mirror of
https://github.com/splunk/security_content
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Bhavin Patel
83 lines
3.7 KiB
YAML
83 lines
3.7 KiB
YAML
name: Detect Webshell Exploit Behavior
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id: 22597426-6dbd-49bd-bcdc-4ec19857192f
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version: 2
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date: '2023-04-26'
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author: Steven Dick
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status: production
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type: TTP
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description: This search is used to detect the abuse of web applications by adversaries. Adversaries may install a backdoor or script onto web servers by exploiting known vulnerabilities or misconfigruations. Web shells are used to establish persistent access to systems and provide a set of executable functions or a command-line interface on the system hosting the Web server.
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data_source:
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- Sysmon Event ID 1
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search: '| tstats `security_content_summariesonly` count max(_time) as lastTime, min(_time) as firstTime from datamodel=Endpoint.Processes
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where (Processes.process_name IN ("arp.exe","at.exe","bash.exe","bitsadmin.exe","certutil.exe","cmd.exe","cscript.exe",
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"dsget.exe","dsquery.exe","find.exe","findstr.exe","fsutil.exe","hostname.exe","ipconfig.exe","ksh.exe","nbstat.exe",
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"net.exe","net1.exe","netdom.exe","netsh.exe","netstat.exe","nltest.exe","nslookup.exe","ntdsutil.exe","pathping.exe",
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"ping.exe","powershell.exe","pwsh.exe","qprocess.exe","query.exe","qwinsta.exe","reg.exe","rundll32.exe","sc.exe",
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"scrcons.exe","schtasks.exe","sh.exe","systeminfo.exe","tasklist.exe","tracert.exe","ver.exe","vssadmin.exe",
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"wevtutil.exe","whoami.exe","wmic.exe","wscript.exe","wusa.exe","zsh.exe")
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AND Processes.parent_process_name IN ("w3wp.exe", "http*.exe", "nginx*.exe", "php*.exe", "php-cgi*.exe","tomcat*.exe"))
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by Processes.dest,Processes.user,Processes.parent_process,Processes.parent_process_name,Processes.process,Processes.process_name
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| `drop_dm_object_name("Processes")`
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `detect_webshell_exploit_behavior_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that includes the full command line of the process being launched on
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your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: Legitimate OS functions called by vendor applications, baseline the environment and filter before enabling. Recommend throttle by dest/process_name
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references:
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- https://attack.mitre.org/techniques/T1505/003/
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- https://github.com/nsacyber/Mitigating-Web-Shells
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- https://www.hackingarticles.in/multiple-ways-to-exploit-tomcat-manager/
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tags:
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analytic_story:
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- ProxyShell
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- ProxyNotShell
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- HAFNIUM Group
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- CISA AA22-257A
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- CISA AA22-264A
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asset_type: Endpoint
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confidence: 80
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impact: 100
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message: Webshell Exploit Behavior - $parent_process_name$ spawned $process_name$ on $dest$.
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mitre_attack_id:
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- T1505
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- T1505.003
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observable:
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- name: user
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type: User
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role:
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- Victim
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- name: dest
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type: Endpoint
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role:
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- Victim
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- name: process_name
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type: Process
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role:
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- Attacker
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- Processes.dest
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- Processes.user
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- Processes.parent_process
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- Processes.parent_process_name
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- Processes.process
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- Processes.process_name
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risk_score: 80
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security_domain: endpoint
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supported_tas:
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- Splunk_TA_microsoft_sysmon
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1505.003/generic_webshell_exploit/generic_webshell_exploit.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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