Cobalt Stike Beacon Detected – 66[.]42[.]36[.]13:443

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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 2021-11-14T05:51:09.391362

Cobalt Strike
Cobalt Strike

General Information

748026944
Cloud ProviderVultr
Cloud RegionN/A
ServiceN/A
Domainsvultr[.]com
Hostnames66[.]42[.]36[.]13[.]vultr[.]com
HTTP Host66[.]42[.]36[.]13
ISPThe Constant Company, LLC
ORGThe Constant Company, LLC
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 SERVERESF
HTTP SITEMAPN/A
HTTP SITEMAP HASHN/A
HTTP TITLEN/A
LOCATION (AREA CODE)N/A
LOCATION (CITY)Tokyo
LOCATION (COUNTRY CODE)JP
LOCATION (COUNTRY NAME)Japan
LOCATION (LATITUDE)35.6895
LOCATION (LONGITUDE)139.69171
LOCATION (POSTAL CODE)N/A
SSL SERIAL
SSL EXPIREDN/A
SSL FINGERPRINT (SHA1)2d06ce79ffee36a00ed2ae37744278f5a3029c72
SSL ISSUED20210928033035Z
SSL EXPIRES21210904033035Z
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: application/xhtml+xml, application/xml, image/*, Accept-Language: es-gt, Accept-Encoding: compress, br, secure_id_O71O9MJYUENWDEQE0K=, Cookie
http-post.clientAccept: image/*, application/json, application/xml, Accept-Language: zu, Accept-Encoding: compress, br, _IAOKOOJE
DNS Beacon MaxDNSN/A
DNS Beacon IdleN/A
Beacon Jitter36
dns-beacon.strategy_fail_seconds-1
dns-beacon.strategy_rotate_seconds-1
dns-beacon.strategy_fail_x-1
HTTP GET URI66[.]42[.]36[.]13,/Demonstrate/v1[.]52/KVADCDMX6
HTTP POST URI/Split/v6.82/KN1TDHCAFOC0
Max GET Size2098999
Port443
post-ex.spawnto_x64%windir%\sysnative\w32tm[.]exe
post-ex.spawnto_x86%windir%\syswow64\grpconv[.]exe
process-inject.startrwx4
process-inject.userwx32
process-inject.allocatorN/A
proxy.behavior2 (Use IE settings)
sleeptime5000
useragent_headerMozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36
uses_cookies1
process-inject.executentdll:RtlUserThreadStart, CreateThread, NtQueueApcThread-s, CreateRemoteThread, RtlCreateUserThread
Watermark6
Beacon Stage Cleanup1
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