Query: Sigma rule for Detect the usage of "DirLister.exe" a utility for quickly listing folder or drive contents. It was seen used by BlackCat
Matching passage: Sigma rule: Detect the usage of "DirLister.exe" a utility for quickly listing folder or drive contents. It was seen used by BlackCat. Logsource: windows / process_creation. Rule: title: DirLister Execution id: b4dc61f5-6cce-468e-a608-b48b469feaa2 status: test description: Detect the usage of "DirLister.exe" a utility for quickly listing folder or drive contents. It was seen used by BlackCat ransomware to create a list of accessible directories and files. references: - https://github.com/redcanaryco/atomic-red-team/blob/40b77d63808dd4f4eafb83949805636735a1fd15/atomics/T1083/T1083.md - https://news.sophos.com/en-us/2022/07/14/blackcat-ransomware-attacks-not-merely-a-byproduct-of-bad-luck/ author: frack113 date: 2022-08-20 modified: 2023-02-04 tags: - attack.discovery - attack.t1083 logsource: category: process_creation product: windows detection: selection: - OriginalFileName: DirLister.exe - Image|endswith: \DirLister.exe condition: selection falsepositives: - Legitimate use by users level: low regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_dirlister_execution/info.yml simulation: - type: atomic-red-team name: Launch DirLister Executable technique: T1083 atomic_guid: c5bec457-43c9-4a18-9a24-fe151d8971b7
Near-miss 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