9148d2b6261ad24c5d585fabc348dc4df3db5cda6b667e84ee3215d23df3f86d

Windows Service

Disable or Modify Tools

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\DisableAntiSpyware = "1"	prevhost.exe

Modifies Windows Defender Real-time Protection settings 3 TTPs 7 IoCs

defense_evasion trojan

Modify Registry

Windows Service

Disable or Modify Tools

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBlockAtFirstSeen = "1"	prevhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableIOAVProtection = "1"	prevhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	prevhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	prevhost.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	prevhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableRealtimeMonitoring = "1"	prevhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	prevhost.exe

Windows security bypass 2 TTPs 3 IoCs

defense_evasion trojan

Disable or Modify Tools

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes	prevhost.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	prevhost.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Extensions	prevhost.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
5868	powershell.exe
5952	powershell.exe
3648	powershell.exe
792	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
1408	prevhost.exe

Accesses Microsoft Outlook profiles 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-552508041-2681165170-3229858294-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	prevhost.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-552508041-2681165170-3229858294-1000\Software\Microsoft\Windows\CurrentVersion\Run\prevhost = "C:\\Users\\Admin\\AppData\\Roaming\\prevhost.exe"	prevhost.exe

Looks up external IP address via web service 1 TTPs 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

discovery

Internet Connection Discovery

T1016.001

flow	ioc
1	icanhazip.com

Hide Artifacts: Hidden Files and Directories 1 TTPs 1 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
3716	cmd.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 5896 set thread context of 1380	5896	prevhost.exe	119
PID 5896 set thread context of 5684	5896	prevhost.exe	120

Command and Scripting Interpreter: JavaScript 1 TTPs
execution

JavaScript
T1059.007
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	prevhost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	prevhost.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
5868	powershell.exe
5868	powershell.exe
792	powershell.exe
792	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
3648	powershell.exe
3648	powershell.exe
3648	powershell.exe
5896	prevhost.exe
5896	prevhost.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5952	powershell.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe
5896	prevhost.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
5952	powershell.exe
5952	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	5868	powershell.exe
Token: SeDebugPrivilege	792	powershell.exe
Token: SeDebugPrivilege	5952	powershell.exe
Token: SeIncreaseQuotaPrivilege	5952	powershell.exe
Token: SeSecurityPrivilege	5952	powershell.exe
Token: SeTakeOwnershipPrivilege	5952	powershell.exe
Token: SeLoadDriverPrivilege	5952	powershell.exe
Token: SeSystemProfilePrivilege	5952	powershell.exe
Token: SeSystemtimePrivilege	5952	powershell.exe
Token: SeProfSingleProcessPrivilege	5952	powershell.exe
Token: SeIncBasePriorityPrivilege	5952	powershell.exe
Token: SeCreatePagefilePrivilege	5952	powershell.exe
Token: SeBackupPrivilege	5952	powershell.exe
Token: SeRestorePrivilege	5952	powershell.exe
Token: SeShutdownPrivilege	5952	powershell.exe
Token: SeDebugPrivilege	5952	powershell.exe
Token: SeSystemEnvironmentPrivilege	5952	powershell.exe
Token: SeRemoteShutdownPrivilege	5952	powershell.exe
Token: SeUndockPrivilege	5952	powershell.exe
Token: SeManageVolumePrivilege	5952	powershell.exe
Token: 33	5952	powershell.exe
Token: 34	5952	powershell.exe
Token: 35	5952	powershell.exe
Token: 36	5952	powershell.exe
Token: SeDebugPrivilege	5896	prevhost.exe
Token: SeIncreaseQuotaPrivilege	5952	powershell.exe
Token: SeSecurityPrivilege	5952	powershell.exe
Token: SeTakeOwnershipPrivilege	5952	powershell.exe
Token: SeLoadDriverPrivilege	5952	powershell.exe
Token: SeSystemProfilePrivilege	5952	powershell.exe
Token: SeSystemtimePrivilege	5952	powershell.exe
Token: SeProfSingleProcessPrivilege	5952	powershell.exe
Token: SeIncBasePriorityPrivilege	5952	powershell.exe
Token: SeCreatePagefilePrivilege	5952	powershell.exe
Token: SeBackupPrivilege	5952	powershell.exe
Token: SeRestorePrivilege	5952	powershell.exe
Token: SeShutdownPrivilege	5952	powershell.exe
Token: SeDebugPrivilege	5952	powershell.exe
Token: SeSystemEnvironmentPrivilege	5952	powershell.exe
Token: SeRemoteShutdownPrivilege	5952	powershell.exe
Token: SeUndockPrivilege	5952	powershell.exe
Token: SeManageVolumePrivilege	5952	powershell.exe
Token: 33	5952	powershell.exe
Token: 34	5952	powershell.exe
Token: 35	5952	powershell.exe
Token: 36	5952	powershell.exe
Token: SeIncreaseQuotaPrivilege	5952	powershell.exe
Token: SeSecurityPrivilege	5952	powershell.exe
Token: SeTakeOwnershipPrivilege	5952	powershell.exe
Token: SeLoadDriverPrivilege	5952	powershell.exe
Token: SeSystemProfilePrivilege	5952	powershell.exe
Token: SeSystemtimePrivilege	5952	powershell.exe
Token: SeProfSingleProcessPrivilege	5952	powershell.exe
Token: SeIncBasePriorityPrivilege	5952	powershell.exe
Token: SeCreatePagefilePrivilege	5952	powershell.exe
Token: SeBackupPrivilege	5952	powershell.exe
Token: SeRestorePrivilege	5952	powershell.exe
Token: SeShutdownPrivilege	5952	powershell.exe
Token: SeDebugPrivilege	5952	powershell.exe
Token: SeSystemEnvironmentPrivilege	5952	powershell.exe
Token: SeRemoteShutdownPrivilege	5952	powershell.exe
Token: SeUndockPrivilege	5952	powershell.exe
Token: SeManageVolumePrivilege	5952	powershell.exe
Token: 33	5952	powershell.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1252	msiexec.exe
5448	msiexec.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 1392 wrote to memory of 5868	1392	wscript.exe	89
PID 1392 wrote to memory of 3716	1392	wscript.exe	91
PID 3716 wrote to memory of 792	3716	cmd.exe	93
PID 3716 wrote to memory of 2804	3716	cmd.exe	94
PID 3716 wrote to memory of 2308	3716	cmd.exe	95
PID 3716 wrote to memory of 1708	3716	cmd.exe	96
PID 3716 wrote to memory of 2104	3716	cmd.exe	97
PID 3716 wrote to memory of 1864	3716	cmd.exe	98
PID 3716 wrote to memory of 3836	3716	cmd.exe	99
PID 3716 wrote to memory of 3048	3716	cmd.exe	100
PID 3716 wrote to memory of 3496	3716	cmd.exe	101
PID 3716 wrote to memory of 5952	3716	cmd.exe	102
PID 3716 wrote to memory of 5404	3716	cmd.exe	104
PID 5952 wrote to memory of 5656	5952	powershell.exe	106
PID 5656 wrote to memory of 4836	5656	csc.exe	107
PID 5952 wrote to memory of 4164	5952	powershell.exe	108
PID 4164 wrote to memory of 996	4164	csc.exe	109
PID 5952 wrote to memory of 1252	5952	powershell.exe	110
PID 5952 wrote to memory of 5448	5952	powershell.exe	111
PID 5952 wrote to memory of 4752	5952	powershell.exe	112
PID 5448 wrote to memory of 5896	5448	msiexec.exe	113
PID 5448 wrote to memory of 5896	5448	msiexec.exe	113
PID 5448 wrote to memory of 5896	5448	msiexec.exe	113
PID 5896 wrote to memory of 3648	5896	prevhost.exe	114
PID 5896 wrote to memory of 1380	5896	prevhost.exe	119
PID 5896 wrote to memory of 1380	5896	prevhost.exe	119
PID 5896 wrote to memory of 1380	5896	prevhost.exe	119
PID 5896 wrote to memory of 1380	5896	prevhost.exe	119
PID 5896 wrote to memory of 1380	5896	prevhost.exe	119
PID 5896 wrote to memory of 1380	5896	prevhost.exe	119
PID 5896 wrote to memory of 1380	5896	prevhost.exe	119
PID 5896 wrote to memory of 1380	5896	prevhost.exe	119
PID 5896 wrote to memory of 5684	5896	prevhost.exe	120
PID 5896 wrote to memory of 5684	5896	prevhost.exe	120
PID 5896 wrote to memory of 5684	5896	prevhost.exe	120
PID 5896 wrote to memory of 5684	5896	prevhost.exe	120
PID 5896 wrote to memory of 5684	5896	prevhost.exe	120
PID 5896 wrote to memory of 5684	5896	prevhost.exe	120
PID 5896 wrote to memory of 5684	5896	prevhost.exe	120
PID 5896 wrote to memory of 5684	5896	prevhost.exe	120

Views/modifies file attributes 1 TTPs 9 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
3048	attrib.exe
3496	attrib.exe
2308	attrib.exe
1708	attrib.exe
1864	attrib.exe
3836	attrib.exe
5404	attrib.exe
2804	attrib.exe
2104	attrib.exe

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-552508041-2681165170-3229858294-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	prevhost.exe

C:\Windows\system32\wscript.exe
wscript.exe "C:\Users\Admin\AppData\Local\Temp\STATEMENT OF ACCOUNT&_INV NO. 7801.js"
1⤵
- Suspicious use of WriteProcessMemory
PID:1392
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -command $JAGDP=$env:WLUA;$BSVY=$env:VXWTTRHO;$TCWI=$env:WEDA+$env:LBYJXM+$env:NYWLIB+'.'+$env:IGFTMB;[void][IO.Directory]::CreateDirectory([IO.Path]::GetDirectoryName($TCWI));$YAHKQ=foreach($FSFG in [IO.File]::ReadAllLines($BSVY)){if($FSFG.IndexOf($JAGDP)-eq 0){$FSFG.Substring($JAGDP.Length)}};[IO.File]::WriteAllLines($TCWI,[string[]]@($YAHKQ),[Text.Encoding]::ASCII)
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:5868
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c call "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\20267201787236646634.cmd" & attrib +h +s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\20267201787236646634.cmd"
  2⤵
  - Hide Artifacts: Hidden Files and Directories
  - Suspicious use of WriteProcessMemory
  PID:3716
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -WindowStyle Hidden -Command "&($executioncontext.InvokeCommand.NewScriptBlock([string]$env:XLFPUYOWMWX))"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:792
- - C:\Windows\system32\attrib.exe
    attrib -h -s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\*.cmd"
    3⤵
    - Views/modifies file attributes
    PID:2804
- - C:\Windows\system32\attrib.exe
    attrib -h -s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\*.bat"
    3⤵
    - Views/modifies file attributes
    PID:2308
- - C:\Windows\system32\attrib.exe
    attrib -h -s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\timezone_db\timezone_db.dat"
    3⤵
    - Views/modifies file attributes
    PID:1708
- - C:\Windows\system32\attrib.exe
    attrib -h -s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\timezone_db\timezone_db_PDSHXTBW.cmd"
    3⤵
    - Views/modifies file attributes
    PID:2104
- - C:\Windows\system32\attrib.exe
    attrib +h +s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\timezone_db\timezone_db.dat"
    3⤵
    - Views/modifies file attributes
    PID:1864
- - C:\Windows\system32\attrib.exe
    attrib +h +s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\timezone_db\timezone_db_PDSHXTBW.cmd"
    3⤵
    - Views/modifies file attributes
    PID:3836
- - C:\Windows\system32\attrib.exe
    attrib +h +s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\timezone_db"
    3⤵
    - Views/modifies file attributes
    PID:3048
- - C:\Windows\system32\attrib.exe
    attrib +h +s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\20267201787236646634.cmd"
    3⤵
    - Views/modifies file attributes
    PID:3496
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -Command "&($executioncontext.InvokeCommand.NewScriptBlock([string]$env:XLFPUYOWMWX))"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:5952
  - - C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
      "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\t1eark5z\t1eark5z.cmdline"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:5656
    - - C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
        
        C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESD538.tmp" "c:\Users\Admin\AppData\Local\Temp\t1eark5z\CSCE07335DE79DA46D390B54B1CB88BBAF.TMP"
        5⤵
        
        PID:4836
  - - C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
      "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\0rltbp41\0rltbp41.cmdline"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4164
    - - C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
        
        C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESD642.tmp" "c:\Users\Admin\AppData\Local\Temp\0rltbp41\CSC8901C8E778C34FE2857C59016E41922.TMP"
        5⤵
        
        PID:996
  - - C:\Windows\system32\msiexec.exe
      "C:\Windows\system32\msiexec.exe"
      4⤵
      Suspicious use of SetWindowsHookEx
      PID:1252
  - - C:\Windows\system32\msiexec.exe
      "C:\Windows\system32\msiexec.exe"
      4⤵
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:5448
    - - C:\Windows\system32\prevhost.exe
        
        "C:\Windows\system32\prevhost.exe"
        5⤵
        Modifies Windows Defender DisableAntiSpyware settings
        Modifies Windows Defender Real-time Protection settings
        Windows security bypass
        Accesses Microsoft Outlook profiles
        Adds Run key to start application
        Suspicious use of SetThreadContext
        Checks processor information in registry
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        outlook_office_path
        
        PID:5896
      - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -ExecutionPolicy Bypass -Command "New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System' -Name 'DisableTaskMgr' -Value 1 -PropertyType DWord -Force"
        6⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        
        PID:3648
      - C:\Windows\System32\rundll32.exe
        
        "C:\Windows\System32\rundll32.exe" all -k --output-path "C:\Users\Admin\AppData\Local\Temp\8cd060839f8c2b122a7a8fd45bde1537"
        6⤵
        
        PID:1380
      - C:\Windows\System32\rundll32.exe
        
        "C:\Windows\System32\rundll32.exe" all -k --output-path "C:\Users\Admin\AppData\Local\Temp\8cd060839f8c2b122a7a8fd45bde1537"
        6⤵
        
        PID:5684
  - - C:\Windows\system32\choice.exe
      "C:\Windows\system32\choice.exe"
      4⤵
      PID:4752
- - C:\Windows\system32\attrib.exe
    attrib +h +s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\20267201787236646634.cmd"
    3⤵
    - Views/modifies file attributes
    PID:5404

C:\Users\Admin\AppData\Roaming\prevhost.exe
C:\Users\Admin\AppData\Roaming\prevhost.exe
1⤵
- Executes dropped EXE
PID:1408

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

JavaScript

T1059.007

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry