tofsee | 7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d

General

Target
7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d.exe
Size 10.3MB
Sample261029-h31a6sae76
SHA256 7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d
MD5 114c748dc4c7129f6621e57ecc69eda9
SHA1 9a878c737c8f0c86fb38437ced3051afa2406ede
SHA512 b23389c5485272f0689f02d561263c7685c68c5b4c744a648938b0e18a0c28150a7486bf19a31666a2bd6bfb8f98fa09b94633c0f1c734f80663caf57037e9c8
SSDEEP 49152:teppA1rvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvr3:tKA
TLSH
T1A7B6436676D86ED9D0CA0FBC09A1C42B5DECF734043A953096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion discovery execution tofsee persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru
refabyd.info

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
4384	netsh.exe

Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Executes dropped EXE 1 IoCs

pid	Process
1732	ukfrlxbt.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1732 set thread context of 3588	1732	ukfrlxbt.exe	102

Launches sc.exe 3 IoCs

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

pid	Process
4604	sc.exe
4720	sc.exe
4288	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

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
5784	cmd.exe
4848	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 8 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	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	7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ukfrlxbt.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1196 wrote to memory of 5784	1196	7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d.exe	90
PID 1196 wrote to memory of 4848	1196	7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d.exe	92
PID 1196 wrote to memory of 4604	1196	7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d.exe	94
PID 1196 wrote to memory of 4720	1196	7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d.exe	96
PID 1196 wrote to memory of 4288	1196	7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d.exe	99
PID 1732 wrote to memory of 3588	1732	ukfrlxbt.exe	102
PID 1732 wrote to memory of 3588	1732	ukfrlxbt.exe	102
PID 1196 wrote to memory of 4384	1196	7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d.exe	103

C:\Users\Admin\AppData\Local\Temp\7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d.exe
"C:\Users\Admin\AppData\Local\Temp\7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1196
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mrmkvawl\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:5784
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ukfrlxbt.exe" C:\Windows\SysWOW64\mrmkvawl\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:4848
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create mrmkvawl binPath= "C:\Windows\SysWOW64\mrmkvawl\ukfrlxbt.exe /d\"C:\Users\Admin\AppData\Local\Temp\7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4604
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description mrmkvawl "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4720
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start mrmkvawl
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4288
- 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:4384

C:\Windows\SysWOW64\mrmkvawl\ukfrlxbt.exe
C:\Windows\SysWOW64\mrmkvawl\ukfrlxbt.exe /d"C:\Users\Admin\AppData\Local\Temp\7a276cd58e742cb72869e46cbdfd60d28006787a61a02667298665e774e48c6d.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1732
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:3588

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

System Services

1

T1569

Service Execution

1

T1569.002

Persistence

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

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

1

T1562.004

Credential Access

Discovery

System Information Discovery

1

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

ukfrlxbt.exe

Path C:\Users\Admin\AppData\Local\Temp\ukfrlxbt.exe
Size 14.3MB
SHA256 8e41305ebd871dfbaf1f451bff07d340720f12d7e6988c5c87485aa51b187c75
MD5 c828c4dcd0dafaa500944385b4701ae2
SHA1 8b87df150c64166592a9ca6ca8bb525af57ae7b7
SHA512 d4a8aa4a597d05b71ab4db4ae3f12a68a6b7b9c723930ab423e15f3c1fdc945e0855d82d3e46f3d6bfbf643e20629075961e9dac5dc4c5efca4b2d9dc517e79d
SSDEEP 49152:NeppA1rvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrv:NKA
TLSH
T109E6436676D86ED9D0CA0FBC09A1C42B5DECF734043A953096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1196-0-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/1196-10-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/1732-5-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/1732-9-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/3588-6-0x0000000000390000-0x00000000003D9000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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