Automation · API / MCP 中文

Technique note · T1568.003

DNS Calculation

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. An IP and/or port number calculation can be used to bypass egress filtering on a C2 channel. 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.

ATT&CK T1568.003 platforms — Status Active Version 20.1

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. An IP and/or port number calculation can be used to bypass egress filtering on a C2 channel.1 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.234

  1. Meyers Numbered Panda
  2. Meyers Numbered Panda
  3. Moran 2014
  4. Rapid7G20Espionage

Groups using this technique

GroupNameCountry
grp_g0005APT12—

Claims

No public claim points at this technique yet.

Auto-ingested and not human-reviewed; confidence and validity read by citation.