Query: detection rule: Detects the use of the Windows Update Client binary (wuauclt.exe) to proxy execute code and making network connections.
Matching passage: Sigma rule: Detects the use of the Windows Update Client binary (wuauclt.exe) to proxy execute code and making network connections.. Logsource: windows / network_connection. Rule: title: Potentially Suspicious Wuauclt Network Connection id: c649a6c7-cd8c-4a78-9c04-000fc76df954 status: test description: 'Detects the use of the Windows Update Client binary (wuauclt.exe) to proxy execute code and making network connections. One could easily make the DLL spawn a new process and inject to it to proxy the network connection and bypass this rule. ' references: - https://dtm.uk/wuauclt/ author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research) date: 2020-10-12 modified: 2024-03-12 tags: - attack.stealth - attack.t1218 logsource: category: network_connection product: windows definition: 'Requirements: The CommandLine field enrichment is required in order for this rule to be used.' detection: selection: Image|contains: wuauclt CommandLine|contains: ' /RunHandlerComServer' filter_main_ip: DestinationIp|cidr: - 127.0.0.0/8 - 10.0.0.0/8 - 169.254.0.0/16 - 172.16.0.0/12 - 192.168.0.0/16 - ::1/128 - fe80::/10 - fc00::/7 filter_main_msrange: DestinationIp|cidr: - 20.184.0.0/13 - 20.192.0.0/10 - 23.79.0.0/16 - 51.10.0.0/15 - 51.103.0.0/16 - 51.104.0.0/15 - 52.224.0.0/11 filter_main_uus: CommandLine|contains: - :\Windows\UUS\Packages\Preview\amd64\updatedeploy.dll /ClassId - :\Windows\UUS\amd64\UpdateDeploy.dll /ClassId filter_main_winsxs: CommandLine|contains|all: - :\Windows\WinSxS\ - '\UpdateDeploy.dll /ClassId ' filter_main_cli_null: CommandLine: null filter_main_cli_empty: CommandLine: '' condition: selection and not 1 of filter_main_* falsepositives: - Unknown level: medium
Near-miss passage: Sigma rule: Adversaries may acquire credentials from web browsers by reading files specific to the target browser. Web browsers comm. Logsource: windows / process_creation. Rule: title: Potential Browser Data Stealing id: 47147b5b-9e17-4d76-b8d2-7bac24c5ce1b related: - id: fc028194-969d-4122-8abe-0470d5b8f12f type: derived status: test description: 'Adversaries may acquire credentials from web browsers by reading files specific to the target browser. Web browsers commonly save credentials such as website usernames and passwords so that they do not need to be entered manually in the future. Web browsers typically store the credentials in an encrypted format within a credential store. ' references: - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1555.003/T1555.003.md - https://www.cisa.gov/sites/default/files/2024-04/aa24-109a-stopransomware-akira-ransomware_2.pdf author: Nasreddine Bencherchali (Nextron Systems) date: 2022-12-23 modified: 2025-03-19 tags: - attack.credential-access - attack.t1555.003 logsource: category: process_creation product: windows detection: selection_cmd: - CommandLine|contains: - copy-item - 'copy ' - 'cpi ' - ' cp ' - 'move ' - move-item - ' mi ' - ' mv ' - Image|endswith: - \esentutl.exe - \xcopy.exe - \robocopy.exe - OriginalFileName: - esentutl.exe - XCOPY.EXE - robocopy.exe selection_path: CommandLine|contains: - \Amigo\User Data - \BraveSoftware\Brave-Browser\User Data - \CentBrowser\User Data - \Chromium\User Data - \CocCoc\Browser\User Data - \Comodo\Dragon\User Data - \Elements Browser\User Data - \Epic Privacy Browser\User Data - \Google\Chrome Beta\User Data - \Google\Chrome SxS\User Data - \Google\Chrome\User Data\ - \Kometa\User Data - \Maxthon5\Users - \Microsoft\Edge\User Data - \Mozilla\Firefox\Profiles - \Nichrome\User Data - \Opera Software\Opera GX Stable\ - \Opera Software\Opera Neon\User Data - \Opera Software\Opera Stable\ - \Orbitum\User Data - \QIP Surf\User Data - \Sputnik\User Data - \Torch\User Data - \uCozMedia\Uran\User Data - \Vivaldi\User Data condition: all of selection_* falsepositives: - Unknown level: medium