Cobalt Stike Beacon Detected – 172[.]105[.]228[.]71:8443

Cobalt Strike Beacon Detection Alerts

The Information provided at the time of posting was detected as “Cobalt Strike”. Depending on when you are viewing this article, it may no longer be the case and could be determined as being a false positive. Please do your own additional validation. – RedPacket Security

TimeStamp 2021-11-16T00:56:35.931432

Cobalt Strike
Cobalt Strike

General Information

146473198
Cloud ProviderLinode
Cloud Regionjp-13
ServiceN/A
Domainslinode[.]com
Hostnamesli1882-71[.]members[.]linode[.]com
HTTP Host172[.]105[.]228[.]71
ISPLinode, LLC
ORGLinode
OSN/A
HTTPN/A
HTTP HTML HASHN/A
HTTP LOCATION/
HTTP REDIRECTS
HTTP ROBOTSN/A
HTTP ROBOTS HASHN/A
HTTP SECURITY.TXTN/A
HTTP SECURITY.TXT HASHN/A
HTTP SERVERN/A
HTTP SITEMAPN/A
HTTP SITEMAP HASHN/A
HTTP TITLEN/A
LOCATION (AREA CODE)N/A
LOCATION (CITY)Tokyo
LOCATION (COUNTRY CODE)JP
LOCATION (COUNTRY NAME)Japan
LOCATION (LATITUDE)35.6895
LOCATION (LONGITUDE)139.69171
LOCATION (POSTAL CODE)N/A
SSL SERIAL
SSL EXPIREDN/A
SSL FINGERPRINT (SHA1)6ece5ece4192683d2d84e25b0ba7e04f9cb7eb7c
SSL ISSUED20150520182624Z
SSL EXPIRES20250517182624Z
SSL CYPHERECDHE-RSA-AES256-GCM-SHA384
SSL VERSIONTLSv1/SSLv3
SSL TRUST (REVOKED)N/A
TAGScloud, self-signed


Cobalt Strike Beacon Information

Beacon TypeHTTPS
http-get.clientCookie
http-post.clientContent-Type: application/octet-stream, id
DNS Beacon MaxDNS255
DNS Beacon IdleN/A
Beacon JitterN/A
dns-beacon.strategy_fail_secondsN/A
dns-beacon.strategy_rotate_secondsN/A
dns-beacon.strategy_fail_xN/A
HTTP GET URI172[.]105[.]228[.]71,/en_US/all[.]js
HTTP POST URI/submit.php
Max GET Size1048576
Port8443
post-ex.spawnto_x64%windir%\sysnative\rundll32[.]exe
post-ex.spawnto_x86%windir%\syswow64\rundll32[.]exe
process-inject.startrwx64
process-inject.userwx64
process-inject.allocatorN/A
proxy.behavior2 (Use IE settings)
sleeptime60000
useragent_headerMozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0; MAARJS)
uses_cookies1
process-inject.executeCreateThread, SetThreadContext, CreateRemoteThread, RtlCreateUserThread
WatermarkN/A
Beacon Stage CleanupN/A