Analysis
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max time kernel
151s -
max time network
46s -
platform
windows7_x64 -
resource
win7-20220812-en -
resource tags
arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system -
submitted
26-12-2022 19:27
Behavioral task
behavioral1
Sample
64ME_bul4.exe
Resource
win7-20220812-en
Behavioral task
behavioral2
Sample
64ME_bul4.exe
Resource
win10v2004-20220812-en
General
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Target
64ME_bul4.exe
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Size
666KB
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MD5
3adfa0251f25bf5766d96ae7e080c9bc
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SHA1
346882da16b892462929e08e084e7fccf89c2afb
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SHA256
9555810647200a6eda75dfe1527c1d8720e929b19a6086e536fb4fce4d9db485
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SHA512
9c7e05c42bab4455556c7dec89ef8df274010a3cefcf59641a0f23b984826c373df364c5b59188e932136be87ec9b30dba11bf2b6bd9ad9ba4880679fa052622
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SSDEEP
12288:ZYW1LNT35lDbK/LIVaN8+T7vwqyqhYMhWt918vulALC9+m:dd35lDbKDIwWUDyqS5om+C9+
Malware Config
Extracted
C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\!-Recovery_Instructions-!.html
Signatures
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MedusaLocker
Ransomware with several variants first seen in September 2019.
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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 -
Processes:
64ME_bul4.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul4.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" 64ME_bul4.exe -
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Executes dropped EXE 1 IoCs
Processes:
svhost.exepid process 292 svhost.exe -
Modifies extensions of user files 11 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
64ME_bul4.exedescription ioc process File renamed C:\Users\Admin\Pictures\AssertConvert.png => C:\Users\Admin\Pictures\AssertConvert.png.bulwark4 64ME_bul4.exe File renamed C:\Users\Admin\Pictures\NewSuspend.tiff => C:\Users\Admin\Pictures\NewSuspend.tiff.bulwark4 64ME_bul4.exe File renamed C:\Users\Admin\Pictures\RestoreClear.raw => C:\Users\Admin\Pictures\RestoreClear.raw.bulwark4 64ME_bul4.exe File renamed C:\Users\Admin\Pictures\TestWait.crw => C:\Users\Admin\Pictures\TestWait.crw.bulwark4 64ME_bul4.exe File renamed C:\Users\Admin\Pictures\UnregisterConnect.png => C:\Users\Admin\Pictures\UnregisterConnect.png.bulwark4 64ME_bul4.exe File opened for modification C:\Users\Admin\Pictures\ConfirmCompress.tiff 64ME_bul4.exe File renamed C:\Users\Admin\Pictures\ConfirmCompress.tiff => C:\Users\Admin\Pictures\ConfirmCompress.tiff.bulwark4 64ME_bul4.exe File renamed C:\Users\Admin\Pictures\ConvertFromDisconnect.png => C:\Users\Admin\Pictures\ConvertFromDisconnect.png.bulwark4 64ME_bul4.exe File renamed C:\Users\Admin\Pictures\NewBackup.tif => C:\Users\Admin\Pictures\NewBackup.tif.bulwark4 64ME_bul4.exe File opened for modification C:\Users\Admin\Pictures\NewSuspend.tiff 64ME_bul4.exe File renamed C:\Users\Admin\Pictures\RestoreFind.crw => C:\Users\Admin\Pictures\RestoreFind.crw.bulwark4 64ME_bul4.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:
64ME_bul4.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul4.exe -
Drops desktop.ini file(s) 1 IoCs
Processes:
64ME_bul4.exedescription ioc process File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-3845472200-3839195424-595303356-1000\desktop.ini 64ME_bul4.exe -
Enumerates connected drives 3 TTPs 24 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
Processes:
64ME_bul4.exedescription ioc process File opened (read-only) \??\N: 64ME_bul4.exe File opened (read-only) \??\P: 64ME_bul4.exe File opened (read-only) \??\Z: 64ME_bul4.exe File opened (read-only) \??\A: 64ME_bul4.exe File opened (read-only) \??\F: 64ME_bul4.exe File opened (read-only) \??\M: 64ME_bul4.exe File opened (read-only) \??\T: 64ME_bul4.exe File opened (read-only) \??\H: 64ME_bul4.exe File opened (read-only) \??\L: 64ME_bul4.exe File opened (read-only) \??\Q: 64ME_bul4.exe File opened (read-only) \??\W: 64ME_bul4.exe File opened (read-only) \??\Y: 64ME_bul4.exe File opened (read-only) \??\E: 64ME_bul4.exe File opened (read-only) \??\I: 64ME_bul4.exe File opened (read-only) \??\J: 64ME_bul4.exe File opened (read-only) \??\O: 64ME_bul4.exe File opened (read-only) \??\R: 64ME_bul4.exe File opened (read-only) \??\S: 64ME_bul4.exe File opened (read-only) \??\U: 64ME_bul4.exe File opened (read-only) \??\V: 64ME_bul4.exe File opened (read-only) \??\B: 64ME_bul4.exe File opened (read-only) \??\G: 64ME_bul4.exe File opened (read-only) \??\K: 64ME_bul4.exe File opened (read-only) \??\X: 64ME_bul4.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Interacts with shadow copies 2 TTPs 3 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
Processes:
vssadmin.exevssadmin.exevssadmin.exepid process 1876 vssadmin.exe 588 vssadmin.exe 1840 vssadmin.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
Processes:
64ME_bul4.exepid process 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe 828 64ME_bul4.exe -
Suspicious use of AdjustPrivilegeToken 63 IoCs
Processes:
vssvc.exewmic.exewmic.exewmic.exedescription pid process Token: SeBackupPrivilege 1568 vssvc.exe Token: SeRestorePrivilege 1568 vssvc.exe Token: SeAuditPrivilege 1568 vssvc.exe Token: SeIncreaseQuotaPrivilege 912 wmic.exe Token: SeSecurityPrivilege 912 wmic.exe Token: SeTakeOwnershipPrivilege 912 wmic.exe Token: SeLoadDriverPrivilege 912 wmic.exe Token: SeSystemProfilePrivilege 912 wmic.exe Token: SeSystemtimePrivilege 912 wmic.exe Token: SeProfSingleProcessPrivilege 912 wmic.exe Token: SeIncBasePriorityPrivilege 912 wmic.exe Token: SeCreatePagefilePrivilege 912 wmic.exe Token: SeBackupPrivilege 912 wmic.exe Token: SeRestorePrivilege 912 wmic.exe Token: SeShutdownPrivilege 912 wmic.exe Token: SeDebugPrivilege 912 wmic.exe Token: SeSystemEnvironmentPrivilege 912 wmic.exe Token: SeRemoteShutdownPrivilege 912 wmic.exe Token: SeUndockPrivilege 912 wmic.exe Token: SeManageVolumePrivilege 912 wmic.exe Token: 33 912 wmic.exe Token: 34 912 wmic.exe Token: 35 912 wmic.exe Token: SeIncreaseQuotaPrivilege 976 wmic.exe Token: SeSecurityPrivilege 976 wmic.exe Token: SeTakeOwnershipPrivilege 976 wmic.exe Token: SeLoadDriverPrivilege 976 wmic.exe Token: SeSystemProfilePrivilege 976 wmic.exe Token: SeSystemtimePrivilege 976 wmic.exe Token: SeProfSingleProcessPrivilege 976 wmic.exe Token: SeIncBasePriorityPrivilege 976 wmic.exe Token: SeCreatePagefilePrivilege 976 wmic.exe Token: SeBackupPrivilege 976 wmic.exe Token: SeRestorePrivilege 976 wmic.exe Token: SeShutdownPrivilege 976 wmic.exe Token: SeDebugPrivilege 976 wmic.exe Token: SeSystemEnvironmentPrivilege 976 wmic.exe Token: SeRemoteShutdownPrivilege 976 wmic.exe Token: SeUndockPrivilege 976 wmic.exe Token: SeManageVolumePrivilege 976 wmic.exe Token: 33 976 wmic.exe Token: 34 976 wmic.exe Token: 35 976 wmic.exe Token: SeIncreaseQuotaPrivilege 780 wmic.exe Token: SeSecurityPrivilege 780 wmic.exe Token: SeTakeOwnershipPrivilege 780 wmic.exe Token: SeLoadDriverPrivilege 780 wmic.exe Token: SeSystemProfilePrivilege 780 wmic.exe Token: SeSystemtimePrivilege 780 wmic.exe Token: SeProfSingleProcessPrivilege 780 wmic.exe Token: SeIncBasePriorityPrivilege 780 wmic.exe Token: SeCreatePagefilePrivilege 780 wmic.exe Token: SeBackupPrivilege 780 wmic.exe Token: SeRestorePrivilege 780 wmic.exe Token: SeShutdownPrivilege 780 wmic.exe Token: SeDebugPrivilege 780 wmic.exe Token: SeSystemEnvironmentPrivilege 780 wmic.exe Token: SeRemoteShutdownPrivilege 780 wmic.exe Token: SeUndockPrivilege 780 wmic.exe Token: SeManageVolumePrivilege 780 wmic.exe Token: 33 780 wmic.exe Token: 34 780 wmic.exe Token: 35 780 wmic.exe -
Suspicious use of WriteProcessMemory 28 IoCs
Processes:
64ME_bul4.exetaskeng.exedescription pid process target process PID 828 wrote to memory of 1876 828 64ME_bul4.exe vssadmin.exe PID 828 wrote to memory of 1876 828 64ME_bul4.exe vssadmin.exe PID 828 wrote to memory of 1876 828 64ME_bul4.exe vssadmin.exe PID 828 wrote to memory of 1876 828 64ME_bul4.exe vssadmin.exe PID 828 wrote to memory of 912 828 64ME_bul4.exe wmic.exe PID 828 wrote to memory of 912 828 64ME_bul4.exe wmic.exe PID 828 wrote to memory of 912 828 64ME_bul4.exe wmic.exe PID 828 wrote to memory of 912 828 64ME_bul4.exe wmic.exe PID 828 wrote to memory of 588 828 64ME_bul4.exe vssadmin.exe PID 828 wrote to memory of 588 828 64ME_bul4.exe vssadmin.exe PID 828 wrote to memory of 588 828 64ME_bul4.exe vssadmin.exe PID 828 wrote to memory of 588 828 64ME_bul4.exe vssadmin.exe PID 828 wrote to memory of 976 828 64ME_bul4.exe wmic.exe PID 828 wrote to memory of 976 828 64ME_bul4.exe wmic.exe PID 828 wrote to memory of 976 828 64ME_bul4.exe wmic.exe PID 828 wrote to memory of 976 828 64ME_bul4.exe wmic.exe PID 828 wrote to memory of 1840 828 64ME_bul4.exe vssadmin.exe PID 828 wrote to memory of 1840 828 64ME_bul4.exe vssadmin.exe PID 828 wrote to memory of 1840 828 64ME_bul4.exe vssadmin.exe PID 828 wrote to memory of 1840 828 64ME_bul4.exe vssadmin.exe PID 828 wrote to memory of 780 828 64ME_bul4.exe wmic.exe PID 828 wrote to memory of 780 828 64ME_bul4.exe wmic.exe PID 828 wrote to memory of 780 828 64ME_bul4.exe wmic.exe PID 828 wrote to memory of 780 828 64ME_bul4.exe wmic.exe PID 1408 wrote to memory of 292 1408 taskeng.exe svhost.exe PID 1408 wrote to memory of 292 1408 taskeng.exe svhost.exe PID 1408 wrote to memory of 292 1408 taskeng.exe svhost.exe PID 1408 wrote to memory of 292 1408 taskeng.exe svhost.exe -
System policy modification 1 TTPs 3 IoCs
Processes:
64ME_bul4.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul4.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" 64ME_bul4.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1" 64ME_bul4.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\64ME_bul4.exe"C:\Users\Admin\AppData\Local\Temp\64ME_bul4.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:828 -
C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:1876
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:912
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:588
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:976
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:1840
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:780
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1568
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C:\Windows\system32\taskeng.exetaskeng.exe {5447EB28-1178-45E7-8A51-2AA4079419AA} S-1-5-21-3845472200-3839195424-595303356-1000:ZERMMMDR\Admin:Interactive:[1]1⤵
- Suspicious use of WriteProcessMemory
PID:1408 -
C:\Users\Admin\AppData\Roaming\svhost.exeC:\Users\Admin\AppData\Roaming\svhost.exe2⤵
- Executes dropped EXE
PID:292
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
666KB
MD53adfa0251f25bf5766d96ae7e080c9bc
SHA1346882da16b892462929e08e084e7fccf89c2afb
SHA2569555810647200a6eda75dfe1527c1d8720e929b19a6086e536fb4fce4d9db485
SHA5129c7e05c42bab4455556c7dec89ef8df274010a3cefcf59641a0f23b984826c373df364c5b59188e932136be87ec9b30dba11bf2b6bd9ad9ba4880679fa052622
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Filesize
666KB
MD53adfa0251f25bf5766d96ae7e080c9bc
SHA1346882da16b892462929e08e084e7fccf89c2afb
SHA2569555810647200a6eda75dfe1527c1d8720e929b19a6086e536fb4fce4d9db485
SHA5129c7e05c42bab4455556c7dec89ef8df274010a3cefcf59641a0f23b984826c373df364c5b59188e932136be87ec9b30dba11bf2b6bd9ad9ba4880679fa052622