tofsee | 2e5057798c7986c5a5a7487fec0f5dda80145fdbf23eb611fc7663a12994afa5

Analysis

max time kernel
149s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
15/04/2026, 23:04

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General

Target
2026-04-15_7f8e906f4218c99d63729e4943692ce6_amadey_elex_manuscrypt_rhadamanthys_smoke-loader_stop_tofsee.exe
Size 11.4MB
Sample260415-22d64adz3z
SHA256 2e5057798c7986c5a5a7487fec0f5dda80145fdbf23eb611fc7663a12994afa5
MD5 7f8e906f4218c99d63729e4943692ce6
SHA1 6249094a746201543f70d0682b0836a10691f491
SHA512 e85bd30990fb44e4149083ac219a2b02586167c87d0ed05b3dc1e710c778f02e3519bd6341d54ada49acf0c2e618382b43dda3e871c0d067dcf0ec58ac7a242e
SSDEEP 3072:pKPtaVfzJ+xzpxIUgpnvKxvGbqqV7gPCs5lQYFwGfABn/9vOsJp7tvFw3Lw3:0etWkUIy4bVyCs5ZQ/OI
TLSH
T11EC6630981A90D83CEAAFD78768D0A1FCECD505FB04F770922D2F83AF566925DD1B621
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
1480	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\wbooyvpt\ImagePath = "C:\\Windows\\SysWOW64\\wbooyvpt\\yhnywld.exe"	svchost.exe

Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Deletes itself 1 IoCs

pid	Process
1868	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
3576	yhnywld.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 3576 set thread context of 1868	3576	yhnywld.exe	96

Launches sc.exe 3 IoCs

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

pid	Process
4480	sc.exe
3216	sc.exe
3772	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

Program crash 2 IoCs

pid	pid_target	Process	procid_target
1624	1504	WerFault.exe	78
3296	3576	WerFault.exe	90

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	netsh.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	yhnywld.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-15_7f8e906f4218c99d63729e4943692ce6_amadey_elex_manuscrypt_rhadamanthys_smoke-loader_stop_tofsee.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1504 wrote to memory of 1720	1504	2026-04-15_7f8e906f4218c99d63729e4943692ce6_amadey_elex_manuscrypt_rhadamanthys_smoke-loader_stop_tofsee.exe	79
PID 1504 wrote to memory of 644	1504	2026-04-15_7f8e906f4218c99d63729e4943692ce6_amadey_elex_manuscrypt_rhadamanthys_smoke-loader_stop_tofsee.exe	81
PID 1504 wrote to memory of 4480	1504	2026-04-15_7f8e906f4218c99d63729e4943692ce6_amadey_elex_manuscrypt_rhadamanthys_smoke-loader_stop_tofsee.exe	83
PID 1504 wrote to memory of 3216	1504	2026-04-15_7f8e906f4218c99d63729e4943692ce6_amadey_elex_manuscrypt_rhadamanthys_smoke-loader_stop_tofsee.exe	85
PID 1504 wrote to memory of 3772	1504	2026-04-15_7f8e906f4218c99d63729e4943692ce6_amadey_elex_manuscrypt_rhadamanthys_smoke-loader_stop_tofsee.exe	87
PID 1504 wrote to memory of 1480	1504	2026-04-15_7f8e906f4218c99d63729e4943692ce6_amadey_elex_manuscrypt_rhadamanthys_smoke-loader_stop_tofsee.exe	91
PID 3576 wrote to memory of 1868	3576	yhnywld.exe	96
PID 3576 wrote to memory of 1868	3576	yhnywld.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-04-15_7f8e906f4218c99d63729e4943692ce6_amadey_elex_manuscrypt_rhadamanthys_smoke-loader_stop_tofsee.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_7f8e906f4218c99d63729e4943692ce6_amadey_elex_manuscrypt_rhadamanthys_smoke-loader_stop_tofsee.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1504
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wbooyvpt\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1720
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yhnywld.exe" C:\Windows\SysWOW64\wbooyvpt\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:644
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create wbooyvpt binPath= "C:\Windows\SysWOW64\wbooyvpt\yhnywld.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-04-15_7f8e906f4218c99d63729e4943692ce6_amadey_elex_manuscrypt_rhadamanthys_smoke-loader_stop_tofsee.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4480
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description wbooyvpt "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3216
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start wbooyvpt
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3772
- 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:1480
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1504 -s 944
  2⤵
  - Program crash
  PID:1624

C:\Windows\SysWOW64\wbooyvpt\yhnywld.exe
C:\Windows\SysWOW64\wbooyvpt\yhnywld.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-04-15_7f8e906f4218c99d63729e4943692ce6_amadey_elex_manuscrypt_rhadamanthys_smoke-loader_stop_tofsee.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3576
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:1868
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3576 -s 540
  2⤵
  - Program crash
  PID:3296

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 1504 -ip 1504
1⤵
PID:2148

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 3576 -ip 3576
1⤵
PID:1056

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

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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Downloads

yhnywld.exe

Path C:\Users\Admin\AppData\Local\Temp\yhnywld.exe
Size 10.7MB
SHA256 4698f692093c28892dfc4501b9bfc250f1753abf343d48c7450f94320eb7bf49
MD5 7aae7c750230410793ab22361f5b846f
SHA1 02178e3f0493db399e69db5f957d4f6fb28234d2
SHA512 a20e209e04b3bfa64a87b43bc69ebdd663aa586ad109d784ce272ed3fa1f36b0b21f9aaa73cbadd63e9c774f9510d691e0765aa720ff323f2a41a8441bf6d59a
SSDEEP 3072:JKPtaVfzJ+xzpxIUgpnvKxvGbqqV7gPCs5lQYFwGfABn/9vOsJp7tvFw3Lw3:UetWkUIy4bVyCs5ZQ/OI
TLSH
T15AB6630981A90D83CEAAFD78768D0A1FCECD505FB04F770922D2F83AF566925DD1B621
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/1504-2-0x00000000025C0000-0x00000000025D3000-memory.dmp

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memory/1504-1-0x0000000000850000-0x0000000000950000-memory.dmp

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memory/1504-8-0x00000000025C0000-0x00000000025D3000-memory.dmp

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memory/1504-7-0x0000000000C70000-0x0000000000E1C000-memory.dmp

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memory/1868-11-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

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memory/1868-13-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

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memory/1868-12-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

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memory/1868-14-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

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memory/3576-10-0x0000000000A70000-0x0000000000B70000-memory.dmp

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memory/3576-16-0x0000000000B70000-0x0000000000D1C000-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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