Malicious RTF — malware analysis report

Static analysis result for SHA-256 3837b27e0f0a30df…

MALICIOUS

RTF

55.1 KB Authoring application: Riched20 6.3.9600 First seen: 2021-03-31
MD5: 6dad2d0f0c99612d0e18b76445787036 SHA-1: c32f064937f22276f1cd7b9cd6f760d264d2016e SHA-256: 3837b27e0f0a30dfb138f4817b01421f87bc88678d3806d95f55455ad162f7a4
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 18563 bytes
SHA-256: d1b6070075b03f34d3c73e0fb6eb10d9afbc0b1f7344683b9c29397ae9c59c0b

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