Squid proxy events for ToR proxies
| Id | 90d3f6ec-80fb-48e0-9937-2c70c9df9bad |
| Rulename | Squid proxy events for ToR proxies |
| Description | Check for Squid proxy events associated with common ToR proxies. This query presumes the default squid log format is being used. http://www.squid-cache.org/Doc/config/access_log/ |
| Severity | Low |
| Tactics | CommandAndControl |
| Techniques | T1090 T1008 |
| Required data connectors | Syslog SyslogAma |
| Kind | Scheduled |
| Query frequency | 1d |
| Query period | 1d |
| Trigger threshold | 0 |
| Trigger operator | gt |
| Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Syslog/Analytic Rules/squid_tor_proxies.yaml |
| Version | 1.0.3 |
| Arm template | 90d3f6ec-80fb-48e0-9937-2c70c9df9bad.json |
let DomainList = dynamic(["tor2web.org", "tor2web.com", "torlink.co", "onion.to", "onion.ink", "onion.cab", "onion.nu", "onion.link",
"onion.it", "onion.city", "onion.direct", "onion.top", "onion.casa", "onion.plus", "onion.rip", "onion.dog", "tor2web.fi",
"tor2web.blutmagie.de", "onion.sh", "onion.lu", "onion.pet", "t2w.pw", "tor2web.ae.org", "tor2web.io", "tor2web.xyz", "onion.lt",
"s1.tor-gateways.de", "s2.tor-gateways.de", "s3.tor-gateways.de", "s4.tor-gateways.de", "s5.tor-gateways.de", "hiddenservice.net"]);
Syslog
| where ProcessName contains "squid"
| extend URL = extract("(([A-Z]+ [a-z]{4,5}:\\/\\/)|[A-Z]+ )([^ :]*)",3,SyslogMessage),
SourceIP = extract("([0-9]+ )(([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3}))",2,SyslogMessage),
Status = extract("(TCP_(([A-Z]+)(_[A-Z]+)*)|UDP_(([A-Z]+)(_[A-Z]+)*))",1,SyslogMessage),
HTTP_Status_Code = extract("(TCP_(([A-Z]+)(_[A-Z]+)*)|UDP_(([A-Z]+)(_[A-Z]+)*))/([0-9]{3})",8,SyslogMessage),
User = extract("(CONNECT |GET )([^ ]* )([^ ]+)",3,SyslogMessage),
RemotePort = extract("(CONNECT |GET )([^ ]*)(:)([0-9]*)",4,SyslogMessage),
Domain = extract("(([A-Z]+ [a-z]{4,5}:\\/\\/)|[A-Z]+ )([^ :\\/]*)",3,SyslogMessage),
Bytes = toint(extract("([A-Z]+\\/[0-9]{3} )([0-9]+)",2,SyslogMessage)),
contentType = extract("([a-z/]+$)",1,SyslogMessage)
| extend TLD = extract("\\.[a-z]*$",0,Domain)
| where HTTP_Status_Code == "200"
| where Domain contains "."
| where Domain has_any (DomainList)
| extend AccountName = tostring(split(User, "@")[0]), AccountUPNSuffix = tostring(split(User, "@")[1])
queryPeriod: 1d
entityMappings:
- fieldMappings:
- identifier: FullName
columnName: User
- identifier: Name
columnName: AccountName
- identifier: UPNSuffix
columnName: AccountUPNSuffix
entityType: Account
- fieldMappings:
- identifier: Address
columnName: SourceIP
entityType: IP
- fieldMappings:
- identifier: Url
columnName: URL
entityType: URL
relevantTechniques:
- T1090
- T1008
severity: Low
requiredDataConnectors:
- connectorId: Syslog
dataTypes:
- Syslog
- connectorId: SyslogAma
dataTypes:
- Syslog
id: 90d3f6ec-80fb-48e0-9937-2c70c9df9bad
triggerOperator: gt
kind: Scheduled
query: |
let DomainList = dynamic(["tor2web.org", "tor2web.com", "torlink.co", "onion.to", "onion.ink", "onion.cab", "onion.nu", "onion.link",
"onion.it", "onion.city", "onion.direct", "onion.top", "onion.casa", "onion.plus", "onion.rip", "onion.dog", "tor2web.fi",
"tor2web.blutmagie.de", "onion.sh", "onion.lu", "onion.pet", "t2w.pw", "tor2web.ae.org", "tor2web.io", "tor2web.xyz", "onion.lt",
"s1.tor-gateways.de", "s2.tor-gateways.de", "s3.tor-gateways.de", "s4.tor-gateways.de", "s5.tor-gateways.de", "hiddenservice.net"]);
Syslog
| where ProcessName contains "squid"
| extend URL = extract("(([A-Z]+ [a-z]{4,5}:\\/\\/)|[A-Z]+ )([^ :]*)",3,SyslogMessage),
SourceIP = extract("([0-9]+ )(([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3}))",2,SyslogMessage),
Status = extract("(TCP_(([A-Z]+)(_[A-Z]+)*)|UDP_(([A-Z]+)(_[A-Z]+)*))",1,SyslogMessage),
HTTP_Status_Code = extract("(TCP_(([A-Z]+)(_[A-Z]+)*)|UDP_(([A-Z]+)(_[A-Z]+)*))/([0-9]{3})",8,SyslogMessage),
User = extract("(CONNECT |GET )([^ ]* )([^ ]+)",3,SyslogMessage),
RemotePort = extract("(CONNECT |GET )([^ ]*)(:)([0-9]*)",4,SyslogMessage),
Domain = extract("(([A-Z]+ [a-z]{4,5}:\\/\\/)|[A-Z]+ )([^ :\\/]*)",3,SyslogMessage),
Bytes = toint(extract("([A-Z]+\\/[0-9]{3} )([0-9]+)",2,SyslogMessage)),
contentType = extract("([a-z/]+$)",1,SyslogMessage)
| extend TLD = extract("\\.[a-z]*$",0,Domain)
| where HTTP_Status_Code == "200"
| where Domain contains "."
| where Domain has_any (DomainList)
| extend AccountName = tostring(split(User, "@")[0]), AccountUPNSuffix = tostring(split(User, "@")[1])
tactics:
- CommandAndControl
triggerThreshold: 0
queryFrequency: 1d
description: |
'Check for Squid proxy events associated with common ToR proxies. This query presumes the default squid log format is being used.
http://www.squid-cache.org/Doc/config/access_log/'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Syslog/Analytic Rules/squid_tor_proxies.yaml
name: Squid proxy events for ToR proxies
version: 1.0.3
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/90d3f6ec-80fb-48e0-9937-2c70c9df9bad')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/90d3f6ec-80fb-48e0-9937-2c70c9df9bad')]",
"properties": {
"alertRuleTemplateName": "90d3f6ec-80fb-48e0-9937-2c70c9df9bad",
"customDetails": null,
"description": "'Check for Squid proxy events associated with common ToR proxies. This query presumes the default squid log format is being used.\nhttp://www.squid-cache.org/Doc/config/access_log/'\n",
"displayName": "Squid proxy events for ToR proxies",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "User",
"identifier": "FullName"
},
{
"columnName": "AccountName",
"identifier": "Name"
},
{
"columnName": "AccountUPNSuffix",
"identifier": "UPNSuffix"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "SourceIP",
"identifier": "Address"
}
]
},
{
"entityType": "URL",
"fieldMappings": [
{
"columnName": "URL",
"identifier": "Url"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Syslog/Analytic Rules/squid_tor_proxies.yaml",
"query": "let DomainList = dynamic([\"tor2web.org\", \"tor2web.com\", \"torlink.co\", \"onion.to\", \"onion.ink\", \"onion.cab\", \"onion.nu\", \"onion.link\",\n\"onion.it\", \"onion.city\", \"onion.direct\", \"onion.top\", \"onion.casa\", \"onion.plus\", \"onion.rip\", \"onion.dog\", \"tor2web.fi\",\n\"tor2web.blutmagie.de\", \"onion.sh\", \"onion.lu\", \"onion.pet\", \"t2w.pw\", \"tor2web.ae.org\", \"tor2web.io\", \"tor2web.xyz\", \"onion.lt\",\n\"s1.tor-gateways.de\", \"s2.tor-gateways.de\", \"s3.tor-gateways.de\", \"s4.tor-gateways.de\", \"s5.tor-gateways.de\", \"hiddenservice.net\"]);\nSyslog\n| where ProcessName contains \"squid\"\n| extend URL = extract(\"(([A-Z]+ [a-z]{4,5}:\\\\/\\\\/)|[A-Z]+ )([^ :]*)\",3,SyslogMessage),\n SourceIP = extract(\"([0-9]+ )(([0-9]{1,3})\\\\.([0-9]{1,3})\\\\.([0-9]{1,3})\\\\.([0-9]{1,3}))\",2,SyslogMessage),\n Status = extract(\"(TCP_(([A-Z]+)(_[A-Z]+)*)|UDP_(([A-Z]+)(_[A-Z]+)*))\",1,SyslogMessage),\n HTTP_Status_Code = extract(\"(TCP_(([A-Z]+)(_[A-Z]+)*)|UDP_(([A-Z]+)(_[A-Z]+)*))/([0-9]{3})\",8,SyslogMessage),\n User = extract(\"(CONNECT |GET )([^ ]* )([^ ]+)\",3,SyslogMessage),\n RemotePort = extract(\"(CONNECT |GET )([^ ]*)(:)([0-9]*)\",4,SyslogMessage),\n Domain = extract(\"(([A-Z]+ [a-z]{4,5}:\\\\/\\\\/)|[A-Z]+ )([^ :\\\\/]*)\",3,SyslogMessage),\n Bytes = toint(extract(\"([A-Z]+\\\\/[0-9]{3} )([0-9]+)\",2,SyslogMessage)),\n contentType = extract(\"([a-z/]+$)\",1,SyslogMessage)\n| extend TLD = extract(\"\\\\.[a-z]*$\",0,Domain)\n| where HTTP_Status_Code == \"200\"\n| where Domain contains \".\"\n| where Domain has_any (DomainList)\n| extend AccountName = tostring(split(User, \"@\")[0]), AccountUPNSuffix = tostring(split(User, \"@\")[1])\n",
"queryFrequency": "P1D",
"queryPeriod": "P1D",
"severity": "Low",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CommandAndControl"
],
"techniques": [
"T1008",
"T1090"
],
"templateVersion": "1.0.3",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}