Cobalt Stike Beacon Detected – 149[.]28[.]8[.]3:443

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 2021-11-15T12:56:20.207298

General Information

146473198

Cloud Provider
Cloud Region
Service
Domains	vultr[.]com
Hostnames	149[.]28[.]8[.]3[.]vultr[.]com
HTTP Host	149[.]28[.]8[.]3
ISP	The Constant Company, LLC
ORG	Vultr Holdings, LLC
OS	N/A
HTTP	N/A
HTTP HTML HASH	N/A
HTTP LOCATION	/
HTTP REDIRECTS
HTTP ROBOTS	N/A
HTTP ROBOTS HASH	N/A
HTTP SECURITY.TXT	N/A
HTTP SECURITY.TXT HASH	N/A
HTTP SERVER	N/A
HTTP SITEMAP	N/A
HTTP SITEMAP HASH	N/A
HTTP TITLE	N/A
LOCATION (AREA CODE)	N/A
LOCATION (CITY)	Seattle
LOCATION (COUNTRY CODE)	US
LOCATION (COUNTRY NAME)	United States
LOCATION (LATITUDE)	47.60621
LOCATION (LONGITUDE)	-122.33207
LOCATION (POSTAL CODE)	N/A
SSL SERIAL
SSL EXPIRED	N/A
SSL FINGERPRINT (SHA1)	6ece5ece4192683d2d84e25b0ba7e04f9cb7eb7c
SSL ISSUED	20150520182624Z
SSL EXPIRES	20250517182624Z
SSL CYPHER	ECDHE-RSA-AES256-GCM-SHA384
SSL VERSION	TLSv1/SSLv3
SSL TRUST (REVOKED)	N/A
TAGS	self-signed

Cobalt Strike Beacon Information

Beacon Type	HTTPS
http-get.client	Accept: text/html,application/xhtml+xml,application/xml;q=0[.]9,*/*l;q=0[.]8, Referer: https://www[.]Google[.]com, Pragma: no-cache, Cache-Control: no-cache, [.]gif
http-post.client	Content-Type: application/octet-stream, Referer: https://www[.]Google[.]com, Pragma: no-cache, Cache-Control: no-cache, [.]png
DNS Beacon MaxDNS	N/A
DNS Beacon Idle	N/A
Beacon Jitter	N/A
dns-beacon.strategy_fail_seconds	-1
dns-beacon.strategy_rotate_seconds	-1
dns-beacon.strategy_fail_x	-1
HTTP GET URI	b[.]pwn-t[.]tk,/image/,www[.]pwn-t[.]tk,/image/,a[.]pwn-t[.]tk,/image/,c[.]pwn-t[.]tk,/image/,d[.]pwn-t[.]tk,/image/,www[.]yang1144[.]tk,/image/
HTTP POST URI	/email/
Max GET Size	1398104
Port	443
post-ex.spawnto_x64	%windir%\sysnative\rundll32[.]exe
post-ex.spawnto_x86	%windir%\syswow64\rundll32[.]exe
process-inject.startrwx	64
process-inject.userwx	64
process-inject.allocator	N/A
proxy.behavior	2 (Use IE settings)
sleeptime	10000
useragent_header	Mozilla/5.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/5.0)
uses_cookies	N/A
process-inject.execute	CreateThread, SetThreadContext, CreateRemoteThread, RtlCreateUserThread
Watermark	1234567890
Beacon Stage Cleanup	N/A