d3e2efb31b51241ccdc918f73c738276c01947a64bace79d48d896858dedbdc0

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\DisableRealtimeMonitoring = "1"	prevhost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	prevhost.exe
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

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
1960	powershell.exe
2488	powershell.exe
5388	powershell.exe
3592	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
4892	prevhost.exe

Accesses Microsoft Outlook profiles 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3989226554-2204910950-1522900112-1000\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-1-5-21-3989226554-2204910950-1522900112-1000\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 3 IoCs

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

discovery

Internet Connection Discovery

T1016.001

flow	ioc
1	api.ipify.org
1	icanhazip.com
2	api.ipify.org

Hide Artifacts: Hidden Files and Directories 1 TTPs 1 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
5644	cmd.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 5920 set thread context of 4600	5920	prevhost.exe	117
PID 5920 set thread context of 5212	5920	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
1960	powershell.exe
1960	powershell.exe
3592	powershell.exe
3592	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
2488	powershell.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5388	powershell.exe
5388	powershell.exe
5388	powershell.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe
5920	prevhost.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
2488	powershell.exe
2488	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1960	powershell.exe
Token: SeDebugPrivilege	3592	powershell.exe
Token: SeDebugPrivilege	2488	powershell.exe
Token: SeIncreaseQuotaPrivilege	2488	powershell.exe
Token: SeSecurityPrivilege	2488	powershell.exe
Token: SeTakeOwnershipPrivilege	2488	powershell.exe
Token: SeLoadDriverPrivilege	2488	powershell.exe
Token: SeSystemProfilePrivilege	2488	powershell.exe
Token: SeSystemtimePrivilege	2488	powershell.exe
Token: SeProfSingleProcessPrivilege	2488	powershell.exe
Token: SeIncBasePriorityPrivilege	2488	powershell.exe
Token: SeCreatePagefilePrivilege	2488	powershell.exe
Token: SeBackupPrivilege	2488	powershell.exe
Token: SeRestorePrivilege	2488	powershell.exe
Token: SeShutdownPrivilege	2488	powershell.exe
Token: SeDebugPrivilege	2488	powershell.exe
Token: SeSystemEnvironmentPrivilege	2488	powershell.exe
Token: SeRemoteShutdownPrivilege	2488	powershell.exe
Token: SeUndockPrivilege	2488	powershell.exe
Token: SeManageVolumePrivilege	2488	powershell.exe
Token: 33	2488	powershell.exe
Token: 34	2488	powershell.exe
Token: 35	2488	powershell.exe
Token: 36	2488	powershell.exe
Token: SeDebugPrivilege	5920	prevhost.exe
Token: SeIncreaseQuotaPrivilege	2488	powershell.exe
Token: SeSecurityPrivilege	2488	powershell.exe
Token: SeTakeOwnershipPrivilege	2488	powershell.exe
Token: SeLoadDriverPrivilege	2488	powershell.exe
Token: SeSystemProfilePrivilege	2488	powershell.exe
Token: SeSystemtimePrivilege	2488	powershell.exe
Token: SeProfSingleProcessPrivilege	2488	powershell.exe
Token: SeIncBasePriorityPrivilege	2488	powershell.exe
Token: SeCreatePagefilePrivilege	2488	powershell.exe
Token: SeBackupPrivilege	2488	powershell.exe
Token: SeRestorePrivilege	2488	powershell.exe
Token: SeShutdownPrivilege	2488	powershell.exe
Token: SeDebugPrivilege	2488	powershell.exe
Token: SeSystemEnvironmentPrivilege	2488	powershell.exe
Token: SeRemoteShutdownPrivilege	2488	powershell.exe
Token: SeUndockPrivilege	2488	powershell.exe
Token: SeManageVolumePrivilege	2488	powershell.exe
Token: 33	2488	powershell.exe
Token: 34	2488	powershell.exe
Token: 35	2488	powershell.exe
Token: 36	2488	powershell.exe
Token: SeIncreaseQuotaPrivilege	2488	powershell.exe
Token: SeSecurityPrivilege	2488	powershell.exe
Token: SeTakeOwnershipPrivilege	2488	powershell.exe
Token: SeLoadDriverPrivilege	2488	powershell.exe
Token: SeSystemProfilePrivilege	2488	powershell.exe
Token: SeSystemtimePrivilege	2488	powershell.exe
Token: SeProfSingleProcessPrivilege	2488	powershell.exe
Token: SeIncBasePriorityPrivilege	2488	powershell.exe
Token: SeCreatePagefilePrivilege	2488	powershell.exe
Token: SeBackupPrivilege	2488	powershell.exe
Token: SeRestorePrivilege	2488	powershell.exe
Token: SeShutdownPrivilege	2488	powershell.exe
Token: SeDebugPrivilege	2488	powershell.exe
Token: SeSystemEnvironmentPrivilege	2488	powershell.exe
Token: SeRemoteShutdownPrivilege	2488	powershell.exe
Token: SeUndockPrivilege	2488	powershell.exe
Token: SeManageVolumePrivilege	2488	powershell.exe
Token: 33	2488	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2636	msiexec.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 1372 wrote to memory of 1960	1372	wscript.exe	89
PID 1372 wrote to memory of 5644	1372	wscript.exe	91
PID 5644 wrote to memory of 3592	5644	cmd.exe	93
PID 5644 wrote to memory of 5912	5644	cmd.exe	94
PID 5644 wrote to memory of 1152	5644	cmd.exe	95
PID 5644 wrote to memory of 4832	5644	cmd.exe	96
PID 5644 wrote to memory of 1720	5644	cmd.exe	97
PID 5644 wrote to memory of 4992	5644	cmd.exe	98
PID 5644 wrote to memory of 2072	5644	cmd.exe	99
PID 5644 wrote to memory of 236	5644	cmd.exe	100
PID 5644 wrote to memory of 5416	5644	cmd.exe	101
PID 5644 wrote to memory of 2488	5644	cmd.exe	102
PID 5644 wrote to memory of 3328	5644	cmd.exe	104
PID 2488 wrote to memory of 916	2488	powershell.exe	106
PID 916 wrote to memory of 2604	916	csc.exe	107
PID 2488 wrote to memory of 4876	2488	powershell.exe	108
PID 4876 wrote to memory of 3432	4876	csc.exe	109
PID 2488 wrote to memory of 2636	2488	powershell.exe	110
PID 2488 wrote to memory of 2960	2488	powershell.exe	111
PID 2636 wrote to memory of 5920	2636	msiexec.exe	112
PID 2636 wrote to memory of 5920	2636	msiexec.exe	112
PID 2636 wrote to memory of 5920	2636	msiexec.exe	112
PID 5920 wrote to memory of 5388	5920	prevhost.exe	113
PID 5920 wrote to memory of 4600	5920	prevhost.exe	117
PID 5920 wrote to memory of 4600	5920	prevhost.exe	117
PID 5920 wrote to memory of 4600	5920	prevhost.exe	117
PID 5920 wrote to memory of 4600	5920	prevhost.exe	117
PID 5920 wrote to memory of 4600	5920	prevhost.exe	117
PID 5920 wrote to memory of 4600	5920	prevhost.exe	117
PID 5920 wrote to memory of 4600	5920	prevhost.exe	117
PID 5920 wrote to memory of 4600	5920	prevhost.exe	117
PID 5920 wrote to memory of 5212	5920	prevhost.exe	120
PID 5920 wrote to memory of 5212	5920	prevhost.exe	120
PID 5920 wrote to memory of 5212	5920	prevhost.exe	120
PID 5920 wrote to memory of 5212	5920	prevhost.exe	120
PID 5920 wrote to memory of 5212	5920	prevhost.exe	120
PID 5920 wrote to memory of 5212	5920	prevhost.exe	120
PID 5920 wrote to memory of 5212	5920	prevhost.exe	120
PID 5920 wrote to memory of 5212	5920	prevhost.exe	120

Views/modifies file attributes 1 TTPs 9 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
5912	attrib.exe
1152	attrib.exe
4832	attrib.exe
1720	attrib.exe
4992	attrib.exe
2072	attrib.exe
5416	attrib.exe
3328	attrib.exe
236	attrib.exe

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3989226554-2204910950-1522900112-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	prevhost.exe

C:\Windows\system32\wscript.exe
wscript.exe "C:\Users\Admin\AppData\Local\Temp\SOA&INVOICE_ NO.1010826.js"
1⤵
- Suspicious use of WriteProcessMemory
PID:1372
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -command $SBZXCHY=$env:YUFF;$SDIB=$env:OZZPTNV;$WIHOUKW=$env:EGLQ+$env:TPOKVR+$env:JAFPTVX+'.'+$env:SRTBR;[void][IO.Directory]::CreateDirectory([IO.Path]::GetDirectoryName($WIHOUKW));$PQWRIOWW=foreach($VMSB in [IO.File]::ReadAllLines($SDIB)){if($VMSB.IndexOf($SBZXCHY)-eq 0){$VMSB.Substring($SBZXCHY.Length)}};[IO.File]::WriteAllLines($WIHOUKW,[string[]]@($PQWRIOWW),[Text.Encoding]::ASCII)
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1960
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c call "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\20267261787730695836.cmd" & attrib +h +s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\20267261787730695836.cmd"
  2⤵
  - Hide Artifacts: Hidden Files and Directories
  - Suspicious use of WriteProcessMemory
  PID:5644
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -WindowStyle Hidden -Command "&($executioncontext.InvokeCommand.NewScriptBlock([string]$env:DAIPAS))"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3592
- - C:\Windows\system32\attrib.exe
    attrib -h -s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\*.cmd"
    3⤵
    - Views/modifies file attributes
    PID:5912
- - C:\Windows\system32\attrib.exe
    attrib -h -s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\*.bat"
    3⤵
    - Views/modifies file attributes
    PID:1152
- - C:\Windows\system32\attrib.exe
    attrib -h -s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\wlan_opt\wlan_opt.dat"
    3⤵
    - Views/modifies file attributes
    PID:4832
- - C:\Windows\system32\attrib.exe
    attrib -h -s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\wlan_opt\wlan_opt_BTUKSEDY.cmd"
    3⤵
    - Views/modifies file attributes
    PID:1720
- - C:\Windows\system32\attrib.exe
    attrib +h +s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\wlan_opt\wlan_opt.dat"
    3⤵
    - Views/modifies file attributes
    PID:4992
- - C:\Windows\system32\attrib.exe
    attrib +h +s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\wlan_opt\wlan_opt_BTUKSEDY.cmd"
    3⤵
    - Views/modifies file attributes
    PID:2072
- - C:\Windows\system32\attrib.exe
    attrib +h +s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\wlan_opt"
    3⤵
    - Views/modifies file attributes
    PID:236
- - C:\Windows\system32\attrib.exe
    attrib +h +s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\20267261787730695836.cmd"
    3⤵
    - Views/modifies file attributes
    PID:5416
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -Command "&($executioncontext.InvokeCommand.NewScriptBlock([string]$env:DAIPAS))"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2488
  - - 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\lh24ooso\lh24ooso.cmdline"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:916
    - - 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\RESE229.tmp" "c:\Users\Admin\AppData\Local\Temp\lh24ooso\CSC28E7F9AF3F794B3BB1DA9ED9938C098.TMP"
        5⤵
        
        PID:2604
  - - 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\55xakptm\55xakptm.cmdline"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4876
    - - 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\RESE380.tmp" "c:\Users\Admin\AppData\Local\Temp\55xakptm\CSC92AA6711F6C24B5889582F79364D7E2.TMP"
        5⤵
        
        PID:3432
  - - C:\Windows\system32\msiexec.exe
      "C:\Windows\system32\msiexec.exe"
      4⤵
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2636
    - - 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:5920
      - 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:5388
      - C:\Windows\System32\rundll32.exe
        
        "C:\Windows\System32\rundll32.exe" all -k --output-path "C:\Users\Admin\AppData\Local\Temp\b3e867b2ccbf84e081f3ed2e48a9b2c3"
        6⤵
        
        PID:4600
      - C:\Windows\System32\rundll32.exe
        
        "C:\Windows\System32\rundll32.exe" all -k --output-path "C:\Users\Admin\AppData\Local\Temp\b3e867b2ccbf84e081f3ed2e48a9b2c3"
        6⤵
        
        PID:5212
  - - C:\Windows\system32\choice.exe
      "C:\Windows\system32\choice.exe"
      4⤵
      PID:2960
- - C:\Windows\system32\attrib.exe
    attrib +h +s "C:\Users\Admin\AppData\Local\Microsoft\Windows\Caches\20267261787730695836.cmd"
    3⤵
    - Views/modifies file attributes
    PID:3328

C:\Users\Admin\AppData\Roaming\prevhost.exe
C:\Users\Admin\AppData\Roaming\prevhost.exe
1⤵
- Executes dropped EXE
PID:4892

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:3376

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