Cobalt Stike Beacon Detected – 1[.]116[.]141[.]23:443

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 2021-11-13T14:33:43.513588

General Information

538830775

Cloud Provider
Cloud Region
Service
Domains	N/A
Hostnames	N/A
HTTP Host	1[.]116[.]141[.]23
ISP	Shenzhen Tencent Computer Systems Company Limited
ORG	Tencent cloud computing (Beijing) Co., Ltd.
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)	Shenzhen
LOCATION (COUNTRY CODE)	CN
LOCATION (COUNTRY NAME)	China
LOCATION (LATITUDE)	22.54554
LOCATION (LONGITUDE)	114.0683
LOCATION (POSTAL CODE)	N/A
SSL SERIAL
SSL EXPIRED	N/A
SSL FINGERPRINT (SHA1)	c85cc44dfbed264cf8f71fb5258705427ecf6187
SSL ISSUED	20210922160059Z
SSL EXPIRES	20220922160059Z
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	User-Agent: Mozilla/4[.]0 (Compatible; MSIE 6[.]0;Windows NT 5[.]1), Accept: */*, [.][.][.], [.][.][.][.][.][.], [.], tmp
http-post.client	Content-Type: application/octet-stream, User-Agent: Mozilla/4[.]0 (Compatible; MSIE 6[.]0;Windows NT 5[.]1), /default[.]asp
DNS Beacon MaxDNS	N/A
DNS Beacon Idle	N/A
Beacon Jitter	N/A
dns-beacon.strategy_fail_seconds	N/A
dns-beacon.strategy_rotate_seconds	N/A
dns-beacon.strategy_fail_x	N/A
HTTP GET URI	1[.]116[.]141[.]23,/MicrosoftUpdate/ShellEx/KB242782/default[.]aspx
HTTP POST URI	/MicrosoftUpdate/GetUpdate/KB
Max GET Size	1048576
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	400
useragent_header	Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; BOIE9;ENUS)
uses_cookies	N/A
process-inject.execute	CreateThread, SetThreadContext, CreateRemoteThread, RtlCreateUserThread
Watermark	574247
Beacon Stage Cleanup	N/A