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
19 February, 2020
Global rank
28
Week rank
24
Month rank
27
IOCs
367

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
54.38.143.246
107.170.158.58
109.123.107.19
67.43.9.168
67.227.241.204
67.43.9.168
160.153.136.3
109.74.5.95
88.217.172.164
195.14.0.12
92.38.128.47
92.222.28.78
216.177.137.25
198.167.140.176
82.118.225.196
62.75.168.106
31.220.2.120
198.71.233.227
52.53.192.135
212.227.92.116
Hashes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majul.com
isns.net
jelenia.pl
jelenia.pl
www.eluta.ca
static.eluta.ca
www.safeclean.services
happykidz.com.au
phluxuryfabrics.com
ip-160-153-136-3.ip.secureserver.net
florissantfire.com
europeancirclenyc.com
www.royalhair.info
britainrewards.com
expertmediator.ca
hunterdirectional.com
mavlet.com
iprojectsolutions.com
www.iprojectsolutions.com
iprojectcloseout.com

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