medusalocker | 34601e5edf184f46c37314559e0a361cbce3aadc451e09f8b84020232fa710ad

General

Target

rb.exe
Size

669KB
MD5

ae286ff258c5ec1d15a4fd3f64875d5b
SHA1

576b9e76e385b389f859ee4bde2d12776bbaedca
SHA256

ce0facb2c24c71a20117e27af3aed9d6815500eeadba6e79b472bef539d82769
SHA512

f2cf299e20571701ab7a7ad82103317279e8378f114e3de76b22580eb5e8263a025af1fb653b27323645e0ac63983dcbf6f609154a16e8e9d6c81531c369183b

Score

10^/10

medusalocker evasion ransomware spyware stealer trojan

Malware Config

Extracted

Path

C:\Boot\HOW_TO_RECOVER_DATA.html

Ransom Note

<html> <style type="text/css"> body { background-color: #f5f5f5; } h1, h3{ text-align: center; text-transform: uppercase; font-weight: normal; } /*---*/ .tabs1{ display: block; margin: auto; } .tabs1 .head{ text-align: center; float: top; padding: 0px; text-transform: uppercase; font-weight: normal; display: block; background: #81bef7; color: #DF0101; font-size: 30px; } .tabs1 .identi { font-size: 10px; text-align: center; float: top; padding: 15px; display: block; background: #81bef7; color: #DFDFDF; } .tabs .content { background: #f5f5f5; /*text-align: center;*/ color: #000000; padding: 25px 15px; font-size: 15px; font-weight: 400; line-height: 20px; } .tabs .content a { color: #df0130; font-size: 23px; font-style: italic; text-decoration: none; line-height: 35px; } .tabs .content .text{ padding: 25px; line-height: 1.2; } </style> <body> <div class="tabs1"> <div class="head" ><b>Your personal ID:</b></div> <div class="identi"> <span style="width:1000px; color: #ffffff; font-size: 10px;">8601BA2175B24F9144BF309E9882FA75490CDBABE4F5B7AA31F2D0E9FDB28D2594A8F89B4F3D84A2AFA8537D1FF803C0A57E0AB9717B50C7B356AAA8548344C5<br>3292C07AA85D94D7F7A4F8E7CB7F0A6BD6709CE3FBB79F36C4DA5D113B08986CF8F6ED56DB06AD1474072CAB060F9A501AD1DF35B36AA31AD350F2011361<br>46924C0B1DF07745FBD4089958AB13054258F36D92C23F9EE5E87932B7A323A40D988AD460E69325178CDA8022FC2309889C8F1116253887D57925CC4C91<br>639D408E3B946CFF1CE32B784BFF126703CED1CC052341C64F5B7771857DE9E7DE33EE5B3B95EAC32EFB1B7A8B226F7764252BB09191DE5849A83DF1ADB1<br>6C9772401A34EB9952D71D0241B50AF2C48E56DBDA1CEF37AEA1C0956187A251BD9E2B31A3799E241CC20B5ED973BA09AE3CB25687D979A9859EAB43F86C<br>A3C90744DECBF412C80160A6FC25AE65EBDB1C24B142096567AA5C9D981008A1D35B8901D07BF0550FD4D319BA0EAA91AAB48EDBA6D31B43C2300C024CFE<br>B127EDEDEF580ABF0FA6826FB603DC9A8AE9DC45786BDCF46D70AF42483F1EDD05AB5F80E887B7F165856201140044F67AAA47694D0D2C1B81C73A2919F4<br>1BCDCD9BF3D323CD952F48217B71456FED9F328E35B12657DE0215990511DF3E1E25491985589F9B851B3FBF1C74E86C48A2B2754259C48F2B399A6D871F<br>783F0E4D77658126552003AC6509</span> <br>  </div> </div>  <div class="tabs">  <div class="tab"> <div id="tab-content1" class="content"> <div class="text">  <b>/!\ YOUR COMPANY NETWORK HAS BEEN PENETRATED /!\</b><br> <b>All your important files have been encrypted!</b><br><br> <hr> Your files are safe! Only modified. (RSA+AES)<br><br> ANY ATTEMPT TO RESTORE YOUR FILES WITH THIRD-PARTY SOFTWARE<br> WILL PERMANENTLY CORRUPT IT.<br> DO NOT MODIFY ENCRYPTED FILES.<br> DO NOT RENAME ENCRYPTED FILES.<br><br> No software available on internet can help you. We are the only ones able to<br> solve your problem.<br><br> We gathered highly confidential/personal data. These data are currently stored on<br> a private server. This server will be immediately destroyed after your payment.<br> If you decide to not pay, we will release your data to public or re-seller.<br> So you can expect your data to be publicly available in the near future..<br><br> We only seek money and our goal is not to damage your reputation or prevent<br> your business from running.<br><br> You will can send us 2-3 non-important files and we will decrypt it for free<br> to prove we are able to give your files back.<br><br>  <hr> <b>Contact us for price and get decryption software.</b><br><br> <a>.onion</a><br> * Note that this server is available via Tor browser only<br><br> Follow the instructions to open the link:<br> 1. Type the addres "https://www.torproject.org" in your Internet browser. It opens the Tor site.<br> 2. Press "Download Tor", then press "Download Tor Browser Bundle", install and run it.<br> 3. Now you have Tor browser. In the Tor Browser open <a>qd7pcafncosqfqu3ha6fcx4h6sr7tzwagzpcdcnytiw3b6varaeqv5yd.onion </a><br> 4. Start a chat and follow the further instructions. <br><br> <hr> <b>If you can not use the above link, use the email:</b><br> <a href="help_24_decr1@outlook.com ">help_24_decr1@outlook.com </a> <br><a href="help_24_decr2@outlook.com">help_24_decr2@outlook.com</a> <br> <b>* To contact us, create a new free email account on the site:</b> <a href="https://protonmail.com">protonmail.com<br> <hr> <b> IF YOU DON'T CONTACT US WITHIN 72 HOURS, PRICE WILL BE HIGHER.</b><br> </div> </div> </div>   </div> </div>  </div> </div> </body> </html>

Emails

href="help_24_decr1@outlook.com

">help_24_decr1@outlook.com

href="help_24_decr2@outlook.com">help_24_decr2@outlook.com</a>

Signatures

MedusaLocker
Ransomware with several variants first seen in September 2019.
ransomware medusalocker
UAC bypass 3 TTPs
evasion trojan

Bypass User Account Control
T1088

Disabling Security Tools
T1089

Modify Registry
T1112
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Modifies extensions of user files 8 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

rb.exe

description	ioc	process
File renamed	C:\Users\Admin\Pictures\CompleteConvertFrom.raw => C:\Users\Admin\Pictures\CompleteConvertFrom.raw.reads	rb.exe
File renamed	C:\Users\Admin\Pictures\ExportHide.raw => C:\Users\Admin\Pictures\ExportHide.raw.reads	rb.exe
File renamed	C:\Users\Admin\Pictures\ExportInstall.tif => C:\Users\Admin\Pictures\ExportInstall.tif.reads	rb.exe
File renamed	C:\Users\Admin\Pictures\PopFind.raw => C:\Users\Admin\Pictures\PopFind.raw.reads	rb.exe
File renamed	C:\Users\Admin\Pictures\ResolveUninstall.tif => C:\Users\Admin\Pictures\ResolveUninstall.tif.reads	rb.exe
File renamed	C:\Users\Admin\Pictures\UnpublishRequest.tif => C:\Users\Admin\Pictures\UnpublishRequest.tif.reads	rb.exe
File renamed	C:\Users\Admin\Pictures\AssertInvoke.png => C:\Users\Admin\Pictures\AssertInvoke.png.reads	rb.exe
File renamed	C:\Users\Admin\Pictures\BackupConvertFrom.tif => C:\Users\Admin\Pictures\BackupConvertFrom.tif.reads	rb.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
Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

rb.exe

description ioc process

Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" rb.exe
Drops desktop.ini file(s) 1 IoCs

Processes:

rb.exe

description ioc process

File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-2481030822-2828258191-1606198294-1000\desktop.ini rb.exe

description	ioc	process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-2481030822-2828258191-1606198294-1000\desktop.ini	rb.exe

Enumerates connected drives 3 TTPs 24 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

rb.exe

description	ioc	process
File opened (read-only)	\??\U:	rb.exe
File opened (read-only)	\??\A:	rb.exe
File opened (read-only)	\??\B:	rb.exe
File opened (read-only)	\??\F:	rb.exe
File opened (read-only)	\??\K:	rb.exe
File opened (read-only)	\??\O:	rb.exe
File opened (read-only)	\??\P:	rb.exe
File opened (read-only)	\??\T:	rb.exe
File opened (read-only)	\??\Y:	rb.exe
File opened (read-only)	\??\Z:	rb.exe
File opened (read-only)	\??\I:	rb.exe
File opened (read-only)	\??\J:	rb.exe
File opened (read-only)	\??\R:	rb.exe
File opened (read-only)	\??\V:	rb.exe
File opened (read-only)	\??\W:	rb.exe
File opened (read-only)	\??\H:	rb.exe
File opened (read-only)	\??\L:	rb.exe
File opened (read-only)	\??\M:	rb.exe
File opened (read-only)	\??\N:	rb.exe
File opened (read-only)	\??\Q:	rb.exe
File opened (read-only)	\??\S:	rb.exe
File opened (read-only)	\??\X:	rb.exe
File opened (read-only)	\??\E:	rb.exe
File opened (read-only)	\??\G:	rb.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Interacts with shadow copies 2 TTPs 3 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
ransomware

File Deletion
T1107

Inhibit System Recovery
T1490

Processes:

vssadmin.exevssadmin.exevssadmin.exe

pid process

3920 vssadmin.exe
1652 vssadmin.exe
1084 vssadmin.exe

pid	process
3920	vssadmin.exe
1652	vssadmin.exe
1084	vssadmin.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

rb.exe

pid	process
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe
2064	rb.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

Processes:

vssvc.exewmic.exewmic.exewmic.exe

description	pid	process
Token: SeBackupPrivilege	864	vssvc.exe
Token: SeRestorePrivilege	864	vssvc.exe
Token: SeAuditPrivilege	864	vssvc.exe
Token: SeIncreaseQuotaPrivilege	3924	wmic.exe
Token: SeSecurityPrivilege	3924	wmic.exe
Token: SeTakeOwnershipPrivilege	3924	wmic.exe
Token: SeLoadDriverPrivilege	3924	wmic.exe
Token: SeSystemProfilePrivilege	3924	wmic.exe
Token: SeSystemtimePrivilege	3924	wmic.exe
Token: SeProfSingleProcessPrivilege	3924	wmic.exe
Token: SeIncBasePriorityPrivilege	3924	wmic.exe
Token: SeCreatePagefilePrivilege	3924	wmic.exe
Token: SeBackupPrivilege	3924	wmic.exe
Token: SeRestorePrivilege	3924	wmic.exe
Token: SeShutdownPrivilege	3924	wmic.exe
Token: SeDebugPrivilege	3924	wmic.exe
Token: SeSystemEnvironmentPrivilege	3924	wmic.exe
Token: SeRemoteShutdownPrivilege	3924	wmic.exe
Token: SeUndockPrivilege	3924	wmic.exe
Token: SeManageVolumePrivilege	3924	wmic.exe
Token: 33	3924	wmic.exe
Token: 34	3924	wmic.exe
Token: 35	3924	wmic.exe
Token: 36	3924	wmic.exe
Token: SeIncreaseQuotaPrivilege	1092	wmic.exe
Token: SeSecurityPrivilege	1092	wmic.exe
Token: SeTakeOwnershipPrivilege	1092	wmic.exe
Token: SeLoadDriverPrivilege	1092	wmic.exe
Token: SeSystemProfilePrivilege	1092	wmic.exe
Token: SeSystemtimePrivilege	1092	wmic.exe
Token: SeProfSingleProcessPrivilege	1092	wmic.exe
Token: SeIncBasePriorityPrivilege	1092	wmic.exe
Token: SeCreatePagefilePrivilege	1092	wmic.exe
Token: SeBackupPrivilege	1092	wmic.exe
Token: SeRestorePrivilege	1092	wmic.exe
Token: SeShutdownPrivilege	1092	wmic.exe
Token: SeDebugPrivilege	1092	wmic.exe
Token: SeSystemEnvironmentPrivilege	1092	wmic.exe
Token: SeRemoteShutdownPrivilege	1092	wmic.exe
Token: SeUndockPrivilege	1092	wmic.exe
Token: SeManageVolumePrivilege	1092	wmic.exe
Token: 33	1092	wmic.exe
Token: 34	1092	wmic.exe
Token: 35	1092	wmic.exe
Token: 36	1092	wmic.exe
Token: SeIncreaseQuotaPrivilege	1412	wmic.exe
Token: SeSecurityPrivilege	1412	wmic.exe
Token: SeTakeOwnershipPrivilege	1412	wmic.exe
Token: SeLoadDriverPrivilege	1412	wmic.exe
Token: SeSystemProfilePrivilege	1412	wmic.exe
Token: SeSystemtimePrivilege	1412	wmic.exe
Token: SeProfSingleProcessPrivilege	1412	wmic.exe
Token: SeIncBasePriorityPrivilege	1412	wmic.exe
Token: SeCreatePagefilePrivilege	1412	wmic.exe
Token: SeBackupPrivilege	1412	wmic.exe
Token: SeRestorePrivilege	1412	wmic.exe
Token: SeShutdownPrivilege	1412	wmic.exe
Token: SeDebugPrivilege	1412	wmic.exe
Token: SeSystemEnvironmentPrivilege	1412	wmic.exe
Token: SeRemoteShutdownPrivilege	1412	wmic.exe
Token: SeUndockPrivilege	1412	wmic.exe
Token: SeManageVolumePrivilege	1412	wmic.exe
Token: 33	1412	wmic.exe
Token: 34	1412	wmic.exe

Suspicious use of WriteProcessMemory 18 IoCs

Processes:

rb.exe

description	pid	process	target process
PID 2064 wrote to memory of 3920	2064	rb.exe	vssadmin.exe
PID 2064 wrote to memory of 3920	2064	rb.exe	vssadmin.exe
PID 2064 wrote to memory of 3920	2064	rb.exe	vssadmin.exe
PID 2064 wrote to memory of 3924	2064	rb.exe	wmic.exe
PID 2064 wrote to memory of 3924	2064	rb.exe	wmic.exe
PID 2064 wrote to memory of 3924	2064	rb.exe	wmic.exe
PID 2064 wrote to memory of 1652	2064	rb.exe	vssadmin.exe
PID 2064 wrote to memory of 1652	2064	rb.exe	vssadmin.exe
PID 2064 wrote to memory of 1652	2064	rb.exe	vssadmin.exe
PID 2064 wrote to memory of 1092	2064	rb.exe	wmic.exe
PID 2064 wrote to memory of 1092	2064	rb.exe	wmic.exe
PID 2064 wrote to memory of 1092	2064	rb.exe	wmic.exe
PID 2064 wrote to memory of 1084	2064	rb.exe	vssadmin.exe
PID 2064 wrote to memory of 1084	2064	rb.exe	vssadmin.exe
PID 2064 wrote to memory of 1084	2064	rb.exe	vssadmin.exe
PID 2064 wrote to memory of 1412	2064	rb.exe	wmic.exe
PID 2064 wrote to memory of 1412	2064	rb.exe	wmic.exe
PID 2064 wrote to memory of 1412	2064	rb.exe	wmic.exe

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

Processes:

rb.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	rb.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	rb.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1"	rb.exe

C:\Users\Admin\AppData\Local\Temp\rb.exe
"C:\Users\Admin\AppData\Local\Temp\rb.exe"
1⤵
- Modifies extensions of user files
- Checks whether UAC is enabled
- Drops desktop.ini file(s)
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2064