Query: detect Detects execution of netcat with the "-e" flag followed by common shells. This could be a sign of a potential reverse sh in logs
Matching passage: Sigma rule: Detects execution of netcat with the "-e" flag followed by common shells. This could be a sign of a potential reverse sh. Logsource: linux / process_creation. Rule: title: Potential Netcat Reverse Shell Execution id: 7f734ed0-4f47-46c0-837f-6ee62505abd9 status: test description: Detects execution of netcat with the "-e" flag followed by common shells. This could be a sign of a potential reverse shell setup. references: - https://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet - https://www.revshells.com/ - https://www.hackingtutorials.org/networking/hacking-netcat-part-2-bind-reverse-shells/ - https://www.infosecademy.com/netcat-reverse-shells/ - https://man7.org/linux/man-pages/man1/ncat.1.html author: '@d4ns4n_, Nasreddine Bencherchali (Nextron Systems)' date: 2023-04-07 tags: - attack.execution - attack.t1059 logsource: category: process_creation product: linux detection: selection_nc: Image|endswith: - /nc - /ncat selection_flags: CommandLine|contains: - ' -c ' - ' -e ' selection_shell: CommandLine|contains: - ' ash' - ' bash' - ' bsh' - ' csh' - ' ksh' - ' pdksh' - ' sh' - ' tcsh' - /bin/ash - /bin/bash - /bin/bsh - /bin/csh - /bin/ksh - /bin/pdksh - /bin/sh - /bin/tcsh - /bin/zsh - $IFSash - $IFSbash - $IFSbsh - $IFScsh - $IFSksh - $IFSpdksh - $IFSsh - $IFStcsh - $IFSzsh condition: all of selection_* falsepositives: - Unlikely level: high
Near-miss passage: Sigma rule: Detects potentially suspicious child processes of "Diskshadow.exe". This could be an attempt to bypass parent/child rela. Logsource: windows / process_creation. Rule: title: Potentially Suspicious Child Process Of DiskShadow.EXE id: 9f546b25-5f12-4c8d-8532-5893dcb1e4b8 related: - id: fa1a7e52-3d02-435b-81b8-00da14dd66c1 type: similar - id: 1dde5376-a648-492e-9e54-4241dd9b0c7f type: similar - id: 56b1dde8-b274-435f-a73a-fb75eb81262a type: similar - id: 0c2f8629-7129-4a8a-9897-7e0768f13ff2 type: similar status: test description: Detects potentially suspicious child processes of "Diskshadow.exe". This could be an attempt to bypass parent/child relationship detection or application whitelisting rules. references: - https://bohops.com/2018/03/26/diskshadow-the-return-of-vss-evasion-persistence-and-active-directory-database-extraction/ - https://www.ired.team/offensive-security/credential-access-and-credential-dumping/ntds.dit-enumeration - https://medium.com/@cyberjyot/lolbin-execution-via-diskshadow-f6ff681a27a4 - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/diskshadow - https://www.lifars.com/wp-content/uploads/2022/01/GriefRansomware_Whitepaper-2.pdf - https://www.zscaler.com/blogs/security-research/technical-analysis-crytox-ransomware - https://research.checkpoint.com/2022/evilplayout-attack-against-irans-state-broadcaster/ author: Nasreddine Bencherchali (Nextron Systems) date: 2023-09-15 tags: - attack.stealth - attack.t1218 logsource: category: process_creation product: windows detection: selection: ParentImage|endswith: \diskshadow.exe Image|endswith: - \certutil.exe - \cscript.exe - \mshta.exe - \powershell.exe - \pwsh.exe - \regsvr32.exe - \rundll32.exe - \wscript.exe condition: selection falsepositives: - False postitve can occur in cases where admin scripts levreage the "exec" flag to execute applications level: medium