remcos | b3738f1c75e476a430aad7db37bc98b72f6315909bf4b9dc2f320d587e41174d

General

Target
b3738f1c75e476a430aad7db37bc98b72f6315909bf4b9dc2f320d587e41174d.exe
Size 487KB
Sample260730-qj9phaaa88
SHA256 b3738f1c75e476a430aad7db37bc98b72f6315909bf4b9dc2f320d587e41174d
MD5 784ab3e8e91f0a207dea9d37433f026a
SHA1 558e2394906e94800005498e4fe7007ee46ab3e3
SHA512 0eb2c43ff8a49d1ed00ea94b80af2b51909d84330e7a23a9c4ac09a03f39f0610bdd1f48a27f0d86bf1c393ce9b5b715b546337b821708b44ecb3089c9816a9e
SSDEEP 6144:nIlSCa0RPvRz+n8Qr1D0ZGESuHabmvHOE4mCp6qtydBnP+Y4+3sAORZGFX3Xc6BJ:n200OFp+G0imvHn3Cp6qyBP+YdsvZGT
TLSH
T158B4BF01B9E2C172D57654300D2AE776DEBCBD2028358D7BB3D60D57FE30190AA39AB6
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

srv discovery remcos persistence rat

Malware Config

Extracted

Family

remcos

Version

6.1.0 Pro

Botnet

SRV

C2

5.181.157.26:40000
5.181.157.26:50000
5.181.157.26:4899

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
update.exe
copy_folder
RST
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
rmc
mouse_option
false
mutex
FUL-EQMFKH
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Extracted

Family

remcos

Botnet

SRV

C2

5.181.157.26:40000
5.181.157.26:50000
5.181.157.26:4899

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
update.exe
copy_folder
RST
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
rmc
mouse_option
false
mutex
FUL-EQMFKH
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

Family: Remcos
Remcos is a closed-source remote control and surveillance software.
rat 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	b3738f1c75e476a430aad7db37bc98b72f6315909bf4b9dc2f320d587e41174d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\FUL-EQMFKH = "\"C:\\ProgramData\\RST\\update.exe\""	b3738f1c75e476a430aad7db37bc98b72f6315909bf4b9dc2f320d587e41174d.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	update.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\FUL-EQMFKH = "\"C:\\ProgramData\\RST\\update.exe\""	update.exe

Executes dropped EXE 1 IoCs

pid	Process
5000	update.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-1-5-21-552508041-2681165170-3229858294-1000\Software\Microsoft\Windows\CurrentVersion\Run\FUL-EQMFKH = "\"C:\\ProgramData\\RST\\update.exe\""	b3738f1c75e476a430aad7db37bc98b72f6315909bf4b9dc2f320d587e41174d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\FUL-EQMFKH = "\"C:\\ProgramData\\RST\\update.exe\""	b3738f1c75e476a430aad7db37bc98b72f6315909bf4b9dc2f320d587e41174d.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-552508041-2681165170-3229858294-1000\Software\Microsoft\Windows\CurrentVersion\Run\FUL-EQMFKH = "\"C:\\ProgramData\\RST\\update.exe\""	update.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\FUL-EQMFKH = "\"C:\\ProgramData\\RST\\update.exe\""	update.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5000 set thread context of 1236	5000	update.exe	90

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 2 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	b3738f1c75e476a430aad7db37bc98b72f6315909bf4b9dc2f320d587e41174d.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	update.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
5000	update.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5000	update.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4348 wrote to memory of 5000	4348	b3738f1c75e476a430aad7db37bc98b72f6315909bf4b9dc2f320d587e41174d.exe	89
PID 5000 wrote to memory of 1236	5000	update.exe	90

C:\Users\Admin\AppData\Local\Temp\b3738f1c75e476a430aad7db37bc98b72f6315909bf4b9dc2f320d587e41174d.exe
"C:\Users\Admin\AppData\Local\Temp\b3738f1c75e476a430aad7db37bc98b72f6315909bf4b9dc2f320d587e41174d.exe"
1⤵
- Adds policy Run key to start application
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4348
- C:\ProgramData\RST\update.exe
  "C:\ProgramData\RST\update.exe"
  2⤵
  - Adds policy Run key to start application
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5000
- - C:\Windows\SysWOW64\rmclient.exe
    rmclient.exe
    3⤵
    PID:1236

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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update.exe

Path C:\ProgramData\RST\update.exe
Size 487KB
SHA256 b3738f1c75e476a430aad7db37bc98b72f6315909bf4b9dc2f320d587e41174d
MD5 784ab3e8e91f0a207dea9d37433f026a
SHA1 558e2394906e94800005498e4fe7007ee46ab3e3
SHA512 0eb2c43ff8a49d1ed00ea94b80af2b51909d84330e7a23a9c4ac09a03f39f0610bdd1f48a27f0d86bf1c393ce9b5b715b546337b821708b44ecb3089c9816a9e
SSDEEP 6144:nIlSCa0RPvRz+n8Qr1D0ZGESuHabmvHOE4mCp6qtydBnP+Y4+3sAORZGFX3Xc6BJ:n200OFp+G0imvHn3Cp6qyBP+YdsvZGT
TLSH
T158B4BF01B9E2C172D57654300D2AE776DEBCBD2028358D7BB3D60D57FE30190AA39AB6
MD5 SHA1 SHA512 SSDEEP TLSH

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logs.dat

Path C:\ProgramData\rmc\logs.dat
Size 144B
SHA256 7f2f0d4620efbd17ec82b247e29f6e4a793692d63f36e83c1a4cd209b2cbf6ac
MD5 ba0eb931db20c5c4631a4c0d8f4dbaec
SHA1 824bd79a91137e8793bf117bbe820ec26dd7f9f1
SHA512 3834ac11be34ce482b3ac5193cd20afc0dd7f285c11c8dd613aa3b8d15d49ae859b35eee506689dfdde6c5592a5f289cdaf6a2a69ed86d88ecff16c471bc5adc
TLSH
T137C092A637E2102AB873B2AB94B305363BB2FD56113CC84D65D5438C09F6A0451817D7
MD5 SHA1 SHA512 TLSH

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memory/1236-2-0x0000000001000000-0x0000000001081000-memory.dmp

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memory/1236-1-0x0000000001000000-0x0000000001081000-memory.dmp

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memory/1236-3-0x0000000001000000-0x0000000001081000-memory.dmp

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memory/1236-4-0x0000000001000000-0x0000000001081000-memory.dmp

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memory/1236-7-0x0000000001000000-0x0000000001081000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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