medusalocker | 26af2222204fca27c0fdabf9eefbfdb638a8a9322b297119f85cce3c708090f0

General

Target

medusa.exe
Size

669KB
MD5

646698572afbbf24f50ec5681feb2db7
SHA1

70530bc23bad38e6aee66cbb2c2f58a96a18fb79
SHA256

26af2222204fca27c0fdabf9eefbfdb638a8a9322b297119f85cce3c708090f0
SHA512

89bad552a3c0d8b28550957872561d03bf239d2708d616f21cbf22e58ae749542b07eee00fedac6fdb83c5969f50ea0f56fc103264a164671a94e156f73f160a
SSDEEP

12288:dQA0FfTcwpBuV2UxqDmuiLZeUaoFi2XZWfGe615HhAZV8D4KD/KeX:Tuf4wTuV2Ux3uIZeUBi2Te6HWdKrKe

Score

10^/10

medusalocker evasion ransomware spyware stealer trojan

Malware Config

Extracted

Path

\Device\HarddiskVolume1\Boot\how_to_back_files.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; word-break: break-all; } .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;">7CD68861C68C364A52ED3F83D32D5D149CB8FB470F0FE40E1B76436F15ACD7DFC2857771DEB712D5CBBE8A6B5484100A96A6772DCAACDA503B8DDA5899F0B3C5<br>64076DE9535C545BED9D0126C602351A5BCE4784086876E7D38242769F1AA164EBC31A3A4F8B8980C86EF288279E905BA24C3D4A5664DC3BA0DEF5084D5D<br>A6A715FD784C4AAFA77CC58B177A2C430A89A6D750F2A7EF2EEC136300C400EFE7EE98A9AD53B033DC64A1E66D52B0D1E384A3A6C3A96F39810520D5CA26<br>D63A10D30077CA81B82D459ADD48D276C9FFD3A5A577611AE48570AFA220C03433BAFDB604D0FE8A34310D134B55FEC6B067A9F4C622A7B38C9992750706<br>6E10E193C8726100084DC64ADCF9E7B86CB2E327B083448E3D623BE7FEBD3B3F4E9A3C6721C459B4073A706C786F92EDF7BA472DFB1AB6DDE888490AE931<br>48675165738C565E360CADB5B5C705E205C03C8AEFF1B38B432074BF0E15569556084B186A21D9B049D383531319658BE8EB5B380227D6A983527F94AB37<br>B4583BFCA215ED79DBD4AF1E126E5550C55F4D8699514F1C8C7CD3EDE0B1676B271B205C10B0DD95A0C38F0CA177F111E2369670231D1DED917DBB03220B<br>6AD15BFF4B531CB39058B8FB8B0ABB4E854CA12E496C62DC6B363436FA102395DDD31D4502064EDD33DBD5FB36C4BA412E0BF7367C1C332BF84E3FC24B8B<br>1D6AF5D1C81EE86A28449570044E</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>qd7pcafncosqfqu3ha6fcx4h6sr7tzwagzpcdcnytiw3b6varaeqv5yd.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<br> </a> 4. Start a chat and follow the further instructions. <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> <p>* To contact us, create a new free email account on the site: <a href="https://protonmail.com">protonmail.com <br> <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="[email protected]

">[email protected]

href="[email protected]

">[email protected]

Signatures

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

MedusaLocker payload 1 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\svhost.exe	family_medusalocker

UAC bypass 3 TTPs 2 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

medusa.exe

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

Renames multiple (233) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware
Executes dropped EXE 1 IoCs

Processes:

svhost.exe

pid process

940 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
T1552.001
Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

medusa.exe

description ioc process

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

Processes:

medusa.exe

description ioc process

File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-983155329-280873152-1838004294-1000\desktop.ini medusa.exe

pid	process
940	svhost.exe

description	ioc	process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-983155329-280873152-1838004294-1000\desktop.ini	medusa.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:

medusa.exe

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

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

medusa.exe

pid	process
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe
1684	medusa.exe

Suspicious use of AdjustPrivilegeToken 63 IoCs

Processes:

wmic.exewmic.exewmic.exe

description	pid	process
Token: SeIncreaseQuotaPrivilege	2132	wmic.exe
Token: SeSecurityPrivilege	2132	wmic.exe
Token: SeTakeOwnershipPrivilege	2132	wmic.exe
Token: SeLoadDriverPrivilege	2132	wmic.exe
Token: SeSystemProfilePrivilege	2132	wmic.exe
Token: SeSystemtimePrivilege	2132	wmic.exe
Token: SeProfSingleProcessPrivilege	2132	wmic.exe
Token: SeIncBasePriorityPrivilege	2132	wmic.exe
Token: SeCreatePagefilePrivilege	2132	wmic.exe
Token: SeBackupPrivilege	2132	wmic.exe
Token: SeRestorePrivilege	2132	wmic.exe
Token: SeShutdownPrivilege	2132	wmic.exe
Token: SeDebugPrivilege	2132	wmic.exe
Token: SeSystemEnvironmentPrivilege	2132	wmic.exe
Token: SeRemoteShutdownPrivilege	2132	wmic.exe
Token: SeUndockPrivilege	2132	wmic.exe
Token: SeManageVolumePrivilege	2132	wmic.exe
Token: 33	2132	wmic.exe
Token: 34	2132	wmic.exe
Token: 35	2132	wmic.exe
Token: 36	2132	wmic.exe
Token: SeIncreaseQuotaPrivilege	3852	wmic.exe
Token: SeSecurityPrivilege	3852	wmic.exe
Token: SeTakeOwnershipPrivilege	3852	wmic.exe
Token: SeLoadDriverPrivilege	3852	wmic.exe
Token: SeSystemProfilePrivilege	3852	wmic.exe
Token: SeSystemtimePrivilege	3852	wmic.exe
Token: SeProfSingleProcessPrivilege	3852	wmic.exe
Token: SeIncBasePriorityPrivilege	3852	wmic.exe
Token: SeCreatePagefilePrivilege	3852	wmic.exe
Token: SeBackupPrivilege	3852	wmic.exe
Token: SeRestorePrivilege	3852	wmic.exe
Token: SeShutdownPrivilege	3852	wmic.exe
Token: SeDebugPrivilege	3852	wmic.exe
Token: SeSystemEnvironmentPrivilege	3852	wmic.exe
Token: SeRemoteShutdownPrivilege	3852	wmic.exe
Token: SeUndockPrivilege	3852	wmic.exe
Token: SeManageVolumePrivilege	3852	wmic.exe
Token: 33	3852	wmic.exe
Token: 34	3852	wmic.exe
Token: 35	3852	wmic.exe
Token: 36	3852	wmic.exe
Token: SeIncreaseQuotaPrivilege	32	wmic.exe
Token: SeSecurityPrivilege	32	wmic.exe
Token: SeTakeOwnershipPrivilege	32	wmic.exe
Token: SeLoadDriverPrivilege	32	wmic.exe
Token: SeSystemProfilePrivilege	32	wmic.exe
Token: SeSystemtimePrivilege	32	wmic.exe
Token: SeProfSingleProcessPrivilege	32	wmic.exe
Token: SeIncBasePriorityPrivilege	32	wmic.exe
Token: SeCreatePagefilePrivilege	32	wmic.exe
Token: SeBackupPrivilege	32	wmic.exe
Token: SeRestorePrivilege	32	wmic.exe
Token: SeShutdownPrivilege	32	wmic.exe
Token: SeDebugPrivilege	32	wmic.exe
Token: SeSystemEnvironmentPrivilege	32	wmic.exe
Token: SeRemoteShutdownPrivilege	32	wmic.exe
Token: SeUndockPrivilege	32	wmic.exe
Token: SeManageVolumePrivilege	32	wmic.exe
Token: 33	32	wmic.exe
Token: 34	32	wmic.exe
Token: 35	32	wmic.exe
Token: 36	32	wmic.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

medusa.exe

description	pid	process	target process
PID 1684 wrote to memory of 2132	1684	medusa.exe	wmic.exe
PID 1684 wrote to memory of 2132	1684	medusa.exe	wmic.exe
PID 1684 wrote to memory of 2132	1684	medusa.exe	wmic.exe
PID 1684 wrote to memory of 3852	1684	medusa.exe	wmic.exe
PID 1684 wrote to memory of 3852	1684	medusa.exe	wmic.exe
PID 1684 wrote to memory of 3852	1684	medusa.exe	wmic.exe
PID 1684 wrote to memory of 32	1684	medusa.exe	wmic.exe
PID 1684 wrote to memory of 32	1684	medusa.exe	wmic.exe
PID 1684 wrote to memory of 32	1684	medusa.exe	wmic.exe

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

Processes:

medusa.exe

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

C:\Users\Admin\AppData\Local\Temp\medusa.exe
"C:\Users\Admin\AppData\Local\Temp\medusa.exe"
1⤵
- UAC bypass
- Checks whether UAC is enabled
- Drops desktop.ini file(s)
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1684
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2132
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3852
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:32

C:\Users\Admin\AppData\Roaming\svhost.exe
C:\Users\Admin\AppData\Roaming\svhost.exe
1⤵
- Executes dropped EXE
PID:940

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\svhost.exe

Filesize
669KB

MD5
646698572afbbf24f50ec5681feb2db7

SHA1
70530bc23bad38e6aee66cbb2c2f58a96a18fb79

SHA256
26af2222204fca27c0fdabf9eefbfdb638a8a9322b297119f85cce3c708090f0

SHA512
89bad552a3c0d8b28550957872561d03bf239d2708d616f21cbf22e58ae749542b07eee00fedac6fdb83c5969f50ea0f56fc103264a164671a94e156f73f160a

Download Submit
C:\Users\Default\ntuser.dat.LOG2

Filesize
536B

MD5
6658f4baeaf85ed5344b282d043d41a1

SHA1
f75d627a1b8931f5755ba46bf3692063341413a6

SHA256
591dcb0e662cc217b3a43b54806ac0233b78e235b3473103578bd47629f569be

SHA512
f9725a1d1d5d9f538046953f7099c63a3cf11b830d534e27e0b45ee2aa66ec6cdc29d28d8a142bb24347dc4294b5639372586f92e1cc011781f2affd561741eb

Download Submit
\Device\HarddiskVolume1\Boot\how_to_back_files.html

Filesize
4KB

MD5
7cbf795936b36f7abbe170922f710341

SHA1
95e248270b7dc9948902ade42198f4c03b29e5ad

SHA256
200cbe3a3903f0e108f29e30a20f1abe151399a11654f9d4a959a770d37e479b

SHA512
60ceeadfbb7a45a892034b09d60733da11eee1ddd20addac94ccc123fb98b125590b46b38b819329ab42b583bb2bc789bb117e27adf2ba1d337aa20d13c46a2e

Download Submit

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads