T1008: Fallback Channels
Adversaries may use fallback or alternate communication channels if the primary channel is compromised or inaccessible in order to maintain reliable command and control and to avoid data transfer thresholds.
Positive Technologies products that cover the technique
MaxPatrol SIEM knowledge base
mssql_database: PT-CR-560: MSSQL_dedicated_administrator_connection: An attempt to connect to a DBMS on a server via a Dedicated Administrator Connection (DAC)
Detection
ID | DS0029 | Data source and component | Network Traffic: Network Connection Creation | Description | Monitor for newly constructed network connections that may use fallback or alternate communication channels if the primary channel is compromised or inaccessible in order to maintain reliable command and control and to avoid data transfer thresholds. Processes utilizing the network that do not normally have network communication or have never been seen before may be suspicious. Note: Network Analysis frameworks such as Zeek can be used to capture, decode, and alert on TCP network connection creation. The below analytic is using an event ID from OSQuery. |
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ID | DS0029 | Data source and component | Network Traffic: Network Traffic Flow | Description | Monitor network data for uncommon data flows, such as unexpected surges or other abnormal inbound/outbound patterns. |
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Mitigation
ID | M1031 | Name | Network Intrusion Prevention | Description | Network intrusion detection and prevention systems that use network signatures to identify traffic for specific adversary malware can be used to mitigate activity at the network level. Signatures are often for unique indicators within protocols and may be based on the specific protocol used by a particular adversary or tool, and will likely be different across various malware families and versions. Adversaries will likely change tool C2 signatures over time or construct protocols in such a way as to avoid detection by common defensive tools. |
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