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

2660 netsh.exe

pid	process
2660	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\jeipbuid\ImagePath = "C:\\Windows\\SysWOW64\\jeipbuid\\ayijlhkq.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

Processes:

$R4UBC5O.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	$R4UBC5O.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

2712 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

ayijlhkq.exe

pid process

1536 ayijlhkq.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:

ayijlhkq.exe

description pid process target process

PID 1536 set thread context of 2712 1536 ayijlhkq.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

3148 sc.exe
3448 sc.exe
2400 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2712	svchost.exe

pid	process
1536	ayijlhkq.exe

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

description	pid	process	target process
PID 1536 set thread context of 2712	1536	ayijlhkq.exe	svchost.exe

pid	process
3148	sc.exe
3448	sc.exe
2400	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

Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

2004 1900 WerFault.exe $R4UBC5O.exe
4504 1536 WerFault.exe ayijlhkq.exe

pid	pid_target	process	target process
2004	1900	WerFault.exe	$R4UBC5O.exe
4504	1536	WerFault.exe	ayijlhkq.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:

sc.exesc.exeayijlhkq.exe$R4UBC5O.execmd.execmd.exesc.exenetsh.exesvchost.exe

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	ayijlhkq.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	cmd.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	svchost.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

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

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

$R4UBC5O.exeayijlhkq.exe

description	pid	process	target process
PID 1900 wrote to memory of 2596	1900	$R4UBC5O.exe	cmd.exe
PID 1900 wrote to memory of 2596	1900	$R4UBC5O.exe	cmd.exe
PID 1900 wrote to memory of 2596	1900	$R4UBC5O.exe	cmd.exe
PID 1900 wrote to memory of 1164	1900	$R4UBC5O.exe	cmd.exe
PID 1900 wrote to memory of 1164	1900	$R4UBC5O.exe	cmd.exe
PID 1900 wrote to memory of 1164	1900	$R4UBC5O.exe	cmd.exe
PID 1900 wrote to memory of 2400	1900	$R4UBC5O.exe	sc.exe
PID 1900 wrote to memory of 2400	1900	$R4UBC5O.exe	sc.exe
PID 1900 wrote to memory of 2400	1900	$R4UBC5O.exe	sc.exe
PID 1900 wrote to memory of 3148	1900	$R4UBC5O.exe	sc.exe
PID 1900 wrote to memory of 3148	1900	$R4UBC5O.exe	sc.exe
PID 1900 wrote to memory of 3148	1900	$R4UBC5O.exe	sc.exe
PID 1900 wrote to memory of 3448	1900	$R4UBC5O.exe	sc.exe
PID 1900 wrote to memory of 3448	1900	$R4UBC5O.exe	sc.exe
PID 1900 wrote to memory of 3448	1900	$R4UBC5O.exe	sc.exe
PID 1900 wrote to memory of 2660	1900	$R4UBC5O.exe	netsh.exe
PID 1900 wrote to memory of 2660	1900	$R4UBC5O.exe	netsh.exe
PID 1900 wrote to memory of 2660	1900	$R4UBC5O.exe	netsh.exe
PID 1536 wrote to memory of 2712	1536	ayijlhkq.exe	svchost.exe
PID 1536 wrote to memory of 2712	1536	ayijlhkq.exe	svchost.exe
PID 1536 wrote to memory of 2712	1536	ayijlhkq.exe	svchost.exe
PID 1536 wrote to memory of 2712	1536	ayijlhkq.exe	svchost.exe
PID 1536 wrote to memory of 2712	1536	ayijlhkq.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\$R4UBC5O.exe
"C:\Users\Admin\AppData\Local\Temp\$R4UBC5O.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1900
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jeipbuid\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2596
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ayijlhkq.exe" C:\Windows\SysWOW64\jeipbuid\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1164
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create jeipbuid binPath= "C:\Windows\SysWOW64\jeipbuid\ayijlhkq.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:2400
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description jeipbuid "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3148
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start jeipbuid
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3448
- 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:2660
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1900 -s 648
  2⤵
  - Program crash
  PID:2004

C:\Windows\SysWOW64\jeipbuid\ayijlhkq.exe
C:\Windows\SysWOW64\jeipbuid\ayijlhkq.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:1536
- 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:2712
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1536 -s 516
  2⤵
  - Program crash
  PID:4504

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 1900 -ip 1900
1⤵
PID:1172

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 1536 -ip 1536
1⤵
PID:1192

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

Query Registry

1

T1012

System Information Discovery

2

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\ayijlhkq.exe

Filesize
12.3MB

MD5
c39c06f9980f7f5fbfbaa9cdb8b15418

SHA1
7d64b958295c95ffa4f1a39f29b89f45fd7cc753

SHA256
77a83ac8e9150d09dba5a006ada9bdd64cef7d6d2c0e700813009d781e7abd9b

SHA512
739892430781be3cb63f9ca3bf245265e35e2ca01c88d935e4632322fee16c40a52d40e4003b041eaa144e4ae5c3c9883f117278b2f11458cba38152aff7cab9

Download Submit
memory/1536-11-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/1536-19-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/1536-13-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/1536-12-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/1900-7-0x0000000000400000-0x0000000000473000-memory.dmp

Filesize
460KB

Download
memory/1900-1-0x00000000006B0000-0x00000000007B0000-memory.dmp

Filesize
1024KB

Download
memory/1900-8-0x00000000021D0000-0x00000000021E3000-memory.dmp

Filesize
76KB

Download
memory/1900-9-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/1900-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/1900-2-0x00000000021D0000-0x00000000021E3000-memory.dmp

Filesize
76KB

Download
memory/2712-14-0x0000000000610000-0x0000000000625000-memory.dmp

Filesize
84KB

Download
memory/2712-16-0x0000000000610000-0x0000000000625000-memory.dmp

Filesize
84KB

Download
memory/2712-17-0x0000000000610000-0x0000000000625000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads