tofsee | ec1ab1ff806a79c022ba96fa0b43f12da9b132242597ec2a4d48f7a9541c4ba9

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20260130-en
resource tags

arch:x64arch:x86image:win10v2004-20260130-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
23/04/2026, 01:55

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General

Target
2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe
Size 15.0MB
Sample260423-ccfaesfz7s
SHA256 ec1ab1ff806a79c022ba96fa0b43f12da9b132242597ec2a4d48f7a9541c4ba9
MD5 33235c8f02fc4259405a8690417da1bb
SHA1 7812ad59adf8bfd9c90e00b6d131a99c3ed0a866
SHA512 e724c7dc12f88868754a66d93162336be539e2ce14985d20c5489f382ff29e77e101cebc82748abae7b3dac58b9e575db803fc4ffde0cd6cdc4e83a9d16a69bb
SSDEEP 6144:DgaoUsajulQpfqtA1C1twSqer5+n/9Sqer5+nDFZxxxxxxxxxxxxxxxxxxxxxxx5:D6taj3k61Ccer5+n1er5+nZ
TLSH
T1B5F6500541F90D57DE66BA34757F0B1FCCE9181A706EB30921A0F16EFAB5953C82A3B2
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion discovery execution tofsee persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

vanaheim.cn
jotunheim.name

Signatures

Family: Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee

Modifies Windows Firewall 2 TTPs 1 IoCs

defense_evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
1992	netsh.exe

Sets service image path in registry 3 TTPs 1 IoCs

This determines the executable launched when a service starts. It can be used to establish persistence.

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Windows Service

T1543.003

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\zoymbygr\ImagePath = "C:\\Windows\\SysWOW64\\zoymbygr\\eyyqtdht.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-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe

Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Deletes itself 1 IoCs

pid	Process
4652	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
712	eyyqtdht.exe

Stops running service(s) 4 TTPs
defense_evasion execution

Windows Service
T1543.003

Impair Defenses
T1562

Service Stop
T1489

Service Execution
T1569.002

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 712 set thread context of 4652	712	eyyqtdht.exe	97

Launches sc.exe 3 IoCs

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

pid	Process
3976	sc.exe
5504	sc.exe
5748	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 value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

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	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	eyyqtdht.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	2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.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

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3536 wrote to memory of 5608	3536	2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe	85
PID 3536 wrote to memory of 4544	3536	2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe	87
PID 3536 wrote to memory of 3976	3536	2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe	89
PID 3536 wrote to memory of 5504	3536	2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe	92
PID 3536 wrote to memory of 5748	3536	2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe	94
PID 712 wrote to memory of 4652	712	eyyqtdht.exe	97
PID 712 wrote to memory of 4652	712	eyyqtdht.exe	97
PID 3536 wrote to memory of 1992	3536	2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe	98

C:\Users\Admin\AppData\Local\Temp\2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3536
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zoymbygr\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:5608
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\eyyqtdht.exe" C:\Windows\SysWOW64\zoymbygr\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4544
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create zoymbygr binPath= "C:\Windows\SysWOW64\zoymbygr\eyyqtdht.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3976
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description zoymbygr "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:5504
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start zoymbygr
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:5748
- 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:1992

C:\Windows\SysWOW64\zoymbygr\eyyqtdht.exe
C:\Windows\SysWOW64\zoymbygr\eyyqtdht.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-04-23_33235c8f02fc4259405a8690417da1bb_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:712
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:4652

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

Service Stop

T1489

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eyyqtdht.exe

Path C:\Users\Admin\AppData\Local\Temp\eyyqtdht.exe
Size 13.7MB
SHA256 100aed7d2e8a03557903ca89e39d7601069a2258e113ac095f5c0122f4419231
MD5 11d0342be31ce7d96903fe7ba4c0420d
SHA1 817d8daff373a29f3519f42215ca276c64978491
SHA512 9743c9df3fa8f770e447a9f6a1ae35373c2700829ccab435d7cbccbe568f3481ec7c2aa1857d579b4185c0a4915da5f14c548b679d20fd9f526ae03b4ce56e2c
SSDEEP 6144:qgaoUsajulQpfqtA1C1twSqer5+n/9Sqer5+nDFZxxxxxxxxxxxxxxxxxxxxxxxH:q6taj3k61Ccer5+n1er5+nZ
TLSH
T10BE6500541F90D57DE66BA34757F0B1FCCE9181A706EB30921A0F16EFAB5953C82A3B2
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/712-10-0x0000000002C10000-0x0000000002CA6000-memory.dmp

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memory/3536-1-0x00000000025A0000-0x00000000026A0000-memory.dmp

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memory/3536-2-0x0000000002460000-0x0000000002473000-memory.dmp

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memory/3536-12-0x0000000003F40000-0x0000000003FD6000-memory.dmp

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memory/3536-13-0x0000000002460000-0x0000000002473000-memory.dmp

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memory/4652-7-0x0000000000F90000-0x0000000000FA5000-memory.dmp

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memory/4652-8-0x0000000000F90000-0x0000000000FA5000-memory.dmp

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memory/4652-14-0x0000000000F90000-0x0000000000FA5000-memory.dmp

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memory/4652-15-0x0000000000F90000-0x0000000000FA5000-memory.dmp

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memory/4652-16-0x0000000001810000-0x00000000018A6000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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