medusalocker | 34601e5edf184f46c37314559e0a361cbce3aadc451e09f8b84020232fa710ad

Analysis

max time kernel
127s
max time network
136s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
24-12-2024 13:15

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General

Target

Build.exe
Size

669KB
MD5

b446b1c86f3d27bb39783f9d3a112a40
SHA1

d9f66f8db27686f4f3b2c7d17557c84077ac801f
SHA256

1f5eefc1feb47e11e53f82055ca0921fc1b1299dffa7972c6faeff1904fdad1d
SHA512

c2b7682c265060c1c62be0b4dceba7fed6882b9fdc9cbbd1d379608a482bf215d81a2a3c03cc2df709bc936ee7d06ff1250dde92808bd0e0d1f1ee3410c35d9a
SSDEEP

12288:dQA0FfTcwpBuV2UxqDmuiLZeUaoFi2XZWfGe615HhAZV8DiKD/KeX:Tuf4wTuV2Ux3uIZeUBi2Te6HWPKrKe

Score

10^/10

medusalocker discovery evasion ransomware spyware stealer trojan

Malware Config

Extracted

Path

\Device\HarddiskVolume1\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;">EB5B63A631414E4DF82EF2CC6DA38200C4FAED6AF20ECA31D46356722F6802C1999FC31D6688D612BACDAF76EAA0508CCC9A825587044BD24D32E0D316AC61E2<br>473F12DF05C18750A607AE741567ED446AF036A3B28C72F9816C61EBB96E09BA06491E16BD5A110585BF568E6722825536521893E977F58A2BCFF224C057<br>5AECF1A370776087771AC65B1FA684021C92BB40B657276D8E864AEF3A2D956A0992B80FF07DB1EF3D63619F770538E8B4EF476AC399DD09840D06220E4F<br>E11B9EECCC19B8E3296BD16A039303158D08C95EFE82D80BCD30F0332E27B904F1CA11131212306529CD9751808E836C211836828859CA7E0512096B73A7<br>DC8C56AB2AA10541E4F36800654281FA57F8115DDFDB0584BC49FE66C2EEC357E00D224878082D9ABD4A2429F15EC87EB145F7746901F44906287C05B53C<br>0098738BD62A625DEEFB7656AEF5EEDDF46AF80A1D41793254EF41C165F03B95612408E149C47DF4A68605EE03DC3F5FD8486E0B19FACDE41466E904F080<br>11285A02A62551504FF57B329134E23A670EDD36A5926DBAA63B2F0274431BA7ED36F1376A632C3C3BC8B136E51A831BD91E448E602A8B206EE054C670BA<br>ACC023968C20AE88845B13AA6C2C2E7FF211FBE58DF5DDC6A98F885383F27058C78983152AD78FC1473C9D0CE1A3AE36AFCE049F91C292901F047E896243<br>A02BFD948C569F58D6EEB7865C50</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="[email protected] ">[email protected] </a> <br><a href="[email protected]">[email protected]</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="[email protected]

">[email protected]

href="[email protected]">[email protected]</a>

Signatures

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

MedusaLocker payload 1 IoCs

resource	yara_rule
behavioral4/files/0x000c000000023b1b-686.dat	family_medusalocker

Medusalocker 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"	Build.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	Build.exe

Renames multiple (221) 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
2376	svhost.exe

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

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"	Build.exe

Drops desktop.ini file(s) 1 IoCs

description	ioc	Process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-3227495264-2217614367-4027411560-1000\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

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

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Build.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wmic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wmic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wmic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svhost.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe
1100	Build.exe

Suspicious use of AdjustPrivilegeToken 63 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	5076	wmic.exe
Token: SeSecurityPrivilege	5076	wmic.exe
Token: SeTakeOwnershipPrivilege	5076	wmic.exe
Token: SeLoadDriverPrivilege	5076	wmic.exe
Token: SeSystemProfilePrivilege	5076	wmic.exe
Token: SeSystemtimePrivilege	5076	wmic.exe
Token: SeProfSingleProcessPrivilege	5076	wmic.exe
Token: SeIncBasePriorityPrivilege	5076	wmic.exe
Token: SeCreatePagefilePrivilege	5076	wmic.exe
Token: SeBackupPrivilege	5076	wmic.exe
Token: SeRestorePrivilege	5076	wmic.exe
Token: SeShutdownPrivilege	5076	wmic.exe
Token: SeDebugPrivilege	5076	wmic.exe
Token: SeSystemEnvironmentPrivilege	5076	wmic.exe
Token: SeRemoteShutdownPrivilege	5076	wmic.exe
Token: SeUndockPrivilege	5076	wmic.exe
Token: SeManageVolumePrivilege	5076	wmic.exe
Token: 33	5076	wmic.exe
Token: 34	5076	wmic.exe
Token: 35	5076	wmic.exe
Token: 36	5076	wmic.exe
Token: SeIncreaseQuotaPrivilege	2732	wmic.exe
Token: SeSecurityPrivilege	2732	wmic.exe
Token: SeTakeOwnershipPrivilege	2732	wmic.exe
Token: SeLoadDriverPrivilege	2732	wmic.exe
Token: SeSystemProfilePrivilege	2732	wmic.exe
Token: SeSystemtimePrivilege	2732	wmic.exe
Token: SeProfSingleProcessPrivilege	2732	wmic.exe
Token: SeIncBasePriorityPrivilege	2732	wmic.exe
Token: SeCreatePagefilePrivilege	2732	wmic.exe
Token: SeBackupPrivilege	2732	wmic.exe
Token: SeRestorePrivilege	2732	wmic.exe
Token: SeShutdownPrivilege	2732	wmic.exe
Token: SeDebugPrivilege	2732	wmic.exe
Token: SeSystemEnvironmentPrivilege	2732	wmic.exe
Token: SeRemoteShutdownPrivilege	2732	wmic.exe
Token: SeUndockPrivilege	2732	wmic.exe
Token: SeManageVolumePrivilege	2732	wmic.exe
Token: 33	2732	wmic.exe
Token: 34	2732	wmic.exe
Token: 35	2732	wmic.exe
Token: 36	2732	wmic.exe
Token: SeIncreaseQuotaPrivilege	2424	wmic.exe
Token: SeSecurityPrivilege	2424	wmic.exe
Token: SeTakeOwnershipPrivilege	2424	wmic.exe
Token: SeLoadDriverPrivilege	2424	wmic.exe
Token: SeSystemProfilePrivilege	2424	wmic.exe
Token: SeSystemtimePrivilege	2424	wmic.exe
Token: SeProfSingleProcessPrivilege	2424	wmic.exe
Token: SeIncBasePriorityPrivilege	2424	wmic.exe
Token: SeCreatePagefilePrivilege	2424	wmic.exe
Token: SeBackupPrivilege	2424	wmic.exe
Token: SeRestorePrivilege	2424	wmic.exe
Token: SeShutdownPrivilege	2424	wmic.exe
Token: SeDebugPrivilege	2424	wmic.exe
Token: SeSystemEnvironmentPrivilege	2424	wmic.exe
Token: SeRemoteShutdownPrivilege	2424	wmic.exe
Token: SeUndockPrivilege	2424	wmic.exe
Token: SeManageVolumePrivilege	2424	wmic.exe
Token: 33	2424	wmic.exe
Token: 34	2424	wmic.exe
Token: 35	2424	wmic.exe
Token: 36	2424	wmic.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1100 wrote to memory of 5076	1100	Build.exe	82
PID 1100 wrote to memory of 5076	1100	Build.exe	82
PID 1100 wrote to memory of 5076	1100	Build.exe	82
PID 1100 wrote to memory of 2732	1100	Build.exe	86
PID 1100 wrote to memory of 2732	1100	Build.exe	86
PID 1100 wrote to memory of 2732	1100	Build.exe	86
PID 1100 wrote to memory of 2424	1100	Build.exe	88
PID 1100 wrote to memory of 2424	1100	Build.exe	88
PID 1100 wrote to memory of 2424	1100	Build.exe	88

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\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⤵
- UAC bypass
- Checks whether UAC is enabled
- Drops desktop.ini file(s)
- Enumerates connected drives
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1100
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:5076
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:2732
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:2424

C:\Users\Admin\AppData\Roaming\svhost.exe
C:\Users\Admin\AppData\Roaming\svhost.exe
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:2376

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

Modify Registry

T1112

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
669KB

MD5
b446b1c86f3d27bb39783f9d3a112a40

SHA1
d9f66f8db27686f4f3b2c7d17557c84077ac801f

SHA256
1f5eefc1feb47e11e53f82055ca0921fc1b1299dffa7972c6faeff1904fdad1d

SHA512
c2b7682c265060c1c62be0b4dceba7fed6882b9fdc9cbbd1d379608a482bf215d81a2a3c03cc2df709bc936ee7d06ff1250dde92808bd0e0d1f1ee3410c35d9a

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

Filesize
536B

MD5
b8204074879e4705e9e82831a54e6409

SHA1
a2bc0a11b009be818d127c45165adcc81058c221

SHA256
9979bcd26933dd4f781c262b36f6d3df7f68f917258998913d38a660201699cf

SHA512
15ee09261ef9cfbb6f60312f0293650c68758a609bad3368ecf3e30ed72ec534e1987863b055afa42098a736f081b5c3a208eacf5f5ccfc3a8835eab39ece8f4

Download Submit
\Device\HarddiskVolume1\HOW_TO_RECOVER_DATA.html

Filesize
5KB

MD5
24d54a24267f08afdb6e68c85a7b8b2d

SHA1
7054b8203e821a1256271a6ce2c1705cf83ca28c

SHA256
4b98b8978026346524a5c96ea0d7e85da2aa861243a0664860bf0afbe8e671f4

SHA512
f31415827d9ca4f066f3cf51aff6ea1b3a1d43b0fc0d5fc26260f5d50f9d22d78cd47efb109887bbfb8e33db586295b58b8e8fff4590c1687db43398d5235fc1

Download Submit