Errors in Log

[spetrillo]

Hello all,

Should I concerned with these? Are these errors in the rules?

2020-05-16T14:43:17   suricata: [100299] <Notice> -- rule reload complete
2020-05-16T14:41:49   suricata: [100299] <Error> -- [ERRCODE: SC_ERR_INVALID_SIGNATURE(39)] - error parsing signature "alert smb any any -> $DC_SERVERS 445 (msg: "ATTACK AD [PTsecurity] Possible MS-RPRN abuse. Hash or Ticket theft"; flow: to_server, established, no_stream; content:"SMB"; offset: 5; depth: 3; content: "|05 00 00|"; distance: 0; content: "|41 00|"; distance: 19; within: 2; content: "|00 01 00 00|"; distance: 36; within: 4; content: "|5C 00 5C 00|"; fast_pattern; distance: 0; flowbits: isset, DCERPC.BIND.SPOOLSS; reference: url, posts.specterops.io/not-a-security-boundary-breaking-forest-trusts-cd125829518d; reference: url, github.com/ptresearch/AttackDetection; metadata: Open Ptsecurity.com ruleset; classtype: attempted-recon; sid: 10004153; rev: 1;)" from file /usr/local/etc/suricata/opnsense.rules/pt.research.rules at line 273
2020-05-16T14:41:49   suricata: [100299] <Error> -- [ERRCODE: SC_ERR_UNDEFINED_VAR(101)] - Variable "DC_SERVERS" is not defined in configuration file
2020-05-16T14:41:49   suricata: [100299] <Error> -- [ERRCODE: SC_ERR_INVALID_SIGNATURE(39)] - error parsing signature "alert tcp !$DC_SERVERS any -> $DC_SERVERS 389 (msg: "ATTACK [PTsecurity] DCShadow: Fake DC Creation"; flow: established, to_server; content: "|68 84 00|"; content: "CN="; distance: 5; within: 3; content: "CN=Servers,CN="; distance: 0; content: ",CN=Sites,CN=Configuration,DC="; distance: 0; content: "objectClass"; distance: 0; content: "server"; distance: 0; reference: url, blog.alsid.eu/dcshadow-explained-4510f52fc19d; classtype: attempted-admin; reference: url, github.com/ptresearch/AttackDetection; metadata: Open Ptsecurity.com ruleset; sid: 10002559; rev: 2; )" from file /usr/local/etc/suricata/opnsense.rules/pt.research.rules at line 215
2020-05-16T14:41:49   suricata: [100299] <Error> -- [ERRCODE: SC_ERR_UNDEFINED_VAR(101)] - Variable "DC_SERVERS" is not defined in configuration file
2020-05-16T14:41:49   suricata: [100299] <Error> -- [ERRCODE: SC_ERR_INVALID_SIGNATURE(39)] - error parsing signature "alert tcp !$DC_SERVERS any -> $DC_SERVERS [1024:] (msg: "ATTACK AD [PTsecurity] DCShadow Replication Attempt - DRSUAPI_REPLICA_ADD from non-DC"; flow: established, to_server, no_stream; content: "|05 00 00 03|"; depth: 4; content: "|05 00|"; distance: 18; within: 2; flowbits: isset, RPC.Bind.DRSUAPI; reference: url, blog.alsid.eu/dcshadow-explained-4510f52fc19d; classtype: attempted-admin; reference: url, github.com/ptresearch/AttackDetection; metadata: Open Ptsecurity.com ruleset; sid: 10002558; rev: 1; )" from file /usr/local/etc/suricata/opnsense.rules/pt.research.rules at line 213
2020-05-16T14:41:49   suricata: [100299] <Error> -- [ERRCODE: SC_ERR_UNDEFINED_VAR(101)] - Variable "DC_SERVERS" is not defined in configuration file
2020-05-16T14:41:49   suricata: [100299] <Error> -- [ERRCODE: SC_ERR_INVALID_SIGNATURE(39)] - error parsing signature "alert tcp !$DC_SERVERS any -> $DC_SERVERS [1024:] (msg: "ATTACK AD [PTsecurity] DCShadow Replication Attempt"; flow: established, to_server; content: "|05 00 0B|"; depth: 3; content: "|35 42 51 E3 06 4B D1 11 AB 04 00 C0 4F C2 DC D2|"; distance: 0; flowbits: set, RPC.Bind.DRSUAPI; flowbits: noalert; reference: url, blog.alsid.eu/dcshadow-explained-4510f52fc19d; classtype: attempted-admin; reference: url, github.com/ptresearch/AttackDetection; metadata: Open Ptsecurity.com ruleset; sid: 10002557; rev: 2; )" from file /usr/local/etc/suricata/opnsense.rules/pt.research.rules at line 211
2020-05-16T14:41:49   suricata: [100299] <Error> -- [ERRCODE: SC_ERR_UNDEFINED_VAR(101)] - Variable "DC_SERVERS" is not defined in configuration file
2020-05-16T14:41:49   suricata: [100299] <Error> -- [ERRCODE: SC_ERR_INVALID_SIGNATURE(39)] - error parsing signature "alert tcp $HOME_NET any -> $DC_SERVERS 88 (msg: "ATTACK [PTsecurity] Overpass the hash. Encryption downgrade activity to ARCFOUR-HMAC-MD5"; flow: no_stream, established, to_server; content: "|A1 03 02 01 05 A2 03 02 01 0A|"; offset: 12; depth: 10; content: "|A1 03 02 01 02|"; distance: 5; within: 6; content: "|A0 03 02 01 17|"; distance: 6; within: 6; content: "krbtgt"; distance: 0; xbits: set, Krb5.AsReq, track ip_src, expire: 10; classtype: attempted-user; reference: url, github.com/ptresearch/AttackDetection; metadata: Open Ptsecurity.com ruleset; sid: 10002228; rev: 1; )" from file /usr/local/etc/suricata/opnsense.rules/pt.research.rules at line 171
2020-05-16T14:41:49   suricata: [100299] <Error> -- [ERRCODE: SC_ERR_UNDEFINED_VAR(101)] - Variable "DC_SERVERS" is not defined in configuration file

Thanks,
Stefe