tofsee | 843a04f3e1acdd78a036dd537c4840daed7f2b3e8b7f8472c3c20af5a888092b

General

Target

2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe
Size

13.6MB
MD5

a115c76529a4790992d6585ccc323b5d
SHA1

d55d060919f5bde9f5d420f4f9162fd48df1914d
SHA256

843a04f3e1acdd78a036dd537c4840daed7f2b3e8b7f8472c3c20af5a888092b
SHA512

5b006c4ea6b3355561ab5bfd5b2225d39c610f55b2005e816c74f884ba04e896ce091a8a6e1071732fcb4dc41c3d1f8ca1f320897bf2c72135b57f5a468eb275
SSDEEP

24576:XEfmTNIkv/ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZJ:0fotP

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
2640	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\nrwrmskb\ImagePath = "C:\\Windows\\SysWOW64\\nrwrmskb\\sstezayg.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-1-5-21-1121399784-3202166597-3503557106-1000\Control Panel\International\Geo\Nation	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe

Deletes itself 1 IoCs

pid	Process
2900	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
5028	sstezayg.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5028 set thread context of 2900	5028	sstezayg.exe	105

Launches sc.exe 3 IoCs

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

pid	Process
2008	sc.exe
3616	sc.exe
4684	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
4100	2104	WerFault.exe	82
4260	5028	WerFault.exe	99

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	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sstezayg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2104 wrote to memory of 1640	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	89
PID 2104 wrote to memory of 1640	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	89
PID 2104 wrote to memory of 1640	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	89
PID 2104 wrote to memory of 2344	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	91
PID 2104 wrote to memory of 2344	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	91
PID 2104 wrote to memory of 2344	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	91
PID 2104 wrote to memory of 2008	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	93
PID 2104 wrote to memory of 2008	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	93
PID 2104 wrote to memory of 2008	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	93
PID 2104 wrote to memory of 3616	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	95
PID 2104 wrote to memory of 3616	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	95
PID 2104 wrote to memory of 3616	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	95
PID 2104 wrote to memory of 4684	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	97
PID 2104 wrote to memory of 4684	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	97
PID 2104 wrote to memory of 4684	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	97
PID 2104 wrote to memory of 2640	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	100
PID 2104 wrote to memory of 2640	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	100
PID 2104 wrote to memory of 2640	2104	2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe	100
PID 5028 wrote to memory of 2900	5028	sstezayg.exe	105
PID 5028 wrote to memory of 2900	5028	sstezayg.exe	105
PID 5028 wrote to memory of 2900	5028	sstezayg.exe	105
PID 5028 wrote to memory of 2900	5028	sstezayg.exe	105
PID 5028 wrote to memory of 2900	5028	sstezayg.exe	105

C:\Users\Admin\AppData\Local\Temp\2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe
"C:\Users\Admin\AppData\Local\Temp\2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2104
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nrwrmskb\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1640
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sstezayg.exe" C:\Windows\SysWOW64\nrwrmskb\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2344
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create nrwrmskb binPath= "C:\Windows\SysWOW64\nrwrmskb\sstezayg.exe /d\"C:\Users\Admin\AppData\Local\Temp\2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2008
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description nrwrmskb "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3616
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start nrwrmskb
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4684
- 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:2640
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2104 -s 1216
  2⤵
  - Program crash
  PID:4100

C:\Windows\SysWOW64\nrwrmskb\sstezayg.exe
C:\Windows\SysWOW64\nrwrmskb\sstezayg.exe /d"C:\Users\Admin\AppData\Local\Temp\2025-01-31_a115c76529a4790992d6585ccc323b5d_mafia.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5028
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2900
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5028 -s 512
  2⤵
  - Program crash
  PID:4260

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2104 -ip 2104
1⤵
PID:4900

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 5028 -ip 5028
1⤵
PID:3564

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\sstezayg.exe

Filesize
13.8MB

MD5
50f9990dd5e0bbd1febaec58409034d7

SHA1
3ebc9c3b9e178221a996b513da0f350a6c97c53b

SHA256
5b452eccd49c581cb340265255ab4e1fbdd6f3d4d448c3019abd1fdd52a18359

SHA512
8ec04cf325c1eb6a8cc8e3af5152a8c01a7f46f2e39ba4d8e61085037c26d3af4c31191b4ccdbbb338710e2d134fd7c68d8197916328481e4f946546de3cc509

Download Submit
memory/2104-7-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/2104-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2104-2-0x00000000005A0000-0x00000000005B3000-memory.dmp

Filesize
76KB

Download
memory/2104-9-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2104-8-0x00000000005A0000-0x00000000005B3000-memory.dmp

Filesize
76KB

Download
memory/2104-1-0x0000000000730000-0x0000000000830000-memory.dmp

Filesize
1024KB

Download
memory/2900-14-0x0000000000E50000-0x0000000000E65000-memory.dmp

Filesize
84KB

Download
memory/2900-16-0x0000000000E50000-0x0000000000E65000-memory.dmp

Filesize
84KB

Download
memory/2900-17-0x0000000000E50000-0x0000000000E65000-memory.dmp

Filesize
84KB

Download
memory/5028-11-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/5028-12-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/5028-13-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/5028-18-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads