remcos | a77754ef6de4a61024e443178b88e50be8b1994f87b323ed7fa5f2f197acdab4

Analysis

max time kernel
149s
max time network
150s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
04/10/2024, 05:57

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General

Target

673d693b0c8b68503d64ed15fd863d61.exe
Size

1017KB
MD5

673d693b0c8b68503d64ed15fd863d61
SHA1

4fb6b11e933354b9f7c5bda096543a5d6b56ff83
SHA256

a77754ef6de4a61024e443178b88e50be8b1994f87b323ed7fa5f2f197acdab4
SHA512

3996083d6b2f207e742a81a1dd11277c1bdb2631438a0ee72eeec88a57ff39fb2a7c9a100b30bc2839519c3019129d2157e89d6ade8cc326c4073daf4cc2bd27
SSDEEP

24576:myN887MU2cPnNupjbW/5OheoofVmhGmfCtquly:myNVQUPNudihOhRdhHIqul

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
2908	powershell.exe
1672	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
2956	remcos.exe
1884	remcos.exe

Loads dropped DLL 1 IoCs

pid	Process
2836	673d693b0c8b68503d64ed15fd863d61.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\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	673d693b0c8b68503d64ed15fd863d61.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4177215427-74451935-3209572229-1000\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-1-5-21-4177215427-74451935-3209572229-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	673d693b0c8b68503d64ed15fd863d61.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2100 set thread context of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2956 set thread context of 1884	2956	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	673d693b0c8b68503d64ed15fd863d61.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	673d693b0c8b68503d64ed15fd863d61.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.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
2304	schtasks.exe
2624	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2908	powershell.exe
1672	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2908	powershell.exe
Token: SeDebugPrivilege	1672	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1884	remcos.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 2100 wrote to memory of 2908	2100	673d693b0c8b68503d64ed15fd863d61.exe	31
PID 2100 wrote to memory of 2908	2100	673d693b0c8b68503d64ed15fd863d61.exe	31
PID 2100 wrote to memory of 2908	2100	673d693b0c8b68503d64ed15fd863d61.exe	31
PID 2100 wrote to memory of 2908	2100	673d693b0c8b68503d64ed15fd863d61.exe	31
PID 2100 wrote to memory of 2304	2100	673d693b0c8b68503d64ed15fd863d61.exe	32
PID 2100 wrote to memory of 2304	2100	673d693b0c8b68503d64ed15fd863d61.exe	32
PID 2100 wrote to memory of 2304	2100	673d693b0c8b68503d64ed15fd863d61.exe	32
PID 2100 wrote to memory of 2304	2100	673d693b0c8b68503d64ed15fd863d61.exe	32
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2100 wrote to memory of 2836	2100	673d693b0c8b68503d64ed15fd863d61.exe	35
PID 2836 wrote to memory of 2956	2836	673d693b0c8b68503d64ed15fd863d61.exe	36
PID 2836 wrote to memory of 2956	2836	673d693b0c8b68503d64ed15fd863d61.exe	36
PID 2836 wrote to memory of 2956	2836	673d693b0c8b68503d64ed15fd863d61.exe	36
PID 2836 wrote to memory of 2956	2836	673d693b0c8b68503d64ed15fd863d61.exe	36
PID 2956 wrote to memory of 1672	2956	remcos.exe	37
PID 2956 wrote to memory of 1672	2956	remcos.exe	37
PID 2956 wrote to memory of 1672	2956	remcos.exe	37
PID 2956 wrote to memory of 1672	2956	remcos.exe	37
PID 2956 wrote to memory of 2624	2956	remcos.exe	39
PID 2956 wrote to memory of 2624	2956	remcos.exe	39
PID 2956 wrote to memory of 2624	2956	remcos.exe	39
PID 2956 wrote to memory of 2624	2956	remcos.exe	39
PID 2956 wrote to memory of 1884	2956	remcos.exe	41
PID 2956 wrote to memory of 1884	2956	remcos.exe	41
PID 2956 wrote to memory of 1884	2956	remcos.exe	41
PID 2956 wrote to memory of 1884	2956	remcos.exe	41
PID 2956 wrote to memory of 1884	2956	remcos.exe	41
PID 2956 wrote to memory of 1884	2956	remcos.exe	41
PID 2956 wrote to memory of 1884	2956	remcos.exe	41
PID 2956 wrote to memory of 1884	2956	remcos.exe	41
PID 2956 wrote to memory of 1884	2956	remcos.exe	41
PID 2956 wrote to memory of 1884	2956	remcos.exe	41
PID 2956 wrote to memory of 1884	2956	remcos.exe	41
PID 2956 wrote to memory of 1884	2956	remcos.exe	41
PID 2956 wrote to memory of 1884	2956	remcos.exe	41

C:\Users\Admin\AppData\Local\Temp\673d693b0c8b68503d64ed15fd863d61.exe
"C:\Users\Admin\AppData\Local\Temp\673d693b0c8b68503d64ed15fd863d61.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2100
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\mDBLQPaU.exe"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2908
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\mDBLQPaU" /XML "C:\Users\Admin\AppData\Local\Temp\tmpF6FC.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2304
- C:\Users\Admin\AppData\Local\Temp\673d693b0c8b68503d64ed15fd863d61.exe
  "C:\Users\Admin\AppData\Local\Temp\673d693b0c8b68503d64ed15fd863d61.exe"
  2⤵
  - Loads dropped DLL
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2836
- - 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:2956
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\mDBLQPaU.exe"
      4⤵
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1672
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\mDBLQPaU" /XML "C:\Users\Admin\AppData\Local\Temp\tmp29BF.tmp"
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:2624
  - - 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:1884

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
79645d2ab14862cb19639fa6f2825a17

SHA1
5e7c5864c9da1c46109fa86b96c66da885360e13

SHA256
c6970136ef111b994f3466e0cd19797ea5bb0c557d5be10cd650f7a1237c1414

SHA512
5aa49ea21650b742677c24c3ea4344a9f245b5356d0ea2c1f337de3c10e6b2e1b9d5aa0fcace9266fdee49f29f7bee55bcc1717fd5d94b02ef606a5c795ff7bf

Download Submit
C:\ProgramData\Remcos\remcos.exe

Filesize
1017KB

MD5
673d693b0c8b68503d64ed15fd863d61

SHA1
4fb6b11e933354b9f7c5bda096543a5d6b56ff83

SHA256
a77754ef6de4a61024e443178b88e50be8b1994f87b323ed7fa5f2f197acdab4

SHA512
3996083d6b2f207e742a81a1dd11277c1bdb2631438a0ee72eeec88a57ff39fb2a7c9a100b30bc2839519c3019129d2157e89d6ade8cc326c4073daf4cc2bd27

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpF6FC.tmp

Filesize
1KB

MD5
28f26ba334ede40d3a700c255838e799

SHA1
14b680f0e65251fdbdebb41a8da60d98a47e2d89

SHA256
1b8be703bc200f2f2daf9e705c84c1a9d85718d8509e008d626e023160acc586

SHA512
dd1067055bed5a1b74c47e28bea3b5c4a327be74618701717c7d091193016944deabaa010b310aec16c3a11ef31a8a9100a1c0378872ce098f8aaa98694e2d44

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

Filesize
7KB

MD5
69d84c902908bd9031078affed441859

SHA1
944b4064992684698150d26bc588f1ba326f1622

SHA256
66969e59a1019f5cdd49bf2cfdee8426feb8acebca6df6ebf3bbb0e9d8fd40e8

SHA512
271b26c2d80348f19feb01678f4b37108f833cd49cf984b2265f6d1eee7d04d3d79977d7e7b18d8171240ecded33d9a0d1df8185d7d29ced933fee4edc3094b2

Download Submit
memory/1884-83-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-76-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-86-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-100-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-85-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-98-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-82-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-81-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-97-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-96-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-94-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-93-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-66-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1884-75-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-91-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-74-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-90-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-80-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-79-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-73-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-70-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-69-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-77-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-88-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-92-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1884-87-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2100-6-0x0000000005C30000-0x0000000005CF0000-memory.dmp

Filesize
768KB

Download
memory/2100-2-0x00000000746C0000-0x0000000074DAE000-memory.dmp

Filesize
6.9MB

Download
memory/2100-3-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/2100-34-0x00000000746C0000-0x0000000074DAE000-memory.dmp

Filesize
6.9MB

Download
memory/2100-4-0x00000000746CE000-0x00000000746CF000-memory.dmp

Filesize
4KB

Download
memory/2100-0-0x00000000746CE000-0x00000000746CF000-memory.dmp

Filesize
4KB

Download
memory/2100-1-0x00000000010B0000-0x00000000011B4000-memory.dmp

Filesize
1.0MB

Download
memory/2100-5-0x00000000746C0000-0x0000000074DAE000-memory.dmp

Filesize
6.9MB

Download
memory/2836-20-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2836-29-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2836-14-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2836-16-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2836-26-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2836-30-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2836-31-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2836-32-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2836-24-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2836-22-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2836-18-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2956-41-0x0000000000B70000-0x0000000000C74000-memory.dmp

Filesize
1.0MB

Download