tofsee | 5166bc7f68594a18219bbe7ae713b68b3b4820848448d8db4525460d73ad84d8

General

Target

2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe
Size

12.9MB
MD5

67130b094de0fe4c0539061c2ba38696
SHA1

d8bf6739ccda3916988e174d9756dc1cffa36c3f
SHA256

5166bc7f68594a18219bbe7ae713b68b3b4820848448d8db4525460d73ad84d8
SHA512

ce05d1ccfbd527fbf66c77d4b68cc749eeef6106502355fdf237f746ed55cdcae7da7ce5244a57c3e7e59a8d094ba0cf8358bb8bc81375dc5a0d27880fb2019f
SSDEEP

49152:XqE0YKr3fYPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPn:XqtYc3

Score

10^/10

tofsee defense_evasion discovery 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

defense_evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
4884	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\yerwuibo\ImagePath = "C:\\Windows\\SysWOW64\\yerwuibo\\cezfylv.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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe

Deletes itself 1 IoCs

pid	Process
3524	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
1888	cezfylv.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1888 set thread context of 3524	1888	cezfylv.exe	95

Launches sc.exe 3 IoCs

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

pid	Process
464	sc.exe
2560	sc.exe
4804	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
1388	1888	WerFault.exe	94
2516	2156	WerFault.exe	82

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	cmd.exe
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	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.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	cezfylv.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2156 wrote to memory of 4964	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	83
PID 2156 wrote to memory of 4964	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	83
PID 2156 wrote to memory of 4964	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	83
PID 2156 wrote to memory of 4516	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	85
PID 2156 wrote to memory of 4516	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	85
PID 2156 wrote to memory of 4516	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	85
PID 2156 wrote to memory of 464	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	87
PID 2156 wrote to memory of 464	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	87
PID 2156 wrote to memory of 464	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	87
PID 2156 wrote to memory of 2560	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	89
PID 2156 wrote to memory of 2560	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	89
PID 2156 wrote to memory of 2560	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	89
PID 2156 wrote to memory of 4804	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	92
PID 2156 wrote to memory of 4804	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	92
PID 2156 wrote to memory of 4804	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	92
PID 2156 wrote to memory of 4884	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	96
PID 2156 wrote to memory of 4884	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	96
PID 2156 wrote to memory of 4884	2156	2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe	96
PID 1888 wrote to memory of 3524	1888	cezfylv.exe	95
PID 1888 wrote to memory of 3524	1888	cezfylv.exe	95
PID 1888 wrote to memory of 3524	1888	cezfylv.exe	95
PID 1888 wrote to memory of 3524	1888	cezfylv.exe	95
PID 1888 wrote to memory of 3524	1888	cezfylv.exe	95

C:\Users\Admin\AppData\Local\Temp\2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe
"C:\Users\Admin\AppData\Local\Temp\2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2156
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yerwuibo\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4964
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cezfylv.exe" C:\Windows\SysWOW64\yerwuibo\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4516
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create yerwuibo binPath= "C:\Windows\SysWOW64\yerwuibo\cezfylv.exe /d\"C:\Users\Admin\AppData\Local\Temp\2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:464
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description yerwuibo "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2560
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start yerwuibo
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4804
- 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:4884
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2156 -s 1036
  2⤵
  - Program crash
  PID:2516

C:\Windows\SysWOW64\yerwuibo\cezfylv.exe
C:\Windows\SysWOW64\yerwuibo\cezfylv.exe /d"C:\Users\Admin\AppData\Local\Temp\2025-01-26_67130b094de0fe4c0539061c2ba38696_mafia.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1888
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:3524
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1888 -s 536
  2⤵
  - Program crash
  PID:1388

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 1888 -ip 1888
1⤵
PID:1416

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 2156 -ip 2156
1⤵
PID:5012

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\cezfylv.exe

Filesize
10.3MB

MD5
6dd13a57c6a06a93be7ae34d9cb92a6a

SHA1
4a7551506dcd411a6385e2a985ba4429de2f63ea

SHA256
103f257a6c4a8617124389d69bc1ae7315e8c0d773548b1eed2d4a4044bdd2be

SHA512
8dfcb3439993a08c21330a926ef161ff0a81f05879a81baad13bfb025c414f161d18590717277ae0c34fd4113caa66cc524589ee919a572936273ad0fa105cc9

Download Submit
memory/1888-10-0x0000000000400000-0x0000000002DC3000-memory.dmp

Filesize
41.8MB

Download
memory/2156-1-0x0000000002FE0000-0x00000000030E0000-memory.dmp

Filesize
1024KB

Download
memory/2156-2-0x0000000002EF0000-0x0000000002F03000-memory.dmp

Filesize
76KB

Download
memory/2156-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2156-13-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2156-12-0x0000000002EF0000-0x0000000002F03000-memory.dmp

Filesize
76KB

Download
memory/2156-11-0x0000000000400000-0x0000000002DC3000-memory.dmp

Filesize
41.8MB

Download
memory/3524-8-0x0000000000D80000-0x0000000000D95000-memory.dmp

Filesize
84KB

Download
memory/3524-15-0x0000000000D80000-0x0000000000D95000-memory.dmp

Filesize
84KB

Download
memory/3524-14-0x0000000000D80000-0x0000000000D95000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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