khi xâm nhập được vào hệ thống có shell(shell gì thì tùy các bạn) và tùy vào mỗi os mà chúng ta xâm nhập mà thực thi lệnh,sau đây là một số lệnh cơ bản khi attack vào hệ thống có shell

đối với linux

cat ./../mainfile.php - Config file.
ls -la - Lists directory's.
ifconfig {eth0 etc} - Ipconfig equiv.
ps aux - Show running proccess's.
gcc in_file -o out_file - Compile c file.
cat /etc/passwd - List's accounts.
sudo - Superuser Do run a command as root provided you have perms in /etc/sudoers.
id - Tells you what user your logged in as.
which wget curl w3m lynx - Check's to see what downloaders are present.
uname -r - Shows all release info (or) cat /etc/release.
uname -a - Shows all kernal info (or) cat /etc/issue
last -30 - Last logged 30 ip's can change to desired number.
useradd - Create new user account.
usermod - Modify user account.
w - See who is currently logged on.
locate password.txt - Locates password.txt in current dur can use *.
rm -rf / - Please be carefull with this command, i cannot stress this enough.
arp -a - Lists other machines are on the same subnet.
lsattr -va - ls file attributes on linux second extended file system
find / -type f -perm -04000 -ls - Finds suid files.
find . -type f -perm -04000 -ls - Finds suid files in current dir.
find / -type f -perm -02000 -ls - Finds all sgid files.
find / -perm -2 -ls - Finds all writable files and folders.
find . -perm -2 -ls - Finds all writable files and folders in current dir.
find / -type f -name .bash_history - Finds bash history.
netstat -an | grep -i listen - shows open ports.
cut -d: -f1,2,3 /etc/passwd | grep :: - From memory creates a user with no pass.
find /etc/ -type f -perm -o+w 2> /dev/null - Write in /etc/passwd?.
cat /proc/version /proc/cpuinfo - Cpu info.
locate gcc- Finds gcc if installed.
set - Display system variables.
echo $path- Echo current path.
lsmod- Dumps kernal modules.
mount/df- Check mounted file system.
rpm -qa- Check patch level for RedHat 7.0.
dmesg- Check hardware ino.
cat /etc/syslog.conf - Log file.
uptime - Uptime check.
cat /proc/meminfo - Memory check.
find / -type f -perm -4 -print 2> /dev/null- Find readble files.
find / -type f -perm -2 -print 2> /dev/null - Find writable files.
chmod ### $folder - Chmod folder.
ls -l -b - Verbosly list directory's
đối với windows

ADDUSERS Add or list users to/from a CSV file
ARP Address Resolution Protocol
ASSOC Change file extension associations
ASSOCIAT One step file association
AT Schedule a command to run at a later time
ATTRIB Change file attributes

BOOTCFG Edit Windows boot settings
BROWSTAT Get domain, browser and PDC info

CACLS Change file permissions
CALL Call one batch program from another
CHANGE Change Terminal Server Session properties
CHKDSK Check Disk - check and repair disk problems
CHKNTFS Check the NTFS file system
CHOICE Accept keyboard input to a batch file
CIPHER Encrypt or Decrypt files/folders
CleanMgr Automated cleanup of Temp files, recycle bin
CLEARMEM Clear memory leaks
CLIP Copy STDIN to the Windows clipboard.
CLS Clear the screen
CLUSTER Windows Clustering
CMD Start a new CMD shell
COLOR Change colours of the CMD window
COMP Compare the contents of two files or sets of files
COMPACT Compress files or folders on an NTFS partition
COMPRESS Compress individual files on an NTFS partition
CON2PRT Connect or disconnect a Printer
CONVERT Convert a FAT drive to NTFS.
CSVDE Import or Export Active Directory data

DATE Display or set the date
Dcomcnfg DCOM Configuration Utility
DEFRAG Defragment hard drive
DELPROF Delete NT user profiles
DELTREE Delete a folder and all subfolders
DevCon Device Manager Command Line Utility
DIR Display a list of files and folders
DIRUSE Display disk usage
DISKCOMP Compare the contents of two floppy disks
DISKCOPY Copy the contents of one floppy disk to another
DNSSTAT DNS Statistics
DOSKEY Edit command line, recall commands, and create macros
DSADD Add user (computer, group..) to active directory
DSQUERY List items in active directory
DSMOD Modify user (computer, group..) in active directory

ECHO Display message on screen
ENDLOCAL End localisation of environment changes in a batch file
ERASE Delete one or more files
EXIT Quit the CMD shell
EXPAND Uncompress files
EXTRACT Uncompress CAB files

FC Compare two files
FDISK Disk Format and partition
FIND Search for a text string in a file
FINDSTR Search for strings in files
FOR Conditionally perform a command several times
FORFILES Batch process multiple files
FORMAT Format a disk
FREEDISK Check free disk space (in bytes)
FSUTIL File and Volume utilities
FTP File Transfer Protocol
FTYPE Display or modify file types used in file extension associations

GLOBAL Display membership of global groups
GOTO Direct a batch program to jump to a labelled line

HELP Online Help
HFNETCHK Network Security Hotfix Checker

IF Conditionally perform a command
IFMEMBER Is the current user in an NT Workgroup

KILL Remove a program from memory

LABEL Edit a disk label
LOCAL Display membership of local groups
LOGEVENT Write text to the NT event viewer.
LOGOFF Log a user off
LOGTIME Log the date and time in a file

MAPISEND Send email from the command line
MEM Display memory usage
MD Create new folders
MODE Configure a system device
MORE Display output, one screen at a time
MOUNTVOL Manage a volume mount point
MOVE Move files from one folder to another
MOVEUSER Move a user from one domain to another
MSG Send a message
MSIEXEC Microsoft Windows Installer
MSINFO Windows NT diagnostics
MSTSC Terminal Server Connection (Remote Desktop Protocol)
MUNGE Find and Replace text within file(s)

NET Manage network resources
NETDOM Domain Manager
NETSH Configure network protocols
NETSVC Command-line Service Controller
NBTSTAT Display networking statistics (NetBIOS over TCP/IP)
NETSTAT Display networking statistics (TCP/IP)
NOW Display the current Date and Time
NSLOOKUP Name server lookup
NTBACKUP Backup folders to tape
NTRIGHTS Edit user account rights

PATH Display or set a search path for executable files
PATHPING Trace route plus network latency and packet loss
PAUSE Suspend processing of a batch file and display a message
PERMS Show permissions for a user
PERFMON Performance Monitor
PING Test a network connection
PORTQRY Display the status of ports and services
PRINT Print a text file
PRNCNFG Display, configure or rename a printer
PRNMNGR Add, delete, list printers set the default printer
PROMPT Change the command prompt

QGREP Search file(s) for lines that match a given pattern.

RASDIAL Manage RAS connections
RASPHONE Manage RAS connections
RECOVER Recover a damaged file from a defective disk.
REG Read, Set or Delete registry keys and values
REGEDIT Import or export registry settings
REGSVR32 Register or unregister a DLL
REGINI Change Registry Permissions
REM Record comments (remarks) in a batch file
REN Rename a file or files.
REPLACE Replace or update one file with another
RD Delete folder(s)
RDISK Create a Recovery Disk
RMTSHARE Share a folder or a printer
ROBOCOPY Robust File and Folder Copy
ROUTE Manipulate network routing tables
RUNAS Execute a program under a different user account
RUNDLL32 Run a DLL command (add/remove print connections)

SC Service Control
SCHTASKS Create or Edit Scheduled Tasks
SCLIST Display NT Services
ScriptIt Control GUI applications
SET Display, set, or remove environment variables
SETLOCAL Begin localisation of environment changes in a batch file
SETX Set environment variables permanently
SHARE List or edit a file share or print share
SHIFT Shift the position of replaceable parameters in a batch file
SHORTCUT Create a windows shortcut (.LNK file)
SHOWGRPS List the NT Workgroups a user has joined
SHOWMBRS List the Users who are members of a Workgroup
SHUTDOWN Shutdown the computer
SLEEP Wait for x seconds
SOON Schedule a command to run in the near future
SORT Sort input
START Start a separate window to run a specified program or command
SU Switch User
SUBINACL Edit file and folder Permissions, Ownership and Domain
SUBST Associate a path with a drive letter
SYSTEMINFO List system configuration

TASKLIST List running applications and services
TIME Display or set the system time
TIMEOUT Delay processing of a batch file
TITLE Set the window title for a CMD.EXE session
TOUCH Change file timestamps
TRACERT Trace route to a remote host
TREE Graphical display of folder structure
TYPE Display the contents of a text file

USRSTAT List domain usernames and last login

VER Display version information
VERIFY Verify that files have been saved
VOL Display a disk label

WHERE Locate and display files in a directory tree
WHOAMI Output the current UserName and domain
WINDIFF Compare the contents of two files or sets of files
WINMSD Windows system diagnostics
WINMSDP Windows system diagnostics II
WMIC WMI Commands

XCACLS Change file permissions
XCOPY Copy files and folders