Pingback C2 Detection
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/
Installation
The easiest way to install this package is through zkg:
## Usage
Use [this example PCAP](https://github.com/SpiderLabs/IOCs-IDPS/tree/master/Pingback) 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
```
## Additional References
- 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
## License
Copyright (c) 2021, Corelight, Inc. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
(1) Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
(2) Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
(3) Neither the name of Corelight nor the names of any contributors
may be used to endorse or promote products derived from this
software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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