remcos | 7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b

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"	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.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	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe = "0"	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe

Detected Nirsoft tools 3 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral2/memory/4092-43-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1728-41-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/984-40-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft

Looks for VirtualBox Guest Additions in registry 2 TTPs 1 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/984-40-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 1 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/1728-41-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

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
2444	powershell.exe

Looks for VMWare Tools registry key 2 TTPs 1 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

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

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe

Uses the VBS compiler for execution 1 TTPs

Command and Scripting Interpreter
T1059

Windows security modification 2 TTPs 3 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe = "0"	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe

Maps connected drives based on registry 3 TTPs 2 IoCs

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

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 1668 set thread context of 5104	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	88
PID 5104 set thread context of 1728	5104	vbc.exe	92
PID 5104 set thread context of 984	5104	vbc.exe	93
PID 5104 set thread context of 4092	5104	vbc.exe	94

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 4 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	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2444	powershell.exe
2444	powershell.exe
1728	vbc.exe
1728	vbc.exe
4092	vbc.exe
4092	vbc.exe
1728	vbc.exe
1728	vbc.exe

Suspicious behavior: MapViewOfSection 3 IoCs

pid	Process
5104	vbc.exe
5104	vbc.exe
5104	vbc.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2444	powershell.exe
Token: SeDebugPrivilege	4092	vbc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5104	vbc.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1668 wrote to memory of 2444	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	86
PID 1668 wrote to memory of 2444	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	86
PID 1668 wrote to memory of 5104	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	88
PID 1668 wrote to memory of 5104	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	88
PID 1668 wrote to memory of 5104	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	88
PID 1668 wrote to memory of 5104	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	88
PID 1668 wrote to memory of 5104	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	88
PID 1668 wrote to memory of 5104	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	88
PID 1668 wrote to memory of 5104	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	88
PID 1668 wrote to memory of 5104	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	88
PID 1668 wrote to memory of 5104	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	88
PID 1668 wrote to memory of 5104	1668	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe	88
PID 5104 wrote to memory of 1728	5104	vbc.exe	92
PID 5104 wrote to memory of 1728	5104	vbc.exe	92
PID 5104 wrote to memory of 1728	5104	vbc.exe	92
PID 5104 wrote to memory of 1728	5104	vbc.exe	92
PID 5104 wrote to memory of 984	5104	vbc.exe	93
PID 5104 wrote to memory of 984	5104	vbc.exe	93
PID 5104 wrote to memory of 984	5104	vbc.exe	93
PID 5104 wrote to memory of 984	5104	vbc.exe	93
PID 5104 wrote to memory of 4092	5104	vbc.exe	94
PID 5104 wrote to memory of 4092	5104	vbc.exe	94
PID 5104 wrote to memory of 4092	5104	vbc.exe	94
PID 5104 wrote to memory of 4092	5104	vbc.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"	7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe

C:\Users\Admin\AppData\Local\Temp\7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe
"C:\Users\Admin\AppData\Local\Temp\7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe"
1⤵
- UAC bypass
- Windows security bypass
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Checks computer location settings
- Windows security modification
- Checks whether UAC is enabled
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1668
- 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\7053c8d9983dc949e5d559ba1b006b8ba9c059a23e06cd87c857c3d04201381b.exe" -Force
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2444
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5104
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe /stext "C:\Users\Admin\AppData\Local\Temp\mbwsjprcyhqmgkgbdyeovzhenkausnzjzd"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:1728
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe /stext "C:\Users\Admin\AppData\Local\Temp\ovkkkhc"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:984
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe /stext "C:\Users\Admin\AppData\Local\Temp\yxpdksmxax"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4092

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

Virtualization/Sandbox Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

System Information Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion