tofsee | 5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca

General

Target
5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca.exe
Size 12.9MB
Sample261114-h4ee4aet91
SHA256 5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca
MD5 f97d64f5abb9dad930923a61ea5f6ca9
SHA1 4c089da593bf880ffc7a17300d687b07cb7297f9
SHA512 c633d1481b25c02e312a71df6d6f65e7a7898b70ee0b2ebc2d3e16eb03cd8adbab00ac568df50635bef3ca56056c35a45318f3881e8c19c580faf1876c7fc0f3
SSDEEP 49152:TeppA1rvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrX:TKA
TLSH
T193D6436676D86ED9D0CA0FBC09A1C42B5DECF734043A953096D1504F98AE78A973CBB3
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
3332	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
2164	dsfbnmfr.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2164 set thread context of 2780	2164	dsfbnmfr.exe	102

Launches sc.exe 3 IoCs

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

pid	Process
4840	sc.exe
5108	sc.exe
5840	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
5104	cmd.exe
4208	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	5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca.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	dsfbnmfr.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	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 4596 wrote to memory of 5104	4596	5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca.exe	90
PID 4596 wrote to memory of 4208	4596	5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca.exe	92
PID 4596 wrote to memory of 4840	4596	5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca.exe	94
PID 4596 wrote to memory of 5108	4596	5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca.exe	96
PID 4596 wrote to memory of 5840	4596	5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca.exe	98
PID 2164 wrote to memory of 2780	2164	dsfbnmfr.exe	102
PID 2164 wrote to memory of 2780	2164	dsfbnmfr.exe	102
PID 4596 wrote to memory of 3332	4596	5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca.exe	103

C:\Users\Admin\AppData\Local\Temp\5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca.exe
"C:\Users\Admin\AppData\Local\Temp\5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4596
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ogzccvjg\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:5104
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dsfbnmfr.exe" C:\Windows\SysWOW64\ogzccvjg\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:4208
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create ogzccvjg binPath= "C:\Windows\SysWOW64\ogzccvjg\dsfbnmfr.exe /d\"C:\Users\Admin\AppData\Local\Temp\5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4840
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description ogzccvjg "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:5108
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start ogzccvjg
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:5840
- 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:3332

C:\Windows\SysWOW64\ogzccvjg\dsfbnmfr.exe
C:\Windows\SysWOW64\ogzccvjg\dsfbnmfr.exe /d"C:\Users\Admin\AppData\Local\Temp\5a66595586c04845091f1412c4bf71b0a1a4d90ce06503444c64c76f5c8596ca.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2164
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:2780

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

dsfbnmfr.exe

Path C:\Users\Admin\AppData\Local\Temp\dsfbnmfr.exe
Size 14.1MB
SHA256 b78818fed1eb41463b97d75955e695ebc6af877fc96a09ff3c1091c7e055ed9a
MD5 6d3b60731d56d433bda0e25f843b6571
SHA1 7778e47852fec11e541bae10587cbe1e32c0b072
SHA512 439b7fbecabcecf55cea9c33890371c08b3f1ff5887d761092690071009a944042e1b939c7124e1a251e2c22ed7d8f6cc1912f35ffa78b3c90fd3366b2d7d851
SSDEEP 49152:OeppA1rvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrr:OKA
TLSH
T1F4E6436676D86ED9D0CA0FBC09A1C42B5DECF734043A953096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2164-5-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/2164-9-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/2780-6-0x0000000000710000-0x0000000000759000-memory.dmp

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memory/4596-0-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4596-10-0x0000000000400000-0x0000000000449000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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