tofsee | 2884a53e3ce2baf57ae5bbdc7fa1a5130e6932bd7b1c79576cf7131107e4fe06

Analysis

max time kernel
151s
max time network
157s
platform
windows10-2004_x64
resource
win10v2004-20240319-en
resource tags

arch:x64arch:x86image:win10v2004-20240319-enlocale:en-usos:windows10-2004-x64system
submitted
27/03/2024, 12:04

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General

Target
e19fbdc90f922c54a045d137336d702f.exe
Size 13.4MB
Sample240327-n8ngfsbf45
SHA256 2884a53e3ce2baf57ae5bbdc7fa1a5130e6932bd7b1c79576cf7131107e4fe06
MD5 e19fbdc90f922c54a045d137336d702f
SHA1 7490929f5de915568ea036a7edee8740e38f1c32
SHA512 5559252288953f7e663e18f8746298915c6f033dcf42538ada77dc9ae42cc4930249740bd888f17ad7e87b9faa3ff3d71d9478193195a83203bff4935e3df531
SSDEEP 49152:s88888888888888888888888888888888888888888888888888888888888888:
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
4240	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\cructtzp\ImagePath = "C:\\Windows\\SysWOW64\\cructtzp\\avkuzewu.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-1-5-21-817259280-2658881748-983986378-1000\Control Panel\International\Geo\Nation	e19fbdc90f922c54a045d137336d702f.exe

Deletes itself 1 IoCs

pid	Process
4532	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4908	avkuzewu.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4908 set thread context of 4532	4908	avkuzewu.exe	120

Launches sc.exe 3 IoCs

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

pid	Process
32	sc.exe
4420	sc.exe
2036	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
4188	4876	WerFault.exe	93
4384	4908	WerFault.exe	111

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4876 wrote to memory of 4068	4876	e19fbdc90f922c54a045d137336d702f.exe	99
PID 4876 wrote to memory of 4068	4876	e19fbdc90f922c54a045d137336d702f.exe	99
PID 4876 wrote to memory of 4068	4876	e19fbdc90f922c54a045d137336d702f.exe	99
PID 4876 wrote to memory of 3332	4876	e19fbdc90f922c54a045d137336d702f.exe	102
PID 4876 wrote to memory of 3332	4876	e19fbdc90f922c54a045d137336d702f.exe	102
PID 4876 wrote to memory of 3332	4876	e19fbdc90f922c54a045d137336d702f.exe	102
PID 4876 wrote to memory of 32	4876	e19fbdc90f922c54a045d137336d702f.exe	105
PID 4876 wrote to memory of 32	4876	e19fbdc90f922c54a045d137336d702f.exe	105
PID 4876 wrote to memory of 32	4876	e19fbdc90f922c54a045d137336d702f.exe	105
PID 4876 wrote to memory of 4420	4876	e19fbdc90f922c54a045d137336d702f.exe	107
PID 4876 wrote to memory of 4420	4876	e19fbdc90f922c54a045d137336d702f.exe	107
PID 4876 wrote to memory of 4420	4876	e19fbdc90f922c54a045d137336d702f.exe	107
PID 4876 wrote to memory of 2036	4876	e19fbdc90f922c54a045d137336d702f.exe	109
PID 4876 wrote to memory of 2036	4876	e19fbdc90f922c54a045d137336d702f.exe	109
PID 4876 wrote to memory of 2036	4876	e19fbdc90f922c54a045d137336d702f.exe	109
PID 4876 wrote to memory of 4240	4876	e19fbdc90f922c54a045d137336d702f.exe	112
PID 4876 wrote to memory of 4240	4876	e19fbdc90f922c54a045d137336d702f.exe	112
PID 4876 wrote to memory of 4240	4876	e19fbdc90f922c54a045d137336d702f.exe	112
PID 4908 wrote to memory of 4532	4908	avkuzewu.exe	120
PID 4908 wrote to memory of 4532	4908	avkuzewu.exe	120
PID 4908 wrote to memory of 4532	4908	avkuzewu.exe	120
PID 4908 wrote to memory of 4532	4908	avkuzewu.exe	120
PID 4908 wrote to memory of 4532	4908	avkuzewu.exe	120

C:\Users\Admin\AppData\Local\Temp\e19fbdc90f922c54a045d137336d702f.exe
"C:\Users\Admin\AppData\Local\Temp\e19fbdc90f922c54a045d137336d702f.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4876
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cructtzp\
  2⤵
  PID:4068
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\avkuzewu.exe" C:\Windows\SysWOW64\cructtzp\
  2⤵
  PID:3332
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create cructtzp binPath= "C:\Windows\SysWOW64\cructtzp\avkuzewu.exe /d\"C:\Users\Admin\AppData\Local\Temp\e19fbdc90f922c54a045d137336d702f.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:32
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description cructtzp "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4420
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start cructtzp
  2⤵
  - Launches sc.exe
  PID:2036
- 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:4240
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4876 -s 1280
  2⤵
  - Program crash
  PID:4188

C:\Windows\SysWOW64\cructtzp\avkuzewu.exe
C:\Windows\SysWOW64\cructtzp\avkuzewu.exe /d"C:\Users\Admin\AppData\Local\Temp\e19fbdc90f922c54a045d137336d702f.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4908
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:4532
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4908 -s 524
  2⤵
  - Program crash
  PID:4384

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4876 -ip 4876
1⤵
PID:3620

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 4908 -ip 4908
1⤵
PID:2548

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3760 --field-trial-handle=2264,i,1475924722205134884,16549311107360026087,262144 --variations-seed-version /prefetch:8
1⤵
PID:4756

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

avkuzewu.exe

Path C:\Users\Admin\AppData\Local\Temp\avkuzewu.exe
Size 1.2MB
SHA256 99174147c4e5c11036ab4413f0dd539bbec65e4974f3a713dd1ce7a55f25fbef
MD5 dbc428269ec5341f27a38fb0e3797a95
SHA1 a6e8427d77a72eeec1d3eb1140557b2bd4b6eb50
SHA512 1d1da247417883122d1547d634c3f9facb9a07ccca6eb4c3dc59a774021bd81654d7a0a336e9b4c5a2615ddeae97aae0c0a32de986fab94375bc19a3faa04c2f
SSDEEP 12288:tNO88888888888888888888888888888:288888888888888888888888888888
MD5 SHA1 SHA512 SSDEEP

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avkuzewu.exe

Path C:\Windows\SysWOW64\cructtzp\avkuzewu.exe
Size 12.9MB
SHA256 738ee4172be3c78f806b6cd7005404da852ce4c1e84626a50b05e0b45b1738ce
MD5 cbd467f4ba417a22e87bd3b8d1a5514e
SHA1 5d505779403b744f9e7a96c62c3f8a5a2ef31354
SHA512 79f6c396b667ec312774b007548c82dcecfa5939133b5bbafd94be68c2eaf12d5f2e7eda03af6091ebd240045517c73dfbc852860befa5533a457421b8ebd7d5
SSDEEP 49152:2888888888888888888888888888888888888888888888888888888888888887:
MD5 SHA1 SHA512 SSDEEP

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memory/4532-14-0x0000000000720000-0x0000000000735000-memory.dmp

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memory/4532-11-0x0000000000720000-0x0000000000735000-memory.dmp

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memory/4532-16-0x0000000000720000-0x0000000000735000-memory.dmp

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memory/4532-19-0x0000000000720000-0x0000000000735000-memory.dmp

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memory/4532-20-0x0000000000720000-0x0000000000735000-memory.dmp

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memory/4876-4-0x0000000000400000-0x0000000002C68000-memory.dmp

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memory/4876-2-0x0000000004880000-0x0000000004893000-memory.dmp

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memory/4876-8-0x0000000000400000-0x0000000002C68000-memory.dmp

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memory/4876-9-0x0000000004880000-0x0000000004893000-memory.dmp

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memory/4876-1-0x0000000002DE0000-0x0000000002EE0000-memory.dmp

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memory/4908-10-0x0000000002DB0000-0x0000000002EB0000-memory.dmp

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memory/4908-17-0x0000000000400000-0x0000000002C68000-memory.dmp

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memory/4908-15-0x0000000000400000-0x0000000002C68000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads