Cobalt Stike Beacon Detected – 123[.]57[.]73[.]247:443

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 2021-11-11T17:02:06.466992

General Information

744743870

Cloud Provider
Cloud Region
Service
Domains	N/A
Hostnames	N/A
HTTP Host	123[.]57[.]73[.]247
ISP	Hangzhou Alibaba Advertising Co.,Ltd.
ORG	Aliyun Computing 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)	Beijing
LOCATION (COUNTRY CODE)	CN
LOCATION (COUNTRY NAME)	China
LOCATION (LATITUDE)	39.9075
LOCATION (LONGITUDE)	116.39723
LOCATION (POSTAL CODE)	N/A
SSL SERIAL
SSL EXPIRED	N/A
SSL FINGERPRINT (SHA1)	377e950c0abe6e194ced031fdd0ce02a477940b1
SSL ISSUED	20210221052005Z
SSL EXPIRES	20220221052005Z
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=, Cookie
http-post.client	Accept: text/plain, Accept-Language: en-us, Accept-Encoding: text/plain, Content-Type: application/x-www-form-urltrytryd, id, &op=1&id=vxeykS&ui=Josh @ PC&wv=11&gr=backoff&bv=1[.]55&data=
DNS Beacon MaxDNS	235
DNS Beacon Idle	134743044
Beacon Jitter	10
dns-beacon.strategy_fail_seconds	N/A
dns-beacon.strategy_rotate_seconds	N/A
dns-beacon.strategy_fail_x	N/A
HTTP GET URI	123[.]57[.]73[.]247,/updates
HTTP POST URI	/hello/flash.php
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	4000
useragent_header	Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Firefox/24.0
uses_cookies	1
process-inject.execute	CreateThread, SetThreadContext, CreateRemoteThread, RtlCreateUserThread
Watermark	N/A
Beacon Stage Cleanup	N/A