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Snake

60
Global rank
87 infographic chevron month
Month rank
78 infographic chevron week
Week rank
1019
IOCs

Snake is a modular keylogger written in .NET. Adversaries use this malware to exfiltrate confidential data, such as keystrokes, screen captures, and login credentials.

Keylogger
Type
Ex-USSR
Origin
15 August, 2019
First seen
29 March, 2022
Last seen
Also known as
404 Keylogger
404KeyLogger
Snake Keylogger

How to analyze Snake with ANY.RUN

Type
Ex-USSR
Origin
15 August, 2019
First seen
29 March, 2022
Last seen

IOCs

IP addresses
31.210.74.53
Hashes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cp5ua.hyperhost.ua
smtp.privateemail.com
mail.saadzakhary.com
mail.skyshine.com.my
mail.activeshipping.com
mail.stilltech.ro
mail.valleycountysar.org
mail.yezinsaat.com.tr
mail.nclanka.lk
mail.alfalahchemicals.com
mail.prinutrition.com
posta.ni.net.tr
smtp.azebal.com
mail.sienkakupeste.com
mail.anatolia-mountains.com
mail.eversafe.pt
mail.rockglen.com
mail.alroman.com
mail.karacainsaat.com.tr
mail.algodontekstil.com
Last Seen at

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What is Snake malware

Snake is a modular infostealer and keylogger that was initially discovered in November 2020. Developed using the .Net programming language, it exhibits similarities with the AgentTesla, Formbook, and Matiex malware families, particularly in its staging mechanism.

Snake poses a significant risk to privacy due to its ability to exfiltrate a broad range of data. Its capabilities include:

  • Keyboard capturing
  • Clipboard hijacking
  • Credential theft
  • Screen recording

Snake is capable of stealing credentials from over 50 applications, including popular web browsers and file transfer clients, such as FileZilla. Notably, this malware is also able to steal wireless network profiles.

This keylogger is also notable due to its ability to exfiltrate that data through multiple protocols: FTP, SMTP, and Telegram.

Additionally, Snake collects system information including the hardware configuration, name, and operating system version of the infected machine.

Utilizing the system's IP address and date-time information, it identifies the geolocation of the machine it operates on. Some Snake samples, though not all, use this data to activate a kill switch. Such behavior is common for malware originating from the ex-USSR region, typically avoiding targets within nearby countries.

The threat of Snake infection is not confined to specific industries or geographical areas. According to some reports, it has the potential to infect all major platforms, including Windows, Linux, and more recently, MacOS. In addition, Snake is a highly popular malware — it often competes with AgentTesla for the top spot of various charts.

Snake is readily available as a Malware-as-a-Service on underground forums, with pricing options that range from 25 to 500 USD.

This infostealer comes equipped with anti-evasion capabilities. In some samples, its downloader component was found to sleep for a period of time to evade automatic sandboxes. It can also terminate processes related to AV and network analysis tools, such as Avast and Wireshark.

Upon completing the initial process, Snake secures its persistence by duplicating itself into the AppData folder under a random name, generating a scheduled task configuration within a temporary directory, and initiating a scheduled task. What’s more, it possesses the ability to self-delete from the system post data exfiltration, employing a deletion command with a 3-second timer.

Snake keylogger execution process

As a typical stealer, Snake keylogger doesn't produce a lot of noticeable activity, which makes its detection potentially tricky. However, once it's established on an infected machine, it may increase its activity — capturing more data and sending it to the command-and-control server.

In the majority of Snake versions, a single process is responsible for all malicious activities, which include stealing data from the compromised system. In the specific sample of Snake we've analyzed, this process was identified as arinzehfkd685371.exe.

snake keylogger main process

arinzehfkd685371.exe process details

The Snake malware uses a variety of tactics and techniques, as illustrated in the Mitre ATT&CK Matrix. Key strategies include:

  • exploiting client vulnerabilities for initial access
  • extracting credentials from files and password stores
  • querying the system registry
  • and collecting local emails.

It also uses tool transfers and mail protocols for command, control, and exfiltration purposes. Notably, a significant proportion of events (270) involved stealing credentials from files.

snake keylogger ATT&CK Matrix

The Mitre ATT&CK Matrix for Snake malware

During the analysis, ANY.RUN cloud interactive sandbox was able to retrieve Snake’s config automatically. The displayed configuration reveals the DES encryption key and the SMTP credentials used for data exfiltration.

snake keylogger configuration

Snake keylogger malware configuration

Network monitoring tools can use this SMTP information for detection, potentially flagging or blocking traffic associated with the host or email addresses.

Read a detailed analysis of Snake Keylogger in our blog.

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Distribution of Snake malware

As is common with Malware-as-a-Service families, Snake is distributed through mass email phishing campaigns and targeted spearphishing. It is known to arrive via infected Microsoft Office documents or PDFs, typically embedded in payment-related messages.

Upon the user extracting the executable, it proceeds to decode and decrypt the base-64 payload, which is contained within a string variable.

Users are recommended to remain vigilant when downloading payment receipts or any documents from unfamiliar senders. Key signs of phishing attempts to look out for include poor grammar, manipulative messaging, and an unusually high number of typos for a professional email.

Snake malware conclusions

In closing, Snake is a powerful infostealer and keylogger that targets various industries and platforms, capable of extracting a wide range of data. Its sandbox evasion capabilities only add to the challenge of detection and analysis.

Try analyzing Snake in ANY.RUN. Create a free account using your business email to try out our interactive cloud malware sandbox.

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