Malicious RTF — malware analysis report

Static analysis result for SHA-256 8f526a0e9dffd6e4…

MALICIOUS

RTF

209.3 KB Authoring application: Riched20 6.3.9600 First seen: 2021-04-10
MD5: a57430e3929bbe98e370a2cc003ddbe0 SHA-1: 4d724cdea016eec675302946e2ff665217aaed8f SHA-256: 8f526a0e9dffd6e46a4ff3c183eb2a6d08c024268effc33b512e3bbbbcadfaaf
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 17031 bytes
SHA-256: 4ae6b762088642cb82f6950e9d5d38625636efa2ce920028a6730b763cbeb18e

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