tofsee | 9147b2e4d0e04f288700b09606af79a3fdab6b6e8e69495a8ef868481d544beb

Analysis

max time kernel
146s
max time network
140s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
29/05/2024, 10:17

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General

Target
8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe
Size 142KB
Sample240529-mbk5dsbc4x
SHA256 9147b2e4d0e04f288700b09606af79a3fdab6b6e8e69495a8ef868481d544beb
MD5 8066071ebc2261fb9fa7bc095950e7a4
SHA1 385ece42d14ed13dd1911bc78405448f2cc2c5d5
SHA512 3b6061ccbc73cc280412177f7569f0af13d14c75425998f043702d97ac33d880ca2d2a21f3fadfa46acb266e82b75d9e2f811122daab48e7dac080bc67fa1511
SSDEEP 3072:LO8/FLfg76rzTkYfiL2+jKfgi4m5nuGFU6W6WN06b37:B9pzwFLnKP46uC
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion execution persistence trojan

Malware Config

Extracted

Family

tofsee

43.231.4.7
lazystax.ru

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

pid	Process
1144	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\ssusjrvi\ImagePath = "C:\\Windows\\SysWOW64\\ssusjrvi\\trfrsnlr.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-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\International\Geo\Nation	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe

Deletes itself 1 IoCs

pid	Process
4348	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
972	trfrsnlr.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 972 set thread context of 4348	972	trfrsnlr.exe	99

Launches sc.exe 3 IoCs

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

pid	Process
3756	sc.exe
2532	sc.exe
2524	sc.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2212 wrote to memory of 4496	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	85
PID 2212 wrote to memory of 4496	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	85
PID 2212 wrote to memory of 4496	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	85
PID 2212 wrote to memory of 5080	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	88
PID 2212 wrote to memory of 5080	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	88
PID 2212 wrote to memory of 5080	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	88
PID 2212 wrote to memory of 2524	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	90
PID 2212 wrote to memory of 2524	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	90
PID 2212 wrote to memory of 2524	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	90
PID 2212 wrote to memory of 3756	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	92
PID 2212 wrote to memory of 3756	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	92
PID 2212 wrote to memory of 3756	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	92
PID 2212 wrote to memory of 2532	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	94
PID 2212 wrote to memory of 2532	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	94
PID 2212 wrote to memory of 2532	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	94
PID 2212 wrote to memory of 1144	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	97
PID 2212 wrote to memory of 1144	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	97
PID 2212 wrote to memory of 1144	2212	8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe	97
PID 972 wrote to memory of 4348	972	trfrsnlr.exe	99
PID 972 wrote to memory of 4348	972	trfrsnlr.exe	99
PID 972 wrote to memory of 4348	972	trfrsnlr.exe	99
PID 972 wrote to memory of 4348	972	trfrsnlr.exe	99
PID 972 wrote to memory of 4348	972	trfrsnlr.exe	99

C:\Users\Admin\AppData\Local\Temp\8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2212
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ssusjrvi\
  2⤵
  PID:4496
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\trfrsnlr.exe" C:\Windows\SysWOW64\ssusjrvi\
  2⤵
  PID:5080
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create ssusjrvi binPath= "C:\Windows\SysWOW64\ssusjrvi\trfrsnlr.exe /d\"C:\Users\Admin\AppData\Local\Temp\8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2524
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description ssusjrvi "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:3756
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start ssusjrvi
  2⤵
  - Launches sc.exe
  PID:2532
- 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:1144

C:\Windows\SysWOW64\ssusjrvi\trfrsnlr.exe
C:\Windows\SysWOW64\ssusjrvi\trfrsnlr.exe /d"C:\Users\Admin\AppData\Local\Temp\8066071ebc2261fb9fa7bc095950e7a4_JaffaCakes118.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:972
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:4348

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

T1569

Service Execution

T1569.002

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

trfrsnlr.exe

Path C:\Users\Admin\AppData\Local\Temp\trfrsnlr.exe
Size 11.1MB
SHA256 06f13042a539523cc4c57f2fcec94b4d12479500b0db8397ceda8bc01196fb43
MD5 a18c76087de2146a7286d1cf440221e9
SHA1 47b91e3a966db9df5f61e91756e7842c849c3dc5
SHA512 00cabbe8ab5070e74a7652b2ffea8eec14046bc72f1d254dc98bb980c2c85ce28a0d42efc6ab12d26ef480e54951f290c9a6527b0058a8b67b1c21ffba703378
SSDEEP 3072:VO8/FLfg76rzTkYfiL2+jKfgi4m5nuGFU6W6WN06b37////////////////////X:v9pzwFLnKP46uC
MD5 SHA1 SHA512 SSDEEP

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memory/972-7-0x0000000000580000-0x0000000000581000-memory.dmp

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memory/972-8-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/972-10-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/2212-0-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/2212-2-0x0000000000510000-0x0000000000511000-memory.dmp

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memory/2212-1-0x0000000000500000-0x0000000000501000-memory.dmp

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memory/2212-6-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/4348-9-0x00000000003E0000-0x00000000003F5000-memory.dmp

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memory/4348-12-0x00000000003E0000-0x00000000003F5000-memory.dmp

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memory/4348-13-0x00000000003E0000-0x00000000003F5000-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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