Malicious RTF — malware analysis report

Static analysis result for SHA-256 ca673cfd6c4d642a…

MALICIOUS

RTF

345.6 KB Authoring application: Riched20 6.3.9600 First seen: 2021-04-01
MD5: 48606b022073e842e138340f2c1bf659 SHA-1: 77cac656b5be5a2712cfe5a6f9a1b7c06c652779 SHA-256: ca673cfd6c4d642a5cf12574575ddd5f9b39ab7e2cf755257e0ef6978ae90c01
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 9067 bytes
SHA-256: 82513c23f6a09931a429f380821a75afa8aab39fc0cb673edacfb6582f290097

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