Greetings,
It looks to me like the CBC is implied. After looking the cipher up online and doing a quick connection test, CBC was listed in the cipher suite. From my test session capture:
Session ID Length: 32
Session ID: 32e83402862ca8e61ab05c0bee75506daf4782b2fa83fe56...
Cipher Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)
Compression Method: null (0)
Using:
tmm --clientciphers DEFAULT | grep -i ecdh | grep -i sha384
34: 49192 ECDHE-RSA-AES256-SHA384 256 TLS1.2 Native AES SHA384 ECDHE_RSA
You could test on your end just to be sure 😃
Kevin