Malicious RTF — malware analysis report

Static analysis result for SHA-256 1dbfb81366bd1c45…

MALICIOUS

RTF

91.1 KB First seen: 2021-04-01
MD5: 0283be4a5e630c404cf28db90c472d5f SHA-1: 8dc2aeb4d176ea7e5d899cee3e05d13559b6384b SHA-256: 1dbfb81366bd1c45c9aba67e130e91d2f07ed6766d8cfdd814c56c3c0f2ecb11
240 Risk Score

Heuristics 6

  • Equation Editor ProgID + OLE object high CVE related RTF_EQUATION_EDITOR
    RTF references Equation.3 ProgID alongside \objdata — likely Equation Editor (CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798) but without the binary CLSID payload, so flagged at HIGH instead of CRITICAL.
  • ClamAV: Rtf.Exploit.CVE_2018_0802-6624871-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6624871-1
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • \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_off00000227.bin rtf-objdata-decoded RTF \objdata at offset 0x227 9067 bytes
SHA-256: 82513c23f6a09931a429f380821a75afa8aab39fc0cb673edacfb6582f290097

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