Malicious RTF — malware analysis report

Static analysis result for SHA-256 df0ab48728abcac9…

MALICIOUS

RTF

64.1 KB First seen: 2021-03-31
MD5: c0e4606508b86f37dbbf1c4fb02f8878 SHA-1: fb967761943e58b262ae048b9541ecd575b3c8a5 SHA-256: df0ab48728abcac9ba76db3ddf4dc0c289c46b3db6927f6d4ef8a5fbf216bc20
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_off00001ce2.bin rtf-objdata-decoded RTF \objdata at offset 0x1CE2 17173 bytes
SHA-256: 1b01d6a5f7459ae9f4cfc9656fc4f0dcecd555ce01d1729e0db2c610652593f5

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