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CryptBot

62
Global rank
73
Month rank
64 infographic chevron week
Week rank
562
IOCs

CryptBot is an advanced Windows-targeting infostealer delivered via pirate sites with "cracked" software. It has been first observed in the wild in 2019.

Infostealer
Type
Unknown
Origin
20 December, 2019
First seen
18 May, 2024
Last seen

How to analyze CryptBot with ANY.RUN

Infostealer
Type
Unknown
Origin
20 December, 2019
First seen
18 May, 2024
Last seen

IOCs

Hashes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s.tmp
morbyj05.top
deodd52.top
morexn05.top
ewafve51.top
faodrt28.top
darzcb62.top
bridmz52.top
poqvyg22.top
wyxead72.top
moraaaasf01.top
piperoerrt23.top
moraffdd04.top
leribis02.top
befqlo52.top
mortos05.top
nkoopw11.top
moraass08.top
morgwa06.top
e.exe
URLs
http://vbthre3vs.top/zip.php
http://vseven7sr.top/gate.php;
http://fygbib44.top/gate.php;
http://sginiv12.top/gate.php;
http://sgizfn14.top/gate.php;
http://wuqvas12.top/gate.php;
http://vfive5pn.top/gate.php;
http://vfive5sr.top/gate.php;
http://cfive5vt.top/gate.php;
http://xfive5vs.top/gate.php;
http://xfive5sr.top/gate.php;
http://zfive5vt.top/gate.php;
http://pfive5sr.top/gate.php;
http://psix6sb.top/gate.php;
http://psix6vt.top/gate.php/;
http://xfive5pn.top/gate.php;
http://zfive5vs.top/gate.php;
http://zfive5sr.top/gate.php;
http://pfive5pt.top/gate.php;
http://pfive5vt.top/gate.php/;
Last Seen at

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What is CryptBot malware

CryptBot, initially detected in 2019, is an information stealer designed to compromise Windows operating systems.

Its primary purpose is to exfiltrate confidential data from infected machines, such us:

  • browser credentials
  • cryptocurrency wallet details
  • browser cookies
  • credit card data
  • and system screenshots

The primary distribution channels for CryptBot involve spearphishing emails and illicit software cracks.

CryptoBot is a relatively modern malware. However, it’s authors are constantly evolving the threat, making it harder to detect. Around February 2022 researchers began noticing that threat actors simplified CryptBot’s functionality, making it lighter, leaner, and less likely to be detected.

This saw them remove features such as the anti-sandbox evasion, redundant second C2 connection, second exfiltration folder, screenshot function, and the option to collect data on TXT files on the desktop.

At the same time, post 2022 samples have gained targeted additions and improvements that make them more potent. Previously, the malware could only exfiltrate data from Chrome versions between 81 and 95. Now, CryptBot searches all file paths and exfiltrates user data, regardless of the Chrome version in use. This improvement allows CryptBot to be effective against a wider range of targets.

CryptBot infection method

Initiation of the CryptBot attack sequence typically occurs when an unsuspecting user visits a compromised webpage and is lured into downloading what appears to be a legitimate file, such as an SFX file posing as software like Adobe Photoshop. Once the user downloads the file, a malicious SFX file is placed on their computer. When executed, a folder is created in the user's %Temp% directory, containing several files that enable the subsequent stage of the attack.

The folder might contain an authentic Windows DLL, a BAT script, a concealed AutoIT script, and an AutoIT v3 compiler for executables. Some files might be disguised as image, audio, or video files to hide their actual purpose. The specific file extensions used can vary across different CryptBot versions.

The AutoIT interpreter tool, which is frequently exploited by numerous malware families, plays a role in the attack process. The BAT script examines the victim's system for certain antivirus products and uses a "sleep" function to avoid detection if any are found. It is also in charge of decrypting the highly obfuscated AutoIT script and transferring it to the virtual memory area for execution.

In the end, the AutoIT compiler for executables runs the harmful script, initiating an AutoIT process and loading the CryptBot binary into the system's memory.

How to get more information from CryptBot malware

At ANY.RUN, you can securely execute CryptBot and conduct dynamic analysis within a completely interactive cloud-based sandbox environment. Our platform automatically gathers and presents rich execution data in easy-to-read formats.

CryptBot malware configuration extracted by ANY.RUN Figure 1: CryptBot’s configuration automatically extracted by ANY.RUN

You can collect more info about the analyzed sample by looking at extracted malware configuration. A PCAP file for later analysis is also available for download.

CryptBot infostealer execution process

Upon initiating the initial payload, the execution flow of CryptBot can be variable. Cryptbot might sometimes employ the "compile after delivery" technique for defense evasion or release and execute a second file.

Then, the malware gathers data about the infected system, the software installed, and pilfers credentials. For data exfiltration, the stealer often establishes a connection with the C2 domain, with the ** .top** extension. It's noteworthy that it consistently sends requests to a page named gate.php. After completing these actions, the malware may implement a file deletion technique, deleting itself.

Read a detailed analysis of CryptBot in our blog.

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Distribution of CryptBot

In addition to utilizing phishing and spearphishing techniques with infected documents, starting around February 2022, CryptBot has expanded its distribution methods by leveraging cracked software lures to target potential victims.

The strategy involves creating websites that masquerade as providers of software cracks, key generators, pirated games, or other utilities. Then, search engine optimization (SEO) techniques are used to rank the malware distribution sites at the top of Google search results.

The malicious websites undergo frequent updates, employing various lures to attract users. Visitors are taken through a series of redirections before reaching the delivery page, which may be hosted on a compromised legitimate site for SEO poisoning attacks.

Wrapping up

CryptBot's primary targets are individuals searching for software cracks, warez, and other methods of bypassing copyright protection. To avoid infection by CryptBot and other similar malware, users should refrain from downloading such tools.

By staying informed about CryptBot's distribution methods and recent changes, malware analysts and security researchers can better understand this threat and develop effective countermeasures.

Speed up your workflow by analyzing CryptBot in ANY.RUN. Create an account using your business email and try our interactive cloud sandbox for free.

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