remcos | 45df1e9a2808d2e4fb67b308af593ebb3637078ef7bc86eb4cb7f37dd45b20b7

Analysis

max time kernel
121s
max time network
122s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
16-09-2024 06:57

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General

Target

TNT INVOICE 9.16.2024.exe
Size

874KB
MD5

fa85476ee938c50ec297a18b6d84ad2d
SHA1

24687b69c21fdcc298fbc977548fcd34f1e7d8ee
SHA256

4dd5c06062753a3522e3a1bb4a10d29639b467599913a27d77af2866dd095a32
SHA512

7a486263b9de67d94b7d90c2e60c285cceaa8bfa0fb825b6aee6eafe753178316bf051b877ee797509becf59617246cea5cbcba2804fbb7f1252248508121758
SSDEEP

24576:OEqKo59aqP71pME/qVt4G0PWxxtO6rO69qCVJFOxGoF:OE38bPQRVatPAA6rO6Fb

Score

10^/10

remcos irn discovery execution persistence rat

Malware Config

Extracted

Family

remcos

Botnet

IRN

irnserv1.ddns.net:4424

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
true
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-CA8761
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

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

execution

PowerShell

T1059.001

pid	Process
2660	powershell.exe
1976	powershell.exe

Executes dropped EXE 6 IoCs

pid	Process
536	remcos.exe
784	remcos.exe
1912	remcos.exe
1768	remcos.exe
2472	remcos.exe
1124	remcos.exe

Loads dropped DLL 2 IoCs

pid	Process
2776	TNT INVOICE 9.16.2024.exe
2776	TNT INVOICE 9.16.2024.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	TNT INVOICE 9.16.2024.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	TNT INVOICE 9.16.2024.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2272 set thread context of 2776	2272	TNT INVOICE 9.16.2024.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 7 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	TNT INVOICE 9.16.2024.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	TNT INVOICE 9.16.2024.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2656	schtasks.exe
580	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
2660	powershell.exe
536	remcos.exe
536	remcos.exe
536	remcos.exe
536	remcos.exe
536	remcos.exe
536	remcos.exe
536	remcos.exe
536	remcos.exe
536	remcos.exe
536	remcos.exe
1976	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2660	powershell.exe
Token: SeDebugPrivilege	536	remcos.exe
Token: SeDebugPrivilege	1976	powershell.exe

Suspicious use of WriteProcessMemory 53 IoCs

description	pid	Process	procid_target
PID 2272 wrote to memory of 2660	2272	TNT INVOICE 9.16.2024.exe	31
PID 2272 wrote to memory of 2660	2272	TNT INVOICE 9.16.2024.exe	31
PID 2272 wrote to memory of 2660	2272	TNT INVOICE 9.16.2024.exe	31
PID 2272 wrote to memory of 2660	2272	TNT INVOICE 9.16.2024.exe	31
PID 2272 wrote to memory of 2656	2272	TNT INVOICE 9.16.2024.exe	33
PID 2272 wrote to memory of 2656	2272	TNT INVOICE 9.16.2024.exe	33
PID 2272 wrote to memory of 2656	2272	TNT INVOICE 9.16.2024.exe	33
PID 2272 wrote to memory of 2656	2272	TNT INVOICE 9.16.2024.exe	33
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2272 wrote to memory of 2776	2272	TNT INVOICE 9.16.2024.exe	35
PID 2776 wrote to memory of 536	2776	TNT INVOICE 9.16.2024.exe	36
PID 2776 wrote to memory of 536	2776	TNT INVOICE 9.16.2024.exe	36
PID 2776 wrote to memory of 536	2776	TNT INVOICE 9.16.2024.exe	36
PID 2776 wrote to memory of 536	2776	TNT INVOICE 9.16.2024.exe	36
PID 536 wrote to memory of 1976	536	remcos.exe	37
PID 536 wrote to memory of 1976	536	remcos.exe	37
PID 536 wrote to memory of 1976	536	remcos.exe	37
PID 536 wrote to memory of 1976	536	remcos.exe	37
PID 536 wrote to memory of 580	536	remcos.exe	38
PID 536 wrote to memory of 580	536	remcos.exe	38
PID 536 wrote to memory of 580	536	remcos.exe	38
PID 536 wrote to memory of 580	536	remcos.exe	38
PID 536 wrote to memory of 784	536	remcos.exe	41
PID 536 wrote to memory of 784	536	remcos.exe	41
PID 536 wrote to memory of 784	536	remcos.exe	41
PID 536 wrote to memory of 784	536	remcos.exe	41
PID 536 wrote to memory of 1768	536	remcos.exe	42
PID 536 wrote to memory of 1768	536	remcos.exe	42
PID 536 wrote to memory of 1768	536	remcos.exe	42
PID 536 wrote to memory of 1768	536	remcos.exe	42
PID 536 wrote to memory of 1912	536	remcos.exe	43
PID 536 wrote to memory of 1912	536	remcos.exe	43
PID 536 wrote to memory of 1912	536	remcos.exe	43
PID 536 wrote to memory of 1912	536	remcos.exe	43
PID 536 wrote to memory of 1124	536	remcos.exe	44
PID 536 wrote to memory of 1124	536	remcos.exe	44
PID 536 wrote to memory of 1124	536	remcos.exe	44
PID 536 wrote to memory of 1124	536	remcos.exe	44
PID 536 wrote to memory of 2472	536	remcos.exe	45
PID 536 wrote to memory of 2472	536	remcos.exe	45
PID 536 wrote to memory of 2472	536	remcos.exe	45
PID 536 wrote to memory of 2472	536	remcos.exe	45

C:\Users\Admin\AppData\Local\Temp\TNT INVOICE 9.16.2024.exe
"C:\Users\Admin\AppData\Local\Temp\TNT INVOICE 9.16.2024.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2272
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\fiCAFOzLq.exe"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2660
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\fiCAFOzLq" /XML "C:\Users\Admin\AppData\Local\Temp\tmpDE6.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2656
- C:\Users\Admin\AppData\Local\Temp\TNT INVOICE 9.16.2024.exe
  "C:\Users\Admin\AppData\Local\Temp\TNT INVOICE 9.16.2024.exe"
  2⤵
  - Loads dropped DLL
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2776
- - C:\ProgramData\Remcos\remcos.exe
    "C:\ProgramData\Remcos\remcos.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:536
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\fiCAFOzLq.exe"
      4⤵
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1976
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\fiCAFOzLq" /XML "C:\Users\Admin\AppData\Local\Temp\tmp4144.tmp"
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:580
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      PID:784
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      PID:1768
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      PID:1912
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      PID:1124
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      PID:2472

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpDE6.tmp

Filesize
1KB

MD5
c7363930d83275b663e422330d5af3bd

SHA1
167756baae80d440b4e83db018bbe3722d603234

SHA256
c021c1d5962cef72482755406f2b803572b8eac238a3997422edd7e193ae195c

SHA512
787c920d4fc1da0c5c86a96380454ab8cdca504140018e18669cc85a6f346d6f87b853a3ba3e4c69e55111ab927ce42fdbccc75578a013e8a4784b60475a67ea

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms

Filesize
7KB

MD5
0c3d2463388d25812e4f5aebd642e1f2

SHA1
44224a5528c0d418d4cca61f45fde83cfff8a5ce

SHA256
c8eb09b38095ce5f098dc5ffd08b848af87ee8f1dbab67c2799d9870bea4abb2

SHA512
58ce293b8628b590f900b91238c69f841505c45cc2b455e7188ef2a7e1de50f9b1574c82b5db1a511e84b30e5b408377a5dd650454409a519b0db76b372aea40

Download Submit
\ProgramData\Remcos\remcos.exe

Filesize
874KB

MD5
fa85476ee938c50ec297a18b6d84ad2d

SHA1
24687b69c21fdcc298fbc977548fcd34f1e7d8ee

SHA256
4dd5c06062753a3522e3a1bb4a10d29639b467599913a27d77af2866dd095a32

SHA512
7a486263b9de67d94b7d90c2e60c285cceaa8bfa0fb825b6aee6eafe753178316bf051b877ee797509becf59617246cea5cbcba2804fbb7f1252248508121758

Download Submit
memory/536-45-0x0000000000380000-0x0000000000460000-memory.dmp

Filesize
896KB

Download
memory/2272-3-0x0000000004E20000-0x0000000004EF4000-memory.dmp

Filesize
848KB

Download
memory/2272-6-0x0000000074E60000-0x000000007554E000-memory.dmp

Filesize
6.9MB

Download
memory/2272-7-0x0000000005360000-0x0000000005420000-memory.dmp

Filesize
768KB

Download
memory/2272-5-0x0000000074E6E000-0x0000000074E6F000-memory.dmp

Filesize
4KB

Download
memory/2272-4-0x00000000005B0000-0x00000000005BE000-memory.dmp

Filesize
56KB

Download
memory/2272-36-0x0000000074E60000-0x000000007554E000-memory.dmp

Filesize
6.9MB

Download
memory/2272-2-0x0000000074E60000-0x000000007554E000-memory.dmp

Filesize
6.9MB

Download
memory/2272-0-0x0000000074E6E000-0x0000000074E6F000-memory.dmp

Filesize
4KB

Download
memory/2272-1-0x0000000001060000-0x0000000001140000-memory.dmp

Filesize
896KB

Download
memory/2776-32-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2776-23-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2776-21-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2776-19-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2776-25-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2776-27-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2776-29-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2776-17-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2776-33-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2776-31-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2776-15-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download