Query: alert when Detects a highly relevant Antivirus alert that reports a web shell. It's highly recommended to tune this rule to the spe
Matching passage: Sigma rule: Detects a highly relevant Antivirus alert that reports a web shell. It's highly recommended to tune this rule to the spe. Logsource: antivirus. Rule: title: Antivirus - Web Shell Detection Signature id: fdf135a2-9241-4f96-a114-bb404948f736 status: test description: 'Detects a highly relevant Antivirus alert that reports a web shell. It''s highly recommended to tune this rule to the specific strings used by your anti virus solution by downloading a big WebShell repository from e.g. github and checking the matches. This event must not be ignored just because the AV has blocked the malware but investigate, how it came there in the first place. ' references: - https://www.nextron-systems.com/?s=antivirus - https://github.com/tennc/webshell - https://www.virustotal.com/gui/file/bd1d52289203866645e556e2766a21d2275877fbafa056a76fe0cf884b7f8819/detection - https://www.virustotal.com/gui/file/308487ed28a3d9abc1fec7ebc812d4b5c07ab025037535421f64c60d3887a3e8/detection - https://www.virustotal.com/gui/file/7d3cb8a8ff28f82b07f382789247329ad2d7782a72dde9867941f13266310c80/detection - https://www.virustotal.com/gui/file/e841675a4b82250c75273ebf0861245f80c6a1c3d5803c2d995d9d3b18d5c4b5/detection - https://www.virustotal.com/gui/file/a80042c61a0372eaa0c2c1e831adf0d13ef09feaf71d1d20b216156269045801/detection - https://www.virustotal.com/gui/file/b219f7d3c26f8bad7e175934cd5eda4ddb5e3983503e94ff07d39c0666821b7e/detection - https://www.virustotal.com/gui/file/b8702acf32fd651af9f809ed42d15135f842788cd98d81a8e1b154ee2a2b76a2/detection - https://www.virustotal.com/gui/file/13ae8bfbc02254b389ab052aba5e1ba169b16a399d9bc4cb7414c4a73cd7dc78/detection author: Florian Roth (Nextron Systems), Arnim Rupp date: 2018-09-09 modified: 2026-06-29 tags: - attack.persistence - attack.t1505.003 logsource: category: antivirus detection: selection: - Signature|startswith: - ASP. - IIS/BackDoor - JAVA/Backdoor - JSP. - Perl. - PHP. - Troj/ASP - Troj/JSP - Troj/PHP - VBS/Uxor - Signature|contains: - ASP_ - 'ASP:' - ASP.Agent - ASP/ - Aspdoor - ASPXSpy - Backdoor.ASP - Backdoor.Java - Backdoor.JSP - Backdoor.PHP - Backdoor.VBS - Backdoor/ASP - Backdoor/Java - Backdoor/JSP - Backdoor/PHP - Backdoor/VBS - C99shell - Chopper - filebrowser - JSP_ - 'JSP:' - JSP.Agent - JSP/ - 'Perl:' - Perl/ - PHP_ - 'PHP:' - PHP.Agent - PHP/ - PHPShell - PShlSpy - SinoChoper - Trojan.ASP - Trojan.JSP - Trojan.PHP - Trojan.VBS - VBS.Agent - VBS/Agent - Webshell condition: selection falsepositives: - Unlikely level: high
Near-miss passage: Sigma rule: Detects suspicious activities as declared by Florian Roth in its 'Best Practice Auditd Configuration'. This includes the. Logsource: linux / auditd. Rule: title: Suspicious C2 Activities id: f7158a64-6204-4d6d-868a-6e6378b467e0 status: test description: 'Detects suspicious activities as declared by Florian Roth in its ''Best Practice Auditd Configuration''. This includes the detection of the following commands; wget, curl, base64, nc, netcat, ncat, ssh, socat, wireshark, rawshark, rdesktop, nmap. These commands match a few techniques from the tactics "Command and Control", including not exhaustively the following; Application Layer Protocol (T1071), Non-Application Layer Protocol (T1095), Data Encoding (T1132) ' references: - https://github.com/Neo23x0/auditd author: Marie Euler date: 2020-05-18 modified: 2021-11-27 tags: - attack.command-and-control logsource: product: linux service: auditd definition: 'Required auditd configuration: -w /usr/bin/wget -p x -k susp_activity -w /usr/bin/curl -p x -k susp_activity -w /usr/bin/base64 -p x -k susp_activity -w /bin/nc -p x -k susp_activity -w /bin/netcat -p x -k susp_activity -w /usr/bin/ncat -p x -k susp_activity -w /usr/bin/ss -p x -k susp_activity -w /usr/bin/netstat -p x -k susp_activity -w /usr/bin/ssh -p x -k susp_activity -w /usr/bin/scp -p x -k susp_activity -w /usr/bin/sftp -p x -k susp_activity -w /usr/bin/ftp -p x -k susp_activity -w /usr/bin/socat -p x -k susp_activity -w /usr/bin/wireshark -p x -k susp_activity -w /usr/bin/tshark -p x -k susp_activity -w /usr/bin/rawshark -p x -k susp_activity -w /usr/bin/rdesktop -p x -k susp_activity -w /usr/local/bin/rdesktop -p x -k susp_activity -w /usr/bin/wlfreerdp -p x -k susp_activity -w /usr/bin/xfreerdp -p x -k susp_activity -w /usr/local/bin/xfreerdp -p x -k susp_activity -w /usr/bin/nmap -p x -k susp_activity (via https://github.com/Neo23x0/auditd/blob/ddf2603dbc985f97538d102f13b4e4446b402bae/audit.rules#L336) ' detection: selection: key: susp_activity condition: selection falsepositives: - Admin or User activity level: medium