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According to researchers at Kaspersky, they potentially affect , web-accessible servers in systems that use the code. X and TurboVNC, which are actively used in automated industrial facilities to enable remote control of systems, according to the firm. Approximately 32 percent of industrial network computers having some form of remote administration tools , including VNC.
Kasperksy found vulnerabilities not only in the client, but also on the server-side of the system; many of the latter however can only be exploited after password authentication. A significant number of the problems detailed in the research were found and reported last year; however, each of the projects examined also had newly discovered bugs.
For instance, a newly found critical 9. The issue CVE exists because the stack frame is not protected with a stack canary. However, to exploit the bug, authorization on the server is required. This is also critical, with a CVSS rating of 9. In TightVNC code version 1. This can also potentially result RCE, Kaspersky found. It involves a memory leak exploitable via network connectivity in the VNC server code, which allows an attacker to read stack memory and can be abused for information disclosure.
Serial: SHA1: de3f5ce79effaf7e69c9cf3c28edf0c Issued: Expires: Common name: ip We further trace the apparent origins of Crelcom back to Simferopol, Crimea, as well. Within the last three months, we have identified 23 samples of this malware, twelve of which appear to have been shared by entities in Ukraine. The C2 domains in those samples include:.
Table 3. Recent file stealer C2 domains. As you can see, some of these domains were established months ago, yet despite their age, they continue to enjoy benign reputations. For example, only five out of 93 vendors consider the domain krashand[. Figure 7. VirusTotal results for krashand[.
Some of the subdomains follow a standardized pattern. For example, several of the domains use the first few letters of the alphabet a , b , c in a repeating combination. Conversely, jolotras[. We believe that these subdomains are dynamically generated by the file stealer when it first establishes a connection with its C2 server. As such, counting the number of subdomains associated with a particular C2 domain provides a rough gauge of the number of entities that have attempted to connect to the server.
However, it is important to also note that the number of pDNS entries can also be skewed by researchers and cybersecurity products that may be evaluating the malicious samples associated with a particular C2 domain. Table 4. Subdomain naming for file stealer infrastructure. In mapping these domains to their corresponding C2 infrastructure, we discovered that the domains overlap in terms of the IP addresses they point to.
This allowed us to identify the following active infrastructure:. Table 5. Recent file stealer IP infrastructure. Of note, all of the file stealer infrastructure appears to be hosted within AS, the same AS highlighted earlier. Historically, we have seen the C2 domains point to various autonomous systems AS globally. However, as of early November, it appears that the actors have consolidated all of their file stealer infrastructure within Russian ASs — predominantly this single AS.
In mapping the patterns involved in the use of this infrastructure, we found that the domains are rotated across IP addresses in a manner similar to the downloader infrastructure discussed previously. A malicious domain may point to one of the C2 server IP addresses today while pointing to a different address tomorrow.
This adds a degree of complexity and obfuscation that makes it challenging for network defenders to identify and remove the malware from infected networks. The discovery of a C2 domain in network logs thus requires defenders to search through their network traffic for the full collection of IP addresses that the malicious domain has resolved to over time. As an example, moolin[. Table 6. Shifting focus to the malware itself, file stealer samples connect to their C2 infrastructure in a unique manner.
Rather than connecting directly to a C2 domain, the malware performs a DNS lookup to convert the domain to an IP address. For example:. C2 Domain: moolin[. This technique of creating distance between the domain and the physical C2 infrastructure seems to be an attempt to bypass URL filtering:. One recent file stealer sample we analyzed SHA fe0ebedbb5de2bcf2fea6a0b6fefd16bf7ccd was found to be a. NET binary that had been obfuscated to make analysis more difficult.
The first thing that jumps out when reviewing these files are their sizes. This particular file clocks in at over MB in size, but we observed files going all the way up to MB and beyond. It is possible that this is an attempt to circumvent automated sandbox analysis, which usually avoids scanning such large files. It may also simply be a byproduct of the obfuscation tools being used. Whatever the reason for the large file size, it comes at a price to the attacker, as executables of this size stick out upon review.
Transmitting a file this large to a victim becomes a much more challenging task. The obfuscation within this sample is relatively simple and mainly relies upon defining arrays and concatenating strings of single characters in high volume over hundreds of lines to try to hide the construction of the actual string within the noise.
To identify the IP address of the C2 server, the file stealer will generate a random string of alphanumeric characters between eight and 23 characters long, such as 9lGocNmjxzWrDykSJbV. As mentioned previously, once the file stealer retrieves the IP address for this domain, it will no longer use the domain name. Instead, all communications will be direct with the IP address.
During execution, it will search all fixed and network drives attached to the computer for the following extensions:. When it has a list of files on the system, it begins to create a string for each that contains the path of the file, the size of the file and the last time the file was written to, similar to the example below:. The file stealer takes this string and generates an MD5 hash of it, resulting in the following output for this example:.
Next, it removes the hyphens from the hash and converts all uppercase letters to lowercase. The naming of this file is another attempt to hide in plain sight next to the legitimate IconCache. Table 7. All cluster 2 domains. The single remaining IP address related to the SSL certificate was not related to either cluster 1 or cluster 2, and instead led us to a third, distinct cluster of domains.
This final cluster appears to serve as the C2 infrastructure for a custom remote administration tool called Pteranodon. Gamaredon has used, maintained and updated development of this code for years. Its code contains anti-detection functions specifically designed to identify sandbox environments in order to thwart antivirus detection attempts. It is capable of downloading and executing files, capturing screenshots and executing arbitrary commands on compromised systems.
Over the last three months, we have identified 33 samples of Pteranodon. Pivoting across this cluster, we identified the following C2 infrastructure:. Table 8. Cluster 3 domains. An interesting naming pattern is seen in cluster 3 — also seen in some cluster 1 host and subdomain names. We see these actors using English words, seemingly grouped by the first two or three letters.
This pattern differs from those of cluster 2, but has been observed on some cluster 1 dropper domains, for example:. SHA 74cb6c1cbffce48f6b35c88bdbddfac85debdee. SHA ffb6d57ddff1bebccafa4d46bdfe1c0a Because we only see this with some domains, this may be a technique employed by a small group of actors or teams.
It suggests a possible link between the cluster 3 samples and those from cluster 1 employing a similar naming system. Gamaredon has been targeting Ukrainian victims for almost a decade. This blog serves to highlight the importance of research into adversary infrastructure and malware, as well as community collaboration, in order to detect and defend against nation-state cyberthreats. While we have mapped out three large clusters of currently active Gamaredon infrastructure, we believe there is more that remains undiscovered.
Unit 42 remains vigilant in monitoring the evolving situation in Ukraine and continues to actively hunt for indicators to put protections in place to defend our customers anywhere in the world. We encourage all organizations to leverage this research to hunt for and defend against this threat. The best defense against this evolving threat group is a security posture that favors prevention. We recommend that organizations implement the following:. For Palo Alto Networks customers, our products and services provide the following coverage associated with this campaign:.
Cortex XDR protects endpoints from the malware techniques described in this blog. WildFire cloud-based threat analysis service accurately identifies the malware described in this blog as malicious. Users of AutoFocus contextual threat intelligence service can view malware associated with these attacks using the Gamaredon Group tag.
Palo Alto Networks has shared these findings, including file samples and indicators of compromise, with our fellow Cyber Threat Alliance members. CTA members use this intelligence to rapidly deploy protections to their customers and to systematically disrupt malicious cyber actors. Learn more about the Cyber Threat Alliance. Additional IoCs shared in a Feb.
In some instances, the actor will shuffle files around within the archive to try to obfuscate what they are, but usually a command line switch can be found, similar to this: ;! The following files were included in this particular archive: SHA Filename fabf0d0fb3d53ded07b5fc8d1ba6eb8b3e1efa SSL Pivot to Additional Infrastructure and Samples While conducting historical research on the infrastructure in cluster 1, we discovered a self-signed certificate associated with cluster 1 IP address The C2 domains in those samples include: Domain First Seen jolotras[.
Subdomains [. Recent file stealer IP infrastructure Shifting focus to the malware itself, file stealer samples connect to their C2 infrastructure in a unique manner. For example: C2 Domain: moolin[. Figure 8. Figure 9. The malware uses this database to track unique files. Pteranodon Cluster 3 The single remaining IP address related to the SSL certificate was not related to either cluster 1 or cluster 2, and instead led us to a third, distinct cluster of domains.
Pivoting across this cluster, we identified the following C2 infrastructure: Domain Registered takak[. We again observe domain reputation aging, as seen in cluster 2. For example: deep-rooted.
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Long hostnames etc…. Instead of using the password as part of the encryption, we now check the password insite the encryption by the server. This allow the server to balcklist servers after x fault password. No protection against Brute force password hacking. And doesn't ask to reject the connection. UltraVNC 1. Supports Windows XP or later.
The message is used to prevent that timeouts close the connection. Files: ultravnc X64 setup. For example, you must install the client Viewer on one system and the Server on another, and both PCs must allow remote access. The online documentation includes screenshots but is a bit thin in places and assumes some knowledge on the user's part. Setup involves creating a password and allowing UltraVNC through your firewall when you first run the Server.
The Viewer also allows many options, such the level of access and control you want to allow, the display settings, and miscellaneous options such as disabling clipboard transfers. But we recommend keeping the default Auto Select Best Settings options, where they're available. You'll also need to configure each on the machine you'll be using, but it's possible to test your connections from your main PC by allowing loopback connections.
If you've got things set up properly, you'll see an endless "mirror-in-mirror" view of your screen. That's the hard part, actually, and once you have UltraVNC set up properly, establishing the remote connection is easy -- as easy as the Windows home networking feature, and much more powerful.
Who needs UltraVNC? Anyone who might need to access their work or home PC remotely, for starters. Software developers can use it to issue updates; Net admins can monitor and administer users' PCs remotely think about that the next time you have to go fix something simple on your mom's PC. Or take control of your home network. UltraVNC 64 bit is a free software that can display the screen of another computer via internet or network on your own screen.
The program allows you to use your mouse and keyboard to control the other PC remotely. It means that you can work on a remote computer, as if you were sitting in front of it, right from your current location. If you provide computer support, you can quickly access your customer's computers from anywhere in the world and resolve help-desk issues remotely.
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