Hackers invite links to redirect users to redirect users to redirect the discords to redirect remote access and information-dictation malware to redirect users to redirect users.
The campaign depends on a defect in the Discard Invitation System to take advantage of multi-stage infections that avoid many antivirus engines.
The “revived” expires discord invites
Discord invited links are URLs that allow someone to join a specific discord server. They have an invitation code, which is a unique identifier that provides access to a server and the temporary, permanent or custom -vanity link available for the ‘Level 3’ server paid for special allowances.
As part of allowances for level 3 discord server, administrators can create an individual invitation code. For a regular server, the discord automatically produces random invitation links and the possibility of repeating one is very low.
However, the hackers noticed that when a level 3 server loses its boost status, the custom invit code is available and it can be rectified by another server.
Researchers at Czech Point of Cyber Security Company say it is also true in the case of expired temporary invitation or permanent invitation links.
They say that “the mechanism to create custom invited links surprisingly lets you reuse temporary invited code, and, in some cases, permanent invitation codes were removed.”
Source: Check Point
Additionally, researchers say that the defective mechanism of the discord does not modify the expiry time of the already generated temporary invitation code when reusing as a permanent invitation link.
“Users often accidentally believe that by just examining this box, they have made the existing invitation permanent (and it was misunderstanding we exploited in the attack we saw) -” – -” – -” – Check point
An invited code with lowercase letters and digits cannot be registered until it is active. However, if the code contains the uppercase letters, it can be reused in the proud link with the lowercase, even if the original is still valid.
Czech point researchers explain that this is possible because the discord stores and compare the boast link in the lowercase. As a result, the same code with lower and uppercase letters is valid for two different servers at the same time.
Redirect
The attackers are monitoring removed or expired discord invitations and are using them in a campaign, affecting 1,300 users in the US, UK, France, Netherlands and Germany, based on the Czech point download count of malicious payloads.
Researchers say that cyber criminals are kidnapping, inviting links from legitimate communities, and share them on social media or official comony websites. To add reliability to deception, hackers design malicious servers to look authentic.
The malicious discord server shows a single channel only for the visitor, #Verife, and a bot is inspired to undergo a verification process.
Source: Check Point
The attempt to do this begins a specific ‘clickfix’ attack, where the user is redirected to a website that mimics the discord UI and shows that the captcha failed to load.
Users are cheated manually in opening Windows run dialogues and paste a Powershell command, which they had already copied to the clipboard for execution.
Source: Check Point
By doing this, there is a multi-phase infection that includes powerrashel downloaders, obfusted C ++ loaders and VBSCripT files.
The final payload is downloaded from valid bitbacket software cooperation and file hosting service, and includes:
- Partial: Distributed as ‘ACLIENT.EXE’, it is 0.5.8 version of malware that uses pastebin to bring its C2 address dynamically. Its capabilities include file operations, kelogging and webcam/microphone access
- Sculled steeler,
- Cromcatz: A custom version of the open-source tool, given as ‘cks.exe’, which can steal cookies and passwords
Researchers discovered that a scheduled work is also added to the host to re -run the malware loader every five minutes.
Source: Check Point
To defend against this danger, it is recommended that discord users refrain from relying on old invited links, especially from months old positions, treat “verification” requests with additional precautions, and never run copied powercare commands that you don’t fully understand.
Additionally, discord server administrators are recommended to use permanent invitations, which are more difficult for kidnapping.
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