Malicious RTF — malware analysis report

Static analysis result for SHA-256 f3229304529dd99b…

MALICIOUS

RTF

231.7 KB Authoring application: Riched20 6.3.9600 First seen: 2021-04-10
MD5: 2bd27c4dd6b12f725de0e844055c5a0c SHA-1: 0c12f7a70fcacee1e20dd9706885e69f833118f0 SHA-256: f3229304529dd99bc3cb416928fb6e281ad8e21d7759fc2dae0c61b262891d22
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_off00000100.bin rtf-objdata-decoded RTF \objdata at offset 0x100 11598 bytes
SHA-256: 1f41529d26ba7175b615e8bb9c7fd78c251e48655b2e87ff38104956abadf915

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