remcos | e744e0aa890a2d9b5e6eed8403cb16f6098baee4a0529b1fabc0644ee4ba6b32

Analysis

max time kernel
150s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
28-11-2024 06:21

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General

Target

remi.exe
Size

959KB
MD5

b074e2458b987efec69536a58316d5a6
SHA1

ffebefa18462d47fc8b82abc9069c9fdd6079da9
SHA256

e744e0aa890a2d9b5e6eed8403cb16f6098baee4a0529b1fabc0644ee4ba6b32
SHA512

1f76d7ae0558962781b913b765ff6b92b5f03aa511c6be2f206ff17c361052d4b34a37d46e49447a0860586474c3bc656ed34d9d094b605d06a6ebfbcc0a2422
SSDEEP

24576:YQm35eXO2xQ7nEP9FsGu0ftQbg665Xp3GuD+XjK:jej2ynElFsGu0fsgD5XpTqXj

Score

10^/10

remcos document discovery execution persistence rat

Malware Config

Extracted

Family

remcos

Botnet

Document

45.138.48.25:3333

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
WinUpdate.exe
copy_folder
WinUpdate
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
true
install_path
%Temp%
keylog_crypt
false
keylog_file
WinUpdat.dat
keylog_flag
false
keylog_folder
WinUpdat
mouse_option
false
mutex
Rmc-E10MWO
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
Remcos family
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
2292	powershell.exe
2436	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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	remi.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	remi.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	WinUpdate.exe

Executes dropped EXE 3 IoCs

pid	Process
2892	WinUpdate.exe
4340	WinUpdate.exe
1000	WinUpdate.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-1-5-21-2437139445-1151884604-3026847218-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-E10MWO = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\WinUpdate\\WinUpdate.exe\""	remi.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-E10MWO = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\WinUpdate\\WinUpdate.exe\""	WinUpdate.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3116 set thread context of 4920	3116	remi.exe	98
PID 2892 set thread context of 1000	2892	WinUpdate.exe	105

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 6 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	remi.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remi.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WinUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WinUpdate.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2292	powershell.exe
2292	powershell.exe
2892	WinUpdate.exe
2892	WinUpdate.exe
2436	powershell.exe
2436	powershell.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1000	WinUpdate.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2292	powershell.exe
Token: SeDebugPrivilege	2892	WinUpdate.exe
Token: SeDebugPrivilege	2436	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1000	WinUpdate.exe

Suspicious use of WriteProcessMemory 32 IoCs

description	pid	Process	procid_target
PID 3116 wrote to memory of 2292	3116	remi.exe	96
PID 3116 wrote to memory of 2292	3116	remi.exe	96
PID 3116 wrote to memory of 2292	3116	remi.exe	96
PID 3116 wrote to memory of 4920	3116	remi.exe	98
PID 3116 wrote to memory of 4920	3116	remi.exe	98
PID 3116 wrote to memory of 4920	3116	remi.exe	98
PID 3116 wrote to memory of 4920	3116	remi.exe	98
PID 3116 wrote to memory of 4920	3116	remi.exe	98
PID 3116 wrote to memory of 4920	3116	remi.exe	98
PID 3116 wrote to memory of 4920	3116	remi.exe	98
PID 3116 wrote to memory of 4920	3116	remi.exe	98
PID 3116 wrote to memory of 4920	3116	remi.exe	98
PID 3116 wrote to memory of 4920	3116	remi.exe	98
PID 4920 wrote to memory of 2892	4920	remi.exe	99
PID 4920 wrote to memory of 2892	4920	remi.exe	99
PID 4920 wrote to memory of 2892	4920	remi.exe	99
PID 2892 wrote to memory of 2436	2892	WinUpdate.exe	102
PID 2892 wrote to memory of 2436	2892	WinUpdate.exe	102
PID 2892 wrote to memory of 2436	2892	WinUpdate.exe	102
PID 2892 wrote to memory of 4340	2892	WinUpdate.exe	104
PID 2892 wrote to memory of 4340	2892	WinUpdate.exe	104
PID 2892 wrote to memory of 4340	2892	WinUpdate.exe	104
PID 2892 wrote to memory of 1000	2892	WinUpdate.exe	105
PID 2892 wrote to memory of 1000	2892	WinUpdate.exe	105
PID 2892 wrote to memory of 1000	2892	WinUpdate.exe	105
PID 2892 wrote to memory of 1000	2892	WinUpdate.exe	105
PID 2892 wrote to memory of 1000	2892	WinUpdate.exe	105
PID 2892 wrote to memory of 1000	2892	WinUpdate.exe	105
PID 2892 wrote to memory of 1000	2892	WinUpdate.exe	105
PID 2892 wrote to memory of 1000	2892	WinUpdate.exe	105
PID 2892 wrote to memory of 1000	2892	WinUpdate.exe	105
PID 2892 wrote to memory of 1000	2892	WinUpdate.exe	105

C:\Users\Admin\AppData\Local\Temp\remi.exe
"C:\Users\Admin\AppData\Local\Temp\remi.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3116
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\remi.exe"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2292
- C:\Users\Admin\AppData\Local\Temp\remi.exe
  "C:\Users\Admin\AppData\Local\Temp\remi.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4920
- - C:\Users\Admin\AppData\Local\Temp\WinUpdate\WinUpdate.exe
    "C:\Users\Admin\AppData\Local\Temp\WinUpdate\WinUpdate.exe"
    3⤵
    - Checks computer location settings
    - 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:2892
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\WinUpdate\WinUpdate.exe"
      4⤵
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2436
  - - C:\Users\Admin\AppData\Local\Temp\WinUpdate\WinUpdate.exe
      "C:\Users\Admin\AppData\Local\Temp\WinUpdate\WinUpdate.exe"
      4⤵
      Executes dropped EXE
      PID:4340
  - - C:\Users\Admin\AppData\Local\Temp\WinUpdate\WinUpdate.exe
      "C:\Users\Admin\AppData\Local\Temp\WinUpdate\WinUpdate.exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      Suspicious behavior: GetForegroundWindowSpam
      Suspicious use of SetWindowsHookEx
      PID:1000

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

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:\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
c8541165779e17a451d32914ab32164d

SHA1
890b80b9b3ddc4cfca2e19c7a8590a1a50821fdd

SHA256
b14a856d64fb6101e51ceb597f5fcd35f33ed931f84046450479deb7c1a241be

SHA512
012601b3e83c9c22ac72787bfec8f33864990935b396b7638ee3db8458fef5e8887f7fe11b3643895ccde2d3cf889d344d83f365f82b18ccd2456cc46f3b2b6e

Download Submit
C:\Users\Admin\AppData\Local\Temp\WinUpdate\WinUpdate.exe

Filesize
959KB

MD5
b074e2458b987efec69536a58316d5a6

SHA1
ffebefa18462d47fc8b82abc9069c9fdd6079da9

SHA256
e744e0aa890a2d9b5e6eed8403cb16f6098baee4a0529b1fabc0644ee4ba6b32

SHA512
1f76d7ae0558962781b913b765ff6b92b5f03aa511c6be2f206ff17c361052d4b34a37d46e49447a0860586474c3bc656ed34d9d094b605d06a6ebfbcc0a2422

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_io1hgimk.sb2.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1000-121-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-124-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-120-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-119-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-118-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-102-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-123-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-88-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-87-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-122-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-85-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-84-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-78-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-81-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-83-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-125-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1000-77-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2292-19-0x0000000005320000-0x0000000005356000-memory.dmp

Filesize
216KB

Download
memory/2292-32-0x0000000005B00000-0x0000000006128000-memory.dmp

Filesize
6.2MB

Download
memory/2292-36-0x0000000006130000-0x0000000006196000-memory.dmp

Filesize
408KB

Download
memory/2292-18-0x0000000074ABE000-0x0000000074ABF000-memory.dmp

Filesize
4KB

Download
memory/2292-35-0x00000000059D0000-0x0000000005A36000-memory.dmp

Filesize
408KB

Download
memory/2292-34-0x0000000005930000-0x0000000005952000-memory.dmp

Filesize
136KB

Download
memory/2292-46-0x00000000062A0000-0x00000000065F4000-memory.dmp

Filesize
3.3MB

Download
memory/2292-47-0x0000000006900000-0x000000000691E000-memory.dmp

Filesize
120KB

Download
memory/2292-48-0x0000000006990000-0x00000000069DC000-memory.dmp

Filesize
304KB

Download
memory/2292-49-0x0000000006ED0000-0x0000000006F02000-memory.dmp

Filesize
200KB

Download
memory/2292-50-0x0000000070350000-0x000000007039C000-memory.dmp

Filesize
304KB

Download
memory/2292-60-0x0000000006F10000-0x0000000006F2E000-memory.dmp

Filesize
120KB

Download
memory/2292-61-0x0000000007AF0000-0x0000000007B93000-memory.dmp

Filesize
652KB

Download
memory/2292-62-0x0000000008270000-0x00000000088EA000-memory.dmp

Filesize
6.5MB

Download
memory/2292-63-0x0000000007C20000-0x0000000007C3A000-memory.dmp

Filesize
104KB

Download
memory/2292-64-0x0000000007C90000-0x0000000007C9A000-memory.dmp

Filesize
40KB

Download
memory/2292-65-0x0000000007EA0000-0x0000000007F36000-memory.dmp

Filesize
600KB

Download
memory/2292-66-0x0000000007E20000-0x0000000007E31000-memory.dmp

Filesize
68KB

Download
memory/2292-67-0x0000000007E50000-0x0000000007E5E000-memory.dmp

Filesize
56KB

Download
memory/2292-68-0x0000000007E60000-0x0000000007E74000-memory.dmp

Filesize
80KB

Download
memory/2292-69-0x0000000007F60000-0x0000000007F7A000-memory.dmp

Filesize
104KB

Download
memory/2292-70-0x0000000007F40000-0x0000000007F48000-memory.dmp

Filesize
32KB

Download
memory/2292-73-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/2292-28-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/2292-20-0x0000000074AB0000-0x0000000075260000-memory.dmp

Filesize
7.7MB

Download
memory/2436-98-0x0000000005BE0000-0x0000000005F34000-memory.dmp

Filesize
3.3MB

Download
memory/2436-115-0x00000000075E0000-0x00000000075F4000-memory.dmp

Filesize
80KB

Download
memory/2436-114-0x00000000075B0000-0x00000000075C1000-memory.dmp

Filesize
68KB

Download
memory/2436-113-0x00000000072B0000-0x0000000007353000-memory.dmp

Filesize
652KB

Download
memory/2436-103-0x00000000732F0000-0x000000007333C000-memory.dmp

Filesize
304KB

Download
memory/2436-100-0x00000000060B0000-0x00000000060FC000-memory.dmp

Filesize
304KB

Download
memory/3116-8-0x0000000074AAE000-0x0000000074AAF000-memory.dmp

Filesize
4KB

Download
memory/3116-4-0x0000000005020000-0x000000000502A000-memory.dmp

Filesize
40KB

Download
memory/3116-10-0x00000000067D0000-0x0000000006894000-memory.dmp

Filesize
784KB

Download
memory/3116-1-0x0000000000670000-0x0000000000766000-memory.dmp

Filesize
984KB

Download
memory/3116-9-0x0000000074AA0000-0x0000000075250000-memory.dmp

Filesize
7.7MB

Download
memory/3116-2-0x0000000005630000-0x0000000005BD4000-memory.dmp

Filesize
5.6MB

Download
memory/3116-3-0x0000000005080000-0x0000000005112000-memory.dmp

Filesize
584KB

Download
memory/3116-17-0x0000000074AA0000-0x0000000075250000-memory.dmp

Filesize
7.7MB

Download
memory/3116-5-0x0000000074AA0000-0x0000000075250000-memory.dmp

Filesize
7.7MB

Download
memory/3116-0-0x0000000074AAE000-0x0000000074AAF000-memory.dmp

Filesize
4KB

Download
memory/3116-7-0x0000000005600000-0x000000000561C000-memory.dmp

Filesize
112KB

Download
memory/3116-6-0x00000000052C0000-0x000000000535C000-memory.dmp

Filesize
624KB

Download
memory/4920-33-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4920-11-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4920-16-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4920-12-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4920-14-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download