Analysis
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max time kernel
150s -
max time network
33s -
platform
windows7_x64 -
resource
win7-20221111-en -
resource tags
arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system -
submitted
06-01-2023 19:39
Behavioral task
behavioral1
Sample
64ME_bul2.exe
Resource
win7-20221111-en
Behavioral task
behavioral2
Sample
64ME_bul2.exe
Resource
win10v2004-20220812-en
General
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Target
64ME_bul2.exe
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Size
666KB
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MD5
b64ced51ca13ef75fa0347d3a638555a
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SHA1
6a1a46a0de15e81a8157bf3d3e9e1cb498791e3f
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SHA256
a533f9ae8f269f97eeb35ddac6d1d955924f6eea1794b8a227457e95cf524d44
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SHA512
a12b84663ecdc89b30abe94ba49de3b3277e0bd9a8194787eb066abb6f2bc6328abdeb63341c71e5c8a6fe4459c5387b0480c93e0e3e786f3984f81fe890a4f7
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SSDEEP
12288:ZYW1LNT35lDbK/LIVaN8+T7vwqyqhYMhWt918vulAVC9+m:dd35lDbKDIwWUDyqS5omYC9+
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_bul2.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul2.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" 64ME_bul2.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 1608 svhost.exe -
Modifies extensions of user files 12 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
64ME_bul2.exedescription ioc process File renamed C:\Users\Admin\Pictures\UnregisterImport.png => C:\Users\Admin\Pictures\UnregisterImport.png.bulwark2 64ME_bul2.exe File opened for modification C:\Users\Admin\Pictures\DenyConvert.tiff 64ME_bul2.exe File renamed C:\Users\Admin\Pictures\DenyConvert.tiff => C:\Users\Admin\Pictures\DenyConvert.tiff.bulwark2 64ME_bul2.exe File renamed C:\Users\Admin\Pictures\HideGrant.crw => C:\Users\Admin\Pictures\HideGrant.crw.bulwark2 64ME_bul2.exe File renamed C:\Users\Admin\Pictures\InvokeReceive.png => C:\Users\Admin\Pictures\InvokeReceive.png.bulwark2 64ME_bul2.exe File renamed C:\Users\Admin\Pictures\RenameAdd.tiff => C:\Users\Admin\Pictures\RenameAdd.tiff.bulwark2 64ME_bul2.exe File renamed C:\Users\Admin\Pictures\SkipDebug.tif => C:\Users\Admin\Pictures\SkipDebug.tif.bulwark2 64ME_bul2.exe File renamed C:\Users\Admin\Pictures\SuspendShow.png => C:\Users\Admin\Pictures\SuspendShow.png.bulwark2 64ME_bul2.exe File renamed C:\Users\Admin\Pictures\CloseUnblock.crw => C:\Users\Admin\Pictures\CloseUnblock.crw.bulwark2 64ME_bul2.exe File opened for modification C:\Users\Admin\Pictures\RenameAdd.tiff 64ME_bul2.exe File renamed C:\Users\Admin\Pictures\UseAssert.crw => C:\Users\Admin\Pictures\UseAssert.crw.bulwark2 64ME_bul2.exe File renamed C:\Users\Admin\Pictures\WaitMove.raw => C:\Users\Admin\Pictures\WaitMove.raw.bulwark2 64ME_bul2.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_bul2.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul2.exe -
Drops desktop.ini file(s) 1 IoCs
Processes:
64ME_bul2.exedescription ioc process File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-3406023954-474543476-3319432036-1000\desktop.ini 64ME_bul2.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_bul2.exedescription ioc process File opened (read-only) \??\G: 64ME_bul2.exe File opened (read-only) \??\I: 64ME_bul2.exe File opened (read-only) \??\J: 64ME_bul2.exe File opened (read-only) \??\U: 64ME_bul2.exe File opened (read-only) \??\W: 64ME_bul2.exe File opened (read-only) \??\Y: 64ME_bul2.exe File opened (read-only) \??\F: 64ME_bul2.exe File opened (read-only) \??\L: 64ME_bul2.exe File opened (read-only) \??\M: 64ME_bul2.exe File opened (read-only) \??\T: 64ME_bul2.exe File opened (read-only) \??\V: 64ME_bul2.exe File opened (read-only) \??\X: 64ME_bul2.exe File opened (read-only) \??\Z: 64ME_bul2.exe File opened (read-only) \??\B: 64ME_bul2.exe File opened (read-only) \??\N: 64ME_bul2.exe File opened (read-only) \??\O: 64ME_bul2.exe File opened (read-only) \??\K: 64ME_bul2.exe File opened (read-only) \??\P: 64ME_bul2.exe File opened (read-only) \??\Q: 64ME_bul2.exe File opened (read-only) \??\R: 64ME_bul2.exe File opened (read-only) \??\S: 64ME_bul2.exe File opened (read-only) \??\A: 64ME_bul2.exe File opened (read-only) \??\E: 64ME_bul2.exe File opened (read-only) \??\H: 64ME_bul2.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 1824 vssadmin.exe 812 vssadmin.exe 1404 vssadmin.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
Processes:
64ME_bul2.exepid process 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe 1284 64ME_bul2.exe -
Suspicious use of AdjustPrivilegeToken 63 IoCs
Processes:
vssvc.exewmic.exewmic.exewmic.exedescription pid process Token: SeBackupPrivilege 1504 vssvc.exe Token: SeRestorePrivilege 1504 vssvc.exe Token: SeAuditPrivilege 1504 vssvc.exe Token: SeIncreaseQuotaPrivilege 1092 wmic.exe Token: SeSecurityPrivilege 1092 wmic.exe Token: SeTakeOwnershipPrivilege 1092 wmic.exe Token: SeLoadDriverPrivilege 1092 wmic.exe Token: SeSystemProfilePrivilege 1092 wmic.exe Token: SeSystemtimePrivilege 1092 wmic.exe Token: SeProfSingleProcessPrivilege 1092 wmic.exe Token: SeIncBasePriorityPrivilege 1092 wmic.exe Token: SeCreatePagefilePrivilege 1092 wmic.exe Token: SeBackupPrivilege 1092 wmic.exe Token: SeRestorePrivilege 1092 wmic.exe Token: SeShutdownPrivilege 1092 wmic.exe Token: SeDebugPrivilege 1092 wmic.exe Token: SeSystemEnvironmentPrivilege 1092 wmic.exe Token: SeRemoteShutdownPrivilege 1092 wmic.exe Token: SeUndockPrivilege 1092 wmic.exe Token: SeManageVolumePrivilege 1092 wmic.exe Token: 33 1092 wmic.exe Token: 34 1092 wmic.exe Token: 35 1092 wmic.exe Token: SeIncreaseQuotaPrivilege 932 wmic.exe Token: SeSecurityPrivilege 932 wmic.exe Token: SeTakeOwnershipPrivilege 932 wmic.exe Token: SeLoadDriverPrivilege 932 wmic.exe Token: SeSystemProfilePrivilege 932 wmic.exe Token: SeSystemtimePrivilege 932 wmic.exe Token: SeProfSingleProcessPrivilege 932 wmic.exe Token: SeIncBasePriorityPrivilege 932 wmic.exe Token: SeCreatePagefilePrivilege 932 wmic.exe Token: SeBackupPrivilege 932 wmic.exe Token: SeRestorePrivilege 932 wmic.exe Token: SeShutdownPrivilege 932 wmic.exe Token: SeDebugPrivilege 932 wmic.exe Token: SeSystemEnvironmentPrivilege 932 wmic.exe Token: SeRemoteShutdownPrivilege 932 wmic.exe Token: SeUndockPrivilege 932 wmic.exe Token: SeManageVolumePrivilege 932 wmic.exe Token: 33 932 wmic.exe Token: 34 932 wmic.exe Token: 35 932 wmic.exe Token: SeIncreaseQuotaPrivilege 700 wmic.exe Token: SeSecurityPrivilege 700 wmic.exe Token: SeTakeOwnershipPrivilege 700 wmic.exe Token: SeLoadDriverPrivilege 700 wmic.exe Token: SeSystemProfilePrivilege 700 wmic.exe Token: SeSystemtimePrivilege 700 wmic.exe Token: SeProfSingleProcessPrivilege 700 wmic.exe Token: SeIncBasePriorityPrivilege 700 wmic.exe Token: SeCreatePagefilePrivilege 700 wmic.exe Token: SeBackupPrivilege 700 wmic.exe Token: SeRestorePrivilege 700 wmic.exe Token: SeShutdownPrivilege 700 wmic.exe Token: SeDebugPrivilege 700 wmic.exe Token: SeSystemEnvironmentPrivilege 700 wmic.exe Token: SeRemoteShutdownPrivilege 700 wmic.exe Token: SeUndockPrivilege 700 wmic.exe Token: SeManageVolumePrivilege 700 wmic.exe Token: 33 700 wmic.exe Token: 34 700 wmic.exe Token: 35 700 wmic.exe -
Suspicious use of WriteProcessMemory 28 IoCs
Processes:
64ME_bul2.exetaskeng.exedescription pid process target process PID 1284 wrote to memory of 1404 1284 64ME_bul2.exe vssadmin.exe PID 1284 wrote to memory of 1404 1284 64ME_bul2.exe vssadmin.exe PID 1284 wrote to memory of 1404 1284 64ME_bul2.exe vssadmin.exe PID 1284 wrote to memory of 1404 1284 64ME_bul2.exe vssadmin.exe PID 1284 wrote to memory of 1092 1284 64ME_bul2.exe wmic.exe PID 1284 wrote to memory of 1092 1284 64ME_bul2.exe wmic.exe PID 1284 wrote to memory of 1092 1284 64ME_bul2.exe wmic.exe PID 1284 wrote to memory of 1092 1284 64ME_bul2.exe wmic.exe PID 1284 wrote to memory of 1824 1284 64ME_bul2.exe vssadmin.exe PID 1284 wrote to memory of 1824 1284 64ME_bul2.exe vssadmin.exe PID 1284 wrote to memory of 1824 1284 64ME_bul2.exe vssadmin.exe PID 1284 wrote to memory of 1824 1284 64ME_bul2.exe vssadmin.exe PID 1284 wrote to memory of 932 1284 64ME_bul2.exe wmic.exe PID 1284 wrote to memory of 932 1284 64ME_bul2.exe wmic.exe PID 1284 wrote to memory of 932 1284 64ME_bul2.exe wmic.exe PID 1284 wrote to memory of 932 1284 64ME_bul2.exe wmic.exe PID 1284 wrote to memory of 812 1284 64ME_bul2.exe vssadmin.exe PID 1284 wrote to memory of 812 1284 64ME_bul2.exe vssadmin.exe PID 1284 wrote to memory of 812 1284 64ME_bul2.exe vssadmin.exe PID 1284 wrote to memory of 812 1284 64ME_bul2.exe vssadmin.exe PID 1284 wrote to memory of 700 1284 64ME_bul2.exe wmic.exe PID 1284 wrote to memory of 700 1284 64ME_bul2.exe wmic.exe PID 1284 wrote to memory of 700 1284 64ME_bul2.exe wmic.exe PID 1284 wrote to memory of 700 1284 64ME_bul2.exe wmic.exe PID 1636 wrote to memory of 1608 1636 taskeng.exe svhost.exe PID 1636 wrote to memory of 1608 1636 taskeng.exe svhost.exe PID 1636 wrote to memory of 1608 1636 taskeng.exe svhost.exe PID 1636 wrote to memory of 1608 1636 taskeng.exe svhost.exe -
System policy modification 1 TTPs 3 IoCs
Processes:
64ME_bul2.exedescription ioc process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 64ME_bul2.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" 64ME_bul2.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1" 64ME_bul2.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\64ME_bul2.exe"C:\Users\Admin\AppData\Local\Temp\64ME_bul2.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:1284 -
C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:1404
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1092
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:1824
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:932
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:812
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:700
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1504
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C:\Windows\system32\taskeng.exetaskeng.exe {0A7B7C54-BA6E-4C39-9741-842ED2AE76E8} S-1-5-21-3406023954-474543476-3319432036-1000:VUIIVLGQ\Admin:Interactive:[1]1⤵
- Suspicious use of WriteProcessMemory
PID:1636 -
C:\Users\Admin\AppData\Roaming\svhost.exeC:\Users\Admin\AppData\Roaming\svhost.exe2⤵
- Executes dropped EXE
PID:1608
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
666KB
MD5b64ced51ca13ef75fa0347d3a638555a
SHA16a1a46a0de15e81a8157bf3d3e9e1cb498791e3f
SHA256a533f9ae8f269f97eeb35ddac6d1d955924f6eea1794b8a227457e95cf524d44
SHA512a12b84663ecdc89b30abe94ba49de3b3277e0bd9a8194787eb066abb6f2bc6328abdeb63341c71e5c8a6fe4459c5387b0480c93e0e3e786f3984f81fe890a4f7
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Filesize
666KB
MD5b64ced51ca13ef75fa0347d3a638555a
SHA16a1a46a0de15e81a8157bf3d3e9e1cb498791e3f
SHA256a533f9ae8f269f97eeb35ddac6d1d955924f6eea1794b8a227457e95cf524d44
SHA512a12b84663ecdc89b30abe94ba49de3b3277e0bd9a8194787eb066abb6f2bc6328abdeb63341c71e5c8a6fe4459c5387b0480c93e0e3e786f3984f81fe890a4f7