tofsee | a5c7112ff3e20b3f66cad4ceaa8c395dc157a94fad24d5aed5202d53c6714306

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
03/04/2024, 22:23

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General

Target
a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe
Size 10.2MB
Sample240403-2ayfnafa76
SHA256 a5c7112ff3e20b3f66cad4ceaa8c395dc157a94fad24d5aed5202d53c6714306
MD5 a841a4cf146be49d8368cb6b92aea1be
SHA1 482a1fbe8a24b61c095db3c32a8ee22534ed7af9
SHA512 d7122080cbb2fa84183030afb917e8407617c62291adde3048342fc9b38ec0b72d0ba38f224d81a1b18609ece5b63c3f3207ceaf1028b6e21f7a6be1cd3b03eb
SSDEEP 24576:U/FfqVdOBr70Fm0999999999999999999999999999999999999999999999999V:sFU
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

quadoil.ru
lakeflex.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 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
1292	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\bqerpjvp\ImagePath = "C:\\Windows\\SysWOW64\\bqerpjvp\\mrbrfk.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-1-5-21-3270530367-132075249-2153716227-1000\Control Panel\International\Geo\Nation	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe

Deletes itself 1 IoCs

pid	Process
924	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
5040	mrbrfk.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5040 set thread context of 924	5040	mrbrfk.exe	107

Launches sc.exe 3 IoCs

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

pid	Process
3048	sc.exe
4040	sc.exe
3544	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
376	4880	WerFault.exe	83
3308	5040	WerFault.exe	99

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4880 wrote to memory of 4388	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	87
PID 4880 wrote to memory of 4388	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	87
PID 4880 wrote to memory of 4388	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	87
PID 4880 wrote to memory of 3664	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	89
PID 4880 wrote to memory of 3664	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	89
PID 4880 wrote to memory of 3664	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	89
PID 4880 wrote to memory of 3048	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	91
PID 4880 wrote to memory of 3048	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	91
PID 4880 wrote to memory of 3048	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	91
PID 4880 wrote to memory of 4040	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	95
PID 4880 wrote to memory of 4040	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	95
PID 4880 wrote to memory of 4040	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	95
PID 4880 wrote to memory of 3544	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	97
PID 4880 wrote to memory of 3544	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	97
PID 4880 wrote to memory of 3544	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	97
PID 4880 wrote to memory of 1292	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	101
PID 4880 wrote to memory of 1292	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	101
PID 4880 wrote to memory of 1292	4880	a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe	101
PID 5040 wrote to memory of 924	5040	mrbrfk.exe	107
PID 5040 wrote to memory of 924	5040	mrbrfk.exe	107
PID 5040 wrote to memory of 924	5040	mrbrfk.exe	107
PID 5040 wrote to memory of 924	5040	mrbrfk.exe	107
PID 5040 wrote to memory of 924	5040	mrbrfk.exe	107

C:\Users\Admin\AppData\Local\Temp\a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4880
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bqerpjvp\
  2⤵
  PID:4388
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mrbrfk.exe" C:\Windows\SysWOW64\bqerpjvp\
  2⤵
  PID:3664
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create bqerpjvp binPath= "C:\Windows\SysWOW64\bqerpjvp\mrbrfk.exe /d\"C:\Users\Admin\AppData\Local\Temp\a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:3048
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description bqerpjvp "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4040
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start bqerpjvp
  2⤵
  - Launches sc.exe
  PID:3544
- 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:1292
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4880 -s 672
  2⤵
  - Program crash
  PID:376

C:\Windows\SysWOW64\bqerpjvp\mrbrfk.exe
C:\Windows\SysWOW64\bqerpjvp\mrbrfk.exe /d"C:\Users\Admin\AppData\Local\Temp\a841a4cf146be49d8368cb6b92aea1be_JaffaCakes118.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:5040
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:924
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5040 -s 516
  2⤵
  - Program crash
  PID:3308

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4880 -ip 4880
1⤵
PID:5004

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 5040 -ip 5040
1⤵
PID:2928

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

mrbrfk.exe

Path C:\Users\Admin\AppData\Local\Temp\mrbrfk.exe
Size 13.8MB
SHA256 2135e5e013348e3cfd04f3871067631a5004fd05d52cf24ef7e3a0b1eee7a3d6
MD5 981858fd8a1b30310e7c80f28d2048d5
SHA1 ec84e11cf3147e687282d764ac5d8b3ba3bc7852
SHA512 786a1d2ca6f6ec170e6300efafdad73e8f55d1f33ef92d43e4d23d8130a341ae33f2ffd2cff4b86778a9569c87298cad05cdd05432f6cee5bfadeb92cf834439
SSDEEP 24576:q/FfqVdOBr70Fm0999999999999999999999999999999999999999999999999v:eFU
MD5 SHA1 SHA512 SSDEEP

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memory/924-16-0x0000000000540000-0x0000000000555000-memory.dmp

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memory/924-12-0x0000000000540000-0x0000000000555000-memory.dmp

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memory/924-18-0x0000000000540000-0x0000000000555000-memory.dmp

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memory/924-19-0x0000000000540000-0x0000000000555000-memory.dmp

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memory/4880-4-0x0000000000400000-0x0000000000785000-memory.dmp

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memory/4880-2-0x0000000000930000-0x0000000000943000-memory.dmp

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memory/4880-8-0x0000000000400000-0x0000000000785000-memory.dmp

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memory/4880-9-0x0000000000930000-0x0000000000943000-memory.dmp

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memory/4880-1-0x0000000000950000-0x0000000000A50000-memory.dmp

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memory/5040-10-0x0000000000960000-0x0000000000A60000-memory.dmp

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memory/5040-11-0x0000000000400000-0x0000000000785000-memory.dmp

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memory/5040-17-0x0000000000400000-0x0000000000785000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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