remcos | 68a4b0d743c427d59d076376e5c3a131ee7ab29cdc959b8872735c06b70b7036

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
26-09-2024 13:44

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General

Target

TNTinvoice9.26.2024.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
2384	powershell.exe
3440	powershell.exe

Checks computer location settings 2 TTPs 3 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-523280732-2327480845-3730041215-1000\Control Panel\International\Geo\Nation	TNTinvoice9.26.2024.exe
Key value queried	\REGISTRY\USER\S-1-5-21-523280732-2327480845-3730041215-1000\Control Panel\International\Geo\Nation	remcos.exe
Key value queried	\REGISTRY\USER\S-1-5-21-523280732-2327480845-3730041215-1000\Control Panel\International\Geo\Nation	TNTinvoice9.26.2024.exe

Executes dropped EXE 2 IoCs

pid	Process
3640	remcos.exe
880	remcos.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-1-5-21-523280732-2327480845-3730041215-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	TNTinvoice9.26.2024.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-CA8761 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	TNTinvoice9.26.2024.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-523280732-2327480845-3730041215-1000\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 4336 set thread context of 184	4336	TNTinvoice9.26.2024.exe	91
PID 3640 set thread context of 880	3640	remcos.exe	99

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	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	TNTinvoice9.26.2024.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	TNTinvoice9.26.2024.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
216	schtasks.exe
2572	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3440	powershell.exe
3440	powershell.exe
2384	powershell.exe
2384	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3440	powershell.exe
Token: SeDebugPrivilege	2384	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
880	remcos.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 4336 wrote to memory of 3440	4336	TNTinvoice9.26.2024.exe	87
PID 4336 wrote to memory of 3440	4336	TNTinvoice9.26.2024.exe	87
PID 4336 wrote to memory of 3440	4336	TNTinvoice9.26.2024.exe	87
PID 4336 wrote to memory of 216	4336	TNTinvoice9.26.2024.exe	89
PID 4336 wrote to memory of 216	4336	TNTinvoice9.26.2024.exe	89
PID 4336 wrote to memory of 216	4336	TNTinvoice9.26.2024.exe	89
PID 4336 wrote to memory of 184	4336	TNTinvoice9.26.2024.exe	91
PID 4336 wrote to memory of 184	4336	TNTinvoice9.26.2024.exe	91
PID 4336 wrote to memory of 184	4336	TNTinvoice9.26.2024.exe	91
PID 4336 wrote to memory of 184	4336	TNTinvoice9.26.2024.exe	91
PID 4336 wrote to memory of 184	4336	TNTinvoice9.26.2024.exe	91
PID 4336 wrote to memory of 184	4336	TNTinvoice9.26.2024.exe	91
PID 4336 wrote to memory of 184	4336	TNTinvoice9.26.2024.exe	91
PID 4336 wrote to memory of 184	4336	TNTinvoice9.26.2024.exe	91
PID 4336 wrote to memory of 184	4336	TNTinvoice9.26.2024.exe	91
PID 4336 wrote to memory of 184	4336	TNTinvoice9.26.2024.exe	91
PID 4336 wrote to memory of 184	4336	TNTinvoice9.26.2024.exe	91
PID 4336 wrote to memory of 184	4336	TNTinvoice9.26.2024.exe	91
PID 184 wrote to memory of 3640	184	TNTinvoice9.26.2024.exe	92
PID 184 wrote to memory of 3640	184	TNTinvoice9.26.2024.exe	92
PID 184 wrote to memory of 3640	184	TNTinvoice9.26.2024.exe	92
PID 3640 wrote to memory of 2384	3640	remcos.exe	95
PID 3640 wrote to memory of 2384	3640	remcos.exe	95
PID 3640 wrote to memory of 2384	3640	remcos.exe	95
PID 3640 wrote to memory of 2572	3640	remcos.exe	97
PID 3640 wrote to memory of 2572	3640	remcos.exe	97
PID 3640 wrote to memory of 2572	3640	remcos.exe	97
PID 3640 wrote to memory of 880	3640	remcos.exe	99
PID 3640 wrote to memory of 880	3640	remcos.exe	99
PID 3640 wrote to memory of 880	3640	remcos.exe	99
PID 3640 wrote to memory of 880	3640	remcos.exe	99
PID 3640 wrote to memory of 880	3640	remcos.exe	99
PID 3640 wrote to memory of 880	3640	remcos.exe	99
PID 3640 wrote to memory of 880	3640	remcos.exe	99
PID 3640 wrote to memory of 880	3640	remcos.exe	99
PID 3640 wrote to memory of 880	3640	remcos.exe	99
PID 3640 wrote to memory of 880	3640	remcos.exe	99
PID 3640 wrote to memory of 880	3640	remcos.exe	99
PID 3640 wrote to memory of 880	3640	remcos.exe	99

C:\Users\Admin\AppData\Local\Temp\TNTinvoice9.26.2024.exe
"C:\Users\Admin\AppData\Local\Temp\TNTinvoice9.26.2024.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4336
- 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:3440
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\GLFzLcBn" /XML "C:\Users\Admin\AppData\Local\Temp\tmpB863.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:216
- C:\Users\Admin\AppData\Local\Temp\TNTinvoice9.26.2024.exe
  "C:\Users\Admin\AppData\Local\Temp\TNTinvoice9.26.2024.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:184
- - C:\ProgramData\Remcos\remcos.exe
    "C:\ProgramData\Remcos\remcos.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3640
  - - 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:2384
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\GLFzLcBn" /XML "C:\Users\Admin\AppData\Local\Temp\tmpEE86.tmp"
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:2572
  - - 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:880

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

Query Registry

T1012

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
b8604201e8a07170c3bd79a813ff0072

SHA1
6ccae0dcb094a728451754906431475d764acd42

SHA256
ff1f5c119a8a1475c06807d409bee4b4452f8db5ce7f2981b9c6721ed2c1c4fc

SHA512
e3602b35061d23fe820f2fe077590acb77047187fdef2a780ea794d2d55507d4a1ae77640925a88f74c5fa32e6254bea15fdac642a16dd5672409d0ecf53bfd5

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

Filesize
881KB

MD5
7afd5be4b77090388ddecb8169cf0bc3

SHA1
d3b6ba2e53aed1471c12196c577b7be56d14cf2f

SHA256
68a4b0d743c427d59d076376e5c3a131ee7ab29cdc959b8872735c06b70b7036

SHA512
2f16fce3f75bce88c79286f41010d76691fe0fab37c4fad814867b819c60c81fe4dff17ad722952cc6c7a7d99aaec75d51d2fd16350babb8d3388e11d2236a06

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
968cb9309758126772781b83adb8a28f

SHA1
8da30e71accf186b2ba11da1797cf67f8f78b47c

SHA256
92099c10776bb7e3f2a8d1b82d4d40d0c4627e4f1bf754a6e58dfd2c2e97042a

SHA512
4bd50732f8af4d688d95999bddfd296115d7033ddc38f86c9fb1f47fde202bffa27e9088bebcaa3064ca946af2f5c1ca6cbde49d0907f0005c7ab42874515dd3

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
18KB

MD5
c0d92d36ba98d0b1938ae3f7abb94b95

SHA1
10675092e6946fc8e2e2eb1694d3a931ed86c461

SHA256
bb10e37f8546ae80f004e8057202798f7e5d3b39cad87e66bd8c1490127ad71e

SHA512
1e9a8cc7e485f4fa30ed0f8d00307b9f722a745e598fbdb81ddd38832e869b49eeddc89c8522e151c45f15bb8524d6c5073d276ce08b34258185581ef2e7b73a

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_5nc3u3at.42o.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB863.tmp

Filesize
1KB

MD5
8b45c9074823ce290b0d664d40d6ca1f

SHA1
667c2b16a1516f7853bdda5f7d310ff9c7ed2fb2

SHA256
532b2138a1966ca6feee61439bba5f25dcf4b9662ee1e17fa8dc60836c05149c

SHA512
cc324687632b4f465f8e47d35d31eac612e118e75465ee621968bc31c306936e37742672eb4b4640c77695f8bb64e00a2a279ff1db3307da3e4fb1107744e799

Download Submit
memory/184-37-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/184-34-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/184-38-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/184-53-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/184-35-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-86-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-89-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/880-84-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2384-99-0x0000000005EE0000-0x0000000006234000-memory.dmp

Filesize
3.3MB

Download
memory/2384-101-0x0000000006960000-0x00000000069AC000-memory.dmp

Filesize
304KB

Download
memory/2384-102-0x0000000071600000-0x000000007164C000-memory.dmp

Filesize
304KB

Download
memory/2384-112-0x00000000075F0000-0x0000000007693000-memory.dmp

Filesize
652KB

Download
memory/2384-113-0x0000000007930000-0x0000000007941000-memory.dmp

Filesize
68KB

Download
memory/2384-114-0x0000000007970000-0x0000000007984000-memory.dmp

Filesize
80KB

Download
memory/3440-40-0x0000000005E30000-0x0000000005E4E000-memory.dmp

Filesize
120KB

Download
memory/3440-71-0x0000000007370000-0x0000000007381000-memory.dmp

Filesize
68KB

Download
memory/3440-27-0x0000000074D30000-0x00000000754E0000-memory.dmp

Filesize
7.7MB

Download
memory/3440-21-0x0000000005720000-0x0000000005786000-memory.dmp

Filesize
408KB

Download
memory/3440-15-0x0000000002540000-0x0000000002576000-memory.dmp

Filesize
216KB

Download
memory/3440-19-0x0000000004E90000-0x0000000004EB2000-memory.dmp

Filesize
136KB

Download
memory/3440-32-0x0000000074D30000-0x00000000754E0000-memory.dmp

Filesize
7.7MB

Download
memory/3440-16-0x0000000004FF0000-0x0000000005618000-memory.dmp

Filesize
6.2MB

Download
memory/3440-42-0x00000000063B0000-0x00000000063FC000-memory.dmp

Filesize
304KB

Download
memory/3440-20-0x0000000004F30000-0x0000000004F96000-memory.dmp

Filesize
408KB

Download
memory/3440-17-0x0000000074D30000-0x00000000754E0000-memory.dmp

Filesize
7.7MB

Download
memory/3440-55-0x0000000075590000-0x00000000755DC000-memory.dmp

Filesize
304KB

Download
memory/3440-54-0x0000000006440000-0x0000000006472000-memory.dmp

Filesize
200KB

Download
memory/3440-65-0x0000000006420000-0x000000000643E000-memory.dmp

Filesize
120KB

Download
memory/3440-66-0x00000000070D0000-0x0000000007173000-memory.dmp

Filesize
652KB

Download
memory/3440-67-0x0000000007800000-0x0000000007E7A000-memory.dmp

Filesize
6.5MB

Download
memory/3440-68-0x0000000007180000-0x000000000719A000-memory.dmp

Filesize
104KB

Download
memory/3440-69-0x00000000071E0000-0x00000000071EA000-memory.dmp

Filesize
40KB

Download
memory/3440-70-0x00000000073F0000-0x0000000007486000-memory.dmp

Filesize
600KB

Download
memory/3440-33-0x0000000005840000-0x0000000005B94000-memory.dmp

Filesize
3.3MB

Download
memory/3440-72-0x00000000073A0000-0x00000000073AE000-memory.dmp

Filesize
56KB

Download
memory/3440-73-0x00000000073B0000-0x00000000073C4000-memory.dmp

Filesize
80KB

Download
memory/3440-74-0x00000000074B0000-0x00000000074CA000-memory.dmp

Filesize
104KB

Download
memory/3440-75-0x0000000007490000-0x0000000007498000-memory.dmp

Filesize
32KB

Download
memory/3440-78-0x0000000074D30000-0x00000000754E0000-memory.dmp

Filesize
7.7MB

Download
memory/4336-0-0x0000000074D3E000-0x0000000074D3F000-memory.dmp

Filesize
4KB

Download
memory/4336-39-0x0000000074D30000-0x00000000754E0000-memory.dmp

Filesize
7.7MB

Download
memory/4336-10-0x0000000008CE0000-0x0000000008D7C000-memory.dmp

Filesize
624KB

Download
memory/4336-9-0x00000000065D0000-0x0000000006690000-memory.dmp

Filesize
768KB

Download
memory/4336-8-0x0000000074D30000-0x00000000754E0000-memory.dmp

Filesize
7.7MB

Download
memory/4336-7-0x0000000074D3E000-0x0000000074D3F000-memory.dmp

Filesize
4KB

Download
memory/4336-6-0x0000000004DD0000-0x0000000004DE0000-memory.dmp

Filesize
64KB

Download
memory/4336-5-0x0000000074D30000-0x00000000754E0000-memory.dmp

Filesize
7.7MB

Download
memory/4336-4-0x0000000004C00000-0x0000000004C0A000-memory.dmp

Filesize
40KB

Download
memory/4336-3-0x0000000004B60000-0x0000000004BF2000-memory.dmp

Filesize
584KB

Download
memory/4336-2-0x00000000051E0000-0x0000000005784000-memory.dmp

Filesize
5.6MB

Download
memory/4336-1-0x00000000000C0000-0x00000000001A2000-memory.dmp

Filesize
904KB

Download