medusalocker | 26af2222204fca27c0fdabf9eefbfdb638a8a9322b297119f85cce3c708090f0

Resubmissions

11-04-2024 18:57

240411-xl1ypsdc9v 10

28-03-2023 10:46

230328-mve3gscb91 10

Analysis

max time kernel
128s
max time network
120s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
11-04-2024 18:57

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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;">A0213FC85A0B4D7EDB0EFD78C63D8F4BBD46BC940F7F5C92C106294C2A84F97727C766BEFAE110BD39704F192B3DAA9EE69BF65FA1E8C609948114E3ED94D344<br>170DB17ACF1BC55039B7BF207C28870DE9400464375BCCCDC6364057234BF8DE9336AFC20C0DD91962B3D19B771AD8556823163738FBA53A2D1AEB2CC022<br>5B78E0B053C6043F8F9FC28BC5C426639733D7E1E52399752542CF883F563034645BB6D4FAC272B277D9937EF254DC451E07FB46D0A7187F4022390ABE19<br>1506A123DE0FF2873872114043274E3D15662748767B493DBD6E12EEA76392B26698EDE5669AD009909A46AB0E714DFD198F5DEED6186C64386B86B923BB<br>A2F23CFDC06667BF903A16053289F32178C77F6BD49852B9EEBA874B3A9906DB675683DABDD15FD1FC510EAA9970F495B938ADA74C03C1694C1AF8E2B161<br>EBECCE19BC116B3CF573DCDEBA31851F354E8124079399BD2F578B86F1F257346FB28D1D891FD11267619A8A91B0BF607E6BACF3CD898FE28C878700E43A<br>3330264C6C1A72192B183429C2AE1012EBC0B8C74B5309C32677DB37171F795832AD2DEA1D16D3AE5FB1CC341CCEBCF43082E74224B55F6F6E4EB7C0C0B3<br>5BC5351630CA42D70005173A8503A33A93421145DA2EC355FEA8F069D06053C066004EEFDCCBE75752467F78472B6CD5C6D297D03122283164D465746D07<br>7599E540ADFE7D0943CA682E5A81</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

resource	yara_rule
behavioral1/files/0x000900000001227e-898.dat	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

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

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

File Deletion
T1070.004

Inhibit System Recovery
T1490
Renames multiple (292) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

Executes dropped EXE 1 IoCs

pid	Process
2188	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

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

description	ioc	Process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-3787592910-3720486031-2929222812-1000\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

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

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

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

T1070.004

Inhibit System Recovery

T1490

pid	Process
2440	vssadmin.exe
2348	vssadmin.exe
2520	vssadmin.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe
1300	medusa.exe

Suspicious use of AdjustPrivilegeToken 63 IoCs

description	pid	Process
Token: SeBackupPrivilege	2968	vssvc.exe
Token: SeRestorePrivilege	2968	vssvc.exe
Token: SeAuditPrivilege	2968	vssvc.exe
Token: SeIncreaseQuotaPrivilege	2660	wmic.exe
Token: SeSecurityPrivilege	2660	wmic.exe
Token: SeTakeOwnershipPrivilege	2660	wmic.exe
Token: SeLoadDriverPrivilege	2660	wmic.exe
Token: SeSystemProfilePrivilege	2660	wmic.exe
Token: SeSystemtimePrivilege	2660	wmic.exe
Token: SeProfSingleProcessPrivilege	2660	wmic.exe
Token: SeIncBasePriorityPrivilege	2660	wmic.exe
Token: SeCreatePagefilePrivilege	2660	wmic.exe
Token: SeBackupPrivilege	2660	wmic.exe
Token: SeRestorePrivilege	2660	wmic.exe
Token: SeShutdownPrivilege	2660	wmic.exe
Token: SeDebugPrivilege	2660	wmic.exe
Token: SeSystemEnvironmentPrivilege	2660	wmic.exe
Token: SeRemoteShutdownPrivilege	2660	wmic.exe
Token: SeUndockPrivilege	2660	wmic.exe
Token: SeManageVolumePrivilege	2660	wmic.exe
Token: 33	2660	wmic.exe
Token: 34	2660	wmic.exe
Token: 35	2660	wmic.exe
Token: SeIncreaseQuotaPrivilege	2956	wmic.exe
Token: SeSecurityPrivilege	2956	wmic.exe
Token: SeTakeOwnershipPrivilege	2956	wmic.exe
Token: SeLoadDriverPrivilege	2956	wmic.exe
Token: SeSystemProfilePrivilege	2956	wmic.exe
Token: SeSystemtimePrivilege	2956	wmic.exe
Token: SeProfSingleProcessPrivilege	2956	wmic.exe
Token: SeIncBasePriorityPrivilege	2956	wmic.exe
Token: SeCreatePagefilePrivilege	2956	wmic.exe
Token: SeBackupPrivilege	2956	wmic.exe
Token: SeRestorePrivilege	2956	wmic.exe
Token: SeShutdownPrivilege	2956	wmic.exe
Token: SeDebugPrivilege	2956	wmic.exe
Token: SeSystemEnvironmentPrivilege	2956	wmic.exe
Token: SeRemoteShutdownPrivilege	2956	wmic.exe
Token: SeUndockPrivilege	2956	wmic.exe
Token: SeManageVolumePrivilege	2956	wmic.exe
Token: 33	2956	wmic.exe
Token: 34	2956	wmic.exe
Token: 35	2956	wmic.exe
Token: SeIncreaseQuotaPrivilege	2460	wmic.exe
Token: SeSecurityPrivilege	2460	wmic.exe
Token: SeTakeOwnershipPrivilege	2460	wmic.exe
Token: SeLoadDriverPrivilege	2460	wmic.exe
Token: SeSystemProfilePrivilege	2460	wmic.exe
Token: SeSystemtimePrivilege	2460	wmic.exe
Token: SeProfSingleProcessPrivilege	2460	wmic.exe
Token: SeIncBasePriorityPrivilege	2460	wmic.exe
Token: SeCreatePagefilePrivilege	2460	wmic.exe
Token: SeBackupPrivilege	2460	wmic.exe
Token: SeRestorePrivilege	2460	wmic.exe
Token: SeShutdownPrivilege	2460	wmic.exe
Token: SeDebugPrivilege	2460	wmic.exe
Token: SeSystemEnvironmentPrivilege	2460	wmic.exe
Token: SeRemoteShutdownPrivilege	2460	wmic.exe
Token: SeUndockPrivilege	2460	wmic.exe
Token: SeManageVolumePrivilege	2460	wmic.exe
Token: 33	2460	wmic.exe
Token: 34	2460	wmic.exe
Token: 35	2460	wmic.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 1300 wrote to memory of 2348	1300	medusa.exe	28
PID 1300 wrote to memory of 2348	1300	medusa.exe	28
PID 1300 wrote to memory of 2348	1300	medusa.exe	28
PID 1300 wrote to memory of 2348	1300	medusa.exe	28
PID 1300 wrote to memory of 2660	1300	medusa.exe	31
PID 1300 wrote to memory of 2660	1300	medusa.exe	31
PID 1300 wrote to memory of 2660	1300	medusa.exe	31
PID 1300 wrote to memory of 2660	1300	medusa.exe	31
PID 1300 wrote to memory of 2520	1300	medusa.exe	33
PID 1300 wrote to memory of 2520	1300	medusa.exe	33
PID 1300 wrote to memory of 2520	1300	medusa.exe	33
PID 1300 wrote to memory of 2520	1300	medusa.exe	33
PID 1300 wrote to memory of 2956	1300	medusa.exe	35
PID 1300 wrote to memory of 2956	1300	medusa.exe	35
PID 1300 wrote to memory of 2956	1300	medusa.exe	35
PID 1300 wrote to memory of 2956	1300	medusa.exe	35
PID 1300 wrote to memory of 2440	1300	medusa.exe	37
PID 1300 wrote to memory of 2440	1300	medusa.exe	37
PID 1300 wrote to memory of 2440	1300	medusa.exe	37
PID 1300 wrote to memory of 2440	1300	medusa.exe	37
PID 1300 wrote to memory of 2460	1300	medusa.exe	39
PID 1300 wrote to memory of 2460	1300	medusa.exe	39
PID 1300 wrote to memory of 2460	1300	medusa.exe	39
PID 1300 wrote to memory of 2460	1300	medusa.exe	39
PID 2092 wrote to memory of 2188	2092	taskeng.exe	45
PID 2092 wrote to memory of 2188	2092	taskeng.exe	45
PID 2092 wrote to memory of 2188	2092	taskeng.exe	45
PID 2092 wrote to memory of 2188	2092	taskeng.exe	45

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

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

Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

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:1300
- C:\Windows\SysWOW64\vssadmin.exe
  vssadmin.exe Delete Shadows /All /Quiet
  2⤵
  - Interacts with shadow copies
  PID:2348
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2660
- C:\Windows\SysWOW64\vssadmin.exe
  vssadmin.exe Delete Shadows /All /Quiet
  2⤵
  - Interacts with shadow copies
  PID:2520
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2956
- C:\Windows\SysWOW64\vssadmin.exe
  vssadmin.exe Delete Shadows /All /Quiet
  2⤵
  - Interacts with shadow copies
  PID:2440
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2460

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2968

C:\Windows\system32\taskeng.exe
taskeng.exe {5AD3A7A4-3C05-49B6-80F6-3FD942B5EAD6} S-1-5-21-3787592910-3720486031-2929222812-1000:HSNHLVYA\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2092
- C:\Users\Admin\AppData\Roaming\svhost.exe
  C:\Users\Admin\AppData\Roaming\svhost.exe
  2⤵
  - Executes dropped EXE
  PID:2188

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Indicator Removal

T1070

File Deletion

T1070.004

Modify Registry

T1112

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Inhibit System Recovery

T1490

Replay Monitor

Loading Replay Monitor...

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
503dcc2e8df380de64fbc34145012f3d

SHA1
18b5416757c765b453ca5af4dd8417f91adb8df5

SHA256
f03dd27002fc34819d38999955d809ac94e9cf42f47313385203495ae047ce9f

SHA512
2077448ff6b9eff3e82c92f89861b4d97e6b8d6c0c0fb346ddc5beba6c57d89f57839afc223c14de4dced29dc66f2e3326ef991d1d40853a255769ea8a2424a2

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

Filesize
4KB

MD5
1654deeb91f6f675947f1e0a6e69eb21

SHA1
d610a58f43c62265c001435a70bb85efc120cf89

SHA256
11200a07041fb40da756abe604c1a0678d143f8da89d8348834b928a14344db6

SHA512
ef4af2c81762fd9e11870ea8b6b89ad68a6bb95a1861b8e7236880c6c5376bf700e00929dca87085a456cedbdef44a80dd6b6e09298385ae11748993c57bd6ea

Download Submit