tofsee | 1a7fa17efcbbce7d07288cf31753af7b8ba2f3dc911a30015f9f8fc53c392285

Analysis

max time kernel
145s
max time network
146s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
31/08/2024, 09:13

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General

Target
bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe
Size 13.1MB
Sample240831-k645msweln
SHA256 bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9
MD5 26dc30509b939d95f3e7ff81bd9c02cd
SHA1 95503eafd7e3bbe829ba4f9cff6863c620e1ac27
SHA512 24a7543199b06358b296e4c0bedb3365c3e29ac054aa3ba7c0a22e49079fa6d672e2dfc25ca8024a06526f16a4515bbc1e8798d715a3416ab4809f9f8a487fb4
SSDEEP 3072:rBM7AAAPsPmgSn/HzaHWgwwQjHF0kKUyodrMpNLbdr05b7pNeoAhTGl9NZ9k222H:C7h1HSn/WHnQjphwNXdr0gU9z
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
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
1008	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\juoaxesb\ImagePath = "C:\\Windows\\SysWOW64\\juoaxesb\\nzuryxxl.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\International\Geo\Nation	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe

Deletes itself 1 IoCs

pid	Process
2632	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4144	nzuryxxl.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4144 set thread context of 2632	4144	nzuryxxl.exe	107

Launches sc.exe 3 IoCs

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

pid	Process
2376	sc.exe
1996	sc.exe
3980	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 value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
3516	2280	WerFault.exe	83
548	4144	WerFault.exe	99

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	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	nzuryxxl.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	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2280 wrote to memory of 2088	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	87
PID 2280 wrote to memory of 2088	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	87
PID 2280 wrote to memory of 2088	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	87
PID 2280 wrote to memory of 2068	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	89
PID 2280 wrote to memory of 2068	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	89
PID 2280 wrote to memory of 2068	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	89
PID 2280 wrote to memory of 1996	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	91
PID 2280 wrote to memory of 1996	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	91
PID 2280 wrote to memory of 1996	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	91
PID 2280 wrote to memory of 3980	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	95
PID 2280 wrote to memory of 3980	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	95
PID 2280 wrote to memory of 3980	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	95
PID 2280 wrote to memory of 2376	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	97
PID 2280 wrote to memory of 2376	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	97
PID 2280 wrote to memory of 2376	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	97
PID 2280 wrote to memory of 1008	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	100
PID 2280 wrote to memory of 1008	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	100
PID 2280 wrote to memory of 1008	2280	bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe	100
PID 4144 wrote to memory of 2632	4144	nzuryxxl.exe	107
PID 4144 wrote to memory of 2632	4144	nzuryxxl.exe	107
PID 4144 wrote to memory of 2632	4144	nzuryxxl.exe	107
PID 4144 wrote to memory of 2632	4144	nzuryxxl.exe	107
PID 4144 wrote to memory of 2632	4144	nzuryxxl.exe	107

C:\Users\Admin\AppData\Local\Temp\bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe
"C:\Users\Admin\AppData\Local\Temp\bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2280
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\juoaxesb\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2088
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nzuryxxl.exe" C:\Windows\SysWOW64\juoaxesb\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2068
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create juoaxesb binPath= "C:\Windows\SysWOW64\juoaxesb\nzuryxxl.exe /d\"C:\Users\Admin\AppData\Local\Temp\bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:1996
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description juoaxesb "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3980
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start juoaxesb
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2376
- 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:1008
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2280 -s 1048
  2⤵
  - Program crash
  PID:3516

C:\Windows\SysWOW64\juoaxesb\nzuryxxl.exe
C:\Windows\SysWOW64\juoaxesb\nzuryxxl.exe /d"C:\Users\Admin\AppData\Local\Temp\bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4144
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2632
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4144 -s 516
  2⤵
  - Program crash
  PID:548

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2280 -ip 2280
1⤵
PID:1364

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4144 -ip 4144
1⤵
PID:4388

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

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

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

nzuryxxl.exe

Path C:\Users\Admin\AppData\Local\Temp\nzuryxxl.exe
Size 12.7MB
SHA256 db9549fcbb24e421f17f9e3ee3a303635712d95024d3a0a8848896aafa22509c
MD5 7a05f7a09f20acf9c1e87b6f6c49d2e3
SHA1 dc1c631126fc8f7c99db308c0a1b62bba3181f29
SHA512 eed8a832b08d8dedba7287208d1f43608bc517c9494daa68bda240de6a75efbcf193cb9d63d8266d648a05310f1bb710668984b4f3f9958f8f596c5cdb321f21
SSDEEP 3072:NBM7AAAPsPmgSn/HzaHWgwwQjHF0kKUyodrMpNLbdr05b7pNeoAhTGl9NZ9k222H:E7h1HSn/WHnQjphwNXdr0gU9z
MD5 SHA1 SHA512 SSDEEP

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memory/2280-1-0x0000000000BC0000-0x0000000000CC0000-memory.dmp

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memory/2280-2-0x00000000009A0000-0x00000000009B3000-memory.dmp

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memory/2280-3-0x0000000000400000-0x0000000000415000-memory.dmp

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memory/2280-10-0x0000000000400000-0x0000000000415000-memory.dmp

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memory/2280-8-0x0000000000400000-0x000000000086C000-memory.dmp

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memory/2280-9-0x00000000009A0000-0x00000000009B3000-memory.dmp

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memory/2632-12-0x0000000000890000-0x00000000008A5000-memory.dmp

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memory/2632-14-0x0000000000890000-0x00000000008A5000-memory.dmp

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memory/2632-15-0x0000000000890000-0x00000000008A5000-memory.dmp

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memory/4144-11-0x0000000000400000-0x000000000086C000-memory.dmp

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memory/4144-17-0x0000000000400000-0x000000000086C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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