medusalocker | 34601e5edf184f46c37314559e0a361cbce3aadc451e09f8b84020232fa710ad

General

Target

Build.exe
Size

669KB
MD5

b446b1c86f3d27bb39783f9d3a112a40
SHA1

d9f66f8db27686f4f3b2c7d17557c84077ac801f
SHA256

1f5eefc1feb47e11e53f82055ca0921fc1b1299dffa7972c6faeff1904fdad1d
SHA512

c2b7682c265060c1c62be0b4dceba7fed6882b9fdc9cbbd1d379608a482bf215d81a2a3c03cc2df709bc936ee7d06ff1250dde92808bd0e0d1f1ee3410c35d9a

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;">CA8137EB96C768D50ED8DCE214A56E619CEB900374E2EE34B02455BFD8438FC96342F4AA8073491DFD7206493748B22964C5A1D78897DF4C04E7850340DDCF5F<br>4FFA2C43486F90059C7A702FCBDE92AC7CB30A875A478ECCE7BEF529E1A0A246DD66A01DA8D5D8DD62EE674EEFA2D8520489610941DC509683A043FC543B<br>63A2B97FF7D73FF4F57C414813CD0041E13FC5DB9C80930DDAE86548ABAC15F1BFD8E4F8FF0F6286250E1C2666BFCEE480F4B091CA10DB02C294CEDF7D8D<br>B4D66125BBEF32E9021ED453467E66DA60BC6C9D9DDF863EB1F2FCB2C34C870FFC7E3707F3158C57481433A18540D715C1DD4440935023709187AEA3E14B<br>EBD59B3114A69E411EF583CEF6B4A7ABC4CD5CA7B88B6AC867BA6FA2BC3847EE20946FEF65BDB82A5BEDE4D93B39EE7C1E2135C26B2A2541A16D3F549CA6<br>2442882EBB5E739E1BCB5BEB09FBBBCB63645DCF04D16C037D8765B18A0DC8BEAE218B51C3A6A6D1EC00295F210179CFDB422F1478DCC67F31DFE7F54DB1<br>638284062293F59200BCE0030F8272F629FC75F6F5D3203BFF123CDF46C4D6325B03A9C18224C5825DC9E491F078A55C5414C625CB9D2AE64CDCD7F27F5B<br>96B9087941E73968B1B6737A38D14164667D327FDD6F56FC7428603AB8EE6EF99FBF608A8631F2BED98E1FB9FC3934BC67880743E7C294DADD23B796AEF2<br>30FAB86CC9B6AD2B6C4C61C7632F</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 </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="ithelp05@decorous.cyou ">ithelp05@decorous.cyou </a> <br><a href="ithelp05@wholeness.business">ithelp05@wholeness.business</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="ithelp05@decorous.cyou

">ithelp05@decorous.cyou

href="ithelp05@wholeness.business">ithelp05@wholeness.business</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

1528 svhost.exe

pid	process
1528	svhost.exe

Modifies extensions of user files 3 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

Build.exe

description	ioc	process
File opened for modification	C:\Users\Admin\Pictures\InitializeInvoke.tiff	Build.exe
File renamed	C:\Users\Admin\Pictures\InitializeInvoke.tiff => C:\Users\Admin\Pictures\InitializeInvoke.tiff.LOCK	Build.exe
File renamed	C:\Users\Admin\Pictures\RemoveMount.raw => C:\Users\Admin\Pictures\RemoveMount.raw.LOCK	Build.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:

Build.exe

description ioc process

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

Processes:

Build.exe

description ioc process

File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-2955169046-2371869340-1800780948-1000\desktop.ini Build.exe

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

description	ioc	process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-2955169046-2371869340-1800780948-1000\desktop.ini	Build.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:

Build.exe

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

1004 vssadmin.exe
1684 vssadmin.exe
1068 vssadmin.exe

pid	process
1004	vssadmin.exe
1684	vssadmin.exe
1068	vssadmin.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

Build.exe

pid	process
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe
1072	Build.exe

Suspicious use of AdjustPrivilegeToken 63 IoCs

Processes:

vssvc.exewmic.exewmic.exewmic.exe

description	pid	process
Token: SeBackupPrivilege	1488	vssvc.exe
Token: SeRestorePrivilege	1488	vssvc.exe
Token: SeAuditPrivilege	1488	vssvc.exe
Token: SeIncreaseQuotaPrivilege	416	wmic.exe
Token: SeSecurityPrivilege	416	wmic.exe
Token: SeTakeOwnershipPrivilege	416	wmic.exe
Token: SeLoadDriverPrivilege	416	wmic.exe
Token: SeSystemProfilePrivilege	416	wmic.exe
Token: SeSystemtimePrivilege	416	wmic.exe
Token: SeProfSingleProcessPrivilege	416	wmic.exe
Token: SeIncBasePriorityPrivilege	416	wmic.exe
Token: SeCreatePagefilePrivilege	416	wmic.exe
Token: SeBackupPrivilege	416	wmic.exe
Token: SeRestorePrivilege	416	wmic.exe
Token: SeShutdownPrivilege	416	wmic.exe
Token: SeDebugPrivilege	416	wmic.exe
Token: SeSystemEnvironmentPrivilege	416	wmic.exe
Token: SeRemoteShutdownPrivilege	416	wmic.exe
Token: SeUndockPrivilege	416	wmic.exe
Token: SeManageVolumePrivilege	416	wmic.exe
Token: 33	416	wmic.exe
Token: 34	416	wmic.exe
Token: 35	416	wmic.exe
Token: SeIncreaseQuotaPrivilege	1148	wmic.exe
Token: SeSecurityPrivilege	1148	wmic.exe
Token: SeTakeOwnershipPrivilege	1148	wmic.exe
Token: SeLoadDriverPrivilege	1148	wmic.exe
Token: SeSystemProfilePrivilege	1148	wmic.exe
Token: SeSystemtimePrivilege	1148	wmic.exe
Token: SeProfSingleProcessPrivilege	1148	wmic.exe
Token: SeIncBasePriorityPrivilege	1148	wmic.exe
Token: SeCreatePagefilePrivilege	1148	wmic.exe
Token: SeBackupPrivilege	1148	wmic.exe
Token: SeRestorePrivilege	1148	wmic.exe
Token: SeShutdownPrivilege	1148	wmic.exe
Token: SeDebugPrivilege	1148	wmic.exe
Token: SeSystemEnvironmentPrivilege	1148	wmic.exe
Token: SeRemoteShutdownPrivilege	1148	wmic.exe
Token: SeUndockPrivilege	1148	wmic.exe
Token: SeManageVolumePrivilege	1148	wmic.exe
Token: 33	1148	wmic.exe
Token: 34	1148	wmic.exe
Token: 35	1148	wmic.exe
Token: SeIncreaseQuotaPrivilege	1720	wmic.exe
Token: SeSecurityPrivilege	1720	wmic.exe
Token: SeTakeOwnershipPrivilege	1720	wmic.exe
Token: SeLoadDriverPrivilege	1720	wmic.exe
Token: SeSystemProfilePrivilege	1720	wmic.exe
Token: SeSystemtimePrivilege	1720	wmic.exe
Token: SeProfSingleProcessPrivilege	1720	wmic.exe
Token: SeIncBasePriorityPrivilege	1720	wmic.exe
Token: SeCreatePagefilePrivilege	1720	wmic.exe
Token: SeBackupPrivilege	1720	wmic.exe
Token: SeRestorePrivilege	1720	wmic.exe
Token: SeShutdownPrivilege	1720	wmic.exe
Token: SeDebugPrivilege	1720	wmic.exe
Token: SeSystemEnvironmentPrivilege	1720	wmic.exe
Token: SeRemoteShutdownPrivilege	1720	wmic.exe
Token: SeUndockPrivilege	1720	wmic.exe
Token: SeManageVolumePrivilege	1720	wmic.exe
Token: 33	1720	wmic.exe
Token: 34	1720	wmic.exe
Token: 35	1720	wmic.exe

Suspicious use of WriteProcessMemory 28 IoCs

Processes:

Build.exetaskeng.exe

description	pid	process	target process
PID 1072 wrote to memory of 1684	1072	Build.exe	vssadmin.exe
PID 1072 wrote to memory of 1684	1072	Build.exe	vssadmin.exe
PID 1072 wrote to memory of 1684	1072	Build.exe	vssadmin.exe
PID 1072 wrote to memory of 1684	1072	Build.exe	vssadmin.exe
PID 1072 wrote to memory of 416	1072	Build.exe	wmic.exe
PID 1072 wrote to memory of 416	1072	Build.exe	wmic.exe
PID 1072 wrote to memory of 416	1072	Build.exe	wmic.exe
PID 1072 wrote to memory of 416	1072	Build.exe	wmic.exe
PID 1072 wrote to memory of 1068	1072	Build.exe	vssadmin.exe
PID 1072 wrote to memory of 1068	1072	Build.exe	vssadmin.exe
PID 1072 wrote to memory of 1068	1072	Build.exe	vssadmin.exe
PID 1072 wrote to memory of 1068	1072	Build.exe	vssadmin.exe
PID 1072 wrote to memory of 1148	1072	Build.exe	wmic.exe
PID 1072 wrote to memory of 1148	1072	Build.exe	wmic.exe
PID 1072 wrote to memory of 1148	1072	Build.exe	wmic.exe
PID 1072 wrote to memory of 1148	1072	Build.exe	wmic.exe
PID 1072 wrote to memory of 1004	1072	Build.exe	vssadmin.exe
PID 1072 wrote to memory of 1004	1072	Build.exe	vssadmin.exe
PID 1072 wrote to memory of 1004	1072	Build.exe	vssadmin.exe
PID 1072 wrote to memory of 1004	1072	Build.exe	vssadmin.exe
PID 1072 wrote to memory of 1720	1072	Build.exe	wmic.exe
PID 1072 wrote to memory of 1720	1072	Build.exe	wmic.exe
PID 1072 wrote to memory of 1720	1072	Build.exe	wmic.exe
PID 1072 wrote to memory of 1720	1072	Build.exe	wmic.exe
PID 700 wrote to memory of 1528	700	taskeng.exe	svhost.exe
PID 700 wrote to memory of 1528	700	taskeng.exe	svhost.exe
PID 700 wrote to memory of 1528	700	taskeng.exe	svhost.exe
PID 700 wrote to memory of 1528	700	taskeng.exe	svhost.exe

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

Processes:

Build.exe

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

C:\Users\Admin\AppData\Local\Temp\Build.exe
"C:\Users\Admin\AppData\Local\Temp\Build.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:1072

C:\Windows\SysWOW64\vssadmin.exe
vssadmin.exe Delete Shadows /All /Quiet
2⤵
- Interacts with shadow copies
PID:1684

C:\Windows\SysWOW64\Wbem\wmic.exe
wmic.exe SHADOWCOPY /nointeractive
2⤵
- Suspicious use of AdjustPrivilegeToken
PID:416

C:\Windows\SysWOW64\vssadmin.exe
vssadmin.exe Delete Shadows /All /Quiet
2⤵
- Interacts with shadow copies
PID:1068

C:\Windows\SysWOW64\Wbem\wmic.exe
wmic.exe SHADOWCOPY /nointeractive
2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1148

C:\Windows\SysWOW64\vssadmin.exe
vssadmin.exe Delete Shadows /All /Quiet
2⤵
- Interacts with shadow copies
PID:1004

C:\Windows\SysWOW64\Wbem\wmic.exe
wmic.exe SHADOWCOPY /nointeractive
2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1720

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1488

C:\Windows\system32\taskeng.exe
taskeng.exe {127E17C9-FC23-4ECD-B1F2-EA1958070B71} S-1-5-21-2955169046-2371869340-1800780948-1000:UKNHJUQT\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:700

C:\Users\Admin\AppData\Roaming\svhost.exe
C:\Users\Admin\AppData\Roaming\svhost.exe
2⤵
- Executes dropped EXE
PID:1528

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

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Downloads

C:\Users\Admin\AppData\Roaming\svhost.exe
MD5
b446b1c86f3d27bb39783f9d3a112a40

SHA1
d9f66f8db27686f4f3b2c7d17557c84077ac801f

SHA256
1f5eefc1feb47e11e53f82055ca0921fc1b1299dffa7972c6faeff1904fdad1d

SHA512
c2b7682c265060c1c62be0b4dceba7fed6882b9fdc9cbbd1d379608a482bf215d81a2a3c03cc2df709bc936ee7d06ff1250dde92808bd0e0d1f1ee3410c35d9a

Download Submit
C:\Users\Admin\AppData\Roaming\svhost.exe
MD5
b446b1c86f3d27bb39783f9d3a112a40

SHA1
d9f66f8db27686f4f3b2c7d17557c84077ac801f

SHA256
1f5eefc1feb47e11e53f82055ca0921fc1b1299dffa7972c6faeff1904fdad1d

SHA512
c2b7682c265060c1c62be0b4dceba7fed6882b9fdc9cbbd1d379608a482bf215d81a2a3c03cc2df709bc936ee7d06ff1250dde92808bd0e0d1f1ee3410c35d9a

Download Submit
memory/416-56-0x0000000000000000-mapping.dmp

Download
memory/1004-59-0x0000000000000000-mapping.dmp

Download
memory/1068-57-0x0000000000000000-mapping.dmp

Download
memory/1072-54-0x0000000075B71000-0x0000000075B73000-memory.dmp

Filesize
8KB

Download
memory/1148-58-0x0000000000000000-mapping.dmp

Download
memory/1528-62-0x0000000000000000-mapping.dmp

Download
memory/1684-55-0x0000000000000000-mapping.dmp

Download
memory/1720-60-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads