Malicious RTF — malware analysis report

Static analysis result for SHA-256 51c42405ca7d7fb7…

MALICIOUS

RTF

230.5 KB Authoring application: Riched20 6.3.9600 First seen: 2021-04-10
MD5: 41a54e4f43f34a487175a862ca70751e SHA-1: fbcba846dffc986a896987accf62eb4312f6eef4 SHA-256: 51c42405ca7d7fb7c77d82ab2e9626ef8115fe34c08b7fa148c6f6f0e675a21e
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 16678 bytes
SHA-256: 819ff2c8e8c69195be65fe29f7b3e3c8b6eec0ccc01b1bb61d24df85a07bf9a7

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