Backdoor.Win32.Onalf Missing Authentication

Backdoor.Win32.Onalf malware has a backdoor running on TCP/2020 that does not require any authentication.

MD5 | 8413023933171cccf3cf8f346fc00dc6

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

Threat: Backdoor.Win32.Onalf
Vulnerability: Missing Authentication
Description: WinRemoteShell (Onalf) listens for commands on TCP port 2020. Interestingly, it will only start listening once it can connect outbound to SMTP port 25. Not much of a self respecting backdoor, as it allows anyone to logon without requiring a password. After logon you are greeted with Welcome to WinRemoteShell(c)Chernickevich
Type: PE32
MD5: ba815d409cd714c0eac010b5970f6408
Vuln ID: MVID-2021-0042
Disclosure: 01/20/2021

TELNET x.x.x.x 2020

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