mountlocker | 4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273

General

Target

4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
Size

77KB
MD5

23ba9903c5073f8637cfb4476ccc86b0
SHA1

268248c43bc4d9f803a1eb6a941b0bd5622d5445
SHA256

4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273
SHA512

acdf49c35eaf42c37a57b89053ea24cf8935ed0062060be3903e257396063c1c0257df2a58712d9446a7881140c52be5a29d8c1cf9efdfcb8fea8de6288adc53

Score

10^/10

mountlocker ransomware spyware stealer

Malware Config

Extracted

Path

\??\c:\odt\RecoveryManual.html

Ransom Note

<html> <head> <title>RECOVERY MANUAL</title> </head> <body> <h1>Your ClientId:</h1> <pre> cb4e8508db9401e69c93177dd1410c052981a80ece84ab61b7d91246b6e70c58 </pre> <hr/> /!\ YOUR COMPANY NETWORK HAS BEEN PENETRATED /!\ All your important files have been encrypted! <hr/> Your files are safe! Only modified. (RSA+AES) ANY ATTEMPT TO RESTORE YOUR FILES WITH THIRD-PARTY SOFTWARE WILL PERMANENTLY CORRUPT IT. DO NOT MODIFY ENCRYPTED FILES. DO NOT RENAME ENCRYPTED FILES. No software available on internet can help you. We are the only ones able to solve your problem. We gathered highly confidential/personal data. These data are currently stored on a private server. This server will be immediately destroyed after your payment. If you decide to not pay, we will release your data to public or re-seller. So you can expect your data to be publicly available in the near future.. We only seek money and our goal is not to damage your reputation or prevent your business from running. You will can send us 2-3 non-important files and we will decrypt it for free to prove we are able to give your files back. <hr/> Contact us for price and get decryption software. <a href="http://zsa3wxvbb7gv65wnl7lerslee3c7i27ndqghqm6jt2priva2qcdponad.onion/?cid=cb4e8508db9401e69c93177dd1410c052981a80ece84ab61b7d91246b6e70c58">http://zsa3wxvbb7gv65wnl7lerslee3c7i27ndqghqm6jt2priva2qcdponad.onion/?cid=cb4e8508db9401e69c93177dd1410c052981a80ece84ab61b7d91246b6e70c58</a> * Note that this server is available via Tor browser only Follow the instructions to open the link: 1. Type the addres "https://www.torproject.org" in your Internet browser. It opens the Tor site. 2. Press "Download Tor", then press "Download Tor Browser Bundle", install and run it. 3. Now you have Tor browser. In the Tor Browser open "http://zsa3wxvbb7gv65wnl7lerslee3c7i27ndqghqm6jt2priva2qcdponad.onion/?cid=cb4e8508db9401e69c93177dd1410c052981a80ece84ab61b7d91246b6e70c58". 4. Start a chat and follow the further instructions. <hr/> Make contact as soon as possible. Your private key (decryption key) is only stored temporarily. IF YOU DON'T CONTACT US WITHIN 72 HOURS, PRICE WILL BE HIGHER. </body> </html>

Signatures

MountLocker Ransomware
Ransomware family first seen in late 2020, which threatens to leak files if ransom is not paid.
ransomware mountlocker

Modifies extensions of user files 8 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File opened for modification	\??\c:\Users\Admin\Pictures\UnprotectLock.raw.ReadManual.62087744	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
File renamed	C:\Users\Admin\Pictures\UnregisterConvertTo.tif => \??\c:\Users\Admin\Pictures\UnregisterConvertTo.tif.ReadManual.62087744	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
File opened for modification	\??\c:\Users\Admin\Pictures\UnregisterConvertTo.tif.ReadManual.62087744	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
File renamed	C:\Users\Admin\Pictures\ConvertFromClose.raw => \??\c:\Users\Admin\Pictures\ConvertFromClose.raw.ReadManual.62087744	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
File opened for modification	\??\c:\Users\Admin\Pictures\ConvertFromClose.raw.ReadManual.62087744	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
File renamed	C:\Users\Admin\Pictures\StopRedo.tiff => \??\c:\Users\Admin\Pictures\StopRedo.tiff.ReadManual.62087744	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
File opened for modification	\??\c:\Users\Admin\Pictures\StopRedo.tiff.ReadManual.62087744	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
File renamed	C:\Users\Admin\Pictures\UnprotectLock.raw => \??\c:\Users\Admin\Pictures\UnprotectLock.raw.ReadManual.62087744	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000_Classes\.62087744\shell\Open\command	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
Key created	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000_Classes\.62087744	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
Key created	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000_Classes\.62087744\shell	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
Key created	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000_Classes\.62087744\shell\Open	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000_Classes\.62087744\shell\Open\command\ = "explorer.exe RecoveryManual.html"	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1168	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
1168	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1168	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
Token: SeTakeOwnershipPrivilege	1168	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
Token: SeRestorePrivilege	1168	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1168 wrote to memory of 2140	1168	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe	80
PID 1168 wrote to memory of 2140	1168	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe	80
PID 1168 wrote to memory of 2140	1168	4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe	80
PID 2140 wrote to memory of 2776	2140	cmd.exe	83
PID 2140 wrote to memory of 2776	2140	cmd.exe	83
PID 2140 wrote to memory of 2776	2140	cmd.exe	83

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1158

pid	Process
2776	attrib.exe

C:\Users\Admin\AppData\Local\Temp\4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe
"C:\Users\Admin\AppData\Local\Temp\4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe"
1⤵
- Modifies extensions of user files
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1168
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\\01CD57D2.bat" "C:\Users\Admin\AppData\Local\Temp\4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2140
- - C:\Windows\SysWOW64\attrib.exe
    attrib -s -r -h "C:\Users\Admin\AppData\Local\Temp\4b917b60f4df6d6d08e895d179a22dcb7c38c6a6a6f39c96c3ded10368d86273.exe"
    3⤵
    - Views/modifies file attributes
    PID:2776