tofsee | 502b7364888847bc65c657848e93de14b35eaa032bba197c496ef2a3fef4958f

Analysis

max time kernel
151s
max time network
160s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
30/12/2023, 11:05

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General

Target
16bcbac323177a8dc675842da7a747b5.exe
Size 11.7MB
Sample231230-m7bwlaeecq
SHA256 502b7364888847bc65c657848e93de14b35eaa032bba197c496ef2a3fef4958f
MD5 16bcbac323177a8dc675842da7a747b5
SHA1 189a9990e8ac88ab8a3d916558f03bca210bd29d
SHA512 8d7b1a8c4345cbc05634c5e3c69f7a09a0fc991ab34c8cb1771e16b8e6726216736b8101b57f75f00ed54dff0452de75a238737f0783f9153b07d42e30df0068
SSDEEP 6144:zdaQnsbMlI3TiGnvGwJm6DwURRTzoVvaEZ7+XgJ1cPBQD79VVVVVVVVVVVVVVVV5:zdVi3TiGnvGlULRRTzoBaq+XcsyD
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

176.111.174.19
lazystax.ru

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 1 TTPs
persistence

Windows Service
T1543.003

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Windows Service

T1543.003

pid	Process
392	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\jenxzrhg\ImagePath = "C:\\Windows\\SysWOW64\\jenxzrhg\\lbejnseb.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-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation	16bcbac323177a8dc675842da7a747b5.exe

Deletes itself 1 IoCs

pid	Process
2312	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4348	lbejnseb.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4348 set thread context of 2312	4348	lbejnseb.exe	116

Launches sc.exe 3 IoCs

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

pid	Process
3224	sc.exe
4188	sc.exe
4552	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
1076	712	WerFault.exe	88
3496	4348	WerFault.exe	106

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 712 wrote to memory of 1044	712	16bcbac323177a8dc675842da7a747b5.exe	92
PID 712 wrote to memory of 1044	712	16bcbac323177a8dc675842da7a747b5.exe	92
PID 712 wrote to memory of 1044	712	16bcbac323177a8dc675842da7a747b5.exe	92
PID 712 wrote to memory of 1392	712	16bcbac323177a8dc675842da7a747b5.exe	94
PID 712 wrote to memory of 1392	712	16bcbac323177a8dc675842da7a747b5.exe	94
PID 712 wrote to memory of 1392	712	16bcbac323177a8dc675842da7a747b5.exe	94
PID 712 wrote to memory of 3224	712	16bcbac323177a8dc675842da7a747b5.exe	98
PID 712 wrote to memory of 3224	712	16bcbac323177a8dc675842da7a747b5.exe	98
PID 712 wrote to memory of 3224	712	16bcbac323177a8dc675842da7a747b5.exe	98
PID 712 wrote to memory of 4188	712	16bcbac323177a8dc675842da7a747b5.exe	100
PID 712 wrote to memory of 4188	712	16bcbac323177a8dc675842da7a747b5.exe	100
PID 712 wrote to memory of 4188	712	16bcbac323177a8dc675842da7a747b5.exe	100
PID 712 wrote to memory of 4552	712	16bcbac323177a8dc675842da7a747b5.exe	103
PID 712 wrote to memory of 4552	712	16bcbac323177a8dc675842da7a747b5.exe	103
PID 712 wrote to memory of 4552	712	16bcbac323177a8dc675842da7a747b5.exe	103
PID 712 wrote to memory of 392	712	16bcbac323177a8dc675842da7a747b5.exe	107
PID 712 wrote to memory of 392	712	16bcbac323177a8dc675842da7a747b5.exe	107
PID 712 wrote to memory of 392	712	16bcbac323177a8dc675842da7a747b5.exe	107
PID 4348 wrote to memory of 2312	4348	lbejnseb.exe	116
PID 4348 wrote to memory of 2312	4348	lbejnseb.exe	116
PID 4348 wrote to memory of 2312	4348	lbejnseb.exe	116
PID 4348 wrote to memory of 2312	4348	lbejnseb.exe	116
PID 4348 wrote to memory of 2312	4348	lbejnseb.exe	116

C:\Users\Admin\AppData\Local\Temp\16bcbac323177a8dc675842da7a747b5.exe
"C:\Users\Admin\AppData\Local\Temp\16bcbac323177a8dc675842da7a747b5.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:712
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jenxzrhg\
  2⤵
  PID:1044
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lbejnseb.exe" C:\Windows\SysWOW64\jenxzrhg\
  2⤵
  PID:1392
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create jenxzrhg binPath= "C:\Windows\SysWOW64\jenxzrhg\lbejnseb.exe /d\"C:\Users\Admin\AppData\Local\Temp\16bcbac323177a8dc675842da7a747b5.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:3224
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description jenxzrhg "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4188
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start jenxzrhg
  2⤵
  - Launches sc.exe
  PID:4552
- 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
  PID:392
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 712 -s 1292
  2⤵
  - Program crash
  PID:1076

C:\Windows\SysWOW64\jenxzrhg\lbejnseb.exe
C:\Windows\SysWOW64\jenxzrhg\lbejnseb.exe /d"C:\Users\Admin\AppData\Local\Temp\16bcbac323177a8dc675842da7a747b5.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4348
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:2312
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4348 -s 516
  2⤵
  - Program crash
  PID:3496

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 712 -ip 712
1⤵
PID:4180

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 4348 -ip 4348
1⤵
PID:3200

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

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

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

lbejnseb.exe

Path C:\Users\Admin\AppData\Local\Temp\lbejnseb.exe
Size 7.3MB
SHA256 af90fd695d860369fb983ce260166ef4468a17344b76f2f938414223b4a50145
MD5 b8696c989aed0ebbcd91471aa206d467
SHA1 63d583776e091b591980be87e9a1a5580d62cd0a
SHA512 c43a0cf229632aa8d925e802096aabb45aba7940e1344d0c36f12321ca435ef1b080f8a7b7bc304c8d222edb1ae5830cd1832c7bc88d6dc884a915dd1a1ea8c6
SSDEEP 6144:8daQnsbMlI3TiGnvGwJm6DwURRTzoVvaEZ7+XgJ1cPBQD79VVVVVVVVVVVVVVVVT:8dVi3TiGnvGlULRRTzoBaq+XcsyDl
MD5 SHA1 SHA512 SSDEEP

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lbejnseb.exe

Path C:\Windows\SysWOW64\jenxzrhg\lbejnseb.exe
Size 1.2MB
SHA256 a70b9432dc75738d3f5247e6a8081b50f4eba9086b4ffdc37751ff74313e09d9
MD5 201336b13533dd14a228a0037db54799
SHA1 3cc3850199813c223f62305ffb2b00a32c7581cb
SHA512 01159669407477628a660d925b5917583f53c7a6feb361bb3aca9f3b26694d2e74607c36f8d8999888c989b61259b28f4554b5bec7224e022e6f99d70fe01cf5
SSDEEP 6144:8daQnsbMlI3TiGnvGwJm6DwURRTzoVvaEZ7+XgJ1cPBQD79VVVVVVVVVVVVVVVVX:8dVi3TiGnvGlULRRTzoBaq+XcsyDd
MD5 SHA1 SHA512 SSDEEP

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memory/712-8-0x00000000005B0000-0x00000000005C3000-memory.dmp

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memory/712-3-0x0000000000400000-0x0000000000457000-memory.dmp

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memory/712-2-0x00000000005B0000-0x00000000005C3000-memory.dmp

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memory/712-7-0x0000000000400000-0x0000000000457000-memory.dmp

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memory/712-1-0x00000000007B0000-0x00000000008B0000-memory.dmp

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memory/2312-12-0x0000000000F10000-0x0000000000F25000-memory.dmp

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memory/2312-16-0x0000000000F10000-0x0000000000F25000-memory.dmp

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memory/2312-17-0x0000000000F10000-0x0000000000F25000-memory.dmp

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memory/2312-19-0x0000000000F10000-0x0000000000F25000-memory.dmp

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memory/4348-10-0x0000000000510000-0x0000000000610000-memory.dmp

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memory/4348-11-0x0000000000400000-0x0000000000457000-memory.dmp

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memory/4348-18-0x0000000000400000-0x0000000000457000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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