medusalocker | 26af2222204fca27c0fdabf9eefbfdb638a8a9322b297119f85cce3c708090f0

Analysis

max time kernel
300s
max time network
96s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
13-11-2024 12:20

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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 discovery evasion ransomware spyware stealer trojan

Malware Config

Extracted

Path

\Device\HarddiskVolume1\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;">952E3DB17B4CFD428E18445EBFA89C46042A7E0F75F35800A94FC8708B6E47A92344FCA6C5956B3B7610B42761FF031B470FACE7FC0412BDAF5C0B99F56A6DE5<br>2D59CAA9BBCA3C2A42C708CFF692F596F6D60EC5388F14BE4AD8B559AC97524D6E871AE6C6C66B373825AA408FF239A512E77A3ADAC487E8A4BE5E4EAACE<br>A25325850B9495F7DE2191F821C25E740583740DFC0CBA169046BF1E70AC8B3FD05CD848B2328698D0C48D11A97FF1265CFE51C342373B77278485CB4C1C<br>A25D2E991B7C7AAF217E277E4F06726B377C29CAE92AE62EEE8D3212019F3241C73F8B93FA20C38D3F89FC483C49F68EB11577ABC45872DF78A2AE3342A9<br>5DE88C34469634F44DC6B728784D98B2CC5D7ABBC685B0F6C41CABBADE250C2E9143631EA59EE4076138980A00CCFA473D7721B0A981A47A3308F927B8F0<br>A98FA76803D7C25BE49DCBC9E121BF1FED6F5143C04A71C969EC13D066FC767FF068102DEE3859CE4E1FB05A10217D3F24B052D7F7A99F90CADE5A9DAF21<br>37C7273CEFE854B6389AF59DDB5EFF791B76FF242786CD37D2119CDA6D9F9D752E8FAFE828F0BB7996BCB08D95C316A8B1D1E988C703C3F34D3BC782A51B<br>980AF1DCC06F92AFCE07080A77F29BE87F9197BC690922185905066F03E55D8115E7A0ED6F6A6E750CA215B691B8047642A9F400F3A7B5435AAD69DC9C36<br>77A86A98B6543972D2B5BA37F922</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
behavioral2/files/0x000c000000023bc6-770.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"	medusa.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	medusa.exe

Renames multiple (249) 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
232	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"	medusa.exe

Drops desktop.ini file(s) 1 IoCs

description	ioc	Process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-940901362-3608833189-1915618603-1000\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)	\??\W:	medusa.exe
File opened (read-only)	\??\X:	medusa.exe
File opened (read-only)	\??\Z:	medusa.exe
File opened (read-only)	\??\A:	medusa.exe
File opened (read-only)	\??\N:	medusa.exe
File opened (read-only)	\??\R:	medusa.exe
File opened (read-only)	\??\V:	medusa.exe
File opened (read-only)	\??\F:	medusa.exe
File opened (read-only)	\??\B:	medusa.exe
File opened (read-only)	\??\J:	medusa.exe
File opened (read-only)	\??\Y:	medusa.exe
File opened (read-only)	\??\L:	medusa.exe
File opened (read-only)	\??\P:	medusa.exe
File opened (read-only)	\??\Q:	medusa.exe
File opened (read-only)	\??\E:	medusa.exe
File opened (read-only)	\??\G:	medusa.exe
File opened (read-only)	\??\H:	medusa.exe
File opened (read-only)	\??\I:	medusa.exe
File opened (read-only)	\??\K:	medusa.exe
File opened (read-only)	\??\S:	medusa.exe
File opened (read-only)	\??\T:	medusa.exe
File opened (read-only)	\??\U:	medusa.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	medusa.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
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe
2276	medusa.exe

Suspicious use of AdjustPrivilegeToken 63 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	1620	wmic.exe
Token: SeSecurityPrivilege	1620	wmic.exe
Token: SeTakeOwnershipPrivilege	1620	wmic.exe
Token: SeLoadDriverPrivilege	1620	wmic.exe
Token: SeSystemProfilePrivilege	1620	wmic.exe
Token: SeSystemtimePrivilege	1620	wmic.exe
Token: SeProfSingleProcessPrivilege	1620	wmic.exe
Token: SeIncBasePriorityPrivilege	1620	wmic.exe
Token: SeCreatePagefilePrivilege	1620	wmic.exe
Token: SeBackupPrivilege	1620	wmic.exe
Token: SeRestorePrivilege	1620	wmic.exe
Token: SeShutdownPrivilege	1620	wmic.exe
Token: SeDebugPrivilege	1620	wmic.exe
Token: SeSystemEnvironmentPrivilege	1620	wmic.exe
Token: SeRemoteShutdownPrivilege	1620	wmic.exe
Token: SeUndockPrivilege	1620	wmic.exe
Token: SeManageVolumePrivilege	1620	wmic.exe
Token: 33	1620	wmic.exe
Token: 34	1620	wmic.exe
Token: 35	1620	wmic.exe
Token: 36	1620	wmic.exe
Token: SeIncreaseQuotaPrivilege	2564	wmic.exe
Token: SeSecurityPrivilege	2564	wmic.exe
Token: SeTakeOwnershipPrivilege	2564	wmic.exe
Token: SeLoadDriverPrivilege	2564	wmic.exe
Token: SeSystemProfilePrivilege	2564	wmic.exe
Token: SeSystemtimePrivilege	2564	wmic.exe
Token: SeProfSingleProcessPrivilege	2564	wmic.exe
Token: SeIncBasePriorityPrivilege	2564	wmic.exe
Token: SeCreatePagefilePrivilege	2564	wmic.exe
Token: SeBackupPrivilege	2564	wmic.exe
Token: SeRestorePrivilege	2564	wmic.exe
Token: SeShutdownPrivilege	2564	wmic.exe
Token: SeDebugPrivilege	2564	wmic.exe
Token: SeSystemEnvironmentPrivilege	2564	wmic.exe
Token: SeRemoteShutdownPrivilege	2564	wmic.exe
Token: SeUndockPrivilege	2564	wmic.exe
Token: SeManageVolumePrivilege	2564	wmic.exe
Token: 33	2564	wmic.exe
Token: 34	2564	wmic.exe
Token: 35	2564	wmic.exe
Token: 36	2564	wmic.exe
Token: SeIncreaseQuotaPrivilege	8	wmic.exe
Token: SeSecurityPrivilege	8	wmic.exe
Token: SeTakeOwnershipPrivilege	8	wmic.exe
Token: SeLoadDriverPrivilege	8	wmic.exe
Token: SeSystemProfilePrivilege	8	wmic.exe
Token: SeSystemtimePrivilege	8	wmic.exe
Token: SeProfSingleProcessPrivilege	8	wmic.exe
Token: SeIncBasePriorityPrivilege	8	wmic.exe
Token: SeCreatePagefilePrivilege	8	wmic.exe
Token: SeBackupPrivilege	8	wmic.exe
Token: SeRestorePrivilege	8	wmic.exe
Token: SeShutdownPrivilege	8	wmic.exe
Token: SeDebugPrivilege	8	wmic.exe
Token: SeSystemEnvironmentPrivilege	8	wmic.exe
Token: SeRemoteShutdownPrivilege	8	wmic.exe
Token: SeUndockPrivilege	8	wmic.exe
Token: SeManageVolumePrivilege	8	wmic.exe
Token: 33	8	wmic.exe
Token: 34	8	wmic.exe
Token: 35	8	wmic.exe
Token: 36	8	wmic.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2276 wrote to memory of 1620	2276	medusa.exe	84
PID 2276 wrote to memory of 1620	2276	medusa.exe	84
PID 2276 wrote to memory of 1620	2276	medusa.exe	84
PID 2276 wrote to memory of 2564	2276	medusa.exe	88
PID 2276 wrote to memory of 2564	2276	medusa.exe	88
PID 2276 wrote to memory of 2564	2276	medusa.exe	88
PID 2276 wrote to memory of 8	2276	medusa.exe	90
PID 2276 wrote to memory of 8	2276	medusa.exe	90
PID 2276 wrote to memory of 8	2276	medusa.exe	90

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

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
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2276
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:1620
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:2564
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:8

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:232

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

Replay Monitor

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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
1146a6e490ce5cec3834cc9e544829b0

SHA1
0decab062fd239c9578f404e400379a7f594d2db

SHA256
715768d6e7276e110a4a315d964dc4e43b30b02957907d1eeb48df0a130599d5

SHA512
c55514ed1c44343317518dce0621bb57bc986dc40d5af4e3a3a5923c1702e9ec150c858a90e76846ca87d5a4cd7167f5a745806e6696569c9384daf895c9dc5a

Download Submit
\Device\HarddiskVolume1\how_to_back_files.html

Filesize
4KB

MD5
a4608c5af58c19e35f0efaa4a2524f37

SHA1
1e518bcef6d388a61962831f8c7ffdc3e04de0a5

SHA256
cb3dff8cf72cdc17ccf6f5c3d1f6d28c8639af1104aa69ff6dbffad0ecf07f46

SHA512
de15022555e8910e63c43d85814d1a6493a26d43ca2feaeb92aca40f0ccc36a2ef410db9327544fdf7a183d1068030c05e99ecc47d20a0ca9bb5fc37656cf965

Download Submit