Analysis
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max time kernel
273s -
max time network
115s -
platform
windows7_x64 -
resource
win7v20210408 -
submitted
18-09-2021 11:29
Static task
static1
Behavioral task
behavioral1
Sample
svhost.exe
Resource
win7v20210408
windows7_x64
0 signatures
0 seconds
Behavioral task
behavioral2
Sample
svhost.exe
Resource
win10-en
windows10_x64
0 signatures
0 seconds
General
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Target
svhost.exe
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Size
669KB
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MD5
5ec29d96f5fefb2d726f9e120786eaa9
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SHA1
3f8d050bd4e823b1f2c681856d1ae6d9007d5861
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SHA256
8ee1f51602f957fa82c7e9c0d834d28873307a0c576ab8c7cc99ca85fcf43b2e
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SHA512
e21682f2bfee29cd0c0765a10463b2f57bde5996fa367ee2b8b6f7fae9bf5703aec24319ddf2e33890b352331f8fedda41d79ff04ec8a881a6469f6bdba0d5ff
Malware Config
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 behavioral1/files/0x00040000000130b1-67.dat family_medusalocker behavioral1/files/0x00040000000130b1-69.dat family_medusalocker -
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 1580 svhost.exe -
Modifies extensions of user files 6 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
svhost.exedescription ioc Process File renamed C:\Users\Admin\Pictures\CopyUnregister.tif => C:\Users\Admin\Pictures\CopyUnregister.tif.read svhost.exe File renamed C:\Users\Admin\Pictures\MoveHide.raw => C:\Users\Admin\Pictures\MoveHide.raw.read svhost.exe File renamed C:\Users\Admin\Pictures\OutJoin.png => C:\Users\Admin\Pictures\OutJoin.png.read svhost.exe File renamed C:\Users\Admin\Pictures\PublishOut.png => C:\Users\Admin\Pictures\PublishOut.png.read svhost.exe File renamed C:\Users\Admin\Pictures\StartConnect.crw => C:\Users\Admin\Pictures\StartConnect.crw.read svhost.exe File renamed C:\Users\Admin\Pictures\UnprotectOpen.crw => C:\Users\Admin\Pictures\UnprotectOpen.crw.read 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:
svhost.exedescription ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" svhost.exe -
Drops desktop.ini file(s) 1 IoCs
Processes:
svhost.exedescription ioc Process File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-2455352368-1077083310-2879168483-1000\desktop.ini svhost.exe -
Enumerates connected drives 3 TTPs 24 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
Processes:
svhost.exedescription ioc Process File opened (read-only) \??\Q: svhost.exe File opened (read-only) \??\U: svhost.exe File opened (read-only) \??\W: svhost.exe File opened (read-only) \??\A: svhost.exe File opened (read-only) \??\H: svhost.exe File opened (read-only) \??\I: svhost.exe File opened (read-only) \??\J: svhost.exe File opened (read-only) \??\L: svhost.exe File opened (read-only) \??\R: svhost.exe File opened (read-only) \??\T: svhost.exe File opened (read-only) \??\Y: svhost.exe File opened (read-only) \??\B: svhost.exe File opened (read-only) \??\F: svhost.exe File opened (read-only) \??\M: svhost.exe File opened (read-only) \??\N: svhost.exe File opened (read-only) \??\P: svhost.exe File opened (read-only) \??\Z: svhost.exe File opened (read-only) \??\V: svhost.exe File opened (read-only) \??\X: svhost.exe File opened (read-only) \??\E: svhost.exe File opened (read-only) \??\G: svhost.exe File opened (read-only) \??\K: svhost.exe File opened (read-only) \??\O: svhost.exe File opened (read-only) \??\S: svhost.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 280 vssadmin.exe 1860 vssadmin.exe 2012 vssadmin.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
Processes:
svhost.exepid Process 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe 1248 svhost.exe -
Suspicious use of AdjustPrivilegeToken 63 IoCs
Processes:
vssvc.exewmic.exewmic.exewmic.exedescription pid Process Token: SeBackupPrivilege 1924 vssvc.exe Token: SeRestorePrivilege 1924 vssvc.exe Token: SeAuditPrivilege 1924 vssvc.exe Token: SeIncreaseQuotaPrivilege 1152 wmic.exe Token: SeSecurityPrivilege 1152 wmic.exe Token: SeTakeOwnershipPrivilege 1152 wmic.exe Token: SeLoadDriverPrivilege 1152 wmic.exe Token: SeSystemProfilePrivilege 1152 wmic.exe Token: SeSystemtimePrivilege 1152 wmic.exe Token: SeProfSingleProcessPrivilege 1152 wmic.exe Token: SeIncBasePriorityPrivilege 1152 wmic.exe Token: SeCreatePagefilePrivilege 1152 wmic.exe Token: SeBackupPrivilege 1152 wmic.exe Token: SeRestorePrivilege 1152 wmic.exe Token: SeShutdownPrivilege 1152 wmic.exe Token: SeDebugPrivilege 1152 wmic.exe Token: SeSystemEnvironmentPrivilege 1152 wmic.exe Token: SeRemoteShutdownPrivilege 1152 wmic.exe Token: SeUndockPrivilege 1152 wmic.exe Token: SeManageVolumePrivilege 1152 wmic.exe Token: 33 1152 wmic.exe Token: 34 1152 wmic.exe Token: 35 1152 wmic.exe Token: SeIncreaseQuotaPrivilege 1692 wmic.exe Token: SeSecurityPrivilege 1692 wmic.exe Token: SeTakeOwnershipPrivilege 1692 wmic.exe Token: SeLoadDriverPrivilege 1692 wmic.exe Token: SeSystemProfilePrivilege 1692 wmic.exe Token: SeSystemtimePrivilege 1692 wmic.exe Token: SeProfSingleProcessPrivilege 1692 wmic.exe Token: SeIncBasePriorityPrivilege 1692 wmic.exe Token: SeCreatePagefilePrivilege 1692 wmic.exe Token: SeBackupPrivilege 1692 wmic.exe Token: SeRestorePrivilege 1692 wmic.exe Token: SeShutdownPrivilege 1692 wmic.exe Token: SeDebugPrivilege 1692 wmic.exe Token: SeSystemEnvironmentPrivilege 1692 wmic.exe Token: SeRemoteShutdownPrivilege 1692 wmic.exe Token: SeUndockPrivilege 1692 wmic.exe Token: SeManageVolumePrivilege 1692 wmic.exe Token: 33 1692 wmic.exe Token: 34 1692 wmic.exe Token: 35 1692 wmic.exe Token: SeIncreaseQuotaPrivilege 2036 wmic.exe Token: SeSecurityPrivilege 2036 wmic.exe Token: SeTakeOwnershipPrivilege 2036 wmic.exe Token: SeLoadDriverPrivilege 2036 wmic.exe Token: SeSystemProfilePrivilege 2036 wmic.exe Token: SeSystemtimePrivilege 2036 wmic.exe Token: SeProfSingleProcessPrivilege 2036 wmic.exe Token: SeIncBasePriorityPrivilege 2036 wmic.exe Token: SeCreatePagefilePrivilege 2036 wmic.exe Token: SeBackupPrivilege 2036 wmic.exe Token: SeRestorePrivilege 2036 wmic.exe Token: SeShutdownPrivilege 2036 wmic.exe Token: SeDebugPrivilege 2036 wmic.exe Token: SeSystemEnvironmentPrivilege 2036 wmic.exe Token: SeRemoteShutdownPrivilege 2036 wmic.exe Token: SeUndockPrivilege 2036 wmic.exe Token: SeManageVolumePrivilege 2036 wmic.exe Token: 33 2036 wmic.exe Token: 34 2036 wmic.exe Token: 35 2036 wmic.exe -
Suspicious use of WriteProcessMemory 28 IoCs
Processes:
svhost.exetaskeng.exedescription pid Process procid_target PID 1248 wrote to memory of 280 1248 svhost.exe 25 PID 1248 wrote to memory of 280 1248 svhost.exe 25 PID 1248 wrote to memory of 280 1248 svhost.exe 25 PID 1248 wrote to memory of 280 1248 svhost.exe 25 PID 1248 wrote to memory of 1152 1248 svhost.exe 29 PID 1248 wrote to memory of 1152 1248 svhost.exe 29 PID 1248 wrote to memory of 1152 1248 svhost.exe 29 PID 1248 wrote to memory of 1152 1248 svhost.exe 29 PID 1248 wrote to memory of 1860 1248 svhost.exe 31 PID 1248 wrote to memory of 1860 1248 svhost.exe 31 PID 1248 wrote to memory of 1860 1248 svhost.exe 31 PID 1248 wrote to memory of 1860 1248 svhost.exe 31 PID 1248 wrote to memory of 1692 1248 svhost.exe 33 PID 1248 wrote to memory of 1692 1248 svhost.exe 33 PID 1248 wrote to memory of 1692 1248 svhost.exe 33 PID 1248 wrote to memory of 1692 1248 svhost.exe 33 PID 1248 wrote to memory of 2012 1248 svhost.exe 35 PID 1248 wrote to memory of 2012 1248 svhost.exe 35 PID 1248 wrote to memory of 2012 1248 svhost.exe 35 PID 1248 wrote to memory of 2012 1248 svhost.exe 35 PID 1248 wrote to memory of 2036 1248 svhost.exe 37 PID 1248 wrote to memory of 2036 1248 svhost.exe 37 PID 1248 wrote to memory of 2036 1248 svhost.exe 37 PID 1248 wrote to memory of 2036 1248 svhost.exe 37 PID 1860 wrote to memory of 1580 1860 taskeng.exe 44 PID 1860 wrote to memory of 1580 1860 taskeng.exe 44 PID 1860 wrote to memory of 1580 1860 taskeng.exe 44 PID 1860 wrote to memory of 1580 1860 taskeng.exe 44 -
System policy modification 1 TTPs 3 IoCs
Processes:
svhost.exedescription ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" svhost.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" svhost.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1" svhost.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\svhost.exe"C:\Users\Admin\AppData\Local\Temp\svhost.exe"1⤵
- 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:1248 -
C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:280
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1152
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:1860
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1692
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- Interacts with shadow copies
PID:2012
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- Suspicious use of AdjustPrivilegeToken
PID:2036
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1924
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C:\Windows\system32\taskeng.exetaskeng.exe {DDC2DC0B-4F34-47EA-BEE5-82F666B0318A} S-1-5-21-2455352368-1077083310-2879168483-1000:QWOCTUPM\Admin:Interactive:[1]1⤵
- Suspicious use of WriteProcessMemory
PID:1860 -
C:\Users\Admin\AppData\Roaming\svhost.exeC:\Users\Admin\AppData\Roaming\svhost.exe2⤵
- Executes dropped EXE
PID:1580
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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MD5
5ec29d96f5fefb2d726f9e120786eaa9
SHA13f8d050bd4e823b1f2c681856d1ae6d9007d5861
SHA2568ee1f51602f957fa82c7e9c0d834d28873307a0c576ab8c7cc99ca85fcf43b2e
SHA512e21682f2bfee29cd0c0765a10463b2f57bde5996fa367ee2b8b6f7fae9bf5703aec24319ddf2e33890b352331f8fedda41d79ff04ec8a881a6469f6bdba0d5ff
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MD5
5ec29d96f5fefb2d726f9e120786eaa9
SHA13f8d050bd4e823b1f2c681856d1ae6d9007d5861
SHA2568ee1f51602f957fa82c7e9c0d834d28873307a0c576ab8c7cc99ca85fcf43b2e
SHA512e21682f2bfee29cd0c0765a10463b2f57bde5996fa367ee2b8b6f7fae9bf5703aec24319ddf2e33890b352331f8fedda41d79ff04ec8a881a6469f6bdba0d5ff