Resubmissions
30-11-2023 10:51
231130-mx5qxsah79 1029-06-2023 20:59
230629-zs72psfa95 1029-06-2023 16:29
230629-tzp7ksec27 10Analysis
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max time kernel
141s -
max time network
136s -
platform
windows10-2004_x64 -
resource
win10v2004-20230621-en -
resource tags
arch:x64arch:x86image:win10v2004-20230621-enlocale:en-usos:windows10-2004-x64system -
submitted
29-06-2023 16:29
Behavioral task
behavioral1
Sample
medusa.exe
Resource
win7-20230621-en
Behavioral task
behavioral2
Sample
medusa.exe
Resource
win10v2004-20230621-en
General
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Target
medusa.exe
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Size
235KB
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MD5
f6f120d1262b88f79debb5d848ac7db9
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SHA1
1339282f9b2d2a41326daf3cf284ec2ae8f0f93c
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SHA256
1bc0575b3fc6486cb2510dac1ac6ae4889b94a955d3eade53d3ba3a92d133281
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SHA512
1067c1a73cf891d651fa007f4ccc4452f32801fe3859933ef1bcc00985e35ce016fa6c601c0e3c10df2080fc9b8a776b2f18d40bd64dfb98177ab638c4b545bd
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SSDEEP
6144:c5vMUmRTTgwnfeP+Jx1cLNAIyBcc9WrEWUC4wQh/6BeX:/U8Tgufnx1cLNncgQWUUQh/+e
Malware Config
Extracted
\Device\HarddiskVolume1\Boot\HOW_TO_RECOVER_DATA.html
Signatures
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MedusaLocker
Ransomware with several variants first seen in September 2019.
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MedusaLocker payload 15 IoCs
Processes:
resource yara_rule behavioral2/memory/1440-134-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/1440-246-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/1440-247-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/1440-791-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/1440-792-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/1440-793-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/1440-794-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/4068-806-0x0000000001000000-0x00000000010B2000-memory.dmp family_medusalocker behavioral2/memory/1440-808-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/1440-809-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/1440-810-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/1440-811-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/1440-812-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/1440-813-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker behavioral2/memory/1440-814-0x0000000000D70000-0x0000000000E22000-memory.dmp family_medusalocker -
Processes:
medusa.exedescription 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 (210) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Modifies extensions of user files 8 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
medusa.exedescription ioc process File renamed C:\Users\Admin\Pictures\DisconnectUnprotect.raw => C:\Users\Admin\Pictures\DisconnectUnprotect.raw.marlock07 medusa.exe File renamed C:\Users\Admin\Pictures\EditUnregister.crw => C:\Users\Admin\Pictures\EditUnregister.crw.marlock07 medusa.exe File renamed C:\Users\Admin\Pictures\GrantCheckpoint.png => C:\Users\Admin\Pictures\GrantCheckpoint.png.marlock07 medusa.exe File opened for modification C:\Users\Admin\Pictures\MountCompare.tiff medusa.exe File renamed C:\Users\Admin\Pictures\MountCompare.tiff => C:\Users\Admin\Pictures\MountCompare.tiff.marlock07 medusa.exe File renamed C:\Users\Admin\Pictures\PingSelect.tif => C:\Users\Admin\Pictures\PingSelect.tif.marlock07 medusa.exe File renamed C:\Users\Admin\Pictures\PublishGrant.png => C:\Users\Admin\Pictures\PublishGrant.png.marlock07 medusa.exe File renamed C:\Users\Admin\Pictures\SetRestore.raw => C:\Users\Admin\Pictures\SetRestore.raw.marlock07 medusa.exe -
Executes dropped EXE 1 IoCs
Processes:
svhost.exepid process 4068 svhost.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Processes:
resource yara_rule behavioral2/memory/1440-134-0x0000000000D70000-0x0000000000E22000-memory.dmp upx behavioral2/memory/1440-246-0x0000000000D70000-0x0000000000E22000-memory.dmp upx behavioral2/memory/1440-247-0x0000000000D70000-0x0000000000E22000-memory.dmp upx behavioral2/memory/1440-791-0x0000000000D70000-0x0000000000E22000-memory.dmp upx behavioral2/memory/1440-792-0x0000000000D70000-0x0000000000E22000-memory.dmp upx behavioral2/memory/1440-793-0x0000000000D70000-0x0000000000E22000-memory.dmp upx behavioral2/memory/1440-794-0x0000000000D70000-0x0000000000E22000-memory.dmp upx C:\Users\Admin\AppData\Roaming\svhost.exe upx C:\Users\Admin\AppData\Roaming\svhost.exe upx behavioral2/memory/4068-806-0x0000000001000000-0x00000000010B2000-memory.dmp upx behavioral2/memory/1440-808-0x0000000000D70000-0x0000000000E22000-memory.dmp upx behavioral2/memory/1440-809-0x0000000000D70000-0x0000000000E22000-memory.dmp upx behavioral2/memory/1440-810-0x0000000000D70000-0x0000000000E22000-memory.dmp upx behavioral2/memory/1440-811-0x0000000000D70000-0x0000000000E22000-memory.dmp upx behavioral2/memory/1440-812-0x0000000000D70000-0x0000000000E22000-memory.dmp upx behavioral2/memory/1440-813-0x0000000000D70000-0x0000000000E22000-memory.dmp upx behavioral2/memory/1440-814-0x0000000000D70000-0x0000000000E22000-memory.dmp upx -
Processes:
medusa.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" medusa.exe -
Drops desktop.ini file(s) 1 IoCs
Processes:
medusa.exedescription ioc process File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-3259792829-1422303781-2047321929-1000\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.
Processes:
medusa.exedescription ioc process File opened (read-only) \??\L: medusa.exe File opened (read-only) \??\O: medusa.exe File opened (read-only) \??\S: medusa.exe File opened (read-only) \??\T: 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) \??\I: medusa.exe File opened (read-only) \??\N: medusa.exe File opened (read-only) \??\Q: medusa.exe File opened (read-only) \??\V: medusa.exe File opened (read-only) \??\E: medusa.exe File opened (read-only) \??\G: medusa.exe File opened (read-only) \??\J: medusa.exe File opened (read-only) \??\P: medusa.exe File opened (read-only) \??\Y: medusa.exe File opened (read-only) \??\W: medusa.exe File opened (read-only) \??\F: medusa.exe File opened (read-only) \??\B: medusa.exe File opened (read-only) \??\H: medusa.exe File opened (read-only) \??\K: medusa.exe File opened (read-only) \??\M: medusa.exe File opened (read-only) \??\R: medusa.exe File opened (read-only) \??\U: medusa.exe -
Drops file in System32 directory 8 IoCs
Processes:
svchost.exedescription ioc process File created C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{9B3955B5-2CB9-44E0-99F7-4175C23EA650}.catalogItem svchost.exe File created C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{4D11F645-B0B3-49EB-8F33-53880814FEF8}.catalogItem svchost.exe File created C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{C347A40B-79D3-48BF-9A9C-E3B2BFC42D8D}.catalogItem svchost.exe File created C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{1E87279B-096C-435D-A6FE-C4069B4282B8}.catalogItem svchost.exe File created C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{F8F910CA-70AE-4C07-B1AA-5C18B51B8EF7}.catalogItem svchost.exe File created C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{A85515B1-E481-43BA-9080-751D85F9FA91}.catalogItem svchost.exe File created C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{C64C9BFE-FE88-4256-8A26-A85D4A79F097}.catalogItem svchost.exe File created C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{D0A298BE-C7EE-48BA-B318-A19E1DA10C04}.catalogItem svchost.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Suspicious behavior: EnumeratesProcesses 64 IoCs
Processes:
medusa.exepid process 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe 1440 medusa.exe -
Suspicious use of AdjustPrivilegeToken 63 IoCs
Processes:
wmic.exewmic.exewmic.exedescription pid process Token: SeIncreaseQuotaPrivilege 348 wmic.exe Token: SeSecurityPrivilege 348 wmic.exe Token: SeTakeOwnershipPrivilege 348 wmic.exe Token: SeLoadDriverPrivilege 348 wmic.exe Token: SeSystemProfilePrivilege 348 wmic.exe Token: SeSystemtimePrivilege 348 wmic.exe Token: SeProfSingleProcessPrivilege 348 wmic.exe Token: SeIncBasePriorityPrivilege 348 wmic.exe Token: SeCreatePagefilePrivilege 348 wmic.exe Token: SeBackupPrivilege 348 wmic.exe Token: SeRestorePrivilege 348 wmic.exe Token: SeShutdownPrivilege 348 wmic.exe Token: SeDebugPrivilege 348 wmic.exe Token: SeSystemEnvironmentPrivilege 348 wmic.exe Token: SeRemoteShutdownPrivilege 348 wmic.exe Token: SeUndockPrivilege 348 wmic.exe Token: SeManageVolumePrivilege 348 wmic.exe Token: 33 348 wmic.exe Token: 34 348 wmic.exe Token: 35 348 wmic.exe Token: 36 348 wmic.exe Token: SeIncreaseQuotaPrivilege 832 wmic.exe Token: SeSecurityPrivilege 832 wmic.exe Token: SeTakeOwnershipPrivilege 832 wmic.exe Token: SeLoadDriverPrivilege 832 wmic.exe Token: SeSystemProfilePrivilege 832 wmic.exe Token: SeSystemtimePrivilege 832 wmic.exe Token: SeProfSingleProcessPrivilege 832 wmic.exe Token: SeIncBasePriorityPrivilege 832 wmic.exe Token: SeCreatePagefilePrivilege 832 wmic.exe Token: SeBackupPrivilege 832 wmic.exe Token: SeRestorePrivilege 832 wmic.exe Token: SeShutdownPrivilege 832 wmic.exe Token: SeDebugPrivilege 832 wmic.exe Token: SeSystemEnvironmentPrivilege 832 wmic.exe Token: SeRemoteShutdownPrivilege 832 wmic.exe Token: SeUndockPrivilege 832 wmic.exe Token: SeManageVolumePrivilege 832 wmic.exe Token: 33 832 wmic.exe Token: 34 832 wmic.exe Token: 35 832 wmic.exe Token: 36 832 wmic.exe Token: SeIncreaseQuotaPrivilege 4436 wmic.exe Token: SeSecurityPrivilege 4436 wmic.exe Token: SeTakeOwnershipPrivilege 4436 wmic.exe Token: SeLoadDriverPrivilege 4436 wmic.exe Token: SeSystemProfilePrivilege 4436 wmic.exe Token: SeSystemtimePrivilege 4436 wmic.exe Token: SeProfSingleProcessPrivilege 4436 wmic.exe Token: SeIncBasePriorityPrivilege 4436 wmic.exe Token: SeCreatePagefilePrivilege 4436 wmic.exe Token: SeBackupPrivilege 4436 wmic.exe Token: SeRestorePrivilege 4436 wmic.exe Token: SeShutdownPrivilege 4436 wmic.exe Token: SeDebugPrivilege 4436 wmic.exe Token: SeSystemEnvironmentPrivilege 4436 wmic.exe Token: SeRemoteShutdownPrivilege 4436 wmic.exe Token: SeUndockPrivilege 4436 wmic.exe Token: SeManageVolumePrivilege 4436 wmic.exe Token: 33 4436 wmic.exe Token: 34 4436 wmic.exe Token: 35 4436 wmic.exe Token: 36 4436 wmic.exe -
Suspicious use of WriteProcessMemory 9 IoCs
Processes:
medusa.exedescription pid process target process PID 1440 wrote to memory of 348 1440 medusa.exe wmic.exe PID 1440 wrote to memory of 348 1440 medusa.exe wmic.exe PID 1440 wrote to memory of 348 1440 medusa.exe wmic.exe PID 1440 wrote to memory of 832 1440 medusa.exe wmic.exe PID 1440 wrote to memory of 832 1440 medusa.exe wmic.exe PID 1440 wrote to memory of 832 1440 medusa.exe wmic.exe PID 1440 wrote to memory of 4436 1440 medusa.exe wmic.exe PID 1440 wrote to memory of 4436 1440 medusa.exe wmic.exe PID 1440 wrote to memory of 4436 1440 medusa.exe wmic.exe -
System policy modification 1 TTPs 3 IoCs
Processes:
medusa.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1" medusa.exe 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
Processes
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C:\Users\Admin\AppData\Local\Temp\medusa.exe"C:\Users\Admin\AppData\Local\Temp\medusa.exe"1⤵
- UAC bypass
- 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:1440 -
C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:348
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:832
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:4436
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k netsvcs -p1⤵
- Drops file in System32 directory
PID:4972
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C:\Users\Admin\AppData\Roaming\svhost.exeC:\Users\Admin\AppData\Roaming\svhost.exe1⤵
- Executes dropped EXE
PID:4068
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
235KB
MD5f6f120d1262b88f79debb5d848ac7db9
SHA11339282f9b2d2a41326daf3cf284ec2ae8f0f93c
SHA2561bc0575b3fc6486cb2510dac1ac6ae4889b94a955d3eade53d3ba3a92d133281
SHA5121067c1a73cf891d651fa007f4ccc4452f32801fe3859933ef1bcc00985e35ce016fa6c601c0e3c10df2080fc9b8a776b2f18d40bd64dfb98177ab638c4b545bd
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Filesize
235KB
MD5f6f120d1262b88f79debb5d848ac7db9
SHA11339282f9b2d2a41326daf3cf284ec2ae8f0f93c
SHA2561bc0575b3fc6486cb2510dac1ac6ae4889b94a955d3eade53d3ba3a92d133281
SHA5121067c1a73cf891d651fa007f4ccc4452f32801fe3859933ef1bcc00985e35ce016fa6c601c0e3c10df2080fc9b8a776b2f18d40bd64dfb98177ab638c4b545bd
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Filesize
536B
MD58ed60a818163f21a666f6f182ec6bac3
SHA1c299c3b9c74286fde689e5d2f0f1d58fb0437165
SHA256ee387049b6f1f3f81b2cdffe7736fff9d029d5c51c76fb780ed0c1d0684bf3ef
SHA5123ca30623977e214170522fc0d33c961cf13e9718d77f69dbee3681b43cf293227b9df57d0098e4821973d2e7c83e1296a629e1aad984b9e5669c4480de75616f
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Filesize
4KB
MD5a1808aba85d47f4d624181391d0ded9b
SHA126e00e07541b814bdaac65cf7b7dbf1864de1f0c
SHA2565a288a2998ac7bd5c69a0844c4f8bca0cd8b230afd99a59f7bde8b56a29cc957
SHA512c440171ee630982d0e57f2415cf480392631bdc0dd9344243c5b22a649a0f81936c14c3dc09271e4d916c8fc9c7422423ac3155771773d8aafa732ba4e0930b1