tofsee | e02a3d35c6708e86e89fc7d06f2f41219cfb7dca206276481a41adc4f0157bb6

General

Target

b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe
Size

12.9MB
MD5

92017ee762ffecb801be76e272ef66b5
SHA1

0171f93700ce9e398725ad857e7384031581846e
SHA256

b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6
SHA512

1701ed30435153b4b765775aeb68dd1e0751ef2cbc14e7016bcda1933060d881fdeb0a9145e527e29a98bcd3caec23433563d6af73babd3ce33c13242d258d75
SSDEEP

12288:BZwvqm0loTlEUKg7/ua4FXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXn:BSvqmNB/d

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru

refabyd.info

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
4044	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\oyxgxajk\ImagePath = "C:\\Windows\\SysWOW64\\oyxgxajk\\elxktghb.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-1-5-21-2412658365-3084825385-3340777666-1000\Control Panel\International\Geo\Nation	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe

Deletes itself 1 IoCs

pid	Process
4396	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
3204	elxktghb.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3204 set thread context of 4396	3204	elxktghb.exe	105

Launches sc.exe 3 IoCs

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

pid	Process
3900	sc.exe
2880	sc.exe
3936	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
2304	704	WerFault.exe	83
1448	3204	WerFault.exe	97

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	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.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	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	elxktghb.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 704 wrote to memory of 3604	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	87
PID 704 wrote to memory of 3604	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	87
PID 704 wrote to memory of 3604	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	87
PID 704 wrote to memory of 4680	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	89
PID 704 wrote to memory of 4680	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	89
PID 704 wrote to memory of 4680	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	89
PID 704 wrote to memory of 3900	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	91
PID 704 wrote to memory of 3900	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	91
PID 704 wrote to memory of 3900	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	91
PID 704 wrote to memory of 2880	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	93
PID 704 wrote to memory of 2880	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	93
PID 704 wrote to memory of 2880	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	93
PID 704 wrote to memory of 3936	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	95
PID 704 wrote to memory of 3936	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	95
PID 704 wrote to memory of 3936	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	95
PID 704 wrote to memory of 4044	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	98
PID 704 wrote to memory of 4044	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	98
PID 704 wrote to memory of 4044	704	b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe	98
PID 3204 wrote to memory of 4396	3204	elxktghb.exe	105
PID 3204 wrote to memory of 4396	3204	elxktghb.exe	105
PID 3204 wrote to memory of 4396	3204	elxktghb.exe	105
PID 3204 wrote to memory of 4396	3204	elxktghb.exe	105
PID 3204 wrote to memory of 4396	3204	elxktghb.exe	105

C:\Users\Admin\AppData\Local\Temp\b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe
"C:\Users\Admin\AppData\Local\Temp\b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:704
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\oyxgxajk\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:3604
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\elxktghb.exe" C:\Windows\SysWOW64\oyxgxajk\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4680
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create oyxgxajk binPath= "C:\Windows\SysWOW64\oyxgxajk\elxktghb.exe /d\"C:\Users\Admin\AppData\Local\Temp\b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3900
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description oyxgxajk "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2880
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start oyxgxajk
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3936
- 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:4044
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 704 -s 1340
  2⤵
  - Program crash
  PID:2304

C:\Windows\SysWOW64\oyxgxajk\elxktghb.exe
C:\Windows\SysWOW64\oyxgxajk\elxktghb.exe /d"C:\Users\Admin\AppData\Local\Temp\b93a47f6924dbe4309eb656760e3edeafdd38061e8ef9add06598f95871260b6.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3204
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:4396
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3204 -s 516
  2⤵
  - Program crash
  PID:1448

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 376 -p 704 -ip 704
1⤵
PID:2892

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 3204 -ip 3204
1⤵
PID:3160

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

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
12.2MB

MD5
62d9e30b4b338b07f5fc82d4ac917d3d

SHA1
054f8419a25aeeac87a1bf2fec1fef614d4daeee

SHA256
6ee1dac1ddcdc753917f00de7a12bddd7133b4863671b279ef95fc47b49766e6

SHA512
aa9e952a81231699489a1b9e53d3458aa2e3b5e42872e06caa9f153dd48433afb01a973958feefa1caf85fc73aea518e7ed28921459f37c8adde60283de5cf82

Download Submit
memory/704-10-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/704-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/704-2-0x0000000000490000-0x00000000004A3000-memory.dmp

Filesize
76KB

Download
memory/704-9-0x0000000000490000-0x00000000004A3000-memory.dmp

Filesize
76KB

Download
memory/704-8-0x0000000000400000-0x000000000044D000-memory.dmp

Filesize
308KB

Download
memory/704-1-0x00000000005A0000-0x00000000006A0000-memory.dmp

Filesize
1024KB

Download
memory/3204-11-0x0000000000400000-0x000000000044D000-memory.dmp

Filesize
308KB

Download
memory/3204-12-0x0000000000400000-0x000000000044D000-memory.dmp

Filesize
308KB

Download
memory/3204-18-0x0000000000400000-0x000000000044D000-memory.dmp

Filesize
308KB

Download
memory/4396-13-0x0000000000D80000-0x0000000000D95000-memory.dmp

Filesize
84KB

Download
memory/4396-15-0x0000000000D80000-0x0000000000D95000-memory.dmp

Filesize
84KB

Download
memory/4396-16-0x0000000000D80000-0x0000000000D95000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads