yehia-mamdouh/shell3erPowerShell-based reverse shell with background task execution, file transfer, and dual persistence mechanisms via registry and startup folder for red team operations.
Shell3er PowerShell Reverse Shell
Get-RandomProcessName Function
The Get-RandomProcessName function generates a random process name by concatenating "PS_" with a new GUID. This is used to create unique and seemingly random process names, making it harder to identify suspicious processes.
Run-BackgroundTask Function
The Run-BackgroundTask function accepts a ScriptBlock and an optional ProcessName as parameters. It then starts a new background job with a random job name, executes the script block, and retrieves the output. The main purpose of this function is to run tasks in the background without interfering with the main script.
Download and Upload Functions
The download and upload functions serve to transfer files between the client and the server. They use Base64 encoding to transmit the file data over the network. Errors, if encountered during the file transfer process, are sent back to the client.
Persistence Mechanisms
The script uses two different methods to achieve persistence on the target system. First, it copies itself to the "C:\ProgramData" folder and modifies the registry key "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" to start the script every time the user logs in. Second, it copies the script to the user's Startup folder, ensuring that it runs every time the user starts their system.
The Shell3er Tested Manually on the following Solutuions (Checkpoint EDR version E85.40) (Kaspersky Total Security) (Widdows Defender)
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