Query: write Sigma for Detects the execution of Notepad to open a file that has the string "password" which may indicate unauthorized access to
Matching passage: Sigma rule: Detects the execution of Notepad to open a file that has the string "password" which may indicate unauthorized access to. Logsource: windows / process_creation. Rule: title: Notepad Password Files Discovery id: 3b4e950b-a3ea-44d3-877e-432071990709 status: experimental description: Detects the execution of Notepad to open a file that has the string "password" which may indicate unauthorized access to credentials or suspicious activity. references: - https://thedfirreport.com/2025/02/24/confluence-exploit-leads-to-lockbit-ransomware/ - https://intel.thedfirreport.com/eventReports/view/57 author: The DFIR Report tags: - attack.discovery - attack.t1083 date: 2025-02-21 logsource: product: windows category: process_creation detection: selection: ParentImage|endswith: \explorer.exe Image|endswith: \notepad.exe CommandLine|endswith: - password*.txt - password*.csv - password*.doc - password*.xls condition: selection falsepositives: - Legitimate use of opening files from remote hosts by administrators or users. However, storing passwords in text readable format could potentially be a violation of the organization's policy. Any match should be investigated further. level: low
Near-miss passage: Sigma rule: Shadow Copies deletion using operating systems utilities. Logsource: windows / process_creation. Rule: title: Shadow Copies Deletion Using Operating Systems Utilities id: c947b146-0abc-4c87-9c64-b17e9d7274a2 status: stable description: Shadow Copies deletion using operating systems utilities references: - https://www.slideshare.net/heirhabarov/hunting-for-credentials-dumping-in-windows-environment - https://blog.talosintelligence.com/2017/05/wannacry.html - https://securingtomorrow.mcafee.com/other-blogs/mcafee-labs/new-teslacrypt-ransomware-arrives-via-spam/ - https://www.bleepingcomputer.com/news/security/why-everyone-should-disable-vssadmin-exe-now/ - https://www.hybrid-analysis.com/sample/ed01ebfbc9eb5bbea545af4d01bf5f1071661840480439c6e5babe8e080e41aa?environmentId=100 - https://github.com/Neo23x0/Raccine#the-process - https://github.com/Neo23x0/Raccine/blob/20a569fa21625086433dcce8bb2765d0ea08dcb6/yara/gen_ransomware_command_lines.yar - https://redcanary.com/blog/intelligence-insights-october-2021/ - https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/blackbyte-exbyte-ransomware author: Florian Roth (Nextron Systems), Michael Haag, Teymur Kheirkhabarov, Daniil Yugoslavskiy, oscd.community, Andreas Hunkeler (@Karneades) date: 2019-10-22 modified: 2022-11-03 tags: - attack.impact - attack.stealth - attack.t1070 - attack.t1490 logsource: category: process_creation product: windows detection: selection1_img: - Image|endswith: - \powershell.exe - \pwsh.exe - \wmic.exe - \vssadmin.exe - \diskshadow.exe - OriginalFileName: - PowerShell.EXE - pwsh.dll - wmic.exe - VSSADMIN.EXE - diskshadow.exe selection1_cli: CommandLine|contains|all: - shadow - delete selection2_img: - Image|endswith: \wbadmin.exe - OriginalFileName: WBADMIN.EXE selection2_cli: CommandLine|contains|all: - delete - catalog - quiet selection3_img: - Image|endswith: \vssadmin.exe - OriginalFileName: VSSADMIN.EXE selection3_cli: CommandLine|contains|all: - resize - shadowstorage CommandLine|contains: - unbounded - /MaxSize= condition: (all of selection1*) or (all of selection2*) or (all of selection3*) falsepositives: - Legitimate Administrator deletes Shadow Copies using operating systems utilities for legitimate reason - LANDesk LDClient Ivanti-PSModule (PS EncodedCommand) level: high