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CryptBot

57
Global rank
32
Month rank
43
Week rank
559
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
29 November, 2023
Last seen

How to analyze CryptBot with ANY.RUN

Infostealer
Type
Unknown
Origin
20 December, 2019
First seen
29 November, 2023
Last seen

IOCs

Hashes
2df20e3b1de29cd7dc70019017592b353a2e087766294ae051a8cbd0c5428ae8
1068aa09d6a9f1cde6bb844615d4c3dee09f296ba1a90cf898349ae08d6d2481
6796ac72433542c8cd005746b9a95c4b26eb2ce7aa0972e4fd8eb839c20a328b
fedec2022deda5e3993c9c527c1dd39269ac8a6a0e4604df1343aef441d901b1
3529fdeb51006fd75fa7d19d9b686d64de7b2b89f7eb90b5f9e0e83b82693b28
48cd50b9f44a45645ba21b8e0846954c66f2dc99a69ee853428f1793d91ddc40
4d85514b7f17f7f8e08e5e3af79dddab8aa8b5461f2bb192032e933d6c10f015
4488e2e5a11c0c872a2047ab9429f953aa9f2e209fbd2390f8a4a280e0aaead5
8079494d11dee40b555bde3a9af104f0d9ea48ee64b89256cdd3200b38d91ccf
e0b4a50936121a35d8c2985e581c0900e8f481afb0ef8506e272d3a744630bf2
64dae2d962de63731c94b2c05b23b69e909440c6207292a84587b2f80702151a
4dd43cd1ef81ecab7244b6128abf24e30638cf7f20eea778a20ebfa21016f4cc
cc76ddcff8abaf26698c735a56abb171773c48262e06ae2dbdcaf13769edb8de
0fa589b5efdc024f5d269715783d813d8318e1c7b563273148668d2d896bc9c1
21fc45114fc6173997d7a292db2973a6453623d44b316df8dc7987f5d9835553
863fd040cd49ddf902538a66cd9cbef63b35f36da1066cbba4a51483dde7113a
befe95a41d4071febabdb49ef9755e6881852664ecdd6e21da3e28382014ded5
6635d6beb7f8b5eb27db2c7724bef7d25ce08d5c71413f09c38c5bd75ef12e98
0e2b34250614f1624147b1b713bc76a1e500e341f5509bc892d57026bbf9e224
d633c009d823a8d71c9abbbf8f2dd92813c0f2721ec6572e624e5644153365f4
Domains
s.tmp
deodd52.top
morbyj05.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
moraass08.top
nkoopw11.top
e.exe
sezwap67.top
URLs
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/;
http://pfive5vs.top/gate.php;
http://pfive5cht.top/gate.php
http://pfive5sr.top/gate.php
http://netbi5n.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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