remcos | c791f1b7d5778fe52f16e07a66769b5ead35245824f7dcf00bcb7b493aa635cd

Analysis

max time kernel
150s
max time network
150s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
09-09-2024 22:35

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General

Target

TNT invoice.exe
Size

883KB
MD5

054306ece8b6f161c94e7cb68d8bd9e6
SHA1

5b49d309162f9308baa6aa4e85931c85ec3eb909
SHA256

f9f95960ec195d7f883e4b3d5d75c26cd9f7dc7fbe8eef76d493ab6cc149e898
SHA512

f1ee8d8f986ef4e5b30ac8f9b262243e93cade9267b3c024d2b5787d6c5bc87b8eadb5200c5f65959f969c57b735b2446093b8891da066042cd413f489e62ca6
SSDEEP

24576:paUd4rdMqIdKWA5RUzENN1UcrZT216UHSF698lLUE7zvkE:TyrdlUzEjxZT2HIlLk

Score

10^/10

remcos irn discovery execution persistence rat spyware stealer

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
2904	powershell.exe
2968	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
2748	remcos.exe
2956	remcos.exe

Loads dropped DLL 2 IoCs

pid	Process
2832	TNT invoice.exe
2832	TNT invoice.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

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\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	TNT invoice.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	TNT invoice.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3434294380-2554721341-1919518612-1000\Software\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 1952 set thread context of 2832	1952	TNT invoice.exe	35
PID 2748 set thread context of 2956	2748	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	TNT invoice.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	TNT invoice.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
2284	schtasks.exe
2868	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1952	TNT invoice.exe
1952	TNT invoice.exe
2904	powershell.exe
2748	remcos.exe
2748	remcos.exe
2968	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1952	TNT invoice.exe
Token: SeDebugPrivilege	2904	powershell.exe
Token: SeDebugPrivilege	2748	remcos.exe
Token: SeDebugPrivilege	2968	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2956	remcos.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 1952 wrote to memory of 2904	1952	TNT invoice.exe	31
PID 1952 wrote to memory of 2904	1952	TNT invoice.exe	31
PID 1952 wrote to memory of 2904	1952	TNT invoice.exe	31
PID 1952 wrote to memory of 2904	1952	TNT invoice.exe	31
PID 1952 wrote to memory of 2284	1952	TNT invoice.exe	33
PID 1952 wrote to memory of 2284	1952	TNT invoice.exe	33
PID 1952 wrote to memory of 2284	1952	TNT invoice.exe	33
PID 1952 wrote to memory of 2284	1952	TNT invoice.exe	33
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 1952 wrote to memory of 2832	1952	TNT invoice.exe	35
PID 2832 wrote to memory of 2748	2832	TNT invoice.exe	36
PID 2832 wrote to memory of 2748	2832	TNT invoice.exe	36
PID 2832 wrote to memory of 2748	2832	TNT invoice.exe	36
PID 2832 wrote to memory of 2748	2832	TNT invoice.exe	36
PID 2748 wrote to memory of 2968	2748	remcos.exe	37
PID 2748 wrote to memory of 2968	2748	remcos.exe	37
PID 2748 wrote to memory of 2968	2748	remcos.exe	37
PID 2748 wrote to memory of 2968	2748	remcos.exe	37
PID 2748 wrote to memory of 2868	2748	remcos.exe	39
PID 2748 wrote to memory of 2868	2748	remcos.exe	39
PID 2748 wrote to memory of 2868	2748	remcos.exe	39
PID 2748 wrote to memory of 2868	2748	remcos.exe	39
PID 2748 wrote to memory of 2956	2748	remcos.exe	41
PID 2748 wrote to memory of 2956	2748	remcos.exe	41
PID 2748 wrote to memory of 2956	2748	remcos.exe	41
PID 2748 wrote to memory of 2956	2748	remcos.exe	41
PID 2748 wrote to memory of 2956	2748	remcos.exe	41
PID 2748 wrote to memory of 2956	2748	remcos.exe	41
PID 2748 wrote to memory of 2956	2748	remcos.exe	41
PID 2748 wrote to memory of 2956	2748	remcos.exe	41
PID 2748 wrote to memory of 2956	2748	remcos.exe	41
PID 2748 wrote to memory of 2956	2748	remcos.exe	41
PID 2748 wrote to memory of 2956	2748	remcos.exe	41
PID 2748 wrote to memory of 2956	2748	remcos.exe	41
PID 2748 wrote to memory of 2956	2748	remcos.exe	41

C:\Users\Admin\AppData\Local\Temp\TNT invoice.exe
"C:\Users\Admin\AppData\Local\Temp\TNT invoice.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1952
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\osuEcT.exe"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2904
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\osuEcT" /XML "C:\Users\Admin\AppData\Local\Temp\tmpF8A1.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2284
- C:\Users\Admin\AppData\Local\Temp\TNT invoice.exe
  "C:\Users\Admin\AppData\Local\Temp\TNT invoice.exe"
  2⤵
  - Loads dropped DLL
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2832
- - 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:2748
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\osuEcT.exe"
      4⤵
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2968
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\osuEcT" /XML "C:\Users\Admin\AppData\Local\Temp\tmp2BE1.tmp"
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:2868
  - - 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:2956

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

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\Remcos\logs.dat

Filesize
144B

MD5
2696baf2e8875bf3156fdc6080435322

SHA1
5dd8560380897fd40fc1ee0027e4defd4f4f7c99

SHA256
95d7deec9dcc266d1f241bc8ffe38678d1fcf532a4446fb4699d011ab813e797

SHA512
2589fe2355d6668f092474694deaaf7e6491d0d2e593f9ddba805a4e157b98453140c86aa16f322a4ee27603f59222e24e9d7e05064802b1fb27c9ddb1d6fb66

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpF8A1.tmp

Filesize
1KB

MD5
57d623cbf04bb16f2356185a9d37a43c

SHA1
0742d392aecd55e9790a2db0c74bc5e89a1ad287

SHA256
4f1960b5331619d8b306d092a8d5ef61928b8556641bcd9ab502c8c5ef68b2e6

SHA512
763518463155947eb59d53c1b92d48942b507148b280472359ae0682cfad09d4d0409bf9bd00e951f66bc80db84ed736ba0b4da0e0052abb1b7c7c4f19672971

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

Filesize
7KB

MD5
23b57d4cbac5fb2ea14bd1b5418aab49

SHA1
ef382e765c45b8966926770141cf11a067b40930

SHA256
16b0c30f66042da9e0985e5a2f3aa610af85b5bb2afadf81a2de5909ff2b19e0

SHA512
af53002bf9ab04ec98651893df189bc297b299c7bccd706fc2fb2ac9da0d2bcc4101b8cc2c7d86aea0e8989027fab66a29d20bda6467f231f657997e280f3452

Download Submit
\ProgramData\Remcos\remcos.exe

Filesize
883KB

MD5
054306ece8b6f161c94e7cb68d8bd9e6

SHA1
5b49d309162f9308baa6aa4e85931c85ec3eb909

SHA256
f9f95960ec195d7f883e4b3d5d75c26cd9f7dc7fbe8eef76d493ab6cc149e898

SHA512
f1ee8d8f986ef4e5b30ac8f9b262243e93cade9267b3c024d2b5787d6c5bc87b8eadb5200c5f65959f969c57b735b2446093b8891da066042cd413f489e62ca6

Download Submit
memory/1952-6-0x0000000005570000-0x0000000005630000-memory.dmp

Filesize
768KB

Download
memory/1952-5-0x0000000074C90000-0x000000007537E000-memory.dmp

Filesize
6.9MB

Download
memory/1952-35-0x0000000074C90000-0x000000007537E000-memory.dmp

Filesize
6.9MB

Download
memory/1952-4-0x0000000074C9E000-0x0000000074C9F000-memory.dmp

Filesize
4KB

Download
memory/1952-3-0x00000000003A0000-0x00000000003B0000-memory.dmp

Filesize
64KB

Download
memory/1952-0-0x0000000074C9E000-0x0000000074C9F000-memory.dmp

Filesize
4KB

Download
memory/1952-2-0x0000000074C90000-0x000000007537E000-memory.dmp

Filesize
6.9MB

Download
memory/1952-1-0x00000000009F0000-0x0000000000AD2000-memory.dmp

Filesize
904KB

Download
memory/2748-44-0x0000000000FC0000-0x00000000010A2000-memory.dmp

Filesize
904KB

Download
memory/2832-28-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2832-22-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2832-20-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2832-18-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2832-26-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2832-17-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2832-14-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2832-29-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2832-30-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2832-12-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2832-24-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-63-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2956-71-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-68-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-76-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-77-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-78-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-79-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-80-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-81-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-82-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-84-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-87-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-88-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-90-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-91-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-67-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-98-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-99-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-107-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-106-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-114-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-115-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download