remcos | e75a4696986efc34b686c88acbb183396fa22b765623d026c3d272be87c57650

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions	RTM09878GH.exe

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
2288	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	RTM09878GH.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\VideoBiosVersion	RTM09878GH.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	RTM09878GH.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	RTM09878GH.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RTM09878GH.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	RTM09878GH.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	RTM09878GH.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2524 set thread context of 2876	2524	RTM09878GH.exe	35

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 1 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	iexplore.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2288	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2288	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2876	iexplore.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 2524 wrote to memory of 2288	2524	RTM09878GH.exe	32
PID 2524 wrote to memory of 2288	2524	RTM09878GH.exe	32
PID 2524 wrote to memory of 2288	2524	RTM09878GH.exe	32
PID 2524 wrote to memory of 2724	2524	RTM09878GH.exe	34
PID 2524 wrote to memory of 2724	2524	RTM09878GH.exe	34
PID 2524 wrote to memory of 2724	2524	RTM09878GH.exe	34
PID 2524 wrote to memory of 2724	2524	RTM09878GH.exe	34
PID 2524 wrote to memory of 2724	2524	RTM09878GH.exe	34
PID 2524 wrote to memory of 2724	2524	RTM09878GH.exe	34
PID 2524 wrote to memory of 2724	2524	RTM09878GH.exe	34
PID 2524 wrote to memory of 2724	2524	RTM09878GH.exe	34
PID 2524 wrote to memory of 2724	2524	RTM09878GH.exe	34
PID 2524 wrote to memory of 2876	2524	RTM09878GH.exe	35
PID 2524 wrote to memory of 2876	2524	RTM09878GH.exe	35
PID 2524 wrote to memory of 2876	2524	RTM09878GH.exe	35
PID 2524 wrote to memory of 2876	2524	RTM09878GH.exe	35
PID 2524 wrote to memory of 2876	2524	RTM09878GH.exe	35
PID 2524 wrote to memory of 2876	2524	RTM09878GH.exe	35
PID 2524 wrote to memory of 2876	2524	RTM09878GH.exe	35
PID 2524 wrote to memory of 2876	2524	RTM09878GH.exe	35
PID 2524 wrote to memory of 2876	2524	RTM09878GH.exe	35
PID 2524 wrote to memory of 2876	2524	RTM09878GH.exe	35
PID 2524 wrote to memory of 2876	2524	RTM09878GH.exe	35
PID 2524 wrote to memory of 2840	2524	RTM09878GH.exe	36
PID 2524 wrote to memory of 2840	2524	RTM09878GH.exe	36
PID 2524 wrote to memory of 2840	2524	RTM09878GH.exe	36

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RTM09878GH.exe

C:\Users\Admin\AppData\Local\Temp\RTM09878GH.exe
"C:\Users\Admin\AppData\Local\Temp\RTM09878GH.exe"
1⤵
- UAC bypass
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2524
- 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\RTM09878GH.exe" -Force
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2288
- C:\Windows\System32\calc.exe
  "C:\Windows\System32\calc.exe"
  2⤵
  PID:2724
- C:\Program Files (x86)\Internet Explorer\iexplore.exe
  "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:2876
- C:\Windows\system32\WerFault.exe
  C:\Windows\system32\WerFault.exe -u -p 2524 -s 900
  2⤵
  PID:2840

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

2

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

4

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion

2