Malicious RTF — malware analysis report

Static analysis result for SHA-256 a8ea5412dd9b5b0a…

MALICIOUS

RTF

55.2 KB Authoring application: Riched20 6.3.9600 First seen: 2021-03-31
MD5: c0c1fa4e639d8ee8613420cd51e39acd SHA-1: cc87c3d018432f10339436c84197a48b591b9087 SHA-256: a8ea5412dd9b5b0ab3501cad8fc37d2692dd99f308681f606d40422f7ea5d0a8
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 18605 bytes
SHA-256: fe1ae5114d6b02917a41aa219580aae1ea96ba9032e05946f6652e025d41ff66

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