remcos | 68a4b0d743c427d59d076376e5c3a131ee7ab29cdc959b8872735c06b70b7036

Resubmissions

09-01-2025 18:14

250109-wvn5tsypak 10

26-09-2024 07:17

240926-h4renaxbrg 10

Analysis

max time kernel
150s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
26-09-2024 07:17

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General

Target

TNT invoice 9.26.2024 .exe
Size

881KB
MD5

7afd5be4b77090388ddecb8169cf0bc3
SHA1

d3b6ba2e53aed1471c12196c577b7be56d14cf2f
SHA256

68a4b0d743c427d59d076376e5c3a131ee7ab29cdc959b8872735c06b70b7036
SHA512

2f16fce3f75bce88c79286f41010d76691fe0fab37c4fad814867b819c60c81fe4dff17ad722952cc6c7a7d99aaec75d51d2fd16350babb8d3388e11d2236a06
SSDEEP

24576:VE8AE9lxicGLP0CDyB/1FNlUcDos713jb:VExsxiTVe1F/UcDosVb

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
2344	powershell.exe
1232	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
2616	remcos.exe
1652	remcos.exe

Loads dropped DLL 1 IoCs

pid	Process
2884	TNT invoice 9.26.2024 .exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	TNT invoice 9.26.2024 .exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	TNT invoice 9.26.2024 .exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	remcos.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2068 set thread context of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2616 set thread context of 1652	2616	remcos.exe	41

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 8 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	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	TNT invoice 9.26.2024 .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 9.26.2024 .exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.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
2760	schtasks.exe
852	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2344	powershell.exe
1232	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2344	powershell.exe
Token: SeDebugPrivilege	1232	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1652	remcos.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 2068 wrote to memory of 2344	2068	TNT invoice 9.26.2024 .exe	31
PID 2068 wrote to memory of 2344	2068	TNT invoice 9.26.2024 .exe	31
PID 2068 wrote to memory of 2344	2068	TNT invoice 9.26.2024 .exe	31
PID 2068 wrote to memory of 2344	2068	TNT invoice 9.26.2024 .exe	31
PID 2068 wrote to memory of 2760	2068	TNT invoice 9.26.2024 .exe	32
PID 2068 wrote to memory of 2760	2068	TNT invoice 9.26.2024 .exe	32
PID 2068 wrote to memory of 2760	2068	TNT invoice 9.26.2024 .exe	32
PID 2068 wrote to memory of 2760	2068	TNT invoice 9.26.2024 .exe	32
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2068 wrote to memory of 2884	2068	TNT invoice 9.26.2024 .exe	35
PID 2884 wrote to memory of 2616	2884	TNT invoice 9.26.2024 .exe	36
PID 2884 wrote to memory of 2616	2884	TNT invoice 9.26.2024 .exe	36
PID 2884 wrote to memory of 2616	2884	TNT invoice 9.26.2024 .exe	36
PID 2884 wrote to memory of 2616	2884	TNT invoice 9.26.2024 .exe	36
PID 2616 wrote to memory of 1232	2616	remcos.exe	37
PID 2616 wrote to memory of 1232	2616	remcos.exe	37
PID 2616 wrote to memory of 1232	2616	remcos.exe	37
PID 2616 wrote to memory of 1232	2616	remcos.exe	37
PID 2616 wrote to memory of 852	2616	remcos.exe	39
PID 2616 wrote to memory of 852	2616	remcos.exe	39
PID 2616 wrote to memory of 852	2616	remcos.exe	39
PID 2616 wrote to memory of 852	2616	remcos.exe	39
PID 2616 wrote to memory of 1652	2616	remcos.exe	41
PID 2616 wrote to memory of 1652	2616	remcos.exe	41
PID 2616 wrote to memory of 1652	2616	remcos.exe	41
PID 2616 wrote to memory of 1652	2616	remcos.exe	41
PID 2616 wrote to memory of 1652	2616	remcos.exe	41
PID 2616 wrote to memory of 1652	2616	remcos.exe	41
PID 2616 wrote to memory of 1652	2616	remcos.exe	41
PID 2616 wrote to memory of 1652	2616	remcos.exe	41
PID 2616 wrote to memory of 1652	2616	remcos.exe	41
PID 2616 wrote to memory of 1652	2616	remcos.exe	41
PID 2616 wrote to memory of 1652	2616	remcos.exe	41
PID 2616 wrote to memory of 1652	2616	remcos.exe	41
PID 2616 wrote to memory of 1652	2616	remcos.exe	41

C:\Users\Admin\AppData\Local\Temp\TNT invoice 9.26.2024 .exe
"C:\Users\Admin\AppData\Local\Temp\TNT invoice 9.26.2024 .exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2068
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\GLFzLcBn.exe"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2344
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\GLFzLcBn" /XML "C:\Users\Admin\AppData\Local\Temp\tmpCB6A.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2760
- C:\Users\Admin\AppData\Local\Temp\TNT invoice 9.26.2024 .exe
  "C:\Users\Admin\AppData\Local\Temp\TNT invoice 9.26.2024 .exe"
  2⤵
  - Loads dropped DLL
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2884
- - C:\ProgramData\Remcos\remcos.exe
    "C:\ProgramData\Remcos\remcos.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2616
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\GLFzLcBn.exe"
      4⤵
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1232
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\GLFzLcBn" /XML "C:\Users\Admin\AppData\Local\Temp\tmpFE3C.tmp"
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:852
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      Suspicious use of SetWindowsHookEx
      PID:1652

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:\ProgramData\Remcos\logs.dat

Filesize
144B

MD5
03546fd32293e43d7f789a3841084106

SHA1
f9ab1aba44a482109be14b9a78fc0b1c22eebf59

SHA256
00050af0eda86c3945b798be8565cb75281dbb74d962ab99b61739f13492273f

SHA512
0282f3820f3037f9ddaaa7cbcd35dbf0d13142983d7901256451889ee7aaeec9c20db8064bd95092fff7fac9ebb7530264c4fca110f67c580751ca39df69cdd1

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpCB6A.tmp

Filesize
1KB

MD5
71c4b886409389bc525c0b95daa4a795

SHA1
891686ef0aa878c94e5505d1a5c0f500a83cf09a

SHA256
307c103e7e68ae1722128d01c55dbdc6ae3b3241f49b525fc72b1771f90a0a0a

SHA512
d825f7b93c9938fd4fd9535338441394ebd531703b609e6c4ec182ec289fe561a43436a996c96d0ced8b51c5887e2e4dafbfeec127e4704b392e3f49aadf9df5

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

Filesize
7KB

MD5
ed29a16311c83c796a5edef5dbf52416

SHA1
98380af2995f9ebdff98da20896f2f9e82a83c29

SHA256
4a80806c2e11f9ca35acb81c0b2f3508c9947ca574aafb7060557c50dcaf4862

SHA512
8528b761b73832c04608316650bbbc97b63bd75c83350b3b37942841603feeacb3a8251a3c38750909831f6917584b91094c125b2df73994f9bc33e2f8308627

Download Submit
\ProgramData\Remcos\remcos.exe

Filesize
881KB

MD5
7afd5be4b77090388ddecb8169cf0bc3

SHA1
d3b6ba2e53aed1471c12196c577b7be56d14cf2f

SHA256
68a4b0d743c427d59d076376e5c3a131ee7ab29cdc959b8872735c06b70b7036

SHA512
2f16fce3f75bce88c79286f41010d76691fe0fab37c4fad814867b819c60c81fe4dff17ad722952cc6c7a7d99aaec75d51d2fd16350babb8d3388e11d2236a06

Download Submit
memory/1652-70-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1652-66-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1652-69-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1652-73-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2068-6-0x0000000004F90000-0x0000000005050000-memory.dmp

Filesize
768KB

Download
memory/2068-5-0x00000000740C0000-0x00000000747AE000-memory.dmp

Filesize
6.9MB

Download
memory/2068-4-0x00000000740CE000-0x00000000740CF000-memory.dmp

Filesize
4KB

Download
memory/2068-33-0x00000000740C0000-0x00000000747AE000-memory.dmp

Filesize
6.9MB

Download
memory/2068-3-0x0000000000390000-0x00000000003A0000-memory.dmp

Filesize
64KB

Download
memory/2068-2-0x00000000740C0000-0x00000000747AE000-memory.dmp

Filesize
6.9MB

Download
memory/2068-1-0x0000000000850000-0x0000000000932000-memory.dmp

Filesize
904KB

Download
memory/2068-0-0x00000000740CE000-0x00000000740CF000-memory.dmp

Filesize
4KB

Download
memory/2616-41-0x0000000000EA0000-0x0000000000F82000-memory.dmp

Filesize
904KB

Download
memory/2884-18-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2884-28-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2884-20-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2884-22-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2884-24-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2884-26-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2884-30-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2884-31-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2884-32-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2884-16-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2884-14-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download