[Snort-sigs] Osx.Trojan.OceanLotus variant

Y M snort at outlook.com
Tue May 1 09:12:30 EDT 2018


Hi,

Below rules are driven from the reference. No pcap is available, so testing was only done for syntax.

# Date: 2018-04-28
# Title: New MacOS Backdoor Linked to OceanLotus Found
# Reference: https://blog.trendmicro.com/trendlabs-security-intelligence/new-macos-backdoor-linked-to-oceanlotus-found/, https://www.virustotal.com/#/file/673ee7a57ba3c5a2384aeb17a66058e59f0a4d0cddc4f01fe32f369f6a845c8f/behavior
# Tests: syntax only

# Hashes: 673ee7a57ba3c5a2384aeb17a66058e59f0a4d0cddc4f01fe32f369f6a845c8f, 4da8365241c6b028a13b82d852c4f0155eb3d902782c6a538ac007a44a7d61b4
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Osx.Trojan.OceanLotus variant outbound connection"; flow:to_server,established; content:"POST"; http_method; content:"User-Agent: curl/"; fast_pattern:only; http_header; content:".js"; http_uri; pcre:"/\/[a-zA-Z0-9]{10,}\.js/U"; metadata:ruleset community, service http; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/new-macos-backdoor-linked-to-oceanlotus-found/; classtype:trojan-activity; sid:8000027; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Osx.Trojan.OceanLotus variant outbound connection"; flow:to_server,established; content:"GET"; http_method; content:"User-Agent: curl/"; fast_pattern:only; http_header; content:"Cookie: m_pixel_ratio="; http_header; content:".css"; http_uri; content:!"Connection"; http_header; content:!"Content"; http_header; pcre:"/Cookie\x3a\x20m_pixel_ratio\x3d[a-f0-9]{32}\x3b/H"; metadata:ruleset community, service http; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/new-macos-backdoor-linked-to-oceanlotus-found/; classtype:trojan-activity; sid:8000028; rev:1;)

Thanks.
YM
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