tofsee | edb58c2175190df64d2d3bd6ddd3b59970dc443da2819dfee0805af801100a0f

General

Target

46ef9327547c02f18b3aacd05b5cf2c1.exe
Size

12.3MB
MD5

46ef9327547c02f18b3aacd05b5cf2c1
SHA1

826d12c54a75c5c8166e8ead2407e372ca3992ca
SHA256

edb58c2175190df64d2d3bd6ddd3b59970dc443da2819dfee0805af801100a0f
SHA512

4a5f08d223cbd12e741360bf0bebbf685d9276592dc8baa9be81da8bf932bf2fa23f9fbb15128797abfb765648a01bc837c9e2e6f750254a630657d393473210
SSDEEP

6144:xvk9RADRUv1CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCa:aRAD

Score

10^/10

tofsee evasion persistence 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
Creates new service(s) 1 TTPs
persistence

Windows Service
T1543.003

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Windows Service

T1543.003

pid	Process
3276	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\wcnhymhs\ImagePath = "C:\\Windows\\SysWOW64\\wcnhymhs\\mkrnmvtk.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-1-5-21-3791175113-1062217823-1177695025-1000\Control Panel\International\Geo\Nation	46ef9327547c02f18b3aacd05b5cf2c1.exe

Deletes itself 1 IoCs

pid	Process
1288	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4052	mkrnmvtk.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4052 set thread context of 1288	4052	mkrnmvtk.exe	104

Launches sc.exe 3 IoCs

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

pid	Process
2908	sc.exe
3652	sc.exe
2856	sc.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 3644 wrote to memory of 2160	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	116
PID 3644 wrote to memory of 2160	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	116
PID 3644 wrote to memory of 2160	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	116
PID 3644 wrote to memory of 4844	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	96
PID 3644 wrote to memory of 4844	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	96
PID 3644 wrote to memory of 4844	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	96
PID 3644 wrote to memory of 3652	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	98
PID 3644 wrote to memory of 3652	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	98
PID 3644 wrote to memory of 3652	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	98
PID 3644 wrote to memory of 2856	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	100
PID 3644 wrote to memory of 2856	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	100
PID 3644 wrote to memory of 2856	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	100
PID 3644 wrote to memory of 2908	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	102
PID 3644 wrote to memory of 2908	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	102
PID 3644 wrote to memory of 2908	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	102
PID 4052 wrote to memory of 1288	4052	mkrnmvtk.exe	104
PID 4052 wrote to memory of 1288	4052	mkrnmvtk.exe	104
PID 4052 wrote to memory of 1288	4052	mkrnmvtk.exe	104
PID 4052 wrote to memory of 1288	4052	mkrnmvtk.exe	104
PID 4052 wrote to memory of 1288	4052	mkrnmvtk.exe	104
PID 3644 wrote to memory of 3276	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	106
PID 3644 wrote to memory of 3276	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	106
PID 3644 wrote to memory of 3276	3644	46ef9327547c02f18b3aacd05b5cf2c1.exe	106

C:\Users\Admin\AppData\Local\Temp\46ef9327547c02f18b3aacd05b5cf2c1.exe
"C:\Users\Admin\AppData\Local\Temp\46ef9327547c02f18b3aacd05b5cf2c1.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3644
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wcnhymhs\
  2⤵
  PID:2160
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mkrnmvtk.exe" C:\Windows\SysWOW64\wcnhymhs\
  2⤵
  PID:4844
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create wcnhymhs binPath= "C:\Windows\SysWOW64\wcnhymhs\mkrnmvtk.exe /d\"C:\Users\Admin\AppData\Local\Temp\46ef9327547c02f18b3aacd05b5cf2c1.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:3652
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description wcnhymhs "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2856
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start wcnhymhs
  2⤵
  - Launches sc.exe
  PID:2908
- 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
  PID:3276

C:\Windows\SysWOW64\wcnhymhs\mkrnmvtk.exe
C:\Windows\SysWOW64\wcnhymhs\mkrnmvtk.exe /d"C:\Users\Admin\AppData\Local\Temp\46ef9327547c02f18b3aacd05b5cf2c1.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4052
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:1288

C:\Windows\System32\sihclient.exe
C:\Windows\System32\sihclient.exe /cv Sb8klhyLaEuR3dEo33BATQ.0.2
1⤵
PID:2160

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

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

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\mkrnmvtk.exe

Filesize
1.2MB

MD5
59108c99bfc64a07654da61af6f18fc2

SHA1
1ba1b92c982afe80a0de05df63b30c3881a8b540

SHA256
f91fccb6638b6dc06d3cf7e9c38b1822074b18d41e07db32f58ca945bb696dc3

SHA512
461c9243e4cc453d23c8c372561d002e47569a0a53d00423c6a7d3a981f77f599c1158d47b364ede95be883de2505959e6253787ab4caf579f440401ed7f1cbf

Download Submit
C:\Windows\SysWOW64\wcnhymhs\mkrnmvtk.exe

Filesize
349KB

MD5
09d2095fd0d3a58315164ae0a2912a25

SHA1
6afeeab65d3326fcad8df067abafb38ecafb0770

SHA256
2ba773db41b46fb153ce9236590bdb31a3be2f1d9dc5f080df526b44b484bb3c

SHA512
f7b007842e8b3d9153b4815e1cb55e0f0cedde2c552f01cc3950d90f31b31e072e7fd43c0c5a2351c7f7c124e74bfa7c3ae1c23a9c9419922810c4a41adcd080

Download Submit
memory/1288-12-0x0000000000D30000-0x0000000000D45000-memory.dmp

Filesize
84KB

Download
memory/1288-8-0x0000000000D30000-0x0000000000D45000-memory.dmp

Filesize
84KB

Download
memory/1288-15-0x0000000000D30000-0x0000000000D45000-memory.dmp

Filesize
84KB

Download
memory/1288-14-0x0000000000D30000-0x0000000000D45000-memory.dmp

Filesize
84KB

Download
memory/1288-16-0x0000000000D30000-0x0000000000D45000-memory.dmp

Filesize
84KB

Download
memory/3644-0-0x00000000009C0000-0x00000000009C1000-memory.dmp

Filesize
4KB

Download
memory/3644-2-0x00000000009D0000-0x00000000009D1000-memory.dmp

Filesize
4KB

Download
memory/3644-1-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3644-13-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4052-10-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4052-6-0x0000000001030000-0x0000000001031000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads