tofsee | 74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2

General

Target
74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2.exe
Size 12.1MB
Sample261111-29tlrasvh1
SHA256 74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2
MD5 8ea0c574e1b080195848860a33603b48
SHA1 765fd44fa3fbb6b0a8d2c1bb10a9488b0df3904e
SHA512 9e171a5ac8dcc24b336919be9247bd4aa74041431ca5600075595b8fb0f4915cac52451f0ef9c31f8dbaa363a1ff0af609703f59ec4bea263c04c3d86eebac25
SSDEEP 49152:uzp2frvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvD:uk
TLSH
T113D6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
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
5440	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
1536	rusnhoyi.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1536 set thread context of 4860	1536	rusnhoyi.exe	101

Launches sc.exe 3 IoCs

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

pid	Process
4100	sc.exe
5184	sc.exe
3396	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
3372	cmd.exe
1960	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	rusnhoyi.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.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	74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3728 wrote to memory of 3372	3728	74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2.exe	89
PID 3728 wrote to memory of 1960	3728	74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2.exe	91
PID 3728 wrote to memory of 4100	3728	74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2.exe	93
PID 3728 wrote to memory of 5184	3728	74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2.exe	95
PID 3728 wrote to memory of 3396	3728	74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2.exe	98
PID 1536 wrote to memory of 4860	1536	rusnhoyi.exe	101
PID 1536 wrote to memory of 4860	1536	rusnhoyi.exe	101
PID 3728 wrote to memory of 5440	3728	74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2.exe	102

C:\Users\Admin\AppData\Local\Temp\74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2.exe
"C:\Users\Admin\AppData\Local\Temp\74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3728
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rcbyupio\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:3372
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rusnhoyi.exe" C:\Windows\SysWOW64\rcbyupio\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:1960
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create rcbyupio binPath= "C:\Windows\SysWOW64\rcbyupio\rusnhoyi.exe /d\"C:\Users\Admin\AppData\Local\Temp\74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4100
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description rcbyupio "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:5184
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start rcbyupio
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3396
- 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:5440

C:\Windows\SysWOW64\rcbyupio\rusnhoyi.exe
C:\Windows\SysWOW64\rcbyupio\rusnhoyi.exe /d"C:\Users\Admin\AppData\Local\Temp\74fc0109a2a9e88f10f5affdc60c8fa5719c9ca969d30e9456c8cfeecef23cb2.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1536
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:4860

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

rusnhoyi.exe

Path C:\Users\Admin\AppData\Local\Temp\rusnhoyi.exe
Size 13.7MB
SHA256 a802c0c062d7a3fbf832f0baa6656a7e273c1dcb979dbfd6af9fa1cbab7d3fbb
MD5 5e26332930bc165d21e030637fba01a5
SHA1 efa73e211963b81d4de56a17446d4f7386ae0331
SHA512 aab73d6adba4d77d26d813e5c355bc18cc8151748c81b6d826358f2f2fca24c95c8d1952d794b69f745d8bbe4e3ffd1a2affb8593a376efed940fc4a9394663d
SSDEEP 49152:szp2frvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrv7:sk
TLSH
T1E3E6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1536-5-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/1536-9-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/3728-0-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/3728-10-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4860-6-0x0000000000690000-0x00000000006D9000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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