remcos | 8154dcd3b9aa77539b16ed4b113c7739357c26a7e5961ea7747aa45bcc285bdc

Analysis

max time kernel
118s
max time network
119s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
10-09-2024 04:39

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General

Target

TNT invoice.exe
Size

962KB
MD5

36a61907068929b0cea9cfad4bb45b5f
SHA1

564d7d74f94fe07b5590a6c17b0caad3536c61c6
SHA256

b041b54fdd8bac5ca781c5b064235a29cc29480edb623a216a2a3d8aef71ea16
SHA512

6e3f7cc4d0995c7937049cde030f983ca0d80afdf08dfa3defb14a6778349ae8296ee950407f5f0a1e42eb32122aa8a9b104a40a4f7171fd2c6c162896e2fc1d
SSDEEP

24576:OkGY2eTMCq/oDIALSR7mD60noFfzE5BG:PAeTw/oDnWoD6GoBE5E

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
2664	powershell.exe
1736	powershell.exe

Executes dropped EXE 6 IoCs

pid	Process
1508	remcos.exe
2724	remcos.exe
2840	remcos.exe
2848	remcos.exe
2844	remcos.exe
316	remcos.exe

Loads dropped DLL 2 IoCs

pid	Process
2752	TNT invoice.exe
2752	TNT invoice.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-1-5-21-2872745919-2748461613-2989606286-1000\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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2068 set thread context of 2752	2068	TNT invoice.exe	34

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.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.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

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
2756	schtasks.exe
1724	schtasks.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
2068	TNT invoice.exe
2068	TNT invoice.exe
2664	powershell.exe
1508	remcos.exe
1508	remcos.exe
1508	remcos.exe
1508	remcos.exe
1508	remcos.exe
1508	remcos.exe
1508	remcos.exe
1736	powershell.exe
1508	remcos.exe
1508	remcos.exe
1508	remcos.exe
1508	remcos.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2068	TNT invoice.exe
Token: SeDebugPrivilege	2664	powershell.exe
Token: SeDebugPrivilege	1508	remcos.exe
Token: SeDebugPrivilege	1736	powershell.exe

Suspicious use of WriteProcessMemory 53 IoCs

description	pid	Process	procid_target
PID 2068 wrote to memory of 2664	2068	TNT invoice.exe	30
PID 2068 wrote to memory of 2664	2068	TNT invoice.exe	30
PID 2068 wrote to memory of 2664	2068	TNT invoice.exe	30
PID 2068 wrote to memory of 2664	2068	TNT invoice.exe	30
PID 2068 wrote to memory of 2756	2068	TNT invoice.exe	32
PID 2068 wrote to memory of 2756	2068	TNT invoice.exe	32
PID 2068 wrote to memory of 2756	2068	TNT invoice.exe	32
PID 2068 wrote to memory of 2756	2068	TNT invoice.exe	32
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2068 wrote to memory of 2752	2068	TNT invoice.exe	34
PID 2752 wrote to memory of 1508	2752	TNT invoice.exe	35
PID 2752 wrote to memory of 1508	2752	TNT invoice.exe	35
PID 2752 wrote to memory of 1508	2752	TNT invoice.exe	35
PID 2752 wrote to memory of 1508	2752	TNT invoice.exe	35
PID 1508 wrote to memory of 1736	1508	remcos.exe	36
PID 1508 wrote to memory of 1736	1508	remcos.exe	36
PID 1508 wrote to memory of 1736	1508	remcos.exe	36
PID 1508 wrote to memory of 1736	1508	remcos.exe	36
PID 1508 wrote to memory of 1724	1508	remcos.exe	38
PID 1508 wrote to memory of 1724	1508	remcos.exe	38
PID 1508 wrote to memory of 1724	1508	remcos.exe	38
PID 1508 wrote to memory of 1724	1508	remcos.exe	38
PID 1508 wrote to memory of 2724	1508	remcos.exe	40
PID 1508 wrote to memory of 2724	1508	remcos.exe	40
PID 1508 wrote to memory of 2724	1508	remcos.exe	40
PID 1508 wrote to memory of 2724	1508	remcos.exe	40
PID 1508 wrote to memory of 2840	1508	remcos.exe	41
PID 1508 wrote to memory of 2840	1508	remcos.exe	41
PID 1508 wrote to memory of 2840	1508	remcos.exe	41
PID 1508 wrote to memory of 2840	1508	remcos.exe	41
PID 1508 wrote to memory of 2848	1508	remcos.exe	42
PID 1508 wrote to memory of 2848	1508	remcos.exe	42
PID 1508 wrote to memory of 2848	1508	remcos.exe	42
PID 1508 wrote to memory of 2848	1508	remcos.exe	42
PID 1508 wrote to memory of 2844	1508	remcos.exe	43
PID 1508 wrote to memory of 2844	1508	remcos.exe	43
PID 1508 wrote to memory of 2844	1508	remcos.exe	43
PID 1508 wrote to memory of 2844	1508	remcos.exe	43
PID 1508 wrote to memory of 316	1508	remcos.exe	44
PID 1508 wrote to memory of 316	1508	remcos.exe	44
PID 1508 wrote to memory of 316	1508	remcos.exe	44
PID 1508 wrote to memory of 316	1508	remcos.exe	44

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: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\GpYKIf.exe"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2664
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\GpYKIf" /XML "C:\Users\Admin\AppData\Local\Temp\tmp30C1.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2756
- 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:2752
- - 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:1508
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\GpYKIf.exe"
      4⤵
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1736
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\GpYKIf" /XML "C:\Users\Admin\AppData\Local\Temp\tmp61BF.tmp"
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:1724
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      PID:2724
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      PID:2840
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      PID:2848
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      PID:2844
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      PID:316

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

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Downloads

C:\ProgramData\Remcos\remcos.exe

Filesize
962KB

MD5
36a61907068929b0cea9cfad4bb45b5f

SHA1
564d7d74f94fe07b5590a6c17b0caad3536c61c6

SHA256
b041b54fdd8bac5ca781c5b064235a29cc29480edb623a216a2a3d8aef71ea16

SHA512
6e3f7cc4d0995c7937049cde030f983ca0d80afdf08dfa3defb14a6778349ae8296ee950407f5f0a1e42eb32122aa8a9b104a40a4f7171fd2c6c162896e2fc1d

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp30C1.tmp

Filesize
1KB

MD5
2d59b05e979c2073206aecb4eddfbd6d

SHA1
11e4e43fc2886756d3b96748b1f9ffb94c7c9558

SHA256
38d4f83209a4a744b3bdf9fdc3d70c42c9df5469d4e9e4f600d837e6053d1260

SHA512
448f309fe263ee882e891b3581ef9a20989c92ee3a2ea1e945091cee9fb2b9ace71d86f12d1534de81c85e2ec7b7a7dc60dd72ac8843dfb64bc7b9c80b03f828

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

Filesize
7KB

MD5
68616efd289ee6bf2be84c914cac7293

SHA1
a423205f28e1b13351f02f62c018a2434f55ab02

SHA256
cd684b66516687d0a90e8e3f58d28ba5d80ad984360462c11657deb3ec58a64e

SHA512
e93791683b451ea01370eba44301a68449c9d457f7d962f29144911000e1566fc8afd98e3667b7d5a0decff664b7fd23c036490250e4aaa03a33f5657a94e475

Download Submit
memory/1508-43-0x0000000000350000-0x0000000000446000-memory.dmp

Filesize
984KB

Download
memory/2068-1-0x0000000000DB0000-0x0000000000EA6000-memory.dmp

Filesize
984KB

Download
memory/2068-2-0x0000000074970000-0x000000007505E000-memory.dmp

Filesize
6.9MB

Download
memory/2068-3-0x0000000000740000-0x0000000000750000-memory.dmp

Filesize
64KB

Download
memory/2068-4-0x000000007497E000-0x000000007497F000-memory.dmp

Filesize
4KB

Download
memory/2068-5-0x0000000074970000-0x000000007505E000-memory.dmp

Filesize
6.9MB

Download
memory/2068-6-0x0000000005330000-0x00000000053F0000-memory.dmp

Filesize
768KB

Download
memory/2068-44-0x0000000074970000-0x000000007505E000-memory.dmp

Filesize
6.9MB

Download
memory/2068-0-0x000000007497E000-0x000000007497F000-memory.dmp

Filesize
4KB

Download
memory/2752-31-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2752-28-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2752-24-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2752-22-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2752-20-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2752-18-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2752-16-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2752-30-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2752-32-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2752-26-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2752-14-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download