Malicious RTF — malware analysis report

Static analysis result for SHA-256 4c5bb77a178f3dcb…

MALICIOUS

RTF

186.7 KB Authoring application: Riched20 6.3.9600 First seen: 2021-04-10
MD5: 4f34487db8d81b3daab7a6ba3d8ce2f4 SHA-1: 77d5061dd2ccce4080e68b8ff615b493e052a62a SHA-256: 4c5bb77a178f3dcbcbc80ff1ae0d877cec8b91cdedaccceab8f46b933984d1e7
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 13420 bytes
SHA-256: c7271a3c807e3e9bd69e00872f9de0202bccec72e3f99a9b76fba94aaa921457

Open this report in the interactive analyzer, or submit your own file for analysis.