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

\??\Z:\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;">E633913101D05DB377453BBD5B76BAFD01022D5BAF91A6AD651A3820C1F162C2F3FB7473F5E01C060179495CF5E31B16A297B2FC6CC20E525F5F44AE88E68A38<br>B917EE30F047CDC57C75304455A0BC44E29F0CABBB5667277CA82547C489C878B2E52297AFAC769F91D21C3513C6B14312C6DA363E225C314EF53B62E28D<br>28FE8A43E608D270FD1691A7B0632E1257D0328B0AEDB07421DAEB2C94046DFA2101AF709FF41735115AA0C20B506941B7147B58FDCEB15787A2486ACDBE<br>C8A30021691DD97F0AFD868EA215682B9F19AD553A78FBEE4F5A86A5C23E154E52E4A1C36BAB8E494BEEC5F471FBB32730E852E6388A85F3E6FF4FDD96D6<br>FE95BCE92F8886B683A95A44C14ADE487F345E0ECF0C247E818209980003552989E9B00CD8558FE03FC1C027DE42516243EAB7EE212FA8188FC1C6911F1E<br>B3EC89B27A8677C2948653F6C80033CD2AA9D657C3514B324596EDCC17AB685E838A4FF6F681CC562FCB50A71EC28AEAF3473B1B50DD28C3C3B1E3D382FC<br>1B66CC8EC99904F708A1C817CD5DB4BF7B60B47F8CC59F269C1282EE4D01E80D5B2CB1E0D8B46B7C1A43FEC3047EBA0DBB9715690B645D4EEE479ACEDAA0<br>B0BC44BC34711BF7F4B3598F730BEEDA3920658C8976490E43A6946B7A44D4B78763D5C5A794730446232EA479796F839B2102613E0C47E65378779CB5D5<br>FA6E6DD053F6C8423DE45C98E99F</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

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
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
Executes dropped EXE 1 IoCs

Processes:

svhost.exe

pid process

1712 svhost.exe

pid	process
1712	svhost.exe

Modifies extensions of user files 6 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

rb.exe

description	ioc	process
File renamed	C:\Users\Admin\Pictures\ExitUse.tif => C:\Users\Admin\Pictures\ExitUse.tif.reads	rb.exe
File renamed	C:\Users\Admin\Pictures\GetGroup.tif => C:\Users\Admin\Pictures\GetGroup.tif.reads	rb.exe
File renamed	C:\Users\Admin\Pictures\SkipSelect.raw => C:\Users\Admin\Pictures\SkipSelect.raw.reads	rb.exe
File renamed	C:\Users\Admin\Pictures\SyncSet.raw => C:\Users\Admin\Pictures\SyncSet.raw.reads	rb.exe
File opened for modification	C:\Users\Admin\Pictures\DenyInvoke.tiff	rb.exe
File renamed	C:\Users\Admin\Pictures\DenyInvoke.tiff => C:\Users\Admin\Pictures\DenyInvoke.tiff.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-1-5-21-2955169046-2371869340-1800780948-1000\desktop.ini rb.exe

description	ioc	process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-2955169046-2371869340-1800780948-1000\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)	\??\Z:	rb.exe
File opened (read-only)	\??\A:	rb.exe
File opened (read-only)	\??\S:	rb.exe
File opened (read-only)	\??\U:	rb.exe
File opened (read-only)	\??\V:	rb.exe
File opened (read-only)	\??\Y:	rb.exe
File opened (read-only)	\??\N:	rb.exe
File opened (read-only)	\??\O:	rb.exe
File opened (read-only)	\??\Q:	rb.exe
File opened (read-only)	\??\B:	rb.exe
File opened (read-only)	\??\F:	rb.exe
File opened (read-only)	\??\G:	rb.exe
File opened (read-only)	\??\K:	rb.exe
File opened (read-only)	\??\M:	rb.exe
File opened (read-only)	\??\R:	rb.exe
File opened (read-only)	\??\T:	rb.exe
File opened (read-only)	\??\X:	rb.exe
File opened (read-only)	\??\P:	rb.exe
File opened (read-only)	\??\W:	rb.exe
File opened (read-only)	\??\E:	rb.exe
File opened (read-only)	\??\H:	rb.exe
File opened (read-only)	\??\I:	rb.exe
File opened (read-only)	\??\J:	rb.exe
File opened (read-only)	\??\L:	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

1204 vssadmin.exe
1060 vssadmin.exe
1276 vssadmin.exe

pid	process
1204	vssadmin.exe
1060	vssadmin.exe
1276	vssadmin.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

rb.exe

pid	process
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe
1564	rb.exe

Suspicious use of AdjustPrivilegeToken 63 IoCs

Processes:

vssvc.exewmic.exewmic.exewmic.exe

description	pid	process
Token: SeBackupPrivilege	1864	vssvc.exe
Token: SeRestorePrivilege	1864	vssvc.exe
Token: SeAuditPrivilege	1864	vssvc.exe
Token: SeIncreaseQuotaPrivilege	436	wmic.exe
Token: SeSecurityPrivilege	436	wmic.exe
Token: SeTakeOwnershipPrivilege	436	wmic.exe
Token: SeLoadDriverPrivilege	436	wmic.exe
Token: SeSystemProfilePrivilege	436	wmic.exe
Token: SeSystemtimePrivilege	436	wmic.exe
Token: SeProfSingleProcessPrivilege	436	wmic.exe
Token: SeIncBasePriorityPrivilege	436	wmic.exe
Token: SeCreatePagefilePrivilege	436	wmic.exe
Token: SeBackupPrivilege	436	wmic.exe
Token: SeRestorePrivilege	436	wmic.exe
Token: SeShutdownPrivilege	436	wmic.exe
Token: SeDebugPrivilege	436	wmic.exe
Token: SeSystemEnvironmentPrivilege	436	wmic.exe
Token: SeRemoteShutdownPrivilege	436	wmic.exe
Token: SeUndockPrivilege	436	wmic.exe
Token: SeManageVolumePrivilege	436	wmic.exe
Token: 33	436	wmic.exe
Token: 34	436	wmic.exe
Token: 35	436	wmic.exe
Token: SeIncreaseQuotaPrivilege	1452	wmic.exe
Token: SeSecurityPrivilege	1452	wmic.exe
Token: SeTakeOwnershipPrivilege	1452	wmic.exe
Token: SeLoadDriverPrivilege	1452	wmic.exe
Token: SeSystemProfilePrivilege	1452	wmic.exe
Token: SeSystemtimePrivilege	1452	wmic.exe
Token: SeProfSingleProcessPrivilege	1452	wmic.exe
Token: SeIncBasePriorityPrivilege	1452	wmic.exe
Token: SeCreatePagefilePrivilege	1452	wmic.exe
Token: SeBackupPrivilege	1452	wmic.exe
Token: SeRestorePrivilege	1452	wmic.exe
Token: SeShutdownPrivilege	1452	wmic.exe
Token: SeDebugPrivilege	1452	wmic.exe
Token: SeSystemEnvironmentPrivilege	1452	wmic.exe
Token: SeRemoteShutdownPrivilege	1452	wmic.exe
Token: SeUndockPrivilege	1452	wmic.exe
Token: SeManageVolumePrivilege	1452	wmic.exe
Token: 33	1452	wmic.exe
Token: 34	1452	wmic.exe
Token: 35	1452	wmic.exe
Token: SeIncreaseQuotaPrivilege	1828	wmic.exe
Token: SeSecurityPrivilege	1828	wmic.exe
Token: SeTakeOwnershipPrivilege	1828	wmic.exe
Token: SeLoadDriverPrivilege	1828	wmic.exe
Token: SeSystemProfilePrivilege	1828	wmic.exe
Token: SeSystemtimePrivilege	1828	wmic.exe
Token: SeProfSingleProcessPrivilege	1828	wmic.exe
Token: SeIncBasePriorityPrivilege	1828	wmic.exe
Token: SeCreatePagefilePrivilege	1828	wmic.exe
Token: SeBackupPrivilege	1828	wmic.exe
Token: SeRestorePrivilege	1828	wmic.exe
Token: SeShutdownPrivilege	1828	wmic.exe
Token: SeDebugPrivilege	1828	wmic.exe
Token: SeSystemEnvironmentPrivilege	1828	wmic.exe
Token: SeRemoteShutdownPrivilege	1828	wmic.exe
Token: SeUndockPrivilege	1828	wmic.exe
Token: SeManageVolumePrivilege	1828	wmic.exe
Token: 33	1828	wmic.exe
Token: 34	1828	wmic.exe
Token: 35	1828	wmic.exe

Suspicious use of WriteProcessMemory 28 IoCs

Processes:

rb.exetaskeng.exe

description	pid	process	target process
PID 1564 wrote to memory of 1204	1564	rb.exe	vssadmin.exe
PID 1564 wrote to memory of 1204	1564	rb.exe	vssadmin.exe
PID 1564 wrote to memory of 1204	1564	rb.exe	vssadmin.exe
PID 1564 wrote to memory of 1204	1564	rb.exe	vssadmin.exe
PID 1564 wrote to memory of 436	1564	rb.exe	wmic.exe
PID 1564 wrote to memory of 436	1564	rb.exe	wmic.exe
PID 1564 wrote to memory of 436	1564	rb.exe	wmic.exe
PID 1564 wrote to memory of 436	1564	rb.exe	wmic.exe
PID 1564 wrote to memory of 1060	1564	rb.exe	vssadmin.exe
PID 1564 wrote to memory of 1060	1564	rb.exe	vssadmin.exe
PID 1564 wrote to memory of 1060	1564	rb.exe	vssadmin.exe
PID 1564 wrote to memory of 1060	1564	rb.exe	vssadmin.exe
PID 1564 wrote to memory of 1452	1564	rb.exe	wmic.exe
PID 1564 wrote to memory of 1452	1564	rb.exe	wmic.exe
PID 1564 wrote to memory of 1452	1564	rb.exe	wmic.exe
PID 1564 wrote to memory of 1452	1564	rb.exe	wmic.exe
PID 1564 wrote to memory of 1276	1564	rb.exe	vssadmin.exe
PID 1564 wrote to memory of 1276	1564	rb.exe	vssadmin.exe
PID 1564 wrote to memory of 1276	1564	rb.exe	vssadmin.exe
PID 1564 wrote to memory of 1276	1564	rb.exe	vssadmin.exe
PID 1564 wrote to memory of 1828	1564	rb.exe	wmic.exe
PID 1564 wrote to memory of 1828	1564	rb.exe	wmic.exe
PID 1564 wrote to memory of 1828	1564	rb.exe	wmic.exe
PID 1564 wrote to memory of 1828	1564	rb.exe	wmic.exe
PID 756 wrote to memory of 1712	756	taskeng.exe	svhost.exe
PID 756 wrote to memory of 1712	756	taskeng.exe	svhost.exe
PID 756 wrote to memory of 1712	756	taskeng.exe	svhost.exe
PID 756 wrote to memory of 1712	756	taskeng.exe	svhost.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:1564

C:\Windows\SysWOW64\vssadmin.exe
vssadmin.exe Delete Shadows /All /Quiet
2⤵
- Interacts with shadow copies
PID:1204

C:\Windows\SysWOW64\Wbem\wmic.exe
wmic.exe SHADOWCOPY /nointeractive
2⤵
- Suspicious use of AdjustPrivilegeToken
PID:436

C:\Windows\SysWOW64\vssadmin.exe
vssadmin.exe Delete Shadows /All /Quiet
2⤵
- Interacts with shadow copies
PID:1060

C:\Windows\SysWOW64\Wbem\wmic.exe
wmic.exe SHADOWCOPY /nointeractive
2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1452

C:\Windows\SysWOW64\vssadmin.exe
vssadmin.exe Delete Shadows /All /Quiet
2⤵
- Interacts with shadow copies
PID:1276

C:\Windows\SysWOW64\Wbem\wmic.exe
wmic.exe SHADOWCOPY /nointeractive
2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1828

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1864

C:\Windows\system32\taskeng.exe
taskeng.exe {ADEA1B52-D987-4ECB-9F1E-638939764176} S-1-5-21-2955169046-2371869340-1800780948-1000:UKNHJUQT\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:756

C:\Users\Admin\AppData\Roaming\svhost.exe
C:\Users\Admin\AppData\Roaming\svhost.exe
2⤵
- Executes dropped EXE
PID:1712

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Bypass User Account Control

1

T1088

Defense Evasion

Bypass User Account Control

1

T1088

Disabling Security Tools

1

T1089

Modify Registry

2

T1112

File Deletion

2

T1107

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

3

T1082

Query Registry

1

T1012

Peripheral Device Discovery

1

T1120

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

Inhibit System Recovery

2

T1490

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Roaming\svhost.exe
MD5
ae286ff258c5ec1d15a4fd3f64875d5b

SHA1
576b9e76e385b389f859ee4bde2d12776bbaedca

SHA256
ce0facb2c24c71a20117e27af3aed9d6815500eeadba6e79b472bef539d82769

SHA512
f2cf299e20571701ab7a7ad82103317279e8378f114e3de76b22580eb5e8263a025af1fb653b27323645e0ac63983dcbf6f609154a16e8e9d6c81531c369183b

Download Submit
C:\Users\Admin\AppData\Roaming\svhost.exe
MD5
ae286ff258c5ec1d15a4fd3f64875d5b

SHA1
576b9e76e385b389f859ee4bde2d12776bbaedca

SHA256
ce0facb2c24c71a20117e27af3aed9d6815500eeadba6e79b472bef539d82769

SHA512
f2cf299e20571701ab7a7ad82103317279e8378f114e3de76b22580eb5e8263a025af1fb653b27323645e0ac63983dcbf6f609154a16e8e9d6c81531c369183b

Download Submit
memory/436-56-0x0000000000000000-mapping.dmp

Download
memory/1060-57-0x0000000000000000-mapping.dmp

Download
memory/1204-55-0x0000000000000000-mapping.dmp

Download
memory/1276-59-0x0000000000000000-mapping.dmp

Download
memory/1452-58-0x0000000000000000-mapping.dmp

Download
memory/1564-54-0x00000000768A1000-0x00000000768A3000-memory.dmp

Filesize
8KB

Download
memory/1712-62-0x0000000000000000-mapping.dmp

Download
memory/1828-60-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads