T1568.003 DNS Calculation Mappings

Adversaries may perform calculations on addresses returned in DNS results to determine which port and IP address to use for command and control, rather than relying on a predetermined port number or the actual returned IP address. A IP and/or port number calculation can be used to bypass egress filtering on a C2 channel.(Citation: Meyers Numbered Panda)

One implementation of DNS Calculation is to take the first three octets of an IP address in a DNS response and use those values to calculate the port for command and control traffic.(Citation: Meyers Numbered Panda)(Citation: Moran 2014)(Citation: Rapid7G20Espionage)



Capability ID Capability Description Mapping Type ATT&CK ID ATT&CK Name
action.malware.variety.C2 Command and control (C2) related-to T1568.003 Dynamic Resolution: DNS Calculation