Malicious RTF — malware analysis report

Static analysis result for SHA-256 856d19b1d492850d…

MALICIOUS

RTF

54.9 KB Authoring application: Riched20 6.3.9600 First seen: 2022-07-02
MD5: 75f6cd531ea9071be7461866ceeabb59 SHA-1: 769283dcf379e42501338b93019e80c0c086d82e SHA-256: 856d19b1d492850dbabd1962d332790e7a3b7c68259fba55461d2812ec32d823
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_off000000fe.bin rtf-objdata-decoded RTF \objdata at offset 0xFE 18499 bytes
SHA-256: f97ff643051eabd9939d2dcb752cd90a5a5fcbd387912bf077033c500d0e0c6d

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