Delete windows_remote_access_software_brc4_loaded_dll.yml

detections/endpoint/windows_remote_access_software_brc4_loaded_dll.yml

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-name: Windows Remote Access Software BRC4 Loaded Dll
-id: 73cf5dcb-cf36-4167-8bbe-384fe5384d05
-version: 1
-date: '2022-08-24'
-author: Teoderick Contreras, Splunk
-type: Anomaly
-datamodel:
-- Endpoint
-description: The following anomaly detection identifies the behavior related to 4 native Windows DLLs being loaded by a non-standard process. 
-  Identified by MDSec during their research into Brute Ratel, MDSec identified a high signal analytic by calling out these 4 DLLs being loaded 
-  into a process. LogonCLI.dll is the Net Logon Client DLL and is related to users and other domain services to get authenticated. Credui.dll 
-  is Credential Manager User Interface. Credential managers receive notifications when authentication information changes. 
-  For example, credential managers are notified when a user logs on or an account password changes. 
-  Samcli.dll is the Security Accounts Manager Client DLL. Adversaries may attempt to extract credential material from the Security Account Manager (SAM) 
-  database either through in-memory techniques or through the Windows Registry where the SAM database is stored. 
-  Dbghelp.dll is Windows Image Helper. Windows Image Helper is commonly seen in credential dumping due to native functions. 
-  All of these modules are important to monitor and track and combined may lead to credentail access or dumping.
-search: '`sysmon` EventCode=7 
-  |bin _time span=30s
-  | eval BRC4_AnomalyLoadedDll=case(OriginalFileName=="credui.dll", 1, OriginalFileName=="DBGHELP.DLL", 1, OriginalFileName=="SAMCLI.DLL", 1, OriginalFileName=="winhttp.dll", 1, 1=1, 0)
-  | eval BRC4_LoadedDllPath=case(match(ImageLoaded, "credui.dll"), 1, match(ImageLoaded, "dbghelp.dll"), 1, match(ImageLoaded, "samcli.dll"), 1, match(ImageLoaded, "winhttp.dll"), 1, 1=1, 0)
-  | stats count min(_time) as firstTime max(_time) as lastTime values(ImageLoaded) as ImageLoaded values(OriginalFileName) as OriginalFileName dc(ImageLoaded) as ImageLoadedCount by Image  BRC4_LoadedDllPath BRC4_AnomalyLoadedDll Computer EventCode Signed
-  | where  ImageLoadedCount == 4 AND (BRC4_LoadedDllPath == 1 OR BRC4_AnomalyLoadedDll == 1)
-  | `security_content_ctime(firstTime)` 
-  | `security_content_ctime(lastTime)` 
-  | `windows_remote_access_software_brc4_loaded_dll_filter`'
-how_to_implement: The latest Sysmon TA 3.0 https://splunkbase.splunk.com/app/5709 will 
-  add the ImageLoaded name to the process_name field, allowing this query to work. Use as an example and implement for other products.
-known_false_positives: This module can be loaded by a third party application. Filter is needed.
-references:
-- https://unit42.paloaltonetworks.com/brute-ratel-c4-tool/
-- https://www.mdsec.co.uk/2022/08/part-3-how-i-met-your-beacon-brute-ratel/
-- https://strontic.github.io/xcyclopedia/library/logoncli.dll-138871DBE68D0696D3D7FA91BC2873B1.html
-- https://strontic.github.io/xcyclopedia/library/credui.dll-A5BD797BBC2DD55231B9DE99837E5461.html
-- https://docs.microsoft.com/en-us/windows/win32/secauthn/credential-manager
-- https://strontic.github.io/xcyclopedia/library/samcli.dll-522D6D616EF142CDE965BD3A450A9E4C.html
-- https://strontic.github.io/xcyclopedia/library/dbghelp.dll-15A55EAB307EF8C190FE6135C0A86F7C.html
-tags:
-  analytic_story:
-  - Brute Ratel C4
-  asset_type: Endpoint
-  cis20:
-  - CIS 3
-  - CIS 5
-  - CIS 16
-  confidence: 30
-  context:
-  - Source:Endpoint
-  dataset:
-  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/brute_ratel/iso_version_dll_campaign/sysmon.log
-  impact: 30
-  kill_chain_phases:
-  - Exploitation
-  message: a process $Image$ loaded several modules $ImageLoaded$ that might related to credential access on $Computer$.
-  mitre_attack_id:
-  - T1219
-  - T1003
-  nist:
-  - DE.CM
-  observable:
-  - name: Computer
-    type: Endpoint
-    role:
-    - Victim
-  product:
-  - Splunk Enterprise
-  - Splunk Enterprise Security
-  - Splunk Cloud
-  required_fields:
-  - _time
-  - Image
-  - ImageLoaded
-  - process_name
-  - Computer
-  - EventCode
-  - Signed
-  - ProcessId 
-  risk_score: 9
-  security_domain: endpoint