tofsee | 8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975

General

Target
8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975.exe
Size 10.9MB
Sample261114-h35kwset81
SHA256 8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975
MD5 70cbf108f9618801d9b3f4283843649c
SHA1 41f2e50e5b68865265ea369f95bc43b083d49b08
SHA512 e9d36780c9271d9a7831e72a57e622acb54d9cfa4a26ad37a9630a3fdf6b9b05bf9ab18d2dbd2644210974a09b09f5439516aff99b75b0fa8f845e9f84d2f350
SSDEEP 49152:KEp0Jrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvz:Kl
TLSH
T130B6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
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
4832	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
360	dknlmmcq.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 360 set thread context of 4356	360	dknlmmcq.exe	100

Launches sc.exe 3 IoCs

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

pid	Process
4288	sc.exe
5568	sc.exe
5364	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
6076	cmd.exe
1920	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	8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	dknlmmcq.exe
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

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4008 wrote to memory of 6076	4008	8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975.exe	88
PID 4008 wrote to memory of 1920	4008	8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975.exe	90
PID 4008 wrote to memory of 4288	4008	8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975.exe	92
PID 4008 wrote to memory of 5568	4008	8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975.exe	95
PID 4008 wrote to memory of 5364	4008	8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975.exe	97
PID 360 wrote to memory of 4356	360	dknlmmcq.exe	100
PID 360 wrote to memory of 4356	360	dknlmmcq.exe	100
PID 4008 wrote to memory of 4832	4008	8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975.exe	101

C:\Users\Admin\AppData\Local\Temp\8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975.exe
"C:\Users\Admin\AppData\Local\Temp\8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4008
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uozlecsi\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:6076
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dknlmmcq.exe" C:\Windows\SysWOW64\uozlecsi\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:1920
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create uozlecsi binPath= "C:\Windows\SysWOW64\uozlecsi\dknlmmcq.exe /d\"C:\Users\Admin\AppData\Local\Temp\8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4288
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description uozlecsi "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:5568
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start uozlecsi
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:5364
- 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:4832

C:\Windows\SysWOW64\uozlecsi\dknlmmcq.exe
C:\Windows\SysWOW64\uozlecsi\dknlmmcq.exe /d"C:\Users\Admin\AppData\Local\Temp\8c1e0f90366478c83bdd333ca6f796c5533a31c5d43e9a56e0a504c1646e1975.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:360
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:4356

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

dknlmmcq.exe

Path C:\Users\Admin\AppData\Local\Temp\dknlmmcq.exe
Size 14.9MB
SHA256 edf7a588a6b66d8011145fb4e889ecacd0c0a9c9d6b2ea84019307204dbf140a
MD5 92482ab2a13f56cf2ec8632441cdbbf9
SHA1 8a25368a145d901cb1ba999db6913b0b67f48436
SHA512 a8aeb896a8368ecff3dde0730ab107da24e0d6e0d2fa425eb7d09d188389191a1b4882255443d7205e03dbe734f3798ccd7b05e383c638649d5f94a44e3997e7
SSDEEP 49152:KEp0JrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvT:Kl
TLSH
T1F3F6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/360-5-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/360-8-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4008-0-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4008-10-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4356-6-0x0000000000B00000-0x0000000000B49000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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