Query: detection rule: Detects changes to the AMSI come server registry key in order disable AMSI scanning functionalities. When AMSI attempts
Matching passage: Sigma rule: Detects changes to the AMSI come server registry key in order disable AMSI scanning functionalities. When AMSI attempts. Logsource: windows / registry_set. Rule: title: Potential AMSI COM Server Hijacking id: 160d2780-31f7-4922-8b3a-efce30e63e96 status: test description: Detects changes to the AMSI come server registry key in order disable AMSI scanning functionalities. When AMSI attempts to starts its COM component, it will query its registered CLSID and return a non-existent COM server. This causes a load failure and prevents any scanning methods from being accessed, ultimately rendering AMSI useless references: - https://enigma0x3.net/2017/07/19/bypassing-amsi-via-com-server-hijacking/ - https://github.com/r00t-3xp10it/hacking-material-books/blob/43cb1e1932c16ff1f58b755bc9ab6b096046853f/obfuscation/simple_obfuscation.md#amsi-comreg-bypass author: Nasreddine Bencherchali (Nextron Systems) date: 2023-01-04 modified: 2023-08-17 tags: - attack.defense-impairment - attack.t1685 logsource: category: registry_set product: windows detection: selection: TargetObject|endswith: \CLSID\{fdb00e52-a214-4aa1-8fba-4357bb0072ec}\InProcServer32\(Default) filter: Details: '%windir%\system32\amsi.dll' condition: selection and not filter falsepositives: - Unknown level: high
Near-miss passage: Sigma rule: This rule detect common flag combinations used by CrackMapExec in order to detect its use even if the binary has been re. Logsource: windows / process_creation. Rule: title: HackTool - CrackMapExec Execution id: 42a993dd-bb3e-48c8-b372-4d6684c4106c status: test description: This rule detect common flag combinations used by CrackMapExec in order to detect its use even if the binary has been replaced. references: - https://mpgn.gitbook.io/crackmapexec/smb-protocol/authentication/checking-credentials-local - https://www.mandiant.com/resources/telegram-malware-iranian-espionage - https://www.infosecmatter.com/crackmapexec-module-library/?cmem=mssql-mimikatz - https://www.infosecmatter.com/crackmapexec-module-library/?cmem=smb-pe_inject author: Florian Roth (Nextron Systems) date: 2022-02-25 modified: 2023-03-08 tags: - attack.execution - attack.persistence - attack.privilege-escalation - attack.credential-access - attack.discovery - attack.t1047 - attack.t1053 - attack.t1059.003 - attack.t1059.001 - attack.t1110 - attack.t1201 logsource: category: process_creation product: windows detection: selection_binary: Image|endswith: \crackmapexec.exe selection_special: CommandLine|contains: ' -M pe_inject ' selection_execute: CommandLine|contains|all: - ' --local-auth' - ' -u ' - ' -x ' selection_hash: CommandLine|contains|all: - ' --local-auth' - ' -u ' - ' -p ' - ' -H ''NTHASH''' selection_module_mssql: CommandLine|contains|all: - ' mssql ' - ' -u ' - ' -p ' - ' -M ' - ' -d ' selection_module_smb1: CommandLine|contains|all: - ' smb ' - ' -u ' - ' -H ' - ' -M ' - ' -o ' selection_module_smb2: CommandLine|contains|all: - ' smb ' - ' -u ' - ' -p ' - ' --local-auth' part_localauth_1: CommandLine|contains|all: - ' --local-auth' - ' -u ' - ' -p ' part_localauth_2: CommandLine|contains|all: - ' 10.' - ' 192.168.' - '/24 ' condition: 1 of selection_* or all of part_localauth* falsepositives: - Unknown level: high