ed1ec6bfef3f5e4ac3acefb52478116 SHA-1: a3473489d9ae735768e36b1b27504b990c38ba94 SHA-256: 9793791e224183984f555f24730c919a84fdc2fb35da7a12e579070c10a6b1cf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object that triggers a critical vulnerability in Microsoft Equation Editor (CVE-2017-11882). This exploit allows for arbitrary code execution, likely to download and run a secondary payload. No document body or scripts were extracted, but the critical heuristic firings 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_off00000111.bin
672862c27f8cb741235410e0f69cc3a21246aa24773e4d41d19e7a3c45bc71bb		 rtf-objdata-decoded RTF \objdata at offset 0x111 3631 bytes

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