Analysis
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max time kernel
150s -
max time network
47s -
platform
windows7_x64 -
resource
win7-20220901-en -
resource tags
arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system -
submitted
06-01-2023 19:39
Behavioral task
behavioral1
Sample
64ME_bul8.exe
Resource
win7-20220901-en
Behavioral task
behavioral2
Sample
64ME_bul8.exe
Resource
win10v2004-20220812-en
General
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Target
64ME_bul8.exe
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Size
666KB
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MD5
ac8d418b660f7c9585ac97fe524abe8f
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SHA1
653ecc2e07739e59bd5500f535c3f5c6e3d27060
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SHA256
61c26b20a2b291252ccf1b2ae4319542df526e820f96ad4667478ab101b6ee1f
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SHA512
edf33e15bb1d8f97799d25281429451ece9df0ae8c9ead93c301beeac851d802d501d7362c86cee6afb0a2772d58dbef1b17afe9ba84b83324f3959cf2fa7b1c
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SSDEEP
12288:ZYW1LNT35lDbK/LIVaN8+T7vwqyqhYMhWt918vulA/C9+m:dd35lDbKDIwWUDyqS5omqC9+
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_bul8.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul8.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" 64ME_bul8.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 1956 svhost.exe -
Modifies extensions of user files 5 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
64ME_bul8.exedescription ioc process File opened for modification C:\Users\Admin\Pictures\DebugUnlock.tiff 64ME_bul8.exe File renamed C:\Users\Admin\Pictures\DebugUnlock.tiff => C:\Users\Admin\Pictures\DebugUnlock.tiff.bulwark8 64ME_bul8.exe File renamed C:\Users\Admin\Pictures\ExitUnregister.tif => C:\Users\Admin\Pictures\ExitUnregister.tif.bulwark8 64ME_bul8.exe File renamed C:\Users\Admin\Pictures\MeasureSelect.png => C:\Users\Admin\Pictures\MeasureSelect.png.bulwark8 64ME_bul8.exe File renamed C:\Users\Admin\Pictures\StopPush.png => C:\Users\Admin\Pictures\StopPush.png.bulwark8 64ME_bul8.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_bul8.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul8.exe -
Drops desktop.ini file(s) 1 IoCs
Processes:
64ME_bul8.exedescription ioc process File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-4063495947-34355257-727531523-1000\desktop.ini 64ME_bul8.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_bul8.exedescription ioc process File opened (read-only) \??\Z: 64ME_bul8.exe File opened (read-only) \??\B: 64ME_bul8.exe File opened (read-only) \??\F: 64ME_bul8.exe File opened (read-only) \??\R: 64ME_bul8.exe File opened (read-only) \??\S: 64ME_bul8.exe File opened (read-only) \??\G: 64ME_bul8.exe File opened (read-only) \??\H: 64ME_bul8.exe File opened (read-only) \??\N: 64ME_bul8.exe File opened (read-only) \??\T: 64ME_bul8.exe File opened (read-only) \??\P: 64ME_bul8.exe File opened (read-only) \??\U: 64ME_bul8.exe File opened (read-only) \??\V: 64ME_bul8.exe File opened (read-only) \??\X: 64ME_bul8.exe File opened (read-only) \??\E: 64ME_bul8.exe File opened (read-only) \??\J: 64ME_bul8.exe File opened (read-only) \??\M: 64ME_bul8.exe File opened (read-only) \??\O: 64ME_bul8.exe File opened (read-only) \??\Y: 64ME_bul8.exe File opened (read-only) \??\Q: 64ME_bul8.exe File opened (read-only) \??\W: 64ME_bul8.exe File opened (read-only) \??\A: 64ME_bul8.exe File opened (read-only) \??\I: 64ME_bul8.exe File opened (read-only) \??\K: 64ME_bul8.exe File opened (read-only) \??\L: 64ME_bul8.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 1000 vssadmin.exe 2020 vssadmin.exe 680 vssadmin.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
Processes:
64ME_bul8.exepid process 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe 1260 64ME_bul8.exe -
Suspicious use of AdjustPrivilegeToken 63 IoCs
Processes:
vssvc.exewmic.exewmic.exewmic.exedescription pid process Token: SeBackupPrivilege 1168 vssvc.exe Token: SeRestorePrivilege 1168 vssvc.exe Token: SeAuditPrivilege 1168 vssvc.exe Token: SeIncreaseQuotaPrivilege 1636 wmic.exe Token: SeSecurityPrivilege 1636 wmic.exe Token: SeTakeOwnershipPrivilege 1636 wmic.exe Token: SeLoadDriverPrivilege 1636 wmic.exe Token: SeSystemProfilePrivilege 1636 wmic.exe Token: SeSystemtimePrivilege 1636 wmic.exe Token: SeProfSingleProcessPrivilege 1636 wmic.exe Token: SeIncBasePriorityPrivilege 1636 wmic.exe Token: SeCreatePagefilePrivilege 1636 wmic.exe Token: SeBackupPrivilege 1636 wmic.exe Token: SeRestorePrivilege 1636 wmic.exe Token: SeShutdownPrivilege 1636 wmic.exe Token: SeDebugPrivilege 1636 wmic.exe Token: SeSystemEnvironmentPrivilege 1636 wmic.exe Token: SeRemoteShutdownPrivilege 1636 wmic.exe Token: SeUndockPrivilege 1636 wmic.exe Token: SeManageVolumePrivilege 1636 wmic.exe Token: 33 1636 wmic.exe Token: 34 1636 wmic.exe Token: 35 1636 wmic.exe Token: SeIncreaseQuotaPrivilege 1516 wmic.exe Token: SeSecurityPrivilege 1516 wmic.exe Token: SeTakeOwnershipPrivilege 1516 wmic.exe Token: SeLoadDriverPrivilege 1516 wmic.exe Token: SeSystemProfilePrivilege 1516 wmic.exe Token: SeSystemtimePrivilege 1516 wmic.exe Token: SeProfSingleProcessPrivilege 1516 wmic.exe Token: SeIncBasePriorityPrivilege 1516 wmic.exe Token: SeCreatePagefilePrivilege 1516 wmic.exe Token: SeBackupPrivilege 1516 wmic.exe Token: SeRestorePrivilege 1516 wmic.exe Token: SeShutdownPrivilege 1516 wmic.exe Token: SeDebugPrivilege 1516 wmic.exe Token: SeSystemEnvironmentPrivilege 1516 wmic.exe Token: SeRemoteShutdownPrivilege 1516 wmic.exe Token: SeUndockPrivilege 1516 wmic.exe Token: SeManageVolumePrivilege 1516 wmic.exe Token: 33 1516 wmic.exe Token: 34 1516 wmic.exe Token: 35 1516 wmic.exe Token: SeIncreaseQuotaPrivilege 1724 wmic.exe Token: SeSecurityPrivilege 1724 wmic.exe Token: SeTakeOwnershipPrivilege 1724 wmic.exe Token: SeLoadDriverPrivilege 1724 wmic.exe Token: SeSystemProfilePrivilege 1724 wmic.exe Token: SeSystemtimePrivilege 1724 wmic.exe Token: SeProfSingleProcessPrivilege 1724 wmic.exe Token: SeIncBasePriorityPrivilege 1724 wmic.exe Token: SeCreatePagefilePrivilege 1724 wmic.exe Token: SeBackupPrivilege 1724 wmic.exe Token: SeRestorePrivilege 1724 wmic.exe Token: SeShutdownPrivilege 1724 wmic.exe Token: SeDebugPrivilege 1724 wmic.exe Token: SeSystemEnvironmentPrivilege 1724 wmic.exe Token: SeRemoteShutdownPrivilege 1724 wmic.exe Token: SeUndockPrivilege 1724 wmic.exe Token: SeManageVolumePrivilege 1724 wmic.exe Token: 33 1724 wmic.exe Token: 34 1724 wmic.exe Token: 35 1724 wmic.exe -
Suspicious use of WriteProcessMemory 28 IoCs
Processes:
64ME_bul8.exetaskeng.exedescription pid process target process PID 1260 wrote to memory of 2020 1260 64ME_bul8.exe vssadmin.exe PID 1260 wrote to memory of 2020 1260 64ME_bul8.exe vssadmin.exe PID 1260 wrote to memory of 2020 1260 64ME_bul8.exe vssadmin.exe PID 1260 wrote to memory of 2020 1260 64ME_bul8.exe vssadmin.exe PID 1260 wrote to memory of 1636 1260 64ME_bul8.exe wmic.exe PID 1260 wrote to memory of 1636 1260 64ME_bul8.exe wmic.exe PID 1260 wrote to memory of 1636 1260 64ME_bul8.exe wmic.exe PID 1260 wrote to memory of 1636 1260 64ME_bul8.exe wmic.exe PID 1260 wrote to memory of 680 1260 64ME_bul8.exe vssadmin.exe PID 1260 wrote to memory of 680 1260 64ME_bul8.exe vssadmin.exe PID 1260 wrote to memory of 680 1260 64ME_bul8.exe vssadmin.exe PID 1260 wrote to memory of 680 1260 64ME_bul8.exe vssadmin.exe PID 1260 wrote to memory of 1516 1260 64ME_bul8.exe wmic.exe PID 1260 wrote to memory of 1516 1260 64ME_bul8.exe wmic.exe PID 1260 wrote to memory of 1516 1260 64ME_bul8.exe wmic.exe PID 1260 wrote to memory of 1516 1260 64ME_bul8.exe wmic.exe PID 1260 wrote to memory of 1000 1260 64ME_bul8.exe vssadmin.exe PID 1260 wrote to memory of 1000 1260 64ME_bul8.exe vssadmin.exe PID 1260 wrote to memory of 1000 1260 64ME_bul8.exe vssadmin.exe PID 1260 wrote to memory of 1000 1260 64ME_bul8.exe vssadmin.exe PID 1260 wrote to memory of 1724 1260 64ME_bul8.exe wmic.exe PID 1260 wrote to memory of 1724 1260 64ME_bul8.exe wmic.exe PID 1260 wrote to memory of 1724 1260 64ME_bul8.exe wmic.exe PID 1260 wrote to memory of 1724 1260 64ME_bul8.exe wmic.exe PID 1144 wrote to memory of 1956 1144 taskeng.exe svhost.exe PID 1144 wrote to memory of 1956 1144 taskeng.exe svhost.exe PID 1144 wrote to memory of 1956 1144 taskeng.exe svhost.exe PID 1144 wrote to memory of 1956 1144 taskeng.exe svhost.exe -
System policy modification 1 TTPs 3 IoCs
Processes:
64ME_bul8.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul8.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" 64ME_bul8.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1" 64ME_bul8.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\64ME_bul8.exe"C:\Users\Admin\AppData\Local\Temp\64ME_bul8.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:1260 -
C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:2020
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1636
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:680
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1516
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:1000
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1724
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1168
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C:\Windows\system32\taskeng.exetaskeng.exe {2E9C4401-AD52-4190-A1C6-D85FB7A5C5CF} S-1-5-21-4063495947-34355257-727531523-1000:RYNKSFQE\Admin:Interactive:[1]1⤵
- Suspicious use of WriteProcessMemory
PID:1144 -
C:\Users\Admin\AppData\Roaming\svhost.exeC:\Users\Admin\AppData\Roaming\svhost.exe2⤵
- Executes dropped EXE
PID:1956
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
666KB
MD5ac8d418b660f7c9585ac97fe524abe8f
SHA1653ecc2e07739e59bd5500f535c3f5c6e3d27060
SHA25661c26b20a2b291252ccf1b2ae4319542df526e820f96ad4667478ab101b6ee1f
SHA512edf33e15bb1d8f97799d25281429451ece9df0ae8c9ead93c301beeac851d802d501d7362c86cee6afb0a2772d58dbef1b17afe9ba84b83324f3959cf2fa7b1c
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Filesize
666KB
MD5ac8d418b660f7c9585ac97fe524abe8f
SHA1653ecc2e07739e59bd5500f535c3f5c6e3d27060
SHA25661c26b20a2b291252ccf1b2ae4319542df526e820f96ad4667478ab101b6ee1f
SHA512edf33e15bb1d8f97799d25281429451ece9df0ae8c9ead93c301beeac851d802d501d7362c86cee6afb0a2772d58dbef1b17afe9ba84b83324f3959cf2fa7b1c