tofsee | 337df24a0a893ff8c2930d5ccf98713a8fc0c28e4563115b8cf7abf875be3403

General

Target

6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe
Size

12.1MB
MD5

873d61d252596ef91e699d9c5a641119
SHA1

fac32b3b99469b90641d7916d7681fef16d392c4
SHA256

6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20
SHA512

66d54af51f53b35f5a6f2527da45a5a1e59b22768f3aed12631f23c61293a410c9cf08f8a5c848c9884ea418935584e47a37574659c71a4ec6441afed52b7325
SSDEEP

6144:Y1eOABi9y39q2xwt8hW5B3rmKYXIOk43AnscO:Y1PEik39bwtMGd6KK33Y

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

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

Processes:

netsh.exe

pid	Process
3688	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\lmegkexb\ImagePath = "C:\\Windows\\SysWOW64\\lmegkexb\\ysblybgs.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:

6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid	Process
4848	svchost.exe

Executes dropped EXE 1 IoCs

Processes:

ysblybgs.exe

pid	Process
2180	ysblybgs.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

ysblybgs.exe

description	pid	Process	procid_target
PID 2180 set thread context of 4848	2180	ysblybgs.exe	104

Launches sc.exe 3 IoCs

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

Processes:

sc.exesc.exesc.exe

pid	Process
2892	sc.exe
2660	sc.exe
4392	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

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	procid_target
3900	4972	WerFault.exe	82
708	2180	WerFault.exe	96

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:

netsh.exeysblybgs.exe6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.execmd.execmd.exesc.exesc.exesc.exesvchost.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ysblybgs.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.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	sc.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

Processes:

6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exeysblybgs.exe

description	pid	Process	procid_target
PID 4972 wrote to memory of 2428	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	86
PID 4972 wrote to memory of 2428	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	86
PID 4972 wrote to memory of 2428	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	86
PID 4972 wrote to memory of 4904	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	88
PID 4972 wrote to memory of 4904	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	88
PID 4972 wrote to memory of 4904	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	88
PID 4972 wrote to memory of 2892	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	90
PID 4972 wrote to memory of 2892	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	90
PID 4972 wrote to memory of 2892	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	90
PID 4972 wrote to memory of 2660	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	92
PID 4972 wrote to memory of 2660	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	92
PID 4972 wrote to memory of 2660	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	92
PID 4972 wrote to memory of 4392	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	94
PID 4972 wrote to memory of 4392	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	94
PID 4972 wrote to memory of 4392	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	94
PID 4972 wrote to memory of 3688	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	99
PID 4972 wrote to memory of 3688	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	99
PID 4972 wrote to memory of 3688	4972	6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe	99
PID 2180 wrote to memory of 4848	2180	ysblybgs.exe	104
PID 2180 wrote to memory of 4848	2180	ysblybgs.exe	104
PID 2180 wrote to memory of 4848	2180	ysblybgs.exe	104
PID 2180 wrote to memory of 4848	2180	ysblybgs.exe	104
PID 2180 wrote to memory of 4848	2180	ysblybgs.exe	104

C:\Users\Admin\AppData\Local\Temp\6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe
"C:\Users\Admin\AppData\Local\Temp\6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4972
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lmegkexb\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2428
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ysblybgs.exe" C:\Windows\SysWOW64\lmegkexb\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4904
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create lmegkexb binPath= "C:\Windows\SysWOW64\lmegkexb\ysblybgs.exe /d\"C:\Users\Admin\AppData\Local\Temp\6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2892
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description lmegkexb "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2660
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start lmegkexb
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4392
- 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:3688
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4972 -s 1268
  2⤵
  - Program crash
  PID:3900

C:\Windows\SysWOW64\lmegkexb\ysblybgs.exe
C:\Windows\SysWOW64\lmegkexb\ysblybgs.exe /d"C:\Users\Admin\AppData\Local\Temp\6ee402c592b8d9a8f65b1e9871916bf8bf08118253758af2bd8d02b053b3af20.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2180
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:4848
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2180 -s 524
  2⤵
  - Program crash
  PID:708

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4972 -ip 4972
1⤵
PID:544

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2180 -ip 2180
1⤵
PID:988

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\ysblybgs.exe

Filesize
11.1MB

MD5
c84e134e0fa013a9c6f665e0f255d369

SHA1
686d9d9b0e70c3e22a471f0939af6e8571084bb7

SHA256
5e67299a59b8a6e6399a3e538534718e6817d13c645b941d114770d898a3bc1d

SHA512
332ca08df63c657fea651e378f0fc2b1c4cbf23048dbb7e3b905e1f7d5e7809bba505e2552d7624fac55d9a315290a111733e1bc8c6022ece496ffc2927b1e4e

Download Submit
memory/2180-14-0x0000000000400000-0x0000000002B90000-memory.dmp

Filesize
39.6MB

Download
memory/4848-11-0x0000000000560000-0x0000000000575000-memory.dmp

Filesize
84KB

Download
memory/4848-13-0x0000000000560000-0x0000000000575000-memory.dmp

Filesize
84KB

Download
memory/4848-15-0x0000000000560000-0x0000000000575000-memory.dmp

Filesize
84KB

Download
memory/4972-1-0x0000000002B90000-0x0000000002C90000-memory.dmp

Filesize
1024KB

Download
memory/4972-2-0x0000000003130000-0x0000000003143000-memory.dmp

Filesize
76KB

Download
memory/4972-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/4972-9-0x0000000003130000-0x0000000003143000-memory.dmp

Filesize
76KB

Download
memory/4972-10-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/4972-8-0x0000000000400000-0x0000000002B90000-memory.dmp

Filesize
39.6MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads