remcos | 201603841885db2a6499da3de0e24566677f88261a173b9b627cc59c71ec8254

General

Target

2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe
Size

312KB
MD5

110add3fa6022797faf045125eee1b99
SHA1

0626db8390653b9f06f502340135be717898581c
SHA256

201603841885db2a6499da3de0e24566677f88261a173b9b627cc59c71ec8254
SHA512

18e7d55424793c4f600fa84af50ae076838c70da851fe269fedc554a431ddc3bb68610866663605c9c54eb92bc5025f3f2989f59e7a0200ed1e25140e2d0f4a7
SSDEEP

6144:/q5pKPwVsrNKjfP35fP7nCYA4TkTfpYt:WpyweZKjfP3dPBJTkL

Score

10^/10

remcos updater discovery persistence rat upx

Malware Config

Extracted

Family

remcos

Version

2.5.0 Pro

Botnet

Updater

C2

212.86.101.12:2404

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
GoogleUpdate.exe
copy_folder
Google Updater
delete_file
false
hide_file
true
hide_keylog_file
false
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
GoogleUpdate-HP0SIQ
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
GoogleUpdate
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Signatures

Modifies WinLogon for persistence 2 TTPs 4 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\Google Updater\\GoogleUpdate.exe\""	GoogleUpdate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\Google Updater\\GoogleUpdate.exe\""	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\Google Updater\\GoogleUpdate.exe\""	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\Google Updater\\GoogleUpdate.exe\""	GoogleUpdate.exe

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
remcos

Adds policy Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\GoogleUpdate = "\"C:\\Users\\Admin\\AppData\\Roaming\\Google Updater\\GoogleUpdate.exe\""	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	GoogleUpdate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\GoogleUpdate = "\"C:\\Users\\Admin\\AppData\\Roaming\\Google Updater\\GoogleUpdate.exe\""	GoogleUpdate.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
4884	GoogleUpdate.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-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\GoogleUpdate = "\"C:\\Users\\Admin\\AppData\\Roaming\\Google Updater\\GoogleUpdate.exe\""	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\GoogleUpdate = "\"C:\\Users\\Admin\\AppData\\Roaming\\Google Updater\\GoogleUpdate.exe\""	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\GoogleUpdate = "\"C:\\Users\\Admin\\AppData\\Roaming\\Google Updater\\GoogleUpdate.exe\""	GoogleUpdate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\GoogleUpdate = "\"C:\\Users\\Admin\\AppData\\Roaming\\Google Updater\\GoogleUpdate.exe\""	GoogleUpdate.exe

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	GoogleUpdate.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe

UPX packed file 10 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/3492-3-0x0000000000400000-0x0000000000425000-memory.dmp	upx
behavioral2/memory/3492-12-0x0000000000400000-0x0000000000425000-memory.dmp	upx
behavioral2/memory/3492-10-0x0000000000400000-0x0000000002DCD000-memory.dmp	upx
behavioral2/memory/4884-17-0x0000000000400000-0x0000000002DCD000-memory.dmp	upx
behavioral2/memory/4884-19-0x0000000000400000-0x0000000002DCD000-memory.dmp	upx
behavioral2/memory/4884-21-0x0000000000400000-0x0000000002DCD000-memory.dmp	upx
behavioral2/memory/4884-23-0x0000000000400000-0x0000000002DCD000-memory.dmp	upx
behavioral2/memory/4884-25-0x0000000000400000-0x0000000002DCD000-memory.dmp	upx
behavioral2/memory/4884-28-0x0000000000400000-0x0000000002DCD000-memory.dmp	upx
behavioral2/memory/4884-30-0x0000000000400000-0x0000000002DCD000-memory.dmp	upx

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4628	3492	WerFault.exe	83

System Location Discovery: System Language Discovery 1 TTPs 4 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	GoogleUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3492 wrote to memory of 1492	3492	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe	84
PID 3492 wrote to memory of 1492	3492	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe	84
PID 3492 wrote to memory of 1492	3492	2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe	84
PID 1492 wrote to memory of 2976	1492	WScript.exe	88
PID 1492 wrote to memory of 2976	1492	WScript.exe	88
PID 1492 wrote to memory of 2976	1492	WScript.exe	88
PID 2976 wrote to memory of 4884	2976	cmd.exe	90
PID 2976 wrote to memory of 4884	2976	cmd.exe	90
PID 2976 wrote to memory of 4884	2976	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe
"C:\Users\Admin\AppData\Local\Temp\2025-01-13_110add3fa6022797faf045125eee1b99_mafia.exe"
1⤵
- Modifies WinLogon for persistence
- Adds policy Run key to start application
- Checks computer location settings
- Adds Run key to start application
- Modifies WinLogon
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3492
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1492
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Google Updater\GoogleUpdate.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2976
  - - C:\Users\Admin\AppData\Roaming\Google Updater\GoogleUpdate.exe
      "C:\Users\Admin\AppData\Roaming\Google Updater\GoogleUpdate.exe"
      4⤵
      Modifies WinLogon for persistence
      Adds policy Run key to start application
      Executes dropped EXE
      Adds Run key to start application
      Modifies WinLogon
      System Location Discovery: System Language Discovery
      PID:4884
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3492 -s 1196
  2⤵
  - Program crash
  PID:4628

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 3492 -ip 3492
1⤵
PID:1868

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

4

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

2

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

4

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

2

T1547.004

Defense Evasion

Modify Registry

4

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.vbs

Filesize
446B

MD5
7e1656252779853fe58434abe5ab3de2

SHA1
143d291e422a1330e11da26028d1f60021898da7

SHA256
f3f95e67bbecc1c85fc89cc75203197ffbcd3a911c9579f79d420ef97f6297ad

SHA512
b6147113cb40be8222ed11b4370067ff62c552e9644696480154645919e9b60df5054866f6fc9b80e8981c972939cf2b44501bdc93ccf5bd4461f8b7eae4701d

Download Submit
C:\Users\Admin\AppData\Roaming\Google Updater\GoogleUpdate.exe

Filesize
312KB

MD5
110add3fa6022797faf045125eee1b99

SHA1
0626db8390653b9f06f502340135be717898581c

SHA256
201603841885db2a6499da3de0e24566677f88261a173b9b627cc59c71ec8254

SHA512
18e7d55424793c4f600fa84af50ae076838c70da851fe269fedc554a431ddc3bb68610866663605c9c54eb92bc5025f3f2989f59e7a0200ed1e25140e2d0f4a7

Download Submit
memory/3492-10-0x0000000000400000-0x0000000002DCD000-memory.dmp

Filesize
41.8MB

Download
memory/3492-3-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3492-12-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3492-11-0x0000000002EB0000-0x0000000002EBC000-memory.dmp

Filesize
48KB

Download
memory/3492-1-0x0000000003010000-0x0000000003110000-memory.dmp

Filesize
1024KB

Download
memory/3492-2-0x0000000002EB0000-0x0000000002EBC000-memory.dmp

Filesize
48KB

Download
memory/4884-17-0x0000000000400000-0x0000000002DCD000-memory.dmp

Filesize
41.8MB

Download
memory/4884-19-0x0000000000400000-0x0000000002DCD000-memory.dmp

Filesize
41.8MB

Download
memory/4884-21-0x0000000000400000-0x0000000002DCD000-memory.dmp

Filesize
41.8MB

Download
memory/4884-23-0x0000000000400000-0x0000000002DCD000-memory.dmp

Filesize
41.8MB

Download
memory/4884-25-0x0000000000400000-0x0000000002DCD000-memory.dmp

Filesize
41.8MB

Download
memory/4884-28-0x0000000000400000-0x0000000002DCD000-memory.dmp

Filesize
41.8MB

Download
memory/4884-30-0x0000000000400000-0x0000000002DCD000-memory.dmp

Filesize
41.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads