Malicious RTF — malware analysis report

Static analysis result for SHA-256 dff68b7818949e0c…

MALICIOUS

RTF

54.0 KB Authoring application: Riched20 6.3.9600 First seen: 2022-07-02
MD5: 7997a578f4cea8405bc09508e8816e59 SHA-1: 2b096bd23bd3e2d2b952c1384dd625e8a6bf3a19 SHA-256: dff68b7818949e0ccd6ac4e9620e2ccdd8ef8beb7114920edaf211f243bd6721
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 18210 bytes
SHA-256: 1ab4030566c6a7ef51f2e1fadab48e3fb7b2d0666864f8449daf307e3d526ac7

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