tofsee | d3bba24a43c02f7e90c13981e0fba6551e414159ab5a8f066cf44803177a5cce

Analysis

max time kernel
149s
max time network
155s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
03/09/2024, 10:06

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General

Target
78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe
Size 11.3MB
Sample240903-l5f7vsvdpc
SHA256 78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5
MD5 e465df146e4a00ed2e4a0d941003a13c
SHA1 451f1f0877d638646261a730de87929f01debf68
SHA512 39151020dc52e537ae0333a2a317f70406f9da72fb9013fd49358cb71a39fabc5c267e0fb19d2e28dc2fa221b218857b9dc03320f64b03e99fb31a615cc06983
SSDEEP 3072:NoiqjV0QCeV75zMwb2EfDXTBrt0c5f+Z7ApWt+0krytpObPUfAGM4H1M4CjiJNx4:NoiqjWHeV9zthDjBrmA+VkDbSAgQiTx
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

defeatwax.ru
refabyd.info

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\lyexruhd = "0"	svchost.exe

Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
2968	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\lyexruhd\ImagePath = "C:\\Windows\\SysWOW64\\lyexruhd\\fkgywzl.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2712	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2920	fkgywzl.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2920 set thread context of 2712	2920	fkgywzl.exe	43

Launches sc.exe 3 IoCs

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

pid	Process
2104	sc.exe
2816	sc.exe
2832	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

System Location Discovery: System Language Discovery 1 TTPs 9 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	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	fkgywzl.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.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

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1620 wrote to memory of 436	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	30
PID 1620 wrote to memory of 436	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	30
PID 1620 wrote to memory of 436	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	30
PID 1620 wrote to memory of 436	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	30
PID 1620 wrote to memory of 2344	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	32
PID 1620 wrote to memory of 2344	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	32
PID 1620 wrote to memory of 2344	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	32
PID 1620 wrote to memory of 2344	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	32
PID 1620 wrote to memory of 2104	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	34
PID 1620 wrote to memory of 2104	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	34
PID 1620 wrote to memory of 2104	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	34
PID 1620 wrote to memory of 2104	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	34
PID 1620 wrote to memory of 2816	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	36
PID 1620 wrote to memory of 2816	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	36
PID 1620 wrote to memory of 2816	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	36
PID 1620 wrote to memory of 2816	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	36
PID 1620 wrote to memory of 2832	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	38
PID 1620 wrote to memory of 2832	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	38
PID 1620 wrote to memory of 2832	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	38
PID 1620 wrote to memory of 2832	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	38
PID 1620 wrote to memory of 2968	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	41
PID 1620 wrote to memory of 2968	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	41
PID 1620 wrote to memory of 2968	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	41
PID 1620 wrote to memory of 2968	1620	78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe	41
PID 2920 wrote to memory of 2712	2920	fkgywzl.exe	43
PID 2920 wrote to memory of 2712	2920	fkgywzl.exe	43
PID 2920 wrote to memory of 2712	2920	fkgywzl.exe	43
PID 2920 wrote to memory of 2712	2920	fkgywzl.exe	43
PID 2920 wrote to memory of 2712	2920	fkgywzl.exe	43
PID 2920 wrote to memory of 2712	2920	fkgywzl.exe	43

C:\Users\Admin\AppData\Local\Temp\78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe
"C:\Users\Admin\AppData\Local\Temp\78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1620
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lyexruhd\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:436
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fkgywzl.exe" C:\Windows\SysWOW64\lyexruhd\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2344
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create lyexruhd binPath= "C:\Windows\SysWOW64\lyexruhd\fkgywzl.exe /d\"C:\Users\Admin\AppData\Local\Temp\78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2104
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description lyexruhd "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2816
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start lyexruhd
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2832
- 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:2968

C:\Windows\SysWOW64\lyexruhd\fkgywzl.exe
C:\Windows\SysWOW64\lyexruhd\fkgywzl.exe /d"C:\Users\Admin\AppData\Local\Temp\78ffb37d0d83a6cab5ffda39feca2226b7313e14cf2591742a713cbbf4346ef5.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2920
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2712

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

T1569

Service Execution

T1569.002

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

fkgywzl.exe

Path C:\Users\Admin\AppData\Local\Temp\fkgywzl.exe
Size 11.5MB
SHA256 d5f60fb05126cd62f7e8d2a6a5dc0582b6aa723f0ff65810c9838812032ebfcf
MD5 6d2926bc8ebe654bd683ed58eeef33b4
SHA1 382a42f59dcb976d135a8ab3c9d85e105707a74f
SHA512 f594a484eec857b942db098592e6785f12dfbac45fc81dc6e3e82c5c3a6dff6ddd824fb47de638240ec911761527743fe93d432c66054ec30155c10b5e6f7e4d
SSDEEP 3072:voiqjV0QCeV75zMwb2EfDXTBrt0c5f+Z7ApWt+0krytpObPUfAGM4H1M4CjiJNx4:voiqjWHeV9zthDjBrmA+VkDbSAgQiTx
MD5 SHA1 SHA512 SSDEEP

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memory/1620-8-0x0000000000020000-0x0000000000033000-memory.dmp

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memory/1620-3-0x0000000000400000-0x0000000000415000-memory.dmp

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memory/1620-1-0x0000000000970000-0x0000000000A70000-memory.dmp

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memory/1620-7-0x0000000000400000-0x000000000086B000-memory.dmp

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memory/1620-9-0x0000000000400000-0x0000000000415000-memory.dmp

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memory/1620-2-0x0000000000020000-0x0000000000033000-memory.dmp

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memory/2712-11-0x0000000000110000-0x0000000000125000-memory.dmp

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memory/2712-14-0x0000000000110000-0x0000000000125000-memory.dmp

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memory/2712-16-0x0000000000110000-0x0000000000125000-memory.dmp

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memory/2712-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

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memory/2712-18-0x0000000000110000-0x0000000000125000-memory.dmp

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memory/2920-17-0x0000000000400000-0x000000000086B000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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