tofsee | 0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a

General

Target
0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a.exe
Size 13.3MB
Sample261101-fx7f7abc87
SHA256 0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a
MD5 8216bd4e19049e202ff84fe3ed4c0f56
SHA1 da29cbc2c55a5f1deffa9bc770ff58b9c7bfae17
SHA512 75f6ff826b9ec04df17e82ef52334e92c10eaea7f8caf96ae39acebe438d8d8076d28f4e342cb6b0de4f73177c484422163ebd97c4cab1e2958b8a37af0a78f0
SSDEEP 49152:0eppA1rvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrf:0KA
TLSH
T1D2E6436676D86ED9D0CA0FBC09A1C42B5DECF734043A953096D1504F98AE78A973CBB3
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
2412	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
5460	keagrbtz.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5460 set thread context of 4548	5460	keagrbtz.exe	100

Launches sc.exe 3 IoCs

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

pid	Process
5860	sc.exe
3996	sc.exe
4880	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 queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key opened	\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
6140	cmd.exe
3328	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	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	keagrbtz.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a.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 4824 wrote to memory of 6140	4824	0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a.exe	88
PID 4824 wrote to memory of 3328	4824	0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a.exe	90
PID 4824 wrote to memory of 3996	4824	0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a.exe	92
PID 4824 wrote to memory of 4880	4824	0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a.exe	95
PID 4824 wrote to memory of 5860	4824	0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a.exe	97
PID 5460 wrote to memory of 4548	5460	keagrbtz.exe	100
PID 5460 wrote to memory of 4548	5460	keagrbtz.exe	100
PID 4824 wrote to memory of 2412	4824	0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a.exe	101

C:\Users\Admin\AppData\Local\Temp\0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a.exe
"C:\Users\Admin\AppData\Local\Temp\0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4824
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zkoujzns\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:6140
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\keagrbtz.exe" C:\Windows\SysWOW64\zkoujzns\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:3328
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create zkoujzns binPath= "C:\Windows\SysWOW64\zkoujzns\keagrbtz.exe /d\"C:\Users\Admin\AppData\Local\Temp\0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3996
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description zkoujzns "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4880
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start zkoujzns
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:5860
- 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:2412

C:\Windows\SysWOW64\zkoujzns\keagrbtz.exe
C:\Windows\SysWOW64\zkoujzns\keagrbtz.exe /d"C:\Users\Admin\AppData\Local\Temp\0ca5ddf6a3f7930ce12092978043db995fb0ccae659a6a33818ce98b83ec428a.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5460
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:4548

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

keagrbtz.exe

Path C:\Users\Admin\AppData\Local\Temp\keagrbtz.exe
Size 12.3MB
SHA256 9ea7bb9707a5cdda1b96ccb43c7b5b802525299655c00352af4fad84a63f82f4
MD5 ede8e779c8256f56bea4689fc8de67dd
SHA1 fd2c5d8ef1750b072907ca70ba284c4e925bd405
SHA512 995e8187f3e781c6f3db5de41879df3516a7f86eccd25bab4da9ef644028608ca984a8799b3762841c244bd1e7ead2502b453131408c8056610d2180545242be
SSDEEP 49152:0eppA1rvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrD:0KA
TLSH
T1C1D6436676D86ED9D0CA0FBC09A1C42B5DECF734043A953096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4548-6-0x0000000000E50000-0x0000000000E99000-memory.dmp

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memory/4824-0-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4824-10-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/5460-5-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/5460-9-0x0000000000400000-0x0000000000449000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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