remcos | 2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
remcos

Checks computer location settings 2 TTPs 6 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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	Dxpserver.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	Dxpserver.exe

Executes dropped EXE 4 IoCs

pid	Process
4172	Dxpserver.exe
1852	Dxpserver.exe
4336	Dxpserver.exe
3068	Dxpserver.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Dxpserver.exe

Modifies WinLogon 2 TTPs 3 IoCs

persistence

Winlogon Helper DLL

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	Dxpserver.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	Dxpserver.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe

AutoIT Executable 1 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral2/files/0x000a000000023b9b-15.dat	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3136 set thread context of 5064	3136	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	84
PID 4172 set thread context of 1852	4172	Dxpserver.exe	106
PID 4336 set thread context of 3068	4336	Dxpserver.exe	113

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 12 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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Dxpserver.exe

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000_Classes\Local Settings	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe
Key created	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000_Classes\Local Settings	Dxpserver.exe
Key created	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000_Classes\Local Settings	Dxpserver.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
3488	schtasks.exe
1292	schtasks.exe
5104	schtasks.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 3136 wrote to memory of 5064	3136	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	84
PID 3136 wrote to memory of 5064	3136	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	84
PID 3136 wrote to memory of 5064	3136	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	84
PID 3136 wrote to memory of 5064	3136	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	84
PID 3136 wrote to memory of 5064	3136	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	84
PID 5064 wrote to memory of 3560	5064	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	85
PID 5064 wrote to memory of 3560	5064	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	85
PID 5064 wrote to memory of 3560	5064	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	85
PID 3136 wrote to memory of 3488	3136	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	100
PID 3136 wrote to memory of 3488	3136	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	100
PID 3136 wrote to memory of 3488	3136	2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe	100
PID 4172 wrote to memory of 1852	4172	Dxpserver.exe	106
PID 4172 wrote to memory of 1852	4172	Dxpserver.exe	106
PID 4172 wrote to memory of 1852	4172	Dxpserver.exe	106
PID 4172 wrote to memory of 1852	4172	Dxpserver.exe	106
PID 4172 wrote to memory of 1852	4172	Dxpserver.exe	106
PID 1852 wrote to memory of 840	1852	Dxpserver.exe	107
PID 1852 wrote to memory of 840	1852	Dxpserver.exe	107
PID 1852 wrote to memory of 840	1852	Dxpserver.exe	107
PID 4172 wrote to memory of 1292	4172	Dxpserver.exe	110
PID 4172 wrote to memory of 1292	4172	Dxpserver.exe	110
PID 4172 wrote to memory of 1292	4172	Dxpserver.exe	110
PID 4336 wrote to memory of 3068	4336	Dxpserver.exe	113
PID 4336 wrote to memory of 3068	4336	Dxpserver.exe	113
PID 4336 wrote to memory of 3068	4336	Dxpserver.exe	113
PID 4336 wrote to memory of 3068	4336	Dxpserver.exe	113
PID 4336 wrote to memory of 3068	4336	Dxpserver.exe	113
PID 3068 wrote to memory of 4596	3068	Dxpserver.exe	114
PID 3068 wrote to memory of 4596	3068	Dxpserver.exe	114
PID 3068 wrote to memory of 4596	3068	Dxpserver.exe	114
PID 4336 wrote to memory of 5104	4336	Dxpserver.exe	116
PID 4336 wrote to memory of 5104	4336	Dxpserver.exe	116
PID 4336 wrote to memory of 5104	4336	Dxpserver.exe	116

C:\Users\Admin\AppData\Local\Temp\2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe
"C:\Users\Admin\AppData\Local\Temp\2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3136
- C:\Users\Admin\AppData\Local\Temp\2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe
  "C:\Users\Admin\AppData\Local\Temp\2c9e0f36dceb0c4a806dc23512747ee70a487fce3ad4a38474ea31f321e0f438.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Checks computer location settings
  - Adds Run key to start application
  - Modifies WinLogon
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:5064
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3560
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\SysWOW64\schtasks.exe" /create /tn cttunesvr /tr "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe" /sc minute /mo 1 /F
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:3488

C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4172
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Checks computer location settings
  - Executes dropped EXE
  - Adds Run key to start application
  - Modifies WinLogon
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:1852
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:840
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\SysWOW64\schtasks.exe" /create /tn cttunesvr /tr "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe" /sc minute /mo 1 /F
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:1292

C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4336
- C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe
  "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Checks computer location settings
  - Executes dropped EXE
  - Adds Run key to start application
  - Modifies WinLogon
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:3068
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4596
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\SysWOW64\schtasks.exe" /create /tn cttunesvr /tr "C:\Users\Admin\AppData\Roaming\adprovider\Dxpserver.exe" /sc minute /mo 1 /F
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:5104

Network

DNS

8.8.8.8.in-addr.arpa

Remote address:

8.8.8.8:53

Request

8.8.8.8.in-addr.arpa

IN PTR

Response

8.8.8.8.in-addr.arpa

IN PTR

dnsgoogle
DNS

28.118.140.52.in-addr.arpa

Remote address:

8.8.8.8:53

Request

28.118.140.52.in-addr.arpa

IN PTR

Response
DNS

172.210.232.199.in-addr.arpa

Remote address:

8.8.8.8:53

Request

172.210.232.199.in-addr.arpa

IN PTR

Response
DNS

2.159.190.20.in-addr.arpa

Remote address:

8.8.8.8:53

Request

2.159.190.20.in-addr.arpa

IN PTR

Response
DNS

7.98.51.23.in-addr.arpa

Remote address:

8.8.8.8:53

Request

7.98.51.23.in-addr.arpa

IN PTR

Response

7.98.51.23.in-addr.arpa

IN PTR

a23-51-98-7deploystaticakamaitechnologiescom
DNS

133.211.185.52.in-addr.arpa

Remote address:

8.8.8.8:53

Request

133.211.185.52.in-addr.arpa

IN PTR

Response
DNS

97.17.167.52.in-addr.arpa

Remote address:

8.8.8.8:53

Request

97.17.167.52.in-addr.arpa

IN PTR

Response
DNS

53.210.109.20.in-addr.arpa

Remote address:

8.8.8.8:53

Request

53.210.109.20.in-addr.arpa

IN PTR

Response
DNS

206.23.85.13.in-addr.arpa

Remote address:

8.8.8.8:53

Request

206.23.85.13.in-addr.arpa

IN PTR

Response
DNS

86.49.80.91.in-addr.arpa

Remote address:

8.8.8.8:53

Request

86.49.80.91.in-addr.arpa

IN PTR

Response
DNS

21.49.80.91.in-addr.arpa

Remote address:

8.8.8.8:53

Request

21.49.80.91.in-addr.arpa

IN PTR

Response
DNS

22.49.80.91.in-addr.arpa

Remote address:

8.8.8.8:53

Request

22.49.80.91.in-addr.arpa

IN PTR

Response
DNS

13.227.111.52.in-addr.arpa

Remote address:

8.8.8.8:53

Request

13.227.111.52.in-addr.arpa

IN PTR

Response

No results found

8.8.8.8:53

8.8.8.8.in-addr.arpa

dns

66 B
90 B
1
1

DNS Request

8.8.8.8.in-addr.arpa
8.8.8.8:53

28.118.140.52.in-addr.arpa

dns

72 B
158 B
1
1

DNS Request

28.118.140.52.in-addr.arpa
8.8.8.8:53

172.210.232.199.in-addr.arpa

dns

74 B
128 B
1
1

DNS Request

172.210.232.199.in-addr.arpa
8.8.8.8:53

2.159.190.20.in-addr.arpa

dns

71 B
157 B
1
1

DNS Request

2.159.190.20.in-addr.arpa
8.8.8.8:53

7.98.51.23.in-addr.arpa

dns

69 B
131 B
1
1

DNS Request

7.98.51.23.in-addr.arpa
8.8.8.8:53

133.211.185.52.in-addr.arpa

dns

73 B
147 B
1
1

DNS Request

133.211.185.52.in-addr.arpa
8.8.8.8:53

97.17.167.52.in-addr.arpa

dns

71 B
145 B
1
1

DNS Request

97.17.167.52.in-addr.arpa
8.8.8.8:53

53.210.109.20.in-addr.arpa

dns

72 B
158 B
1
1

DNS Request

53.210.109.20.in-addr.arpa
8.8.8.8:53

206.23.85.13.in-addr.arpa

dns

71 B
145 B
1
1

DNS Request

206.23.85.13.in-addr.arpa
8.8.8.8:53

86.49.80.91.in-addr.arpa

dns

70 B
145 B
1
1

DNS Request

86.49.80.91.in-addr.arpa
8.8.8.8:53

21.49.80.91.in-addr.arpa

dns

70 B
145 B
1
1

DNS Request

21.49.80.91.in-addr.arpa
8.8.8.8:53

22.49.80.91.in-addr.arpa

dns

70 B
145 B
1
1

DNS Request

22.49.80.91.in-addr.arpa
8.8.8.8:53

13.227.111.52.in-addr.arpa

dns

72 B
158 B
1
1

DNS Request

13.227.111.52.in-addr.arpa

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Modify Registry