Dridex

Dridex is a very evasive and technically complex banking Trojan. Despite being based on a relatively old malware code, it was substantially updated over the years and became capable of using very effective infiltration techniques that make this malware especially dangerous.

Type
Trojan
Origin
ex-USSR territory
First seen
1 January, 2014
Last seen
30 September, 2020
Global rank
28
Week rank
16
Month rank
17
IOCs
687

What is Dridex malware?

Dridex is one of the most technologically advanced banking trojans currently active. The primary target of this malware is stealing banking credentials from its victims. Dridex has been around since 2014 and has benefited from very consistent updates that helped the malware evolve and become more and more capable.

Thanks to constant evolution, Dridex currently supports very advanced functions like the Atom Bombing injection technique, web injects into Chrome and Microsoft Word zero-day exploit which helped the Dridex malware to make its way into countless machines.

Dridex is classified to be the evolution of the GameOver ZeuS, borrowing a C&C architecture from this virus and further improving upon it, making control servers very hard to pinpoint. The Dridex banking trojan also features similarities to other malware – CRIDEX and Bugat. However, while the latest relies mostly on vulnerabilities as an attack vector, Dridex also uses mail spam to infect the machines of its victims.

General description of Dridex malware

According to the new information, US and UK law enforcement organizations uncovered the identities of people behind Evil Corp — the cybergang that developed Dridex and several other malicious programs. Maxim Yakubets who is living in Moscow is suspected to be the group’s leader. He has been seen driving a Lamborghini Huracan with a number plate that reads “thief” in Russian. As a result of the investigation, the US Department of State has announced a $5 million reward for turning in Yakubets. This is the largest reward ever offered for a cybercriminal.

The spike of the popularity of Dridex trojan was recorded in the period between its first spotting in the wild until the year 2015. The subsequent malicious campaigns were fewer in number and perhaps not as global as the ones observed before 2015. Usually, the malware targets victims in Europe with over half of recorded infections taking place in the UK, though, German, French and US users are also in danger. Notably Dridex banking Trojan never attacks victims in the Russian Federation, which could indicate that the group behind this threat comes from this country. Dridex is one of the most popular banking Trojans in the world, placing at the seventh spot out of the top ten most widely spread viruses of this type by the number of infections in 2015, according to the data of flashpoint-intel.

The malware can perform a series of data-stealing actions including Form-grabbing, clickshot taking, and site injections. This allows Dredex to steal sensitive data such as logins and passwords when the victim logs into their banking account. This data can then be used by the attackers in future campaigns or sold to other criminals. In addition, the malware is capable of taking screenshots, allowing hackers to collect personal information about the victim. What’s more, the malware is able to change the content of web pages that the user is viewing using web-inject techniques, so when the user enters his login and password, instead of logging into a personal account this sensitive data is sent directly to the attackers.

Dridex trojan uses a Botnet as a Service operation model which entitles that infected PCs can become attack sources for future campaigns. This helps the malware to spread more efficiently and makes its attacks more global.

Some of the previous versions of this malware used to have a fairly unique persistence mechanism which researchers called “invisible”. It was dubbed so because the malware’ dynamic link library (DLL) was saved on a disk, and a registry value was generated to run the malicious DLL at system startup just only before the PC would be turned off.

Malware analysis of Dridex trojan

A video simulation recorded on ANY.RUN allows us to examine the lifecycle of the Dridex malware.

process graph of the dridex execution Figure 1: Process graph generated by ANY.RUN allows us to see the main processes of Dridex execution.

text report of the dridex analysis Figure 2: Displays the customizable text report generated by ANY.RUN.

Execution of Dridex malware

The execution process of Dridex is pretty short and straightforward. Similarly to a lot of malware nowadays, the banking Trojan makes its way into the victim's system as a malicious attachment, usually a Microsoft Office file, which is delivered in spam emails. After the user downloads and opens such a file and enables macros, the infection process begins. Dridex trojan is capable of utilizing different techniques to deliver the main payload. The payload can be downloaded directly by Microsoft Office or by injected system applications, for example, explorer.exe, or leveraged by the vulnerabilities exploit such as Microsoft Equation Editor. After the downloaded payload starts execution, it begins the main malicious activity such as writing itself into autorun in the registry, searching for installed software, executing scripts, connecting to the C2 server, and more.

Prevention of Dridex attacks

Users can avoid getting infected by banking Trojans such as Dridex by staying clear of suspiciously looking emails. To stay completely safe one should never launch files downloaded from emails which were delivered from unknown senders. A clear indication of the malicious nature of downloaded files can be that when opened, Microsoft Office files will prompt the user to enable macros – something users should never do to avoid infection. Additionally, it is advised to keep an updated version of a trusted antivirus product on a machine at all times.

How does Dridex malware spread?

Dridex mainly spreads using spam email campaigns and makes its way into targeted machines in the form of malicious email attachments. The emails are designed to resemble financial related messages, such as invoice delivery from real businesses and usually contain a malicious Microsoft Office document as an attachment.

Social engineering is used to trick potential victims into downloading and opening attached files, which when run execute a malicious macro which installs the Dridex banking trojan on the machine.

How to detect Dridex using ANY.RUN?

If Dridex trojan wasn't detected or you want to double-check you can use additional ANY.RUN functionality to get more from your analysis. During execution, Dridex unpacks itself in memory and enters the long-drawn-out loop. On each loop iteration malware output debug string "Installing...", so if you run into this first think that this is Dridex

dridex debug output Figure 3: Dridex debug output

Conclusion

Even though Dridex popularity has declined somewhat since its initial release, it is still an extremely popular and capable malware which is used in several attacks targeting companies in Europe and North America. Thanks to advanced persistence mechanisms and almost untraceable C&C servers, Dridex attacks are very hard to battle, making this malware extremely effective.

Thankfully, malware hunting services like ANY.RUN allow researchers to study threats similar to Dridex to set up effective countermeasures.

IOCs

IP addresses
146.164.126.197
160.153.136.3
104.23.98.190
67.79.105.174
45.79.226.106
51.83.96.87
85.214.26.7
109.74.5.95
192.175.111.212
59.10.131.141
144.217.7.207
145.239.169.32
85.92.73.71
153.92.4.96
185.141.25.136
162.144.127.197
160.153.129.229
176.10.250.88
185.86.148.68
54.38.143.245
Hashes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majul.com
www.asappiling.com.au
capbonconsulting.com
www.capbonconsulting.com
www.koshersushiparty.com
www.shreveportnightlife.com
okckratom.com
bitqueen.com
www.waystoreducebellyfat.com
themidlandstrainingpartnership.co.uk
www.ivsdc.com
www.lgnutritionconsulting.com
shingletonfarms.com
www.shingletonfarms.com
winecountrymobilespa.com
winecountrymobilespa.com
www.lemoto.info
rbizassociates.com
www.rackingusa.com
showthescam.com

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