medusalocker | aa4cd5e9ff8ef8e4a72601c03154231631a5179167400a5478ca4282188b1163

General

Target

64ME_bul9.exe
Size

666KB
MD5

5b780f32105ff92593db7b30ea2ac9ed
SHA1

6054922a051ce8d25d5d39565a9ad23575b7fe7f
SHA256

aa4cd5e9ff8ef8e4a72601c03154231631a5179167400a5478ca4282188b1163
SHA512

c93d9eee0cd547d513d3920f6fa5d3e22adaf6e4e7285f196ba4001d512f9ac05452e0243c526c713a880981249dbbad31947b08edf22f5eb53c6c77fb69d13d
SSDEEP

12288:ZYW1LNT35lDbK/LIVaN8+T7vwqyqhYMhWt918vulAWC9+m:dd35lDbKDIwWUDyqS5omDC9+

Score

10^/10

medusalocker evasion ransomware trojan

Malware Config

Extracted

Path

C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\!-Recovery_Instructions-!.html

Ransom Note

<!DOCTYPE html> <html lang="en"> <head> <meta charset='utf-8'> <meta name='viewport' content='width=device-width,initial-scale=1'> <title></title> <style> html, body { background-color: #1a1a1a; } body { padding-top: 1rem !important; font-size: 1.3rem; color: white; } #text h2 { font-size: 2rem; font-weight: 600; line-height: 1.125; } .container { max-width: 1152px; flex-grow: 1; margin: 0 auto; position: relative; width: auto; } .box { background-color: #242424; display: block; padding: 1.25rem; border: 1px solid #303030; } a { color: #00b4d8; text-decoration: none; } a:hover { text-decoration: underline; } li { margin-bottom: 10px; } </style> </head> <body> <div class='container'> <div class='box'> <div id='text'> <h2>If you get this message, your network was hacked!</h2> <p>After we gained full access to your servers, we first downloaded a large amount of sensitive data and then encrypted all the data stored on them.</p> <p>That includes personal information on your clients, partners, your personnel, accounting documents, and other crucial files that are necessary for your company to work normally.</p> <p>We used modern complicated algorithms, so you or any recovery service will not be able to decrypt files without our help, wasting time on these attempts instead of negotiations can be fatal for your company.</p> <p>Make sure to act within <span style='color:#f4a261;'>72</span> hours or the negotiations will be considered failed!</p> <p>Inform your superior management about what's going on.</p> <p> Contact us for price and get decryption software.</p> <p> Contact us by email:<p> <h2>[email protected]</h2> </p>If you will get no answer within 24 hours contact us by our alternate emails:</p> <h2>[email protected]</h2> </p>To verify the possibility of the recovery of your files we can decrypted 1-3 file for free.</p> </p>Attach file to the letter (no more than 5Mb).</p> <h2>If you and us succeed the negotiations we will grant you:</h2> <ul> <li>complete confidentiality, we will keep in secret any information regarding to attack, your company will act as if nothing had happened.</li> <li>comprehensive information about vulnerabilities of your network and security report.</li> <li>software and instructions to decrypt all the data that was encrypted.</li> <li>all sensitive downloaded data will be permanently deleted from our cloud storage and we will provide an erasure log.</li> </ul> <h2>Our options if you act like nothing's happening, refuse to make a deal or fail the negotiations:</h2> <ul> <li>inform the media and independent journalists about what happened to your servers. To prove it we'll publish a chunk of private data that you should have ciphered if you care about potential breaches. Moreover, your company will inevitably take decent reputational loss which is hard to assess precisely.</li> <li>inform your clients, employees, partners by phone, e-mail, sms and social networks that you haven't prevent their data leakage. You will violate laws about private data protection.</li> <li>start DDOS attack on you website and infrastructures.</li> <li>personal data stored will be put on sale on the Darknet to find anyone interested to buy useful information regarding your company. It could be data mining agencies or your market competitors.</li> <li>publish all the discovered vulnerabilities found in your network, so anyone will do anything with it.</li> </ul> <h2>Why pay us?</h2> <p>We care about our reputation. You are welcome to google our cases up and be sure that we don't have a single case of failure to provide what we promissed.</p> <p>Turning this issue to a bug bounty will save your private information, reputation and will allow you to use the security report and avoid this kind of situations in future.</p> <h2>Your personal ID</p> 3BAA04E7DB4EE914AA7653CFC2CFBDDB76B5CB3C6AF9C71AB528039F97B3238D1D07A4ABAB813F16BE18E01C69F9939173D51133F04B618BEA06DF1FC6771AB9<br>3ABBFE253C993E72873A46549947639C67F960481AD4419D6D8B6368D1B034C03FC0BD30C80B6F170A5E154A7BF246E0713753187AD836E97E2214A4B22E<br>0950AB7A6BB1B4646267809356519982ECA121C8FA81A7B9F3E03CD21AB410AB36C546044CF34C8EC5B3425C1B38774C46BDE3B7F05E807B319BBA62D7DF<br>7E335B35E6843B3696C4B5078C4CC2AAAFF97238D669E32D475686FDD08ED243D0E9A14266E91F55E1F4CD38737F579EC6D21640BD2448220E46EF2FC7AF<br>3CB06626BA66BCF9F59D891140C2F57DA5B40E262951DE782A9723D54AFF816B8063A0F0E92D3C5BE8760795D57EF3B28D1971332D79D0AEFDAE96807E25<br>E52BEFA580AC966DCBCCB37A0215E216260641939892E1FAD187CFA1FD6E9F879F9CCAD5E3C86E57EA9C4F7F16ACE50DFD76711FEC138B40DEF0193A4FCF<br>2DCC2A2407242834C5EE81A90CD153AFE8B6EA712109F3A8D1D77C5205EB8370893BE661138184197C98EEACB0DF90275397322969C661667AE152CA2855<br>7DF6138358B4006998D4C591FBE06A2F5BE271209361AB626F0B7C58F2F4FF72481F2951391E441BE2EEBB707B81A5DCC1221F093BB01E02AF83FE129181<br>1230151CCD05BD852B7E359812A7

Emails

<h2>[email protected]</h2>

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 2 IoCs

evasion trojan

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

64ME_bul9.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	64ME_bul9.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	64ME_bul9.exe

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

1624 svhost.exe
Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

64ME_bul9.exe

description ioc process

Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul9.exe
Drops desktop.ini file(s) 1 IoCs

Processes:

64ME_bul9.exe

description ioc process

File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-3385717845-2518323428-350143044-1000\desktop.ini 64ME_bul9.exe

pid	process
1624	svhost.exe

description	ioc	process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-3385717845-2518323428-350143044-1000\desktop.ini	64ME_bul9.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:

64ME_bul9.exe

description	ioc	process
File opened (read-only)	\??\L:	64ME_bul9.exe
File opened (read-only)	\??\O:	64ME_bul9.exe
File opened (read-only)	\??\P:	64ME_bul9.exe
File opened (read-only)	\??\S:	64ME_bul9.exe
File opened (read-only)	\??\H:	64ME_bul9.exe
File opened (read-only)	\??\J:	64ME_bul9.exe
File opened (read-only)	\??\I:	64ME_bul9.exe
File opened (read-only)	\??\N:	64ME_bul9.exe
File opened (read-only)	\??\Q:	64ME_bul9.exe
File opened (read-only)	\??\X:	64ME_bul9.exe
File opened (read-only)	\??\F:	64ME_bul9.exe
File opened (read-only)	\??\G:	64ME_bul9.exe
File opened (read-only)	\??\W:	64ME_bul9.exe
File opened (read-only)	\??\Y:	64ME_bul9.exe
File opened (read-only)	\??\R:	64ME_bul9.exe
File opened (read-only)	\??\U:	64ME_bul9.exe
File opened (read-only)	\??\E:	64ME_bul9.exe
File opened (read-only)	\??\K:	64ME_bul9.exe
File opened (read-only)	\??\M:	64ME_bul9.exe
File opened (read-only)	\??\T:	64ME_bul9.exe
File opened (read-only)	\??\V:	64ME_bul9.exe
File opened (read-only)	\??\Z:	64ME_bul9.exe
File opened (read-only)	\??\A:	64ME_bul9.exe
File opened (read-only)	\??\B:	64ME_bul9.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

472 vssadmin.exe
756 vssadmin.exe
1972 vssadmin.exe

pid	process
472	vssadmin.exe
756	vssadmin.exe
1972	vssadmin.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

64ME_bul9.exe

pid	process
2016	64ME_bul9.exe
2016	64ME_bul9.exe
2016	64ME_bul9.exe
2016	64ME_bul9.exe
2016	64ME_bul9.exe
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2016	64ME_bul9.exe
2016	64ME_bul9.exe
2016	64ME_bul9.exe

Suspicious use of AdjustPrivilegeToken 63 IoCs

Processes:

vssvc.exewmic.exewmic.exewmic.exe

description	pid	process
Token: SeBackupPrivilege	1172	vssvc.exe
Token: SeRestorePrivilege	1172	vssvc.exe
Token: SeAuditPrivilege	1172	vssvc.exe
Token: SeIncreaseQuotaPrivilege	1684	wmic.exe
Token: SeSecurityPrivilege	1684	wmic.exe
Token: SeTakeOwnershipPrivilege	1684	wmic.exe
Token: SeLoadDriverPrivilege	1684	wmic.exe
Token: SeSystemProfilePrivilege	1684	wmic.exe
Token: SeSystemtimePrivilege	1684	wmic.exe
Token: SeProfSingleProcessPrivilege	1684	wmic.exe
Token: SeIncBasePriorityPrivilege	1684	wmic.exe
Token: SeCreatePagefilePrivilege	1684	wmic.exe
Token: SeBackupPrivilege	1684	wmic.exe
Token: SeRestorePrivilege	1684	wmic.exe
Token: SeShutdownPrivilege	1684	wmic.exe
Token: SeDebugPrivilege	1684	wmic.exe
Token: SeSystemEnvironmentPrivilege	1684	wmic.exe
Token: SeRemoteShutdownPrivilege	1684	wmic.exe
Token: SeUndockPrivilege	1684	wmic.exe
Token: SeManageVolumePrivilege	1684	wmic.exe
Token: 33	1684	wmic.exe
Token: 34	1684	wmic.exe
Token: 35	1684	wmic.exe
Token: SeIncreaseQuotaPrivilege	836	wmic.exe
Token: SeSecurityPrivilege	836	wmic.exe
Token: SeTakeOwnershipPrivilege	836	wmic.exe
Token: SeLoadDriverPrivilege	836	wmic.exe
Token: SeSystemProfilePrivilege	836	wmic.exe
Token: SeSystemtimePrivilege	836	wmic.exe
Token: SeProfSingleProcessPrivilege	836	wmic.exe
Token: SeIncBasePriorityPrivilege	836	wmic.exe
Token: SeCreatePagefilePrivilege	836	wmic.exe
Token: SeBackupPrivilege	836	wmic.exe
Token: SeRestorePrivilege	836	wmic.exe
Token: SeShutdownPrivilege	836	wmic.exe
Token: SeDebugPrivilege	836	wmic.exe
Token: SeSystemEnvironmentPrivilege	836	wmic.exe
Token: SeRemoteShutdownPrivilege	836	wmic.exe
Token: SeUndockPrivilege	836	wmic.exe
Token: SeManageVolumePrivilege	836	wmic.exe
Token: 33	836	wmic.exe
Token: 34	836	wmic.exe
Token: 35	836	wmic.exe
Token: SeIncreaseQuotaPrivilege	1872	wmic.exe
Token: SeSecurityPrivilege	1872	wmic.exe
Token: SeTakeOwnershipPrivilege	1872	wmic.exe
Token: SeLoadDriverPrivilege	1872	wmic.exe
Token: SeSystemProfilePrivilege	1872	wmic.exe
Token: SeSystemtimePrivilege	1872	wmic.exe
Token: SeProfSingleProcessPrivilege	1872	wmic.exe
Token: SeIncBasePriorityPrivilege	1872	wmic.exe
Token: SeCreatePagefilePrivilege	1872	wmic.exe
Token: SeBackupPrivilege	1872	wmic.exe
Token: SeRestorePrivilege	1872	wmic.exe
Token: SeShutdownPrivilege	1872	wmic.exe
Token: SeDebugPrivilege	1872	wmic.exe
Token: SeSystemEnvironmentPrivilege	1872	wmic.exe
Token: SeRemoteShutdownPrivilege	1872	wmic.exe
Token: SeUndockPrivilege	1872	wmic.exe
Token: SeManageVolumePrivilege	1872	wmic.exe
Token: 33	1872	wmic.exe
Token: 34	1872	wmic.exe
Token: 35	1872	wmic.exe

Suspicious use of WriteProcessMemory 28 IoCs

Processes:

64ME_bul9.exetaskeng.exe

description	pid	process	target process
PID 2016 wrote to memory of 472	2016	64ME_bul9.exe	vssadmin.exe
PID 2016 wrote to memory of 472	2016	64ME_bul9.exe	vssadmin.exe
PID 2016 wrote to memory of 472	2016	64ME_bul9.exe	vssadmin.exe
PID 2016 wrote to memory of 472	2016	64ME_bul9.exe	vssadmin.exe
PID 2016 wrote to memory of 1684	2016	64ME_bul9.exe	wmic.exe
PID 2016 wrote to memory of 1684	2016	64ME_bul9.exe	wmic.exe
PID 2016 wrote to memory of 1684	2016	64ME_bul9.exe	wmic.exe
PID 2016 wrote to memory of 1684	2016	64ME_bul9.exe	wmic.exe
PID 2016 wrote to memory of 756	2016	64ME_bul9.exe	vssadmin.exe
PID 2016 wrote to memory of 756	2016	64ME_bul9.exe	vssadmin.exe
PID 2016 wrote to memory of 756	2016	64ME_bul9.exe	vssadmin.exe
PID 2016 wrote to memory of 756	2016	64ME_bul9.exe	vssadmin.exe
PID 2016 wrote to memory of 836	2016	64ME_bul9.exe	wmic.exe
PID 2016 wrote to memory of 836	2016	64ME_bul9.exe	wmic.exe
PID 2016 wrote to memory of 836	2016	64ME_bul9.exe	wmic.exe
PID 2016 wrote to memory of 836	2016	64ME_bul9.exe	wmic.exe
PID 2016 wrote to memory of 1972	2016	64ME_bul9.exe	vssadmin.exe
PID 2016 wrote to memory of 1972	2016	64ME_bul9.exe	vssadmin.exe
PID 2016 wrote to memory of 1972	2016	64ME_bul9.exe	vssadmin.exe
PID 2016 wrote to memory of 1972	2016	64ME_bul9.exe	vssadmin.exe
PID 2016 wrote to memory of 1872	2016	64ME_bul9.exe	wmic.exe
PID 2016 wrote to memory of 1872	2016	64ME_bul9.exe	wmic.exe
PID 2016 wrote to memory of 1872	2016	64ME_bul9.exe	wmic.exe
PID 2016 wrote to memory of 1872	2016	64ME_bul9.exe	wmic.exe
PID 108 wrote to memory of 1624	108	taskeng.exe	svhost.exe
PID 108 wrote to memory of 1624	108	taskeng.exe	svhost.exe
PID 108 wrote to memory of 1624	108	taskeng.exe	svhost.exe
PID 108 wrote to memory of 1624	108	taskeng.exe	svhost.exe

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

Processes:

64ME_bul9.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	64ME_bul9.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	64ME_bul9.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1"	64ME_bul9.exe

C:\Users\Admin\AppData\Local\Temp\64ME_bul9.exe
"C:\Users\Admin\AppData\Local\Temp\64ME_bul9.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:2016
- C:\Windows\SysWOW64\vssadmin.exe
  vssadmin.exe Delete Shadows /All /Quiet
  2⤵
  - Interacts with shadow copies
  PID:472
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1684
- C:\Windows\SysWOW64\vssadmin.exe
  vssadmin.exe Delete Shadows /All /Quiet
  2⤵
  - Interacts with shadow copies
  PID:756
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:836
- C:\Windows\SysWOW64\vssadmin.exe
  vssadmin.exe Delete Shadows /All /Quiet
  2⤵
  - Interacts with shadow copies
  PID:1972
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1872

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1172

C:\Windows\system32\taskeng.exe
taskeng.exe {0B5E0842-4C72-452D-8535-725720A462F7} S-1-5-21-3385717845-2518323428-350143044-1000:SABDUHNY\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:108
- C:\Users\Admin\AppData\Roaming\svhost.exe
  C:\Users\Admin\AppData\Roaming\svhost.exe
  2⤵
  - Executes dropped EXE
  PID:1624

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Bypass User Account Control

1

T1088

Defense Evasion

Bypass User Account Control

1

T1088

Disabling Security Tools

File Deletion

Modify Registry

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Inhibit System Recovery

2

T1490

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Downloads

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

Filesize
666KB

MD5
5b780f32105ff92593db7b30ea2ac9ed

SHA1
6054922a051ce8d25d5d39565a9ad23575b7fe7f

SHA256
aa4cd5e9ff8ef8e4a72601c03154231631a5179167400a5478ca4282188b1163

SHA512
c93d9eee0cd547d513d3920f6fa5d3e22adaf6e4e7285f196ba4001d512f9ac05452e0243c526c713a880981249dbbad31947b08edf22f5eb53c6c77fb69d13d

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

Filesize
666KB

MD5
5b780f32105ff92593db7b30ea2ac9ed

SHA1
6054922a051ce8d25d5d39565a9ad23575b7fe7f

SHA256
aa4cd5e9ff8ef8e4a72601c03154231631a5179167400a5478ca4282188b1163

SHA512
c93d9eee0cd547d513d3920f6fa5d3e22adaf6e4e7285f196ba4001d512f9ac05452e0243c526c713a880981249dbbad31947b08edf22f5eb53c6c77fb69d13d

Download Submit
memory/472-55-0x0000000000000000-mapping.dmp

Download
memory/756-57-0x0000000000000000-mapping.dmp

Download
memory/836-58-0x0000000000000000-mapping.dmp

Download
memory/1624-62-0x0000000000000000-mapping.dmp

Download
memory/1684-56-0x0000000000000000-mapping.dmp

Download
memory/1872-60-0x0000000000000000-mapping.dmp

Download
memory/1972-59-0x0000000000000000-mapping.dmp

Download
memory/2016-54-0x0000000075891000-0x0000000075893000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads