DarkWidow – A Stealthy Windows Dropper And Post-Exploitation Tool

A formidable tool tailored for both dropper and post-exploitation scenarios on Windows systems.

With its sophisticated capabilities including dynamic syscall invocation, process injection, and PPID spoofing, DarkWidow emerges as a potent weapon in the arsenal of cyber adversaries. This article delves into its functionalities, compile instructions, and evasion tactics, shedding light on its intricate workings and potential implications for cybersecurity.

Chnage The Badge Year

This is a Dropper/PostExploitation Tool (or can be used in both situations) targeting Windows.

Capabilities

1. Indirect Dynamic Syscall
2. SSN + Syscall address sorting via Modified TartarusGate approach
3. Remote Process Injection via APC Early Bird (MITRE ATT&CK TTP: T1055.004)
4. Spawns a sacrificial Process as the target process
5. ACG(Arbitrary Code Guard)/BlockDll mitigation policy on spawned process
6. PPID spoofing (MITRE ATT&CK TTP: T1134.004)
7. Api resolving from TIB (Directly via offset (from TIB) -> TEB -> PEB -> resolve Nt Api) (MITRE ATT&CK TTP: T1106)
8. Cursed Nt API hashing

Bonus : If blessed With Admin privilege =>

1. Disables Event Log via killing EventLog Service Threads (MITRE ATT&CK TTP: T1562.002)

So, thought of killing them instead!

While Killing only those threads in the indirect syscall implant, was facing an error. I was unable to get the “eventlog” SubProcessTag Value. So thought of killing all threads, i.e. killing the whole process (responsible svchost.exe). Yeah creating an IOC!.

=

1. EDR/Ring-3/UserLand hook Bypass

2. The syscall and return statement are executed from memory of ntdll.dll

3. EDR detection based on checking the return address in the call stack can be bypassed.

Compile:

1.

Directly via VS compiler:

Also add /MT compiler flag! => To statically links CRT functions together in a binary (Yeah, U guessed it, it bloats the implant)

2. Also via compile.bat (prefer option 1.)

./compile.bat

Usage

PS C:> .\x64\Release\indirect.exe
[!] Wrong!
[->] Syntax: .\x64\Release\indirect.exe <PPID to spoof>

Successful Execution WithOut Creating Alert on Sofos XDR EndPoint:

For more information click here.