Win.Trojan.RoyalCli

[O C via Snort-sigs <snort-sigs () lists snort org>]

Hi,

A pcap is available for the first rule. The second rule was created after searching for URL patterns associated with 
potentially linked domains as explained in the reference. The URL has a similar pattern, however, no pcap is available 
for it.

# --------------------
# Date: 2018-05-26
# Title: APT15 is alive and strong: An analysis of RoyalCli and RoyalDNS
# Tests: pcap, syntax only
# Reference: 
https://www.nccgroup.trust/uk/about-us/newsroom-and-events/blogs/2018/march/apt15-is-alive-and-strong-an-analysis-of-royalcli-and-royaldns/
#            RoyalCli: 
https://www.virustotal.com/#/file/6df9b712ff56009810c4000a0ad47e41b7a6183b69416251e060b5c80cd05785/detection
#            RoyalCli: 
https://www.virustotal.com/#/url/7685a7ea42c0c68adbb9c8ae1885441b814800a4777de1b93861fca0d6843f28/detection

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.RoyalCli outbound connection"; 
flow:to_server,established; urilen:>130; content:"GET"; http_method; content:"/Help.aspx?"; fast_pattern:only; 
http_uri; content:"&page="; http_uri; content:"&row="; http_uri; pcre:"/\x26page\x3d[A-Z]{56}\x26row\x3d[A-Z]{32}$/U"; 
metadata:ruleset community, service http; 
reference:url,www.nccgroup.trust/uk/about-us/newsroom-and-events/blogs/2018/march/apt15-is-alive-and-strong-an-analysis-of-royalcli-and-royaldns/;
 reference:url,www.virustotal.com/#/file/6df9b712ff56009810c4000a0ad47e41b7a6183b69416251e060b5c80cd05785/detection; 
classtype:trojan-activity; sid:8000063; rev:1;)

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.RoyalCli outbound connection"; 
flow:to_server,established; urilen:<110; content:"GET"; http_method; content:"/SearchX.aspx?"; fast_pattern:only; 
nocase; http_uri; content:"&MACHINE_NAME="; nocase; http_uri; metadata:ruleset community, service http; 
reference:url,www.nccgroup.trust/uk/about-us/newsroom-and-events/blogs/2018/march/apt15-is-alive-and-strong-an-analysis-of-royalcli-and-royaldns/;
 reference:url,www.virustotal.com/#/url/7685a7ea42c0c68adbb9c8ae1885441b814800a4777de1b93861fca0d6843f28/detection; 
classtype:trojan-activity; sid:8000064; rev:1;)

Thanks.

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