Florian Roth
101 lines
3.3 KiB
YAML
101 lines
3.3 KiB
YAML
title: Shells Spawned by Web Servers
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id: 8202070f-edeb-4d31-a010-a26c72ac5600
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status: test
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description: Detects web servers that spawn shell processes which could be the result of a successfully placed web shell or another attack
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author: Thomas Patzke, Florian Roth, Zach Stanford @svch0st, Tim Shelton, Nasreddine Bencherchali (update)
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date: 2019/01/16
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modified: 2022/08/17
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references:
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- https://media.defense.gov/2020/Jun/09/2002313081/-1/-1/0/CSI-DETECT-AND-PREVENT-WEB-SHELL-MALWARE-20200422.PDF
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tags:
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- attack.persistence
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- attack.t1505.003
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- attack.t1190
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logsource:
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category: process_creation
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product: windows
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detection:
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selection_webserver_image:
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ParentImage|endswith:
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- '\w3wp.exe'
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- '\php-cgi.exe'
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- '\nginx.exe'
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- '\httpd.exe'
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- '\caddy.exe'
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- '\ws_TomcatService.exe'
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- '\tomcat.exe'
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- '\UMWorkerProcess.exe' # https://www.fireeye.com/blog/threat-research/2021/03/detection-response-to-exploitation-of-microsoft-exchange-zero-day-vulnerabilities.html
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selection_webserver_characteristics_tomcat1:
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ParentImage|endswith:
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- '\java.exe'
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- '\javaw.exe'
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ParentImage|contains:
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- '-tomcat-'
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- '\tomcat'
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selection_webserver_characteristics_tomcat2:
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ParentImage|endswith:
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- '\java.exe'
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- '\javaw.exe'
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ParentCommandLine|contains:
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- 'catalina.jar'
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- 'CATALINA_HOME'
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- 'catalina.home'
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anomaly_children:
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Image|endswith:
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- '\cmd.exe'
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- '\sh.exe'
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- '\bash.exe'
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- '\powershell.exe'
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- '\pwsh.exe'
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- '\bitsadmin.exe'
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- '\arp.exe'
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- '\at.exe'
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- '\certutil.exe'
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- '\dsget.exe'
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- '\dsquery.exe'
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- '\find.exe'
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- '\findstr.exe'
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- '\fsutil.exe'
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- '\hostname.exe'
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- '\ipconfig.exe'
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- '\nbtstat.exe'
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- '\net.exe'
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- '\net1.exe'
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- '\netdom.exe'
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- '\netsh.exe'
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- '\netstat.exe'
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- '\nltest.exe'
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- '\nslookup.exe'
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- '\ntdutil.exe'
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- '\pathping.exe'
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- '\ping.exe'
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- '\qprocess.exe'
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- '\query.exe'
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- '\qwinsta.exe'
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- '\reg.exe'
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- '\rundll32.exe'
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- '\sc.exe'
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- '\schtasks.exe'
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- '\systeminfo.exe'
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- '\tasklist.exe'
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- '\tracert.exe'
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- '\ver.exe'
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- '\vssadmin.exe'
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- '\wevtutil.exe'
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- '\whoami.exe'
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- '\wmic.exe'
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- '\wusa.exe'
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false_positive1:
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CommandLine|endswith: 'Windows\system32\cmd.exe /c C:\ManageEngine\ADManager "Plus\ES\bin\elasticsearch.bat -Enode.name=RMP-NODE1 -pelasticsearch-pid.txt'
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false_positive2:
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CommandLine|contains|all:
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- 'sc query'
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- 'ADManager Plus'
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condition: 1 of selection* and anomaly_children and not 1 of false_positive*
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fields:
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- CommandLine
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- ParentCommandLine
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falsepositives:
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- Particular web applications may spawn a shell process legitimately
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level: high
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