medusalocker | 8c0cc36cba7d54c1c225c95ef0a05f95ed317ffdb17e952e452e6555a719a927

General

Target

64_MEcip.exe
Size

666KB
MD5

623256c79ccd20a1319f553f269b3867
SHA1

a06b170b22424a87809d65171714a821d732831d
SHA256

8c0cc36cba7d54c1c225c95ef0a05f95ed317ffdb17e952e452e6555a719a927
SHA512

808cb0aa49799d33eb40e432d386b33341aadb220ff941dc5bd9d914baaafadd1c1dc646b24a8ff3a71890d1fd870f684876d8686909d2c902592d7b3fa81da4
SSDEEP

12288:ZYW1LNT35lDbK/LIVaN8+T7vwqyqhYMhWt918vulAbC9+m:dd35lDbKDIwWUDyqS5ommC9+

Score

10^/10

medusalocker evasion ransomware trojan

Malware Config

Extracted

Path

C:\!-Recovery_Instructions-!.html

Ransom Note

<!DOCTYPE html> <html lang="en"> <head> <meta charset='utf-8'> <meta name='viewport' content='width=device-width,initial-scale=1'> <title></title> <style> html, body { background-color: #1a1a1a; } body { padding-top: 1rem !important; font-size: 1.3rem; color: white; } #text h2 { font-size: 2rem; font-weight: 600; line-height: 1.125; } .container { max-width: 1152px; flex-grow: 1; margin: 0 auto; position: relative; width: auto; } .box { background-color: #242424; display: block; padding: 1.25rem; border: 1px solid #303030; } a { color: #00b4d8; text-decoration: none; } a:hover { text-decoration: underline; } li { margin-bottom: 10px; } </style> </head> <body> <div class='container'> <div class='box'> <div id='text'> <h2>If you get this message, your network was hacked!</h2> <p>After we gained full access to your servers, we first downloaded a large amount of sensitive data and then encrypted all the data stored on them.</p> <p>That includes personal information on your clients, partners, your personnel, accounting documents, and other crucial files that are necessary for your company to work normally.</p> <p>We used modern complicated algorithms, so you or any recovery service will not be able to decrypt files without our help, wasting time on these attempts instead of negotiations can be fatal for your company.</p> <p>Make sure to act within <span style='color:#f4a261;'>72</span> hours or the negotiations will be considered failed!</p> <p>Inform your superior management about what's going on.</p> <p> Contact us for pricing and decryption software.</p> <p> Contact us by email:<p> <h2>[email protected]</h2> </p>If you do not receive a response within 24 hours, please contact us at our additional contacts:</p> <p> 1) Download for TOX CHAT https://tox.chat/download.html</p> <p> 2) Open chat<p> <p>Add ID Chat: </p><h2>3C9D49B928FDC3C15F0314217623A71B865909B308576B4B0D10AEA62C98677B4A3F160D5C93</h2> <p>If we did not answer you, leave the chat enabled, the operator will contact you!<p> </p>To verify the possibility of the recovery of your files we can decrypted 1-3 file for free.</p> </p>Attach file to the letter (no more than 5Mb).</p> <h2>If you and us succeed the negotiations we will grant you:</h2> <ul> <li>complete confidentiality, we will keep in secret any information regarding to attack, your company will act as if nothing had happened.</li> <li>comprehensive information about vulnerabilities of your network and security report.</li> <li>software and instructions to decrypt all the data that was encrypted.</li> <li>all sensitive downloaded data will be permanently deleted from our cloud storage and we will provide an erasure log.</li> </ul> <h2>Our options if you act like nothing's happening, refuse to make a deal or fail the negotiations:</h2> <ul> <li>inform the media and independent journalists about what happened to your servers. To prove it we'll publish a chunk of private data that you should have ciphered if you care about potential breaches. Moreover, your company will inevitably take decent reputational loss which is hard to assess precisely.</li> <li>inform your clients, employees, partners by phone, e-mail, sms and social networks that you haven't prevent their data leakage. You will violate laws about private data protection.</li> <li>start DDOS attack on you website and infrastructures.</li> <li>personal data stored will be put on sale on the Darknet to find anyone interested to buy useful information regarding your company. It could be data mining agencies or your market competitors.</li> <li>publish all the discovered vulnerabilities found in your network, so anyone will do anything with it.</li> </ul> <h2>Why pay us?</h2> <p>We care about our reputation. You are welcome to google our cases up and be sure that we don't have a single case of failure to provide what we promissed.</p> <p>Turning this issue to a bug bounty will save your private information, reputation and will allow you to use the security report and avoid this kind of situations in future.</p> <h2>Your personal ID</p> Your ID: 21CE934249D6917491ABA98CD042ABC22BDB42F61BCE0726B596F079E479435BF38BC4DE11E26A281AF347AE7B0C325E9154694E0DBBD105C77A2F4A71EA56E5<br>49243612F37C62BE4E33021FBAF53C5A891A8F8BE1E75B7E3BC1B5CA61859D3FB6AD412FE5B6AB3B92D660D50F6B04F5C8BC86E367A64A771E2AD5597815<br>8CFF8E8143E5CBD25F0A2A6E3F757AC9DDA1D1A2C94968BCF37C63C3587375F2E7DCA094A08403E1D49E88F02EB5393EC311B88744320466879BFFA972A9<br>7DC684134D9FCDC80F6E231A39405935A302904C2F4C20EEC90CDCDF54DBE91C0D2AC247D6FB6F721521C0177BB71B7EB602A5C406BF15520B1B0945AA1A<br>4B538EE2F81B5FD8D13F6FC7BD2CA69F5D01CD87817D82687694625CB0E58841CB37AB9D077CB63AE2F4D9384DE0881C13603A5240CD37BB7032EF7424F9<br>667346884C17B3F8D020FB5E4D7B0115DC2D070257E9B17F52857FFB4242EABCAABFC976D9F6A84B34A0621E11A3A7CD3D8C9F5DAFBD9EAF8F4849F2E9E9<br>C5C8619FEE12395FF020B7CDAFE15A170B371A04AB7441D3BB87F46F41D4D53F9A7576D3A806A9DDB70195B2AAA452A569AE8307D399FC3BF7B969DFE9AC<br>7E97A6238287EB4C0356196194531A15D282AE61D11764F82227A1713B12BD9CBA707ECB44E2D3935939F8ED4D917B69F919ABFFF1D035E35D4CE75D7BB0<br>DEC9D46F97D14D3045DB3C7E1A22

Emails

<h2>[email protected]</h2>

URLs

https://tox.chat/download.html</p>

Signatures

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

MedusaLocker payload 2 IoCs

Processes:

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

UAC bypass 3 TTPs 2 IoCs

evasion trojan

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

64_MEcip.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	64_MEcip.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	64_MEcip.exe

Executes dropped EXE 1 IoCs

Processes:

svhost.exe

pid process

2508 svhost.exe
Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

64_MEcip.exe

description ioc process

Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64_MEcip.exe
Drops desktop.ini file(s) 1 IoCs

Processes:

64_MEcip.exe

description ioc process

File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-2971393436-602173351-1645505021-1000\desktop.ini 64_MEcip.exe

pid	process
2508	svhost.exe

description	ioc	process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-2971393436-602173351-1645505021-1000\desktop.ini	64_MEcip.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:

64_MEcip.exe

description	ioc	process
File opened (read-only)	\??\I:	64_MEcip.exe
File opened (read-only)	\??\Q:	64_MEcip.exe
File opened (read-only)	\??\S:	64_MEcip.exe
File opened (read-only)	\??\U:	64_MEcip.exe
File opened (read-only)	\??\X:	64_MEcip.exe
File opened (read-only)	\??\R:	64_MEcip.exe
File opened (read-only)	\??\B:	64_MEcip.exe
File opened (read-only)	\??\E:	64_MEcip.exe
File opened (read-only)	\??\J:	64_MEcip.exe
File opened (read-only)	\??\M:	64_MEcip.exe
File opened (read-only)	\??\N:	64_MEcip.exe
File opened (read-only)	\??\K:	64_MEcip.exe
File opened (read-only)	\??\P:	64_MEcip.exe
File opened (read-only)	\??\V:	64_MEcip.exe
File opened (read-only)	\??\Y:	64_MEcip.exe
File opened (read-only)	\??\O:	64_MEcip.exe
File opened (read-only)	\??\T:	64_MEcip.exe
File opened (read-only)	\??\W:	64_MEcip.exe
File opened (read-only)	\??\A:	64_MEcip.exe
File opened (read-only)	\??\F:	64_MEcip.exe
File opened (read-only)	\??\G:	64_MEcip.exe
File opened (read-only)	\??\H:	64_MEcip.exe
File opened (read-only)	\??\L:	64_MEcip.exe
File opened (read-only)	\??\Z:	64_MEcip.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:

64_MEcip.exe

pid	process
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe
1448	64_MEcip.exe

Suspicious use of AdjustPrivilegeToken 63 IoCs

Processes:

wmic.exewmic.exewmic.exe

description	pid	process
Token: SeIncreaseQuotaPrivilege	908	wmic.exe
Token: SeSecurityPrivilege	908	wmic.exe
Token: SeTakeOwnershipPrivilege	908	wmic.exe
Token: SeLoadDriverPrivilege	908	wmic.exe
Token: SeSystemProfilePrivilege	908	wmic.exe
Token: SeSystemtimePrivilege	908	wmic.exe
Token: SeProfSingleProcessPrivilege	908	wmic.exe
Token: SeIncBasePriorityPrivilege	908	wmic.exe
Token: SeCreatePagefilePrivilege	908	wmic.exe
Token: SeBackupPrivilege	908	wmic.exe
Token: SeRestorePrivilege	908	wmic.exe
Token: SeShutdownPrivilege	908	wmic.exe
Token: SeDebugPrivilege	908	wmic.exe
Token: SeSystemEnvironmentPrivilege	908	wmic.exe
Token: SeRemoteShutdownPrivilege	908	wmic.exe
Token: SeUndockPrivilege	908	wmic.exe
Token: SeManageVolumePrivilege	908	wmic.exe
Token: 33	908	wmic.exe
Token: 34	908	wmic.exe
Token: 35	908	wmic.exe
Token: 36	908	wmic.exe
Token: SeIncreaseQuotaPrivilege	4468	wmic.exe
Token: SeSecurityPrivilege	4468	wmic.exe
Token: SeTakeOwnershipPrivilege	4468	wmic.exe
Token: SeLoadDriverPrivilege	4468	wmic.exe
Token: SeSystemProfilePrivilege	4468	wmic.exe
Token: SeSystemtimePrivilege	4468	wmic.exe
Token: SeProfSingleProcessPrivilege	4468	wmic.exe
Token: SeIncBasePriorityPrivilege	4468	wmic.exe
Token: SeCreatePagefilePrivilege	4468	wmic.exe
Token: SeBackupPrivilege	4468	wmic.exe
Token: SeRestorePrivilege	4468	wmic.exe
Token: SeShutdownPrivilege	4468	wmic.exe
Token: SeDebugPrivilege	4468	wmic.exe
Token: SeSystemEnvironmentPrivilege	4468	wmic.exe
Token: SeRemoteShutdownPrivilege	4468	wmic.exe
Token: SeUndockPrivilege	4468	wmic.exe
Token: SeManageVolumePrivilege	4468	wmic.exe
Token: 33	4468	wmic.exe
Token: 34	4468	wmic.exe
Token: 35	4468	wmic.exe
Token: 36	4468	wmic.exe
Token: SeIncreaseQuotaPrivilege	4488	wmic.exe
Token: SeSecurityPrivilege	4488	wmic.exe
Token: SeTakeOwnershipPrivilege	4488	wmic.exe
Token: SeLoadDriverPrivilege	4488	wmic.exe
Token: SeSystemProfilePrivilege	4488	wmic.exe
Token: SeSystemtimePrivilege	4488	wmic.exe
Token: SeProfSingleProcessPrivilege	4488	wmic.exe
Token: SeIncBasePriorityPrivilege	4488	wmic.exe
Token: SeCreatePagefilePrivilege	4488	wmic.exe
Token: SeBackupPrivilege	4488	wmic.exe
Token: SeRestorePrivilege	4488	wmic.exe
Token: SeShutdownPrivilege	4488	wmic.exe
Token: SeDebugPrivilege	4488	wmic.exe
Token: SeSystemEnvironmentPrivilege	4488	wmic.exe
Token: SeRemoteShutdownPrivilege	4488	wmic.exe
Token: SeUndockPrivilege	4488	wmic.exe
Token: SeManageVolumePrivilege	4488	wmic.exe
Token: 33	4488	wmic.exe
Token: 34	4488	wmic.exe
Token: 35	4488	wmic.exe
Token: 36	4488	wmic.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

64_MEcip.exe

description	pid	process	target process
PID 1448 wrote to memory of 908	1448	64_MEcip.exe	wmic.exe
PID 1448 wrote to memory of 908	1448	64_MEcip.exe	wmic.exe
PID 1448 wrote to memory of 908	1448	64_MEcip.exe	wmic.exe
PID 1448 wrote to memory of 4468	1448	64_MEcip.exe	wmic.exe
PID 1448 wrote to memory of 4468	1448	64_MEcip.exe	wmic.exe
PID 1448 wrote to memory of 4468	1448	64_MEcip.exe	wmic.exe
PID 1448 wrote to memory of 4488	1448	64_MEcip.exe	wmic.exe
PID 1448 wrote to memory of 4488	1448	64_MEcip.exe	wmic.exe
PID 1448 wrote to memory of 4488	1448	64_MEcip.exe	wmic.exe

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

Processes:

64_MEcip.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	64_MEcip.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	64_MEcip.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1"	64_MEcip.exe

C:\Users\Admin\AppData\Local\Temp\64_MEcip.exe
"C:\Users\Admin\AppData\Local\Temp\64_MEcip.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:1448
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:908
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4468
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4488

C:\Users\Admin\AppData\Roaming\svhost.exe
C:\Users\Admin\AppData\Roaming\svhost.exe
1⤵
- Executes dropped EXE
PID:2508

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Bypass User Account Control

1

T1088

Defense Evasion

Bypass User Account Control

1

T1088

Disabling Security Tools

Modify Registry

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
666KB

MD5
623256c79ccd20a1319f553f269b3867

SHA1
a06b170b22424a87809d65171714a821d732831d

SHA256
8c0cc36cba7d54c1c225c95ef0a05f95ed317ffdb17e952e452e6555a719a927

SHA512
808cb0aa49799d33eb40e432d386b33341aadb220ff941dc5bd9d914baaafadd1c1dc646b24a8ff3a71890d1fd870f684876d8686909d2c902592d7b3fa81da4

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

Filesize
666KB

MD5
623256c79ccd20a1319f553f269b3867

SHA1
a06b170b22424a87809d65171714a821d732831d

SHA256
8c0cc36cba7d54c1c225c95ef0a05f95ed317ffdb17e952e452e6555a719a927

SHA512
808cb0aa49799d33eb40e432d386b33341aadb220ff941dc5bd9d914baaafadd1c1dc646b24a8ff3a71890d1fd870f684876d8686909d2c902592d7b3fa81da4

Download Submit
memory/908-132-0x0000000000000000-mapping.dmp

Download
memory/4468-133-0x0000000000000000-mapping.dmp

Download
memory/4488-134-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads