remcos | e744e0aa890a2d9b5e6eed8403cb16f6098baee4a0529b1fabc0644ee4ba6b32

Analysis

max time kernel
148s
max time network
150s
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 06:25

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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
780	powershell.exe
1996	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	WinUpdate.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	remi.exe

Executes dropped EXE 2 IoCs

pid	Process
2688	WinUpdate.exe
732	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 2380 set thread context of 4880	2380	remi.exe	99
PID 2688 set thread context of 732	2688	WinUpdate.exe	106

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	remi.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.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 4 IoCs

pid	Process
780	powershell.exe
780	powershell.exe
1996	powershell.exe
1996	powershell.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
732	WinUpdate.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	780	powershell.exe
Token: SeDebugPrivilege	1996	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
732	WinUpdate.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 2380 wrote to memory of 780	2380	remi.exe	97
PID 2380 wrote to memory of 780	2380	remi.exe	97
PID 2380 wrote to memory of 780	2380	remi.exe	97
PID 2380 wrote to memory of 4880	2380	remi.exe	99
PID 2380 wrote to memory of 4880	2380	remi.exe	99
PID 2380 wrote to memory of 4880	2380	remi.exe	99
PID 2380 wrote to memory of 4880	2380	remi.exe	99
PID 2380 wrote to memory of 4880	2380	remi.exe	99
PID 2380 wrote to memory of 4880	2380	remi.exe	99
PID 2380 wrote to memory of 4880	2380	remi.exe	99
PID 2380 wrote to memory of 4880	2380	remi.exe	99
PID 2380 wrote to memory of 4880	2380	remi.exe	99
PID 2380 wrote to memory of 4880	2380	remi.exe	99
PID 4880 wrote to memory of 2688	4880	remi.exe	100
PID 4880 wrote to memory of 2688	4880	remi.exe	100
PID 4880 wrote to memory of 2688	4880	remi.exe	100
PID 2688 wrote to memory of 1996	2688	WinUpdate.exe	104
PID 2688 wrote to memory of 1996	2688	WinUpdate.exe	104
PID 2688 wrote to memory of 1996	2688	WinUpdate.exe	104
PID 2688 wrote to memory of 732	2688	WinUpdate.exe	106
PID 2688 wrote to memory of 732	2688	WinUpdate.exe	106
PID 2688 wrote to memory of 732	2688	WinUpdate.exe	106
PID 2688 wrote to memory of 732	2688	WinUpdate.exe	106
PID 2688 wrote to memory of 732	2688	WinUpdate.exe	106
PID 2688 wrote to memory of 732	2688	WinUpdate.exe	106
PID 2688 wrote to memory of 732	2688	WinUpdate.exe	106
PID 2688 wrote to memory of 732	2688	WinUpdate.exe	106
PID 2688 wrote to memory of 732	2688	WinUpdate.exe	106
PID 2688 wrote to memory of 732	2688	WinUpdate.exe	106

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:2380
- 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:780
- 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:4880
- - 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 use of WriteProcessMemory
    PID:2688
  - - 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:1996
  - - 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:732

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
3d086a433708053f9bf9523e1d87a4e8

SHA1
b3ab5d4f282a4c8fe8c3005b8a557ed5a0e37f28

SHA256
6f8fd1b8d9788ad54eaeee329232187e24b7b43393a01aeba2d6e9675231fb69

SHA512
931ae42b4c68a4507ff2342332b08eb407050d47cf4176137ea022d0f6e513c689e998445a04c6d18d4877391705c586bfce0234632b898d41aaed0957996dfd

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

Filesize
18KB

MD5
d811ae7045d9f9e161b5e17605d18139

SHA1
a81eed8d185978574ea719732929680ff60cf0a0

SHA256
c812eeede79b4f13095f4c0cdb14369f080e07949a75d114b808b3a19b0b95a0

SHA512
b5ab47f41964b5d274504aa881d39b5a825b1dd5d893c0adf8ca38f33bb5ac8f2a4b0a1e3cc6f7302853625a45e56fdbd1f689a8d37418c7134a99d63bbe5292

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_h4uizvcz.dsk.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/732-119-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-84-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-118-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-117-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-116-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-100-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-121-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-122-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-86-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-120-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-83-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-82-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-80-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-75-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-81-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-77-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/732-123-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/780-19-0x0000000074F5E000-0x0000000074F5F000-memory.dmp

Filesize
4KB

Download
memory/780-20-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/780-17-0x0000000000AC0000-0x0000000000AF6000-memory.dmp

Filesize
216KB

Download
memory/780-32-0x0000000004C60000-0x0000000004C82000-memory.dmp

Filesize
136KB

Download
memory/780-33-0x0000000004D00000-0x0000000004D66000-memory.dmp

Filesize
408KB

Download
memory/780-45-0x00000000055B0000-0x0000000005904000-memory.dmp

Filesize
3.3MB

Download
memory/780-46-0x00000000059F0000-0x0000000005A0E000-memory.dmp

Filesize
120KB

Download
memory/780-47-0x0000000005AF0000-0x0000000005B3C000-memory.dmp

Filesize
304KB

Download
memory/780-49-0x00000000757E0000-0x000000007582C000-memory.dmp

Filesize
304KB

Download
memory/780-48-0x0000000005FD0000-0x0000000006002000-memory.dmp

Filesize
200KB

Download
memory/780-59-0x0000000005FB0000-0x0000000005FCE000-memory.dmp

Filesize
120KB

Download
memory/780-60-0x0000000006BD0000-0x0000000006C73000-memory.dmp

Filesize
652KB

Download
memory/780-61-0x0000000007370000-0x00000000079EA000-memory.dmp

Filesize
6.5MB

Download
memory/780-62-0x0000000006D30000-0x0000000006D4A000-memory.dmp

Filesize
104KB

Download
memory/780-63-0x0000000006DA0000-0x0000000006DAA000-memory.dmp

Filesize
40KB

Download
memory/780-64-0x0000000006FB0000-0x0000000007046000-memory.dmp

Filesize
600KB

Download
memory/780-65-0x0000000006F30000-0x0000000006F41000-memory.dmp

Filesize
68KB

Download
memory/780-66-0x0000000006F60000-0x0000000006F6E000-memory.dmp

Filesize
56KB

Download
memory/780-67-0x0000000006F70000-0x0000000006F84000-memory.dmp

Filesize
80KB

Download
memory/780-68-0x0000000007070000-0x000000000708A000-memory.dmp

Filesize
104KB

Download
memory/780-69-0x0000000007050000-0x0000000007058000-memory.dmp

Filesize
32KB

Download
memory/780-72-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/780-21-0x0000000004E10000-0x0000000005438000-memory.dmp

Filesize
6.2MB

Download
memory/780-39-0x0000000005440000-0x00000000054A6000-memory.dmp

Filesize
408KB

Download
memory/1996-92-0x0000000005440000-0x0000000005794000-memory.dmp

Filesize
3.3MB

Download
memory/1996-113-0x0000000007080000-0x0000000007094000-memory.dmp

Filesize
80KB

Download
memory/1996-112-0x0000000007030000-0x0000000007041000-memory.dmp

Filesize
68KB

Download
memory/1996-111-0x0000000006DA0000-0x0000000006E43000-memory.dmp

Filesize
652KB

Download
memory/1996-101-0x0000000071F90000-0x0000000071FDC000-memory.dmp

Filesize
304KB

Download
memory/1996-98-0x00000000060A0000-0x00000000060EC000-memory.dmp

Filesize
304KB

Download
memory/2380-8-0x0000000074F5E000-0x0000000074F5F000-memory.dmp

Filesize
4KB

Download
memory/2380-4-0x0000000004FC0000-0x0000000004FCA000-memory.dmp

Filesize
40KB

Download
memory/2380-10-0x0000000006540000-0x0000000006604000-memory.dmp

Filesize
784KB

Download
memory/2380-1-0x0000000000610000-0x0000000000706000-memory.dmp

Filesize
984KB

Download
memory/2380-9-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/2380-2-0x00000000055F0000-0x0000000005B94000-memory.dmp

Filesize
5.6MB

Download
memory/2380-3-0x0000000005040000-0x00000000050D2000-memory.dmp

Filesize
584KB

Download
memory/2380-18-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/2380-5-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/2380-0-0x0000000074F5E000-0x0000000074F5F000-memory.dmp

Filesize
4KB

Download
memory/2380-7-0x00000000055A0000-0x00000000055BC000-memory.dmp

Filesize
112KB

Download
memory/2380-6-0x00000000052E0000-0x000000000537C000-memory.dmp

Filesize
624KB

Download
memory/4880-44-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4880-11-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4880-16-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4880-13-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4880-12-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download