Malicious RTF — malware analysis report

Static analysis result for SHA-256 18d7cbca7d8b6a04…

MALICIOUS

RTF

84.5 KB
MD5: 61b211906dfd28d5bbe6724e50c3bb20 SHA-1: 84354e4cbfc989c37c46f848622175e54f31eccf SHA-256: 18d7cbca7d8b6a0491b2c3a6d0914cc0603ee5152014e28d4b9c63da500aaa99
200 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 the Equation Editor (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code upon activation of the object, likely leading to a second-stage payload download or execution.

Heuristics 5

  • 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
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • 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_off0000009f.bin
345ddca0c1b878737e635ebae56edbab7609d9b242707676a4c2c105f93a6e00		 rtf-objdata-decoded RTF \objdata at offset 0x9F 27187 bytes

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