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Merge branch 'ransom_ttp2' of https://github.com/splunk/security_content into ransom_ttp2

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Detection Testing Service
2021-06-24 10:04:03 +00:00
parent 9cef2041f7 cf3bf43cb6
commit 5e2ee527a0
1 changed files with 15 additions and 10 deletions
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detections/endpoint/disable_amsi_through_registry.yml
+15 -10
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@@ -6,20 +6,22 @@ author: Teoderick Contreras, Splunk
type: batch
datamodel:
- Endpoint
description: this search is to identify modification in registry to disable AMSI windows feature to evade detections.
This technique was seen in several ransomware, RAT and even APT to impaire defenses of the compromise machine and to
be able to execute payload with minimal alert as much as possible.
description: this search is to identify modification in registry to disable AMSI windows
feature to evade detections. This technique was seen in several ransomware, RAT
and even APT to impaire defenses of the compromise machine and to be able to execute
payload with minimal alert as much as possible.
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
as lastTime from datamodel=Endpoint.Registry where Registry.registry_path= "*\\SOFTWARE\\Microsoft\\Windows Script\\Settings\\AmsiEnable"
Registry.registry_value_name = "DWORD (0x00000000)" by Registry.registry_path Registry.registry_key_name
Registry.registry_value_name Registry.dest | `drop_dm_object_name(Registry)` | `security_content_ctime(firstTime)`
|`security_content_ctime(lastTime)`
| `disable_amsi_through_registry_filter`'
as lastTime from datamodel=Endpoint.Registry where Registry.registry_path= "*\\SOFTWARE\\Microsoft\\Windows
Script\\Settings\\AmsiEnable" Registry.registry_value_name = "DWORD (0x00000000)"
by Registry.registry_path Registry.registry_key_name Registry.registry_value_name
Registry.dest | `drop_dm_object_name(Registry)` | `security_content_ctime(firstTime)`
|`security_content_ctime(lastTime)` | `disable_amsi_through_registry_filter`'
how_to_implement: To successfully implement this search you need to be ingesting information
on process that include the name of the process responsible for the changes from
your endpoints into the `Endpoint` datamodel in the `Registry` node. Also make sure
that this registry was included in your config files ex. sysmon config to be monitored.
known_false_positives: network operator may disable this feature of windows but not so common.
known_false_positives: network operator may disable this feature of windows but not
so common.
references:
- https://blog.f-secure.com/hunting-for-amsi-bypasses/
- https://gist.github.com/rxwx/8955e5abf18dc258fd6b43a3a7f4dbf9
@@ -41,4 +43,7 @@ tags:
- Registry.user
- Registry.dest
- Registry.registry_value_name
security_domain: endpoint
security_domain: endpoint
automated_detection_testing: passed
dataset:
- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/ransomware_ttp/data2/windows-sysmon.log