remcos | a72d8b61eaf5eb63dbf71fd2fdb64d2f51c0f9c9381ffff75c0aea44fafb6693

Analysis

max time kernel
149s
max time network
119s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
26-09-2024 07:54

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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
2156	powershell.exe
1724	powershell.exe

Executes dropped EXE 3 IoCs

pid	Process
1756	remcos.exe
1248	remcos.exe
1236	remcos.exe

Loads dropped DLL 1 IoCs

pid	Process
2520	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-1-5-21-312935884-697965778-3955649944-1000\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
Set value (str)	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\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

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3064 set thread context of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 1756 set thread context of 1236	1756	remcos.exe	42

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	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
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

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
2772	schtasks.exe
288	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3064	TNT invoice 9.26.2024 .exe
3064	TNT invoice 9.26.2024 .exe
2156	powershell.exe
1756	remcos.exe
1756	remcos.exe
1724	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	3064	TNT invoice 9.26.2024 .exe
Token: SeDebugPrivilege	2156	powershell.exe
Token: SeDebugPrivilege	1756	remcos.exe
Token: SeDebugPrivilege	1724	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1236	remcos.exe

Suspicious use of WriteProcessMemory 54 IoCs

description	pid	Process	procid_target
PID 3064 wrote to memory of 2156	3064	TNT invoice 9.26.2024 .exe	30
PID 3064 wrote to memory of 2156	3064	TNT invoice 9.26.2024 .exe	30
PID 3064 wrote to memory of 2156	3064	TNT invoice 9.26.2024 .exe	30
PID 3064 wrote to memory of 2156	3064	TNT invoice 9.26.2024 .exe	30
PID 3064 wrote to memory of 2772	3064	TNT invoice 9.26.2024 .exe	32
PID 3064 wrote to memory of 2772	3064	TNT invoice 9.26.2024 .exe	32
PID 3064 wrote to memory of 2772	3064	TNT invoice 9.26.2024 .exe	32
PID 3064 wrote to memory of 2772	3064	TNT invoice 9.26.2024 .exe	32
PID 3064 wrote to memory of 2572	3064	TNT invoice 9.26.2024 .exe	34
PID 3064 wrote to memory of 2572	3064	TNT invoice 9.26.2024 .exe	34
PID 3064 wrote to memory of 2572	3064	TNT invoice 9.26.2024 .exe	34
PID 3064 wrote to memory of 2572	3064	TNT invoice 9.26.2024 .exe	34
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 3064 wrote to memory of 2520	3064	TNT invoice 9.26.2024 .exe	35
PID 2520 wrote to memory of 1756	2520	TNT invoice 9.26.2024 .exe	36
PID 2520 wrote to memory of 1756	2520	TNT invoice 9.26.2024 .exe	36
PID 2520 wrote to memory of 1756	2520	TNT invoice 9.26.2024 .exe	36
PID 2520 wrote to memory of 1756	2520	TNT invoice 9.26.2024 .exe	36
PID 1756 wrote to memory of 1724	1756	remcos.exe	37
PID 1756 wrote to memory of 1724	1756	remcos.exe	37
PID 1756 wrote to memory of 1724	1756	remcos.exe	37
PID 1756 wrote to memory of 1724	1756	remcos.exe	37
PID 1756 wrote to memory of 288	1756	remcos.exe	38
PID 1756 wrote to memory of 288	1756	remcos.exe	38
PID 1756 wrote to memory of 288	1756	remcos.exe	38
PID 1756 wrote to memory of 288	1756	remcos.exe	38
PID 1756 wrote to memory of 1248	1756	remcos.exe	41
PID 1756 wrote to memory of 1248	1756	remcos.exe	41
PID 1756 wrote to memory of 1248	1756	remcos.exe	41
PID 1756 wrote to memory of 1248	1756	remcos.exe	41
PID 1756 wrote to memory of 1236	1756	remcos.exe	42
PID 1756 wrote to memory of 1236	1756	remcos.exe	42
PID 1756 wrote to memory of 1236	1756	remcos.exe	42
PID 1756 wrote to memory of 1236	1756	remcos.exe	42
PID 1756 wrote to memory of 1236	1756	remcos.exe	42
PID 1756 wrote to memory of 1236	1756	remcos.exe	42
PID 1756 wrote to memory of 1236	1756	remcos.exe	42
PID 1756 wrote to memory of 1236	1756	remcos.exe	42
PID 1756 wrote to memory of 1236	1756	remcos.exe	42
PID 1756 wrote to memory of 1236	1756	remcos.exe	42
PID 1756 wrote to memory of 1236	1756	remcos.exe	42
PID 1756 wrote to memory of 1236	1756	remcos.exe	42
PID 1756 wrote to memory of 1236	1756	remcos.exe	42

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 behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3064
- 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:2156
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\GLFzLcBn" /XML "C:\Users\Admin\AppData\Local\Temp\tmp316C.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2772
- 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⤵
  PID:2572
- 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:2520
- - 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 behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1756
  - - 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:1724
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\GLFzLcBn" /XML "C:\Users\Admin\AppData\Local\Temp\tmp6307.tmp"
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:288
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      PID:1248
  - - 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:1236

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
5a2208e9632a82338b9cda1ecdead121

SHA1
e69a7d4af869b1d1fa1758ba5fb9fb89c372c6ac

SHA256
897455e7ccf5ed0a97b0b3e429b57ab8cb799e97ac79517a26da36bc292ebbd8

SHA512
f7bab373d814a9550cb01aba3310561ebbced036bc9ea070c5d60f32ed808089c68d8dba2cea6f4e830f7068dcade1baf80de946abce5a65b70abb735eec829c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp316C.tmp

Filesize
1KB

MD5
101ed88f727c8b19d4dc5af96c290297

SHA1
3aea33dd9af6b3118d7b09884c7fae226e8438f0

SHA256
aa8267a13c36cfae43ac16641d2daf0665b40c0239bdf41905e40f9cac7eecae

SHA512
012399bfd7d439a5431f83219deabbb93e0d789ef8c65becfbfb117854348ab22c021c0cb8dbc2cd7796a4c0e58d2f5e3618fef630535e36dc0ad031e5b9895c

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

Filesize
7KB

MD5
9fa46e1891c6503aad8cf45551715623

SHA1
995536572eeec490c26f864e5f3e6f259e500905

SHA256
a48b63e5613da9d124acb450c78218fe132f6420aba9e36f9dceac13ae6e013e

SHA512
338f9771e1c00ba8ff171b37665b82d7afe8f0b4059b659abd11db696c56fd59d015b8653a69980e6043741b0c3126e8d2ecdb49480b778e0ee4c73d6ec1ca12

Download Submit
\ProgramData\Remcos\remcos.exe

Filesize
881KB

MD5
7afd5be4b77090388ddecb8169cf0bc3

SHA1
d3b6ba2e53aed1471c12196c577b7be56d14cf2f

SHA256
68a4b0d743c427d59d076376e5c3a131ee7ab29cdc959b8872735c06b70b7036

SHA512
2f16fce3f75bce88c79286f41010d76691fe0fab37c4fad814867b819c60c81fe4dff17ad722952cc6c7a7d99aaec75d51d2fd16350babb8d3388e11d2236a06

Download Submit
memory/1236-64-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1236-65-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1236-69-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1236-61-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1756-41-0x00000000010F0000-0x00000000011D2000-memory.dmp

Filesize
904KB

Download
memory/2520-30-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2520-26-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2520-16-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2520-22-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2520-24-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2520-31-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2520-32-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2520-28-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2520-20-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2520-18-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2520-14-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3064-1-0x00000000011F0000-0x00000000012D2000-memory.dmp

Filesize
904KB

Download
memory/3064-0-0x00000000743AE000-0x00000000743AF000-memory.dmp

Filesize
4KB

Download
memory/3064-6-0x0000000005770000-0x0000000005830000-memory.dmp

Filesize
768KB

Download
memory/3064-5-0x00000000743A0000-0x0000000074A8E000-memory.dmp

Filesize
6.9MB

Download
memory/3064-4-0x00000000743AE000-0x00000000743AF000-memory.dmp

Filesize
4KB

Download
memory/3064-3-0x0000000000B60000-0x0000000000B70000-memory.dmp

Filesize
64KB

Download
memory/3064-2-0x00000000743A0000-0x0000000074A8E000-memory.dmp

Filesize
6.9MB

Download
memory/3064-33-0x00000000743A0000-0x0000000074A8E000-memory.dmp

Filesize
6.9MB

Download