Query: detection rule: Detects the execution of "reg.exe" to alter registry keys that would replace the user's desktop background. This is a co
Matching passage: Sigma rule: Detects the execution of "reg.exe" to alter registry keys that would replace the user's desktop background. This is a co. Logsource: windows / process_creation. Rule: title: Potentially Suspicious Desktop Background Change Using Reg.EXE id: 8cbc9475-8d05-4e27-9c32-df960716c701 related: - id: 85b88e05-dadc-430b-8a9e-53ff1cd30aae type: similar status: test description: 'Detects the execution of "reg.exe" to alter registry keys that would replace the user''s desktop background. This is a common technique used by malware to change the desktop background to a ransom note or other image. ' references: - https://www.attackiq.com/2023/09/20/emulating-rhysida/ - https://research.checkpoint.com/2023/the-rhysida-ransomware-activity-analysis-and-ties-to-vice-society/ - https://www.trendmicro.com/en_us/research/23/h/an-overview-of-the-new-rhysida-ransomware.html - https://www.virustotal.com/gui/file/a864282fea5a536510ae86c77ce46f7827687783628e4f2ceb5bf2c41b8cd3c6/behavior - https://admx.help/?Category=Windows_10_2016&Policy=Microsoft.Policies.WindowsDesktop::Wallpaper - https://admx.help/?Category=Windows_10_2016&Policy=Microsoft.Policies.ControlPanelDisplay::CPL_Personalization_NoDesktopBackgroundUI author: Stephen Lincoln @slincoln-aiq (AttackIQ) date: 2023-12-21 tags: - attack.persistence - attack.impact - attack.defense-impairment - attack.t1112 - attack.t1491.001 logsource: product: windows category: process_creation detection: selection_reg_img: - Image|endswith: \reg.exe - OriginalFileName: reg.exe selection_reg_flag: CommandLine|contains: add selection_keys: CommandLine|contains: - Control Panel\Desktop - CurrentVersion\Policies\ActiveDesktop - CurrentVersion\Policies\System selection_cli_reg_1: CommandLine|contains|all: - /v NoChangingWallpaper - /d 1 selection_cli_reg_2: CommandLine|contains|all: - /v Wallpaper - /t REG_SZ selection_cli_reg_3: CommandLine|contains|all: - /v WallpaperStyle - /d 2 condition: all of selection_reg_* and selection_keys and 1 of selection_cli_reg_* falsepositives: - Administrative scripts that change the desktop background to a company logo or other image. level: medium
Near-miss passage: Sigma rule: Detects loading of a DLL by the VMware Xfer utility from the non-default directory which may be an attempt to sideload a. Logsource: windows / image_load. Rule: title: Potential DLL Sideloading Via VMware Xfer id: 9313dc13-d04c-46d8-af4a-a930cc55d93b status: test description: Detects loading of a DLL by the VMware Xfer utility from the non-default directory which may be an attempt to sideload arbitrary DLL references: - https://www.sentinelone.com/labs/lockbit-ransomware-side-loads-cobalt-strike-beacon-with-legitimate-vmware-utility/ author: Nasreddine Bencherchali (Nextron Systems) date: 2022-08-02 modified: 2023-02-17 tags: - attack.privilege-escalation - attack.persistence - attack.execution - attack.stealth - attack.t1574.001 logsource: product: windows category: image_load detection: selection: Image|endswith: \VMwareXferlogs.exe ImageLoaded|endswith: \glib-2.0.dll filter: ImageLoaded|startswith: C:\Program Files\VMware\ condition: selection and not filter falsepositives: - Unlikely level: high