![]() This means that the file is not a legitimate Windows system file and is malicious.įurthermore, a legitimate SIHCLient.exe process (SIH Client) does not have an icon beside it when running in Task Manager. Some files have names similar to SIHCLient.exe, for example, sihclient.exe (the filename is case-sensitive), or they have identical names but not placed not in the correct directory (" \Windows\System32\"). Unfortunately, malware developers can take advantage of this and have their malicious programs identified as harmless files. These actions might result in loss of important operating system components/files, however, these cases are often reported and anti-virus software developers update their databases immediately. As a consequence, legitimate files (such as SIHCLient.exe) are detected as malicious and are often removed. Typically, anti-virus (and other similar) programs provide false positive results due to mistakes in malware databases - when these databases contain misleading information. Therefore, various anti-virus programs often recognize the legitimate SIHCLient.exe process as a threat and provide users with 'false positive' results. In many cases, cyber criminals use this name and disguise malicious programs (processes) as sihclient.exe. This genuine system file is placed in the " \Windows\System32\" folder. The way Spigot handles the login handshake packets is is a genuine Windows process that can be found running in Task Manager under the " SIH Client" name when the operating system starts fixing components required for automatic Windows updates. UUID spoofing is not a bug in the server software or protocol. This means that only the Bungeecord server can access those servers, and noone outside the network. One of the ways to protect your server from UUID spoofing, is by hosting all sub servers locally. Here's a list of some of the clients that has the UUID spoof feature: Some modified hacked clients has a UUID spoof feature built in. Read more about the handshake packet at: Īll player data are bound to players UUID which means you'll have the same permissions, rank, inventory items etc. In the spoofed UUIDv4 field you put in the UUID of an operator on the server. This can be used to make you roughly untraceable. address field can be spoofed to any IP-address you want (yes even '0.0.0.0' and '127.0.0.1'). AnalysisĪs mentioned, all sub servers are in offline mode, which means Mojang doesn't check your username and session ID when logging on to the server, and because of this, you can log into the server using any user's UUID you want by modifying the handshake packet sent when logging into the server. Online mode means there's an authentication process on login, to make sure players are using valid sessions (accounts they logged into). ![]() Offline mode means no Mojang session authentication on login, which means you can log into the server using any username you want (sometimes even usernames with characters like $, #, ? etc.). The proxy is the only server that is in online mode by default to make sure players can't login using cracked accounts (accounts that doesn't exist or has an invalid session). The sub servers has to be in offline mode in order to make the Bungeecord system work. To understand how UUID spoofing works, we need to take a look at how Bungeecord works.Ī Bungeecord network consists of a proxy server and sub servers. In the real world, we have the same identification system to identify individuals called SSN (Social Security Number). ![]() UUID stands for "Unique User IDentifier" which is the ID used to identify a player. This exploit is one of the most used methods to gain administrator privileges on vulnerable Minecraft networks. UUID spoofing was first discovered in early 2013, and is now a well-known Bungeecord vulnerability - mainly abused to grief servers. ![]()
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