tofsee | ea8ca76b2aef52390b22087b4535723f4f11f82911bd78a7ed1bd6cfbdd46d8b

Analysis

max time kernel
146s
max time network
146s
platform
windows10-2004_x64
resource
win10v2004-20240412-en
resource tags

arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
submitted
19/04/2024, 02:17

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General

Target
f9496c106987b667046b3895dea478e6_JaffaCakes118.exe
Size 13.0MB
Sample240419-cq46psfb4s
SHA256 ea8ca76b2aef52390b22087b4535723f4f11f82911bd78a7ed1bd6cfbdd46d8b
MD5 f9496c106987b667046b3895dea478e6
SHA1 569bf8c79ad8488eb03343929118a52a223f8296
SHA512 8ef9534565f25f5a84a37fbd4af6ee94a0d4c643b3c80481818d07645c2d4f632a325e05ae2156b118fc2315431057a988d39055ad5e2121b0fefaa1a1556f70
SSDEEP 12288:3l5qOcvT9o+egMU+HoWfprc0sssssssssssssssssssssssssssssssssssssss:xcvT9ofeqrc
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence 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) 1 TTPs
persistence

Windows Service
T1543.003

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
1696	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\yhvivwpp\ImagePath = "C:\\Windows\\SysWOW64\\yhvivwpp\\rrkxjgfh.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-1-5-21-2288054676-1871194608-3559553667-1000\Control Panel\International\Geo\Nation	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe

Deletes itself 1 IoCs

pid	Process
4296	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
676	rrkxjgfh.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 676 set thread context of 4296	676	rrkxjgfh.exe	107

Launches sc.exe 3 IoCs

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

pid	Process
3504	sc.exe
728	sc.exe
2560	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
3536	1672	WerFault.exe	83
1320	676	WerFault.exe	102

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1672 wrote to memory of 4956	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	87
PID 1672 wrote to memory of 4956	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	87
PID 1672 wrote to memory of 4956	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	87
PID 1672 wrote to memory of 3780	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	91
PID 1672 wrote to memory of 3780	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	91
PID 1672 wrote to memory of 3780	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	91
PID 1672 wrote to memory of 728	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	94
PID 1672 wrote to memory of 728	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	94
PID 1672 wrote to memory of 728	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	94
PID 1672 wrote to memory of 2560	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	98
PID 1672 wrote to memory of 2560	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	98
PID 1672 wrote to memory of 2560	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	98
PID 1672 wrote to memory of 3504	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	100
PID 1672 wrote to memory of 3504	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	100
PID 1672 wrote to memory of 3504	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	100
PID 1672 wrote to memory of 1696	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	103
PID 1672 wrote to memory of 1696	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	103
PID 1672 wrote to memory of 1696	1672	f9496c106987b667046b3895dea478e6_JaffaCakes118.exe	103
PID 676 wrote to memory of 4296	676	rrkxjgfh.exe	107
PID 676 wrote to memory of 4296	676	rrkxjgfh.exe	107
PID 676 wrote to memory of 4296	676	rrkxjgfh.exe	107
PID 676 wrote to memory of 4296	676	rrkxjgfh.exe	107
PID 676 wrote to memory of 4296	676	rrkxjgfh.exe	107

C:\Users\Admin\AppData\Local\Temp\f9496c106987b667046b3895dea478e6_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\f9496c106987b667046b3895dea478e6_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1672
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yhvivwpp\
  2⤵
  PID:4956
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rrkxjgfh.exe" C:\Windows\SysWOW64\yhvivwpp\
  2⤵
  PID:3780
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create yhvivwpp binPath= "C:\Windows\SysWOW64\yhvivwpp\rrkxjgfh.exe /d\"C:\Users\Admin\AppData\Local\Temp\f9496c106987b667046b3895dea478e6_JaffaCakes118.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:728
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description yhvivwpp "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2560
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start yhvivwpp
  2⤵
  - Launches sc.exe
  PID:3504
- 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:1696
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1672 -s 1036
  2⤵
  - Program crash
  PID:3536

C:\Windows\SysWOW64\yhvivwpp\rrkxjgfh.exe
C:\Windows\SysWOW64\yhvivwpp\rrkxjgfh.exe /d"C:\Users\Admin\AppData\Local\Temp\f9496c106987b667046b3895dea478e6_JaffaCakes118.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:676
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:4296
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 248
  2⤵
  - Program crash
  PID:1320

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1672 -ip 1672
1⤵
PID:3880

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 676 -ip 676
1⤵
PID:2396

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

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

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

rrkxjgfh.exe

Path C:\Users\Admin\AppData\Local\Temp\rrkxjgfh.exe
Size 15.0MB
SHA256 0c53f75e1e78267671a50b05df370b075b0aa9b2d802007e7676f1cedbccfb24
MD5 4fbfa6c247caee7b70e164aab6f48d54
SHA1 83385a790e9c65260098595386a4221c30b97014
SHA512 4f07ff193ef3103e94b4af02b8f1c1a9625cb5bbf3357d768703c033b90ad04012812bf4f245d1d55286603cb3352db4482e4020bba874ade8f34a17946aec12
SSDEEP 12288:Xl5qOcvT9o+egMU+HoWfprc0sssssssssssssssssssssssssssssssssssssss7:RcvT9ofeqrc
MD5 SHA1 SHA512 SSDEEP

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memory/676-10-0x00000000007E0000-0x00000000008E0000-memory.dmp

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memory/676-11-0x0000000000400000-0x000000000046D000-memory.dmp

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memory/676-18-0x0000000000400000-0x000000000046D000-memory.dmp

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memory/1672-4-0x0000000000400000-0x000000000046D000-memory.dmp

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memory/1672-2-0x00000000021B0000-0x00000000021C3000-memory.dmp

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memory/1672-8-0x0000000000400000-0x000000000046D000-memory.dmp

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memory/1672-9-0x00000000021B0000-0x00000000021C3000-memory.dmp

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memory/1672-1-0x0000000000590000-0x0000000000690000-memory.dmp

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memory/4296-12-0x0000000000480000-0x0000000000495000-memory.dmp

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memory/4296-16-0x0000000000480000-0x0000000000495000-memory.dmp

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memory/4296-17-0x0000000000480000-0x0000000000495000-memory.dmp

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memory/4296-19-0x0000000000480000-0x0000000000495000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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