Cobalt Stike Beacon Detected – 91[.]211[.]91[.]110:443

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 2021-11-15T08:19:20.299278

Cobalt Strike
Cobalt Strike

General Information

146473198
Cloud Provider
Cloud Region
Service
DomainsN/A
HostnamesN/A
HTTP Host91[.]211[.]91[.]110
ISPPE Brezhnev Daniil
ORGPE Brezhnev Daniil
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)Kyiv
LOCATION (COUNTRY CODE)UA
LOCATION (COUNTRY NAME)Ukraine
LOCATION (LATITUDE)50.45466
LOCATION (LONGITUDE)30.5238
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
TAGSself-signed


Cobalt Strike Beacon Information

Beacon TypeHTTPS
http-get.clientAccept: */*, Host: download[.]windowsupdate[.]com, SESSION=, Cookie
http-post.clientAccept: */*, Host: download[.]windowsupdate[.]com, update_id
DNS Beacon MaxDNSN/A
DNS Beacon IdleN/A
Beacon Jitter20
dns-beacon.strategy_fail_seconds-1
dns-beacon.strategy_rotate_seconds-1
dns-beacon.strategy_fail_x-1
HTTP GET URIhotbunniesnft[.]art,/c/msdownload/update/others/2020/10/29136388_
HTTP POST URI/c/msdownload/update/others/2020/10/28986731_
Max GET Size1048576
Port443
post-ex.spawnto_x64%windir%\sysnative\wusa[.]exe
post-ex.spawnto_x86%windir%\syswow64\wusa[.]exe
process-inject.startrwx4
process-inject.userwx32
process-inject.allocator1
proxy.behavior2 (Use IE settings)
sleeptime60000
useragent_headerWindows-Update-Agent/10.0.10011.16384 Client-Protocol/1.40
uses_cookies1
process-inject.executentdll:RtlUserThreadStart, CreateThread, NtQueueApcThread-s, CreateRemoteThread, RtlCreateUserThread
Watermark1580103824
Beacon Stage Cleanup1