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
27 March, 2020
Global rank
28
Week rank
21
Month rank
25
IOCs
400

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
109.74.5.95
160.153.136.3
94.126.40.154
159.65.79.173
92.38.128.47
5.45.179.186
185.25.149.178
107.161.30.122
219.94.242.134
185.234.52.166
46.101.214.173
54.38.143.246
199.101.86.6
107.152.33.215
160.153.129.229
162.219.250.21
107.170.158.58
198.71.233.227
91.103.2.132
89.107.129.122
Hashes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majul.com
isns.net
posqit.net
perfect-jewellery.co.uk
leedsandmanuinoz.com
www.i-pony.com
shop.dehuisdiersuper.be
kamrancaan.co.uk
www.duplay.co.uk
www.samuraiswordsuk.co.uk
www.veganalo.com
meliodigital.com
playablancaaccommodation.com
www.airport-parking-gatwick.info
carlyleholdings.co.uk
myfif.com
www.grandi.co.uk
www.beatheprice.com
www.airport-parking-manchester.info
www.womenineconomics.com

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