medusalocker | 73549f6017ad04e475e40e9d306b3e042d080843d8e7c029a5bb6b8ab7e34432

General

Target

svhost.exe
Size

678KB
MD5

5aa0a571567f8437556e9b00ae5a3532
SHA1

45377cb152832c9112db7909219fa87a6e760aae
SHA256

73549f6017ad04e475e40e9d306b3e042d080843d8e7c029a5bb6b8ab7e34432
SHA512

d320fecef75b4514b9cf154d41c3cc03e2cd8f6bf15ff0d7c97398127c0728cf0b24e5a46435573d38b384b1515876070f28daa7d37e81de10d1db2b27ae51ec
SSDEEP

12288:cPJ4UOTYQivI2qZ7aSgLwkFVpzUvest4ZEbjJLuhJVoM7:JRTYVQ2qZ7aSgLwuVfstRJL6YM

Score

10^/10

medusalocker evasion ransomware spyware stealer trojan

Malware Config

Extracted

Path

C:\Recovery_Instructions.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;">3DAB91E8B2232B80EB28438F2EA907088548772DAF8D788F42605285DF1D81881141FE849AD01AC8B70B9E0682B686F56831A7CF1967D58C8645C5412D9F3F44<br>7903AB54AF8C255E750FBB5354F03C0B0D3F69C7CAA2A9FB1C1F5C1729615DB28678E49EF1D0CC65DD93044B8BD3093AED2343AC0DC74356703864E46740<br>A2B7FD18CC59F988922D4E890A15DC07209BE7920839EA2A36DF17E3962DE01B6A1E9203F586BF22680CF89CCED4F7E51C190A664D05E758AA438F189CC2<br>075399D31EBA17E380F9874321C4740143F336660723DBB34CE43546F5FFD6DC2A44DB83A39E0BA66CEED051B206045581509E5DD9B0FFC2870C2C709ECF<br>5610412EE190D49F090DDB2E7BC44E4628BC79783F8AB9B46BBC4D57C46DD7E087E7D18F97E9FB0F55A184A6BE5F1C36380F5804F4CDF7B976E40D745420<br>D805EA390BAF8706BD7338EFD9D8C8E50CC230A70A376DBD53E31B13869B4681426F734151B233DACBC9CA912CCAAB1B90BAD2EF4DF80AEE321DF0FA1212<br>6C6E0745B7CAAE77AE0C09A74B963CD35A10F657BC1C868EF9FD518B5A4E3845224B223628C901CB4A5090ECAD3C23D5549FE6C280C9046AFA5F4E5932A7<br>1CD3C6388A02FFCD93507064D33DDB61C671108D32DC4545FDCF612752EB3C9BA56467F3E9E76F81FEC7F05524FC490C1DB7924D0C5155DD239BE5AC7AAF<br>291422B1A7531330AEE50702DE2F</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>http://gvlay6u4g53rxdi5.onion/31-LPy3hdSfGLBgLSfGcKN9rubDKoa1VMK4-rbyqjU67Kgs8bPNZj9nS7P4JQXmqi87n</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 "{{URL}}". <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="[email protected]">[email protected]</a> <br><a href="[email protected]">[email protected]</a> <br> <b>* To contact us, create a new mail on the site:</b> <a href="https://protonmail.com">protonmail.com<br> <hr> <b>Make contact as soon as possible. Your private key (decryption key) <br> is only stored temporarily.<br><br> 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="[email protected]">[email protected]</a>

Signatures

MedusaLocker
Ransomware with several variants first seen in September 2019.
ransomware medusalocker

UAC bypass 3 TTPs 2 IoCs

evasion trojan

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

svhost.exe

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

Modifies extensions of user files 16 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

svhost.exe

description	ioc	process
File renamed	C:\Users\Admin\Pictures\DenyUninstall.tiff => C:\Users\Admin\Pictures\DenyUninstall.tiff.ReadInstructions	svhost.exe
File renamed	C:\Users\Admin\Pictures\ProtectApprove.tif => C:\Users\Admin\Pictures\ProtectApprove.tif.ReadInstructions	svhost.exe
File renamed	C:\Users\Admin\Pictures\SyncCheckpoint.tiff => C:\Users\Admin\Pictures\SyncCheckpoint.tiff.ReadInstructions	svhost.exe
File renamed	C:\Users\Admin\Pictures\BlockSend.raw => C:\Users\Admin\Pictures\BlockSend.raw.ReadInstructions	svhost.exe
File renamed	C:\Users\Admin\Pictures\CompressEnable.tif => C:\Users\Admin\Pictures\CompressEnable.tif.ReadInstructions	svhost.exe
File renamed	C:\Users\Admin\Pictures\InstallConvert.crw => C:\Users\Admin\Pictures\InstallConvert.crw.ReadInstructions	svhost.exe
File renamed	C:\Users\Admin\Pictures\SetConfirm.tif => C:\Users\Admin\Pictures\SetConfirm.tif.ReadInstructions	svhost.exe
File opened for modification	C:\Users\Admin\Pictures\SyncCheckpoint.tiff	svhost.exe
File renamed	C:\Users\Admin\Pictures\ResizeOpen.tiff => C:\Users\Admin\Pictures\ResizeOpen.tiff.ReadInstructions	svhost.exe
File opened for modification	C:\Users\Admin\Pictures\TraceUndo.tiff	svhost.exe
File renamed	C:\Users\Admin\Pictures\CopyMount.tif => C:\Users\Admin\Pictures\CopyMount.tif.ReadInstructions	svhost.exe
File opened for modification	C:\Users\Admin\Pictures\DenyUninstall.tiff	svhost.exe
File renamed	C:\Users\Admin\Pictures\NewStep.png => C:\Users\Admin\Pictures\NewStep.png.ReadInstructions	svhost.exe
File opened for modification	C:\Users\Admin\Pictures\ResizeOpen.tiff	svhost.exe
File renamed	C:\Users\Admin\Pictures\SkipUnblock.png => C:\Users\Admin\Pictures\SkipUnblock.png.ReadInstructions	svhost.exe
File renamed	C:\Users\Admin\Pictures\TraceUndo.tiff => C:\Users\Admin\Pictures\TraceUndo.tiff.ReadInstructions	svhost.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:

svhost.exe

description ioc process

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

Processes:

svhost.exe

description ioc process

File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-2295526160-1155304984-640977766-1000\desktop.ini svhost.exe

description	ioc	process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-2295526160-1155304984-640977766-1000\desktop.ini	svhost.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:

svhost.exe

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

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

svhost.exe

pid	process
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe
3648	svhost.exe

Suspicious use of AdjustPrivilegeToken 63 IoCs

Processes:

wmic.exewmic.exewmic.exe

description	pid	process
Token: SeIncreaseQuotaPrivilege	2992	wmic.exe
Token: SeSecurityPrivilege	2992	wmic.exe
Token: SeTakeOwnershipPrivilege	2992	wmic.exe
Token: SeLoadDriverPrivilege	2992	wmic.exe
Token: SeSystemProfilePrivilege	2992	wmic.exe
Token: SeSystemtimePrivilege	2992	wmic.exe
Token: SeProfSingleProcessPrivilege	2992	wmic.exe
Token: SeIncBasePriorityPrivilege	2992	wmic.exe
Token: SeCreatePagefilePrivilege	2992	wmic.exe
Token: SeBackupPrivilege	2992	wmic.exe
Token: SeRestorePrivilege	2992	wmic.exe
Token: SeShutdownPrivilege	2992	wmic.exe
Token: SeDebugPrivilege	2992	wmic.exe
Token: SeSystemEnvironmentPrivilege	2992	wmic.exe
Token: SeRemoteShutdownPrivilege	2992	wmic.exe
Token: SeUndockPrivilege	2992	wmic.exe
Token: SeManageVolumePrivilege	2992	wmic.exe
Token: 33	2992	wmic.exe
Token: 34	2992	wmic.exe
Token: 35	2992	wmic.exe
Token: 36	2992	wmic.exe
Token: SeIncreaseQuotaPrivilege	4856	wmic.exe
Token: SeSecurityPrivilege	4856	wmic.exe
Token: SeTakeOwnershipPrivilege	4856	wmic.exe
Token: SeLoadDriverPrivilege	4856	wmic.exe
Token: SeSystemProfilePrivilege	4856	wmic.exe
Token: SeSystemtimePrivilege	4856	wmic.exe
Token: SeProfSingleProcessPrivilege	4856	wmic.exe
Token: SeIncBasePriorityPrivilege	4856	wmic.exe
Token: SeCreatePagefilePrivilege	4856	wmic.exe
Token: SeBackupPrivilege	4856	wmic.exe
Token: SeRestorePrivilege	4856	wmic.exe
Token: SeShutdownPrivilege	4856	wmic.exe
Token: SeDebugPrivilege	4856	wmic.exe
Token: SeSystemEnvironmentPrivilege	4856	wmic.exe
Token: SeRemoteShutdownPrivilege	4856	wmic.exe
Token: SeUndockPrivilege	4856	wmic.exe
Token: SeManageVolumePrivilege	4856	wmic.exe
Token: 33	4856	wmic.exe
Token: 34	4856	wmic.exe
Token: 35	4856	wmic.exe
Token: 36	4856	wmic.exe
Token: SeIncreaseQuotaPrivilege	2116	wmic.exe
Token: SeSecurityPrivilege	2116	wmic.exe
Token: SeTakeOwnershipPrivilege	2116	wmic.exe
Token: SeLoadDriverPrivilege	2116	wmic.exe
Token: SeSystemProfilePrivilege	2116	wmic.exe
Token: SeSystemtimePrivilege	2116	wmic.exe
Token: SeProfSingleProcessPrivilege	2116	wmic.exe
Token: SeIncBasePriorityPrivilege	2116	wmic.exe
Token: SeCreatePagefilePrivilege	2116	wmic.exe
Token: SeBackupPrivilege	2116	wmic.exe
Token: SeRestorePrivilege	2116	wmic.exe
Token: SeShutdownPrivilege	2116	wmic.exe
Token: SeDebugPrivilege	2116	wmic.exe
Token: SeSystemEnvironmentPrivilege	2116	wmic.exe
Token: SeRemoteShutdownPrivilege	2116	wmic.exe
Token: SeUndockPrivilege	2116	wmic.exe
Token: SeManageVolumePrivilege	2116	wmic.exe
Token: 33	2116	wmic.exe
Token: 34	2116	wmic.exe
Token: 35	2116	wmic.exe
Token: 36	2116	wmic.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

svhost.exe

description	pid	process	target process
PID 3648 wrote to memory of 2992	3648	svhost.exe	wmic.exe
PID 3648 wrote to memory of 2992	3648	svhost.exe	wmic.exe
PID 3648 wrote to memory of 2992	3648	svhost.exe	wmic.exe
PID 3648 wrote to memory of 4856	3648	svhost.exe	wmic.exe
PID 3648 wrote to memory of 4856	3648	svhost.exe	wmic.exe
PID 3648 wrote to memory of 4856	3648	svhost.exe	wmic.exe
PID 3648 wrote to memory of 2116	3648	svhost.exe	wmic.exe
PID 3648 wrote to memory of 2116	3648	svhost.exe	wmic.exe
PID 3648 wrote to memory of 2116	3648	svhost.exe	wmic.exe

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

Processes:

svhost.exe

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

C:\Users\Admin\AppData\Local\Temp\svhost.exe
"C:\Users\Admin\AppData\Local\Temp\svhost.exe"
1⤵
- UAC bypass
- 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:3648
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2992
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4856
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2116