Block Signal with "Layer 7" or "Content" or "TLS" - MikroTik Script RouterOS
How to Block Signal with "Layer 7" or "Content" or "TLS"

Block Signal With "Layer-7"

/ip firewall layer7-protocol
add name=Signal regexp="^.+(signal.com|whispersystems.com).*\$"
/ip firewall filter
add action=drop chain=forward layer7-protocol=Signal

Block Signal With "Content"

/ip firewall filter
add action=drop chain=forward content="signal.com" 
add action=drop chain=forward content=".signal."
add action=drop chain=forward content="whispersystems.com" 
add action=drop chain=forward content=".whispersystems."

Block Signal With "TLS"

/ip firewall filter
add action=drop chain=forward protocol=tcp tls-host="signal.com"
add action=drop chain=forward protocol=tcp tls-host="*.signal.*"
add action=drop chain=forward protocol=tcp tls-host="whispersystems.com"
add action=drop chain=forward protocol=tcp tls-host="*.whispersystems.*"