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
8 July, 2020
Global rank
28
Week rank
19
Month rank
16
IOCs
618

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
160.153.136.3
198.71.233.227
89.107.129.122
5.181.156.24
37.205.9.252
91.83.93.219
94.23.216.33
67.225.226.204
67.43.9.168
67.227.241.204
82.196.3.235
195.154.243.78
162.243.150.25
173.255.246.77
199.27.180.164
185.163.45.199
101.53.142.93
101.53.142.93
198.27.69.201
192.99.41.136
Hashes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majul.com
isns.net
www.apexlogisticscompany.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

HAVE A LOOK AT

Adwind screenshot
Adwind
adwind trojan
Adwind RAT, sometimes also called Unrecom, Sockrat, Frutas, jRat and JSocket is a Malware As A Service Remote Access Trojan that attackers can use to collect information from infected machines. It was one of the most popular RATs in the market in 2015.
Read More
Agent Tesla screenshot
Agent Tesla
agenttesla trojan rat stealer
Agent Tesla is spyware that collects information about the actions of its victims by recording keystrokes and user interactions. It is falsely marketed as a legitimate software on the dedicated website where this malware is sold.
Read More
Ave Maria screenshot
Ave Maria
avemaria stealer trojan rat
Ave Maria malware is a Remote Access Trojan that is also called WARZONE RAT. Hackers use it to control PCs of their victims remotely and steal information from infected PCs. For example, they can remotely activate the camera to take pictures of a victim and send them to a control server
Read More
Azorult screenshot
Azorult
azorult trojan rat
AZORult can steal banking information including passwords and credit card details as well as cryptocurrency. This constantly updated information stealer malware should not be taken lightly, as it continues to be an active threat.
Read More
Crimson RAT screenshot
Crimson RAT
crimson rat trojan
Crimson is a Remote Access Trojan — a malware that is used to take remote control of infected systems and steal data. This particular RAT is known to be used by a Pakistani founded cybergang that targets Indian military objects to steal sensitive information.
Read More
Danabot screenshot
Danabot
danabot trojan stealer
Danabot is an advanced banking Trojan malware that was designed to steal financial information from victims. Out of the Trojans in the wild this is one of the most advanced thanks to the modular design and a complex delivery method.
Read More