Gootkit

Gootkit is an advanced banking trojan. It is extremely good at evading detection and has an incredibly effective persistence mechanism, making it a dangerous malware that researchers and organizations should be aware of.

Type
Trojan
Origin
Unknown
First seen
1 June, 2014
Last seen
21 October, 2021
Also known as
Waldek
Xswkit
Talalpek
Global rank
33
Week rank
21
Month rank
27
IOCs
1308
Last Seen at

What is Gootkit malware?

Gootkit is a banking Trojan – a malware created to steal banking credentials. In fact, Gootkit is classified as one top sophisticated banking Trojans ever created. It relies on complex anti-evasion and persistence mechanisms, as well as complex techniques like dynamic web injections.

Since its initial discovery in 2014, Gootkit has been utilized in multiple attacks that targeted bank accounts across Europe, some of which were very destructive.

Gootkit is known to affect the most widely used web-browsers, namely IE, Firefox, and Chrome. Interestingly, this trojan is coded mostly using the node.js programming language – not the first choice for most operators. What’s more, while many similar malicious programs heavily utilize leaked source code of older samples, the virus appears to be written almost 100% from scratch.

General description of Gootkit

The roots of this malware go all the way back to 2010 when what can be called the predecessor of Gootkit was first documented. Classified at the time as an information stealer which did not pose a significant danger, Gootkit has since evolved into a full-fledged banking Trojan.

The malware has been documented in its present form of a Trojan since 2014, involved in attacks targeting both private and corporate victims in Europe, mainly targeting banks in France and England. However, Spanish and Italian banks have also been reportedly attacked.

Unlike some other Trojans, Gootkit is not available for sale on the internet. Its code hasn’t been leaked, and a Russian-speaking group of hackers has carried out all attacks involving this malware.

Creators of this Trojan have implemented some of the most cutting-edge anti-evasion tricks to ensure the payload will stay hidden for as long as possible and prevent successful analysis by cybersecurity researchers. Comprised of two main parts, the dropper and the Trojan itself – the virus carries out sandbox checks on every stage of its life cycle. Meaning that both the dropper and the actual trojan have unique anti-evasion procedures.

Once the dropper makes its way into a machine, it will conduct the initial VM check, making sure that the malware is not being launched in a virtual environment. This is achieved by verifying the system’s processor value inside the Windows Registry by checking for specific names of virtual servers. In addition, BIOS is also checked to find any values which could point at the malware being launched on a VM. If the malware detects that it is not being launched on a real machine, it terminates all activities and connects to the control server to blacklist the endpoint it was launched in.

However, if the initial test is passed, the loader installs the main Gootkit executable, which, in turn, repeats some of the previous checks while adding several new ones. In one of the new checks, the malware checks the whitelist of names admissible for the CPU to determine that a VM name is absent from the list. Following this test, the malware scans to find VMWare, VBOX, or SONI values on IDE/SCSI hard drives.

Such thorough virtual machine checks are not the only jack up the sleeve that Gootkit has regarding evasion. To increase the success rate of installs, the malware creators frequently make modifications to the Trojan, changing the targeted processes for injections and filetypes of the executable.

For example, instead of running an .exe file, some samples of Gootkit load a DLL directly into a target process. What’s more, while the majority of malware select the explorer.exe process as their injection target, Gootkit targets a service host (svchost) process instead. Presumably, this is done to further evade detections since injecting into a process with several instances makes Gootkit easier to hide.

In addition to advanced anti-detection methods, Gootkit malware employs equally sophisticated persistence techniques to ensure that its deletion from an infected machine will prove as complicated as possible. The malware provides two main persistence mechanisms, which are used depending on the available system rights. When launched from an admin account, Gootkit can mimic a Windows service with a random name, which helps to confuse users. This way, it can launch before a victim logs on and continues running even after logging off.

However, if launched from a least-privilege user account, the virus writes itself as a scheduled task and a random name. This task is programmed to run every minute and on every boot, ensuring that the malware will remain on a machine after antivirus software scans and system reboots.

Gootkit malware analysis

A video of the simulation recorded in the ANY.RUN malware hunting service allows us to perform an analysis of the execution of Gootkit and see this virus in action. Moreover, you can investigate the vast malware database in the public submissions, too.The video is available here.

gootkit execution process graph

Figure 1: the lifecycle of Gootkit can be viewed in a visual format on the process graph generated by the ANY.RUN online analysis sandbox.

text report of the gootkit malware analysis

Figure 2: This text report available at this link provides more detailed information about Gootkit execution processes, artifacts, and more.

Gootkit execution process

Gootkit often gets into the system as an email attachment in the form of a Microsoft Word file. After the user opens the malicious file, it starts Powershell to download the main payload.

It should be noted that in some cases, Gootkit postpones the execution by putting itself in scheduled tasks. After the main payload execution starts, Gootkit unpacks and launches itself. This process provides the main malicious activity - stealing personal information, downloading other malware, grabbing video of the victim’s desktop, hijacking banking credentials, connecting to C2 servers, and so on. In the given example, Gootkit also uses WMIC.EXE to obtain a list of AntiViruses.

Distribution of Gootkit

Gootkit utilizes multiple attack vectors to infect its victims, including popular exploit kits like Neutrino and Angler, allowing the malware to get into machines with not-up-to-date operating systems.

The second used attack vector is email spam, where Gootkit is delivered to users as a malicious email attachment. Social engineering is used to trick the user into downloading the malicious file.

How to avoid infection by Gootkit?

Several online safety rules can be followed to greatly reduce the risk of infection by malware such as Gootkit. For instance, users are advised to install the freshest OS updates and update applications that users utilize regularly.

At the same time, those applications that are rarely opened should be deleted from the machine. In addition, it is advised to disable ads in the browser and avoid visiting suspicious websites. Furthermore, if a private inbox is used at work instead of a corporate one, a user should restrain from sending sensitive information to and from this personal email address.

It should be noted that opening email attachments in suspicious emails always poses a high risk of injection. Therefore users must never run suspicious programs downloaded from emails sent from unrecognized addresses.

How to export Gootkit data using ANY.RUN?

If the analyst wants to do additional work with events from tasks or share them with colleagues, they can export to different formats. Just click on the "Export" button and choose the most suitable format in the drop-down menu.

options for export events from tasks with gootkit Figure 3: Options for export events from tasks with Gootkit

Conclusion

Although Gootkit is responsible for a negligible percentage of the overall attacks by financial malware, this Trojan should be considered an extremely high-risk danger. Thanks to its sophisticated persistence and anti-evasion functions, it is capable of potentially very damaging attacks.

What’s more, following the Trojan development over the years, it is safe to assume that its evolution will continue. Cybercriminals behind the malware will keep producing ways to evade modern security solutions.

That’s why utilizing the most reliable and cutting edge analysis tools, such as the ANY.RUN malware hunting service can be a key to setting up a secure cyber defense against serious threats like Gootkit. Check the service's malware database to find out about other malicious programs.

IOCs

IP addresses
5.45.66.39
5.45.71.227
185.238.168.33
216.218.185.162
216.218.208.114
37.1.207.160
216.218.135.114
85.214.228.140
185.158.248.133
31.214.157.162
185.44.105.78
5.45.68.138
5.61.34.67
5.61.34.67
37.1.218.243
5.45.85.133
8.209.77.50
45.92.156.143
185.186.79.245
5.45.66.36
Hashes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isns.net
qxq.ddns.net
majul.com
bi.bisrv.com
booking.msg.bluhotels.com
booking.msg.bluhotels.com
hinnerot.fun
generalebad.xyz
najlepsieurobit.xyz
miatta-oh.xyz
god-tomorrow.xyz
partlong-livewithstand.icu
here-you-golesson.xyz
warming-need.xyz
sprechen-groe-wahrend.xyz
dog-information.xyz
yeah-gelesen.xyz
i-took-eyes.xyz
super-beim.xyz
hidegmegolte.fun

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