tofsee | f33a6fdb8508f646674ccc47eb4a28c52da2decf574e7650374046529cde8356

Analysis

max time kernel
144s
max time network
135s
platform
windows10-2004_x64
resource
win10v2004-20250313-en
resource tags

arch:x64arch:x86image:win10v2004-20250313-enlocale:en-usos:windows10-2004-x64system
submitted
18/04/2025, 12:20

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General

Target
2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe
Size 14.1MB
Sample250418-phyeeavn14
SHA256 f33a6fdb8508f646674ccc47eb4a28c52da2decf574e7650374046529cde8356
MD5 cdc41eb4c916b813af6bd8be8b323c29
SHA1 48bce7e7278b62b1647766ec36b5a7569c51bf2e
SHA512 d35555b907c79ca6d9bbcad9cf1343bf65632679df8f4dab4460405f1782a6ef3ec375be8c2b5a201224cdb0e073736b01d3c3f67c87984e465950bae3af7193
SSDEEP 12288:AIRZTEoH9MjgxD3OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO4:XhEodMKc
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee defense_evasion discovery execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

43.231.4.7
lazystax.ru

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Tofsee family
tofsee
Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Modifies Windows Firewall 2 TTPs 1 IoCs

defense_evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
968	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\bjfkwqjr\ImagePath = "C:\\Windows\\SysWOW64\\bjfkwqjr\\gsrfqaic.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 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-1-5-21-1279544337-3716153908-718418795-1000\Control Panel\International\Geo\Nation	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe

Deletes itself 1 IoCs

pid	Process
2252	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4868	gsrfqaic.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4868 set thread context of 2252	4868	gsrfqaic.exe	104

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
4824	sc.exe
1976	sc.exe
4576	sc.exe

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

System Information Discovery
T1082

Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

persistence privilege_escalation

Netsh Helper DLL

T1546.007

description	ioc	Process
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
3628	1344	WerFault.exe	85
3596	4868	WerFault.exe	102

System Location Discovery: System Language Discovery 1 TTPs 9 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	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	gsrfqaic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1344 wrote to memory of 5964	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	89
PID 1344 wrote to memory of 5964	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	89
PID 1344 wrote to memory of 5964	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	89
PID 1344 wrote to memory of 1776	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	91
PID 1344 wrote to memory of 1776	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	91
PID 1344 wrote to memory of 1776	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	91
PID 1344 wrote to memory of 4576	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	93
PID 1344 wrote to memory of 4576	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	93
PID 1344 wrote to memory of 4576	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	93
PID 1344 wrote to memory of 4824	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	97
PID 1344 wrote to memory of 4824	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	97
PID 1344 wrote to memory of 4824	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	97
PID 1344 wrote to memory of 1976	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	99
PID 1344 wrote to memory of 1976	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	99
PID 1344 wrote to memory of 1976	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	99
PID 4868 wrote to memory of 2252	4868	gsrfqaic.exe	104
PID 4868 wrote to memory of 2252	4868	gsrfqaic.exe	104
PID 4868 wrote to memory of 2252	4868	gsrfqaic.exe	104
PID 4868 wrote to memory of 2252	4868	gsrfqaic.exe	104
PID 4868 wrote to memory of 2252	4868	gsrfqaic.exe	104
PID 1344 wrote to memory of 968	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	107
PID 1344 wrote to memory of 968	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	107
PID 1344 wrote to memory of 968	1344	2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe	107

C:\Users\Admin\AppData\Local\Temp\2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe
"C:\Users\Admin\AppData\Local\Temp\2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1344
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bjfkwqjr\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:5964
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gsrfqaic.exe" C:\Windows\SysWOW64\bjfkwqjr\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1776
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create bjfkwqjr binPath= "C:\Windows\SysWOW64\bjfkwqjr\gsrfqaic.exe /d\"C:\Users\Admin\AppData\Local\Temp\2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4576
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description bjfkwqjr "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4824
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start bjfkwqjr
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:1976
- C:\Windows\SysWOW64\netsh.exe
  "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
  2⤵
  - Modifies Windows Firewall
  - Event Triggered Execution: Netsh Helper DLL
  - System Location Discovery: System Language Discovery
  PID:968
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1344 -s 1204
  2⤵
  - Program crash
  PID:3628

C:\Windows\SysWOW64\bjfkwqjr\gsrfqaic.exe
C:\Windows\SysWOW64\bjfkwqjr\gsrfqaic.exe /d"C:\Users\Admin\AppData\Local\Temp\2025-04-18_cdc41eb4c916b813af6bd8be8b323c29_black-basta_elex_luca-stealer.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4868
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2252
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4868 -s 552
  2⤵
  - Program crash
  PID:3596

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4868 -ip 4868
1⤵
PID:1180

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 1344 -ip 1344
1⤵
PID:5980

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

System Services

T1569

Service Execution

T1569.002

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

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

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Downloads

gsrfqaic.exe

Path C:\Users\Admin\AppData\Local\Temp\gsrfqaic.exe
Size 13.2MB
SHA256 99147b6a1db5c79d889c7fd7fe233c6e7c9296ad0d1908b5e4c3cda45918a720
MD5 f9e1625b5622ee642ad58867497f30ca
SHA1 558b1ac72c83f2a0031e4ba79b2cce8051bc0954
SHA512 9edcc9588130d7819f3d0db3fe1e048be7f2adcad2332f835e3ecea26fa402164e73df075e1847deaae0a0fe22cdd43ec9d55bacd623b854692e29ecf5cd4024
SSDEEP 12288:uIRZTEoH9MjgxD3OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOP:9hEodMK
MD5 SHA1 SHA512 SSDEEP

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memory/1344-17-0x0000000000400000-0x00000000005F2000-memory.dmp

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memory/1344-2-0x0000000002330000-0x0000000002343000-memory.dmp

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memory/1344-3-0x0000000000400000-0x0000000000415000-memory.dmp

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memory/1344-1-0x0000000000880000-0x0000000000980000-memory.dmp

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memory/1344-19-0x0000000000400000-0x0000000000415000-memory.dmp

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memory/1344-18-0x0000000002330000-0x0000000002343000-memory.dmp

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memory/2252-10-0x0000000000EC0000-0x0000000000ED5000-memory.dmp

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memory/2252-14-0x0000000000EC0000-0x0000000000ED5000-memory.dmp

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memory/2252-22-0x0000000000EC0000-0x0000000000ED5000-memory.dmp

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memory/2252-21-0x0000000000EC0000-0x0000000000ED5000-memory.dmp

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memory/2252-20-0x0000000000EC0000-0x0000000000ED5000-memory.dmp

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memory/4868-8-0x0000000000400000-0x00000000005F2000-memory.dmp

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memory/4868-16-0x0000000000400000-0x00000000005F2000-memory.dmp

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memory/4868-9-0x0000000000400000-0x00000000005F2000-memory.dmp

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memory/4868-13-0x0000000000400000-0x00000000005F2000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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