1/8/2023 0 Comments Wireshark filter ping![]() For example, if the attacker wants to create an SSH reverse shell (which enables the remote attacker to interact with the victim), the attacker can insert an SSH packet into the data section of the ICMP datagram that will establish the reverse shell. ICMP datagrams include a data section that can carry a payload of any size (see RFC 792). A datagram is similar to a packet, but datagrams do not require an established connection or confirmation that the transmission was received (unlike connection-based protocols like TCP). ICMP is a trusted protocol that helps administrators, so ICMP messages are often allowed to travel across firewalls and network segments that typically block inbound and outbound malicious traffic.ĭifferent types of malicious data can be inserted into an ICMP datagram, from small amounts of code to a large encapsulated HTTP, TCP, or SSH packet. The malware must establish a C2 tunnel from inside the network to communicate with the external attacker. Let's say a user downloaded malware or an attacker exploited a vulnerability to install malware on a victim device. Malicious data passing through the tunnel is hidden within normal-looking ICMP echo requests and echo responses. ![]() ![]() ICMP tunneling is a command-and-control (C2) attack technique that secretly passes malicious traffic through perimeter defenses. Learn how ICMP tunneling works, how to detect ICMP tunneling, and how to prevent these types of attacks. Unfortunately, this makes ICMP an appealing vector for attacks that can secretly transport commands and exfiltrate data through ICMP tunneling. ICMP is also capable of shuttling data between two systems. Except for ping and route tracing tools, users rarely interact with ICMP.īut ICMP is more than a diagnostic protocol. ICMP also offers a ping utility that can confirm healthy network connections. ![]() For example, when an IP packet is unable to reach its destination, a router sends an ICMP message about the issue-such as unreachable network destination or time exceeded-to the packet's original sender. ICMP is a network-level protocol that provides information about network transmission issues.
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