tofsee | ef14a8e34bd2368ffdd772548caef37f4b13907482f667e6097c960084e07354

General

Target

2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe
Size

13.1MB
MD5

427b1115c6bc283e5e04556c14c8d048
SHA1

b7beb79f1566f865c36f1f37d5a8ccc4cebb2f5c
SHA256

ef14a8e34bd2368ffdd772548caef37f4b13907482f667e6097c960084e07354
SHA512

35e15b7a334f47b64bfed5e05a72e9198b5630e2a2ce1c903b0563da599bc4e863658092b5673e64b1b011a1d7eb14660b9db5048d2a591b9720670babc7b451
SSDEEP

3072:XLBgXOXcdW8tar7vGdq8c7YMl2b8anmMXnb58XuDP9het3Zv1oSW1za2E+w5C2/Y:uOMdRQr7OB0ypmMXnl8XEPM3noSWOC

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

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

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
552	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\bvhwlkgu\ImagePath = "C:\\Windows\\SysWOW64\\bvhwlkgu\\arnulkos.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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe

Deletes itself 1 IoCs

pid	Process
4156	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
3180	arnulkos.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3180 set thread context of 4156	3180	arnulkos.exe	98

Launches sc.exe 3 IoCs

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

pid	Process
4860	sc.exe
3864	sc.exe
2508	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 opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
3692	5056	WerFault.exe	81
4144	3180	WerFault.exe	92

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	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	arnulkos.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	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	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 5056 wrote to memory of 1920	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	82
PID 5056 wrote to memory of 1920	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	82
PID 5056 wrote to memory of 1920	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	82
PID 5056 wrote to memory of 3972	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	84
PID 5056 wrote to memory of 3972	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	84
PID 5056 wrote to memory of 3972	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	84
PID 5056 wrote to memory of 4860	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	86
PID 5056 wrote to memory of 4860	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	86
PID 5056 wrote to memory of 4860	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	86
PID 5056 wrote to memory of 3864	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	88
PID 5056 wrote to memory of 3864	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	88
PID 5056 wrote to memory of 3864	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	88
PID 5056 wrote to memory of 2508	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	90
PID 5056 wrote to memory of 2508	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	90
PID 5056 wrote to memory of 2508	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	90
PID 5056 wrote to memory of 552	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	93
PID 5056 wrote to memory of 552	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	93
PID 5056 wrote to memory of 552	5056	2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe	93
PID 3180 wrote to memory of 4156	3180	arnulkos.exe	98
PID 3180 wrote to memory of 4156	3180	arnulkos.exe	98
PID 3180 wrote to memory of 4156	3180	arnulkos.exe	98
PID 3180 wrote to memory of 4156	3180	arnulkos.exe	98
PID 3180 wrote to memory of 4156	3180	arnulkos.exe	98

C:\Users\Admin\AppData\Local\Temp\2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe
"C:\Users\Admin\AppData\Local\Temp\2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5056
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bvhwlkgu\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1920
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\arnulkos.exe" C:\Windows\SysWOW64\bvhwlkgu\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:3972
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create bvhwlkgu binPath= "C:\Windows\SysWOW64\bvhwlkgu\arnulkos.exe /d\"C:\Users\Admin\AppData\Local\Temp\2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4860
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description bvhwlkgu "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3864
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start bvhwlkgu
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2508
- 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:552
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5056 -s 792
  2⤵
  - Program crash
  PID:3692

C:\Windows\SysWOW64\bvhwlkgu\arnulkos.exe
C:\Windows\SysWOW64\bvhwlkgu\arnulkos.exe /d"C:\Users\Admin\AppData\Local\Temp\2025-01-13_427b1115c6bc283e5e04556c14c8d048_mafia.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3180
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:4156
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3180 -s 508
  2⤵
  - Program crash
  PID:4144

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 5056 -ip 5056
1⤵
PID:1392

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 3180 -ip 3180
1⤵
PID:1948

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

1

T1569

Service Execution

1

T1569.002

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Event Triggered Execution

1

T1546

Netsh Helper DLL

1

T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Event Triggered Execution

1

T1546

Netsh Helper DLL

1

T1546.007

Defense Evasion

Impair Defenses

1

T1562

Disable or Modify System Firewall

Modify Registry

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\arnulkos.exe

Filesize
15.0MB

MD5
368170d47de46c35d33d7dee93f6b956

SHA1
7f70ebb8309c59176166af97efff77f435f8d64c

SHA256
fdfbcb148af2a573855ff4eb0cb417882784b120d059af6eb986e2d8e6e5d1b2

SHA512
945265f79903136821d1ac47e4def734be789e7245d6757b0c59aeb6d8219219a86bd59f8002eddb3ffcc3addab86d6feb46cca3de869ffea663a1e2ff510ff6

Download Submit
memory/3180-13-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/3180-12-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/3180-11-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/3180-19-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/4156-14-0x0000000000F20000-0x0000000000F35000-memory.dmp

Filesize
84KB

Download
memory/4156-16-0x0000000000F20000-0x0000000000F35000-memory.dmp

Filesize
84KB

Download
memory/4156-17-0x0000000000F20000-0x0000000000F35000-memory.dmp

Filesize
84KB

Download
memory/5056-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/5056-2-0x0000000000580000-0x0000000000593000-memory.dmp

Filesize
76KB

Download
memory/5056-9-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/5056-8-0x0000000000580000-0x0000000000593000-memory.dmp

Filesize
76KB

Download
memory/5056-7-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/5056-1-0x00000000005B0000-0x00000000006B0000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads