Analysis
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max time kernel
13s -
max time network
16s -
platform
windows10-2004_x64 -
resource
win10v2004-20240426-en -
resource tags
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submitted
29/04/2024, 17:22
Errors
General
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Target
Winlocker.exe
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Size
18KB
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MD5
f17aa8c813d60fc139510070c83228b1
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SHA1
0ecf72d2d6d3be23300aa16ceea78d551ca98ebf
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SHA256
6c8db88f41c43a13c2dbf6ee8317b0fc6702590c3aac12bdadf7142c524958ac
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SHA512
764693c9beace369424297ee65a15535b6bf26465d849d34bf010061e44b8ef9e0fe82fe88dc52bb2b48a6e197f4da5d51c46a768fee992606d794324677adb9
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SSDEEP
384:NlFftUnn8BYQ3Lq+IyOLVSf9xKo6kYcV6O7UiJFnh:TFfSPTyOLb8YcV6O4izh
Malware Config
Signatures
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Modifies WinLogon for persistence 2 TTPs 2 IoCs
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UAC bypass 3 TTPs 2 IoCs
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Disables Task Manager via registry modification
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Modifies Installed Components in the registry 2 TTPs 1 IoCs
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Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
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Checks whether UAC is enabled 1 TTPs 3 IoCs
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Enumerates connected drives 3 TTPs 2 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Checks SCSI registry key(s) 3 TTPs 36 IoCs
SCSI information is often read in order to detect sandboxing environments.
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Kills process with taskkill 2 IoCs
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Modifies registry class 10 IoCs
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Suspicious use of AdjustPrivilegeToken 12 IoCs
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Suspicious use of FindShellTrayWindow 8 IoCs
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Suspicious use of SendNotifyMessage 10 IoCs
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Suspicious use of SetWindowsHookEx 1 IoCs
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Suspicious use of WriteProcessMemory 11 IoCs
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System policy modification 1 TTPs 2 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\Winlocker.exe"C:\Users\Admin\AppData\Local\Temp\Winlocker.exe"1⤵
- Modifies WinLogon for persistence
- UAC bypass
- Checks computer location settings
- Checks whether UAC is enabled
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
- System policy modification
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C:\Windows\SysWOW64\cmd.exe"cmd.exe" /c taskkill /f /im explorer.exe & taskkill /f /im taskmgr.exe2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /f /im explorer.exe3⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\taskkill.exetaskkill /f /im taskmgr.exe3⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\explorer.exe"C:\Windows\explorer.exe"2⤵
- Modifies Installed Components in the registry
- Enumerates connected drives
- Checks SCSI registry key(s)
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
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C:\Windows\SysWOW64\cmd.exe"cmd.exe" /c shutdown /r /t 02⤵
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C:\Windows\SysWOW64\shutdown.exeshutdown /r /t 03⤵
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C:\Windows\system32\LogonUI.exe"LogonUI.exe" /flags:0x4 /state0:0xa394e055 /state1:0x41c64e6d1⤵
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Defense Evasion
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Impair Defenses
1Disable or Modify Tools
1Modify Registry
4Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
40KB
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Filesize
7.7MB
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Filesize
5.6MB
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Filesize
584KB
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Filesize
64KB
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Filesize
40KB
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Filesize
7.7MB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB
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Filesize
64KB