Query: write Sigma for Detects suspicious shell commands or program code that may be executed or used in command line to establish a reverse sh
Matching passage: Sigma rule: Detects suspicious shell commands or program code that may be executed or used in command line to establish a reverse sh. Logsource: linux. Rule: title: Suspicious Reverse Shell Command Line id: 738d9bcf-6999-4fdb-b4ac-3033037db8ab status: test description: Detects suspicious shell commands or program code that may be executed or used in command line to establish a reverse shell references: - https://alamot.github.io/reverse_shells/ author: Florian Roth (Nextron Systems) date: 2019-04-02 modified: 2021-11-27 tags: - attack.execution - attack.t1059.004 logsource: product: linux detection: keywords: - BEGIN {s = "/inet/tcp/0/ - bash -i >& /dev/tcp/ - bash -i >& /dev/udp/ - sh -i >$ /dev/udp/ - sh -i >$ /dev/tcp/ - '&& while read line 0<&5; do' - /bin/bash -c exec 5<>/dev/tcp/ - /bin/bash -c exec 5<>/dev/udp/ - 'nc -e /bin/sh ' - /bin/sh | nc - 'rm -f backpipe; mknod /tmp/backpipe p && nc ' - ;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))) - ;STDIN->fdopen($c,r);$~->fdopen($c,w);system$_ while<>; - /bin/sh -i <&3 >&3 2>&3 - uname -a; w; id; /bin/bash -i - $sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2); $stream.Write($sendbyte,0,$sendbyte.Length); $stream.Flush()}; - ;os.dup2(s.fileno(),0);os.dup2(s.fileno(),1);os.dup2(s.fileno(),2);os.putenv('HISTFILE','/dev/null'); - .to_i;exec sprintf("/bin/sh -i <&%d >&%d 2>&%d",f,f,f) - ;while(cmd=c.gets);IO.popen(cmd,"r"){|io|c.print - 'socat exec:''bash -li'',pty,stderr,setsid,sigint,sane tcp:' - rm -f /tmp/p; mknod /tmp/p p && - ' | /bin/bash | telnet ' - ',echo=0,raw tcp-listen:' - 'nc -lvvp ' - xterm -display 1 condition: keywords falsepositives: - Unknown level: high
Near-miss passage: Sigma rule: Detects suspicious activity where the WMIC process is used to create an autorun registry entry via reg.exe, which is oft. Logsource: windows / process_creation. Rule: title: Suspicious Autorun Registry Modified via WMI id: c80e66d8-1780-48a9-b412-46663fd21ac0 status: experimental description: 'Detects suspicious activity where the WMIC process is used to create an autorun registry entry via reg.exe, which is often indicative of persistence mechanisms employed by malware. ' references: - Internal Research - https://github.com/HackTricks-wiki/hacktricks/blob/e4c7b21b8f36c97c35b7c622732b38a189ce18f7/src/windows-hardening/windows-local-privilege-escalation/privilege-escalation-with-autorun-binaries.md author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2025-02-17 tags: - attack.privilege-escalation - attack.execution - attack.persistence - attack.t1547.001 - attack.t1047 logsource: category: process_creation product: windows detection: selection_execution_img: - Image|endswith: \wmic.exe - OriginalFileName: wmic.exe - ParentImage|endswith: \wmiprvse.exe selection_execution_cmd: CommandLine|contains|all: - reg - ' add ' CommandLine|contains: - \Software\Microsoft\Windows\CurrentVersion\Run - \Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run - \Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run selection_suspicious_paths_1: CommandLine|contains: - :\Perflogs - :\ProgramData' - :\Windows\Temp - :\Temp - \AppData\Local\Temp - \AppData\Roaming - :\$Recycle.bin - :\Users\Default - :\Users\public - '%temp%' - '%tmp%' - '%Public%' - '%AppData%' selection_suspicious_paths_user_1: CommandLine|contains: :\Users\ selection_suspicious_paths_user_2: CommandLine|contains: - \Favorites - \Favourites - \Contacts - \Music - \Pictures - \Documents - \Photos condition: all of selection_execution_* and (selection_suspicious_paths_1 or (all of selection_suspicious_paths_user_*)) falsepositives: - Legitimate administrative activity or software installations level: high