tofsee | eb841ffe2d0c66d018d4d53b6a787a61c405c28def7bed3274814dddf793ae4a

General

Target

$R4UBC5O.exe
Size

208KB
MD5

40f7ef5677b0ab00743c0a66b2d9c96a
SHA1

a3b64e7d2731a21d9b574ab3f3a804474d5ce3ff
SHA256

eb841ffe2d0c66d018d4d53b6a787a61c405c28def7bed3274814dddf793ae4a
SHA512

9d8fd1de044f8bb399d6b6003abb573ecf00bfc270fa4d2c19f1d97d3dbc040557acf838e4673d5b859817aa9e76d008a5ac999320ee2b0ded409fe7de624689
SSDEEP

3072:wZ4mW1Q1X5y/62wLAebhfcZsPj9w1RBeg8+/yGNV:i4ZA5862w79kZYkRBeA

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

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

Processes:

netsh.exe

pid process

2676 netsh.exe

pid	process
2676	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\hfzwrcq\ImagePath = "C:\\Windows\\SysWOW64\\hfzwrcq\\xnnkwiyw.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

2680 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

xnnkwiyw.exe

pid process

3004 xnnkwiyw.exe
Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

xnnkwiyw.exe

description pid process target process

PID 3004 set thread context of 2680 3004 xnnkwiyw.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

2896 sc.exe
2784 sc.exe
2936 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2680	svchost.exe

pid	process
3004	xnnkwiyw.exe

description	ioc	process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

description	pid	process	target process
PID 3004 set thread context of 2680	3004	xnnkwiyw.exe	svchost.exe

pid	process
2896	sc.exe
2784	sc.exe
2936	sc.exe

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

Processes:

netsh.exe

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

Processes:

cmd.exesc.exesc.exesc.exenetsh.exe$R4UBC5O.execmd.exexnnkwiyw.exesvchost.exe

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	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	$R4UBC5O.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	xnnkwiyw.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

description	ioc	process
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 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	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

$R4UBC5O.exexnnkwiyw.exe

description	pid	process	target process
PID 2208 wrote to memory of 2744	2208	$R4UBC5O.exe	cmd.exe
PID 2208 wrote to memory of 2744	2208	$R4UBC5O.exe	cmd.exe
PID 2208 wrote to memory of 2744	2208	$R4UBC5O.exe	cmd.exe
PID 2208 wrote to memory of 2744	2208	$R4UBC5O.exe	cmd.exe
PID 2208 wrote to memory of 2760	2208	$R4UBC5O.exe	cmd.exe
PID 2208 wrote to memory of 2760	2208	$R4UBC5O.exe	cmd.exe
PID 2208 wrote to memory of 2760	2208	$R4UBC5O.exe	cmd.exe
PID 2208 wrote to memory of 2760	2208	$R4UBC5O.exe	cmd.exe
PID 2208 wrote to memory of 2896	2208	$R4UBC5O.exe	sc.exe
PID 2208 wrote to memory of 2896	2208	$R4UBC5O.exe	sc.exe
PID 2208 wrote to memory of 2896	2208	$R4UBC5O.exe	sc.exe
PID 2208 wrote to memory of 2896	2208	$R4UBC5O.exe	sc.exe
PID 2208 wrote to memory of 2784	2208	$R4UBC5O.exe	sc.exe
PID 2208 wrote to memory of 2784	2208	$R4UBC5O.exe	sc.exe
PID 2208 wrote to memory of 2784	2208	$R4UBC5O.exe	sc.exe
PID 2208 wrote to memory of 2784	2208	$R4UBC5O.exe	sc.exe
PID 2208 wrote to memory of 2936	2208	$R4UBC5O.exe	sc.exe
PID 2208 wrote to memory of 2936	2208	$R4UBC5O.exe	sc.exe
PID 2208 wrote to memory of 2936	2208	$R4UBC5O.exe	sc.exe
PID 2208 wrote to memory of 2936	2208	$R4UBC5O.exe	sc.exe
PID 2208 wrote to memory of 2676	2208	$R4UBC5O.exe	netsh.exe
PID 2208 wrote to memory of 2676	2208	$R4UBC5O.exe	netsh.exe
PID 2208 wrote to memory of 2676	2208	$R4UBC5O.exe	netsh.exe
PID 2208 wrote to memory of 2676	2208	$R4UBC5O.exe	netsh.exe
PID 3004 wrote to memory of 2680	3004	xnnkwiyw.exe	svchost.exe
PID 3004 wrote to memory of 2680	3004	xnnkwiyw.exe	svchost.exe
PID 3004 wrote to memory of 2680	3004	xnnkwiyw.exe	svchost.exe
PID 3004 wrote to memory of 2680	3004	xnnkwiyw.exe	svchost.exe
PID 3004 wrote to memory of 2680	3004	xnnkwiyw.exe	svchost.exe
PID 3004 wrote to memory of 2680	3004	xnnkwiyw.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\$R4UBC5O.exe
"C:\Users\Admin\AppData\Local\Temp\$R4UBC5O.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2208
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hfzwrcq\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2744
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xnnkwiyw.exe" C:\Windows\SysWOW64\hfzwrcq\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2760
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create hfzwrcq binPath= "C:\Windows\SysWOW64\hfzwrcq\xnnkwiyw.exe /d\"C:\Users\Admin\AppData\Local\Temp\$R4UBC5O.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2896
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description hfzwrcq "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2784
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start hfzwrcq
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2936
- 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:2676

C:\Windows\SysWOW64\hfzwrcq\xnnkwiyw.exe
C:\Windows\SysWOW64\hfzwrcq\xnnkwiyw.exe /d"C:\Users\Admin\AppData\Local\Temp\$R4UBC5O.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3004
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Modifies data under HKEY_USERS
  PID:2680

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

1

T1569

Service Execution

1

T1569.002

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

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

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

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

Modify Registry

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

C:\Users\Admin\AppData\Local\Temp\xnnkwiyw.exe

Filesize
14.2MB

MD5
d1524ce9773dc3885cfc653d0a49984a

SHA1
f613510bf806e10ef6d27b81381bd5397e96983c

SHA256
0ee82228e4c16c0d5e23c0850d663b1e7d5a4ff9db71a7bd0309599d80034694

SHA512
0034cadaaf70d5ec2421d9b04814c20140cf4ddd3cd7d42a59c9599e1e936ec39385ebfea4b8047d93c1b03697c61798796e74985095501e68c0e240383c9234

Download Submit
memory/2208-8-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2208-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2208-2-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2208-7-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/2208-9-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2208-1-0x00000000005D0000-0x00000000006D0000-memory.dmp

Filesize
1024KB

Download
memory/2680-11-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2680-14-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2680-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2680-16-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2680-18-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/3004-17-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads