Cobalt Stike Beacon Detected – 16[.]162[.]34[.]39:443

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 2021-11-09T20:21:32.444771

Cobalt Strike
Cobalt Strike

General Information

1533523419
Cloud ProviderAmazon
Cloud Regionap-east-1
ServiceAMAZON
Domainsamazonaws[.]com
Hostnamesec2-16-162-34-39[.]ap-east-1[.]compute[.]amazonaws[.]com
HTTP Host16[.]162[.]34[.]39
ISPAmazon.com, Inc.
ORGAmazon Data Services Hong Kong
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)Hong Kong
LOCATION (COUNTRY CODE)HK
LOCATION (COUNTRY NAME)Hong Kong
LOCATION (LATITUDE)22.27832
LOCATION (LONGITUDE)114.17469
LOCATION (POSTAL CODE)N/A
SSL SERIAL
SSL EXPIREDN/A
SSL FINGERPRINT (SHA1)975bcafc5c13a7eb8bf33ea68805d9e41f4ba94e
SSL ISSUED20210914113122Z
SSL EXPIRES20211213113122Z
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.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 URI16[.]162[.]34[.]39,/c/msdownload/update/others/2021/03/29136388_
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)
sleeptime10000
useragent_headerWindows-Update-Agent/10.0.10011.16384 Client-Protocol/1.40
uses_cookies1
process-inject.executentdll:RtlUserThreadStart, CreateThread, NtQueueApcThread-s, CreateRemoteThread, RtlCreateUserThread
Watermark1234567890
Beacon Stage Cleanup1