A Zeek package and Suricata rules for detection of ICMP ping tunnels created by the Pingback C2 tool.
Accompanying blog post: https://corelight.blog/2021/05/07/pingback-icmp-tunneling-malware/
The easiest way to install this package is through zkg:
zkg install corelight/pingback
Use this example PCAP and you can follow along below:
$ ls
Pingback_ICMP.pcapng
$ zeek -Cr Pingback_ICMP.pcapng pingback
$ cat notice.log
#separator \x09
#set_separator ,
#empty_field (empty)
#unset_field -
#path notice
#open 2021-05-07-14-43-48
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p fuid file_mime_type file_desc proto note msg sub src dst p n peer_descr actions suppress_for remote_location.country_code remote_location.region remote_location.city remote_location.latitude remote_location.longitude
#types time string addr port addr port string string string enum enum string string addr addr port count string set[enum] interval string string string double double
1619505583.332605 CH7l4D48kbE3nWo7M7 192.168.38.131 8 192.168.38.172 0 - - - icmp Pingback::Pingback_Tunnel An ICMP ping request message may have been Pingback C2 ref:trustwave.com/en-us/resources/blogs/spiderlabs-blog/backdoor-at-the-end-of-the-icmp-tunnel/ seq=53764 , |payload|=788 , icmp_info=[v6=F, itype=8, icode=0, len=788, ttl=64] , first 20 bytes of ICMP payload=shell\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00 192.168.38.131 192.168.38.172 0 - - Notice::ACTION_LOG 3600.000000 - - - - -
1619505583.333021 CH7l4D48kbE3nWo7M7 192.168.38.131 8 192.168.38.172 0 - - - icmp Pingback::Pingback_Tunnel An ICMP ping reply message may have been Pingback C2 ref:trustwave.com/en-us/resources/blogs/spiderlabs-blog/backdoor-at-the-end-of-the-icmp-tunnel/ seq=53764 , |payload|=788 , icmp_info=[v6=F, itype=0, icode=0, len=788, ttl=128] , first 20 bytes of ICMP payload=shell\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00 192.168.38.131 192.168.38.172 0 - - Notice::ACTION_LOG 3600.000000 - - - - -
#close 2021-05-07-14-43-48
- https://www.bleepingcomputer.com/news/security/new-windows-pingback-malware-uses-icmp-for-covert-communication/
- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/backdoor-at-the-end-of-the-icmp-tunnel/
- https://github.com/SpiderLabs/pingback
- https://www.virustotal.com/gui/file/e50943d9f361830502dcfdb00971cbee76877aa73665245427d817047523667f/detection
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