remcos | 639927d618b812cfd77638461dee8462d16ee991a5d46fea9eef76cc014a2872

Bypass User Account Control

T1548.002

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RFQ_000000000000034094.exe

Windows security bypass 2 TTPs 2 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	RFQ_000000000000034094.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\RFQ_000000000000034094.exe = "0"	RFQ_000000000000034094.exe

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral4/memory/4540-41-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 1 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral4/memory/5988-44-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral4/memory/316-43-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral4/memory/4540-41-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral4/memory/5988-44-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
5416	powershell.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-1-5-21-2447855248-390457009-3660902674-1000\Control Panel\International\Geo\Nation	RFQ_000000000000034094.exe

Windows security modification 2 TTPs 3 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\RFQ_000000000000034094.exe = "0"	RFQ_000000000000034094.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	RFQ_000000000000034094.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	RFQ_000000000000034094.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2447855248-390457009-3660902674-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	ngen.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

T1082

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RFQ_000000000000034094.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	RFQ_000000000000034094.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 3672 set thread context of 5344	3672	RFQ_000000000000034094.exe	86
PID 5344 set thread context of 5988	5344	ngen.exe	92
PID 5344 set thread context of 4540	5344	ngen.exe	93
PID 5344 set thread context of 316	5344	ngen.exe	94

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
5416	powershell.exe
5416	powershell.exe
5988	ngen.exe
5988	ngen.exe
5988	ngen.exe
5988	ngen.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
5344	ngen.exe
5344	ngen.exe
5344	ngen.exe
5344	ngen.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5416	powershell.exe
Token: SeDebugPrivilege	316	ngen.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5344	ngen.exe

Suspicious use of WriteProcessMemory 32 IoCs

description	pid	Process	procid_target
PID 3672 wrote to memory of 5416	3672	RFQ_000000000000034094.exe	84
PID 3672 wrote to memory of 5416	3672	RFQ_000000000000034094.exe	84
PID 3672 wrote to memory of 5344	3672	RFQ_000000000000034094.exe	86
PID 3672 wrote to memory of 5344	3672	RFQ_000000000000034094.exe	86
PID 3672 wrote to memory of 5344	3672	RFQ_000000000000034094.exe	86
PID 3672 wrote to memory of 5344	3672	RFQ_000000000000034094.exe	86
PID 3672 wrote to memory of 5344	3672	RFQ_000000000000034094.exe	86
PID 3672 wrote to memory of 5344	3672	RFQ_000000000000034094.exe	86
PID 3672 wrote to memory of 5344	3672	RFQ_000000000000034094.exe	86
PID 3672 wrote to memory of 5344	3672	RFQ_000000000000034094.exe	86
PID 3672 wrote to memory of 5344	3672	RFQ_000000000000034094.exe	86
PID 3672 wrote to memory of 5344	3672	RFQ_000000000000034094.exe	86
PID 3672 wrote to memory of 5344	3672	RFQ_000000000000034094.exe	86
PID 3672 wrote to memory of 5344	3672	RFQ_000000000000034094.exe	86
PID 3672 wrote to memory of 1268	3672	RFQ_000000000000034094.exe	87
PID 3672 wrote to memory of 1268	3672	RFQ_000000000000034094.exe	87
PID 3672 wrote to memory of 1268	3672	RFQ_000000000000034094.exe	87
PID 5344 wrote to memory of 5924	5344	ngen.exe	91
PID 5344 wrote to memory of 5924	5344	ngen.exe	91
PID 5344 wrote to memory of 5924	5344	ngen.exe	91
PID 5344 wrote to memory of 5988	5344	ngen.exe	92
PID 5344 wrote to memory of 5988	5344	ngen.exe	92
PID 5344 wrote to memory of 5988	5344	ngen.exe	92
PID 5344 wrote to memory of 5988	5344	ngen.exe	92
PID 5344 wrote to memory of 4540	5344	ngen.exe	93
PID 5344 wrote to memory of 4540	5344	ngen.exe	93
PID 5344 wrote to memory of 4540	5344	ngen.exe	93
PID 5344 wrote to memory of 4540	5344	ngen.exe	93
PID 5344 wrote to memory of 316	5344	ngen.exe	94
PID 5344 wrote to memory of 316	5344	ngen.exe	94
PID 5344 wrote to memory of 316	5344	ngen.exe	94
PID 5344 wrote to memory of 316	5344	ngen.exe	94

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RFQ_000000000000034094.exe

C:\Users\Admin\AppData\Local\Temp\RFQ_000000000000034094.exe
"C:\Users\Admin\AppData\Local\Temp\RFQ_000000000000034094.exe"
1⤵
- UAC bypass
- Windows security bypass
- Checks computer location settings
- Windows security modification
- Checks whether UAC is enabled
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
- System policy modification
PID:3672
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\RFQ_000000000000034094.exe" -Force
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:5416
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5344
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe /stext "C:\Users\Admin\AppData\Local\Temp\ehbcpugekvjavcbtgfzmawatzzobxkk"
    3⤵
    PID:5924
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe /stext "C:\Users\Admin\AppData\Local\Temp\ehbcpugekvjavcbtgfzmawatzzobxkk"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:5988
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe /stext "C:\Users\Admin\AppData\Local\Temp\hcgnpnryydbfgixxxpmnljnkzffkqvbkta"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:4540
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe /stext "C:\Users\Admin\AppData\Local\Temp\rwtfif"
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:316
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
  2⤵
  PID:1268

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry