ET INFO Default PolarSSL/mbedTLS Certificate Issuer Observed in Certificate M2
Sourceet/open
CreatedJuly 24, 2025
UpdatedJuly 24, 2025
Classificationmisc-activity
alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Default PolarSSL/mbedTLS Certificate Issuer Observed in Certificate M2"; flow:established,to_client; tls.cert_issuer; bsize:35; content:"C=NL,O=PolarSSL,CN=PolarSSL Test CA"; fast_pattern; reference:url,os.mbed.com/teams/Arcola/code/mbedtls//file/bbdeda018a3c/tests/data_files/Readme-x509.txt/; reference:url,blog.sekoia.io/polaredge-unveiling-an-uncovered-iot-botnet/; classtype:misc-activity; sid:2063690; rev:1; metadata:affected_product IoT, attack_target IoT, created_at 2025_07_24, deployment Perimeter, performance_impact Significant, confidence High, signature_severity Informational, tag mbedTLS, tag PolarSSL, updated_at 2025_07_24;)
References
Metadata
affected productIoT
attack targetIoT
created at2025_07_24
deploymentPerimeter
performance impactSignificant
confidenceHigh
signature severityInformational
tagPolarSSL
updated at2025_07_24
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