tofsee | 2657ffa6aa25d3deef2f9d75955d5a16c9930d32e5a0f8da8ed448d7bb9448cd

Analysis

max time kernel
141s
max time network
149s
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, 03:32

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General

Target
0d0f825f1e0f5124cc5543276d6c140d.exe
Size 13.3MB
Sample231230-d3zmesfcd4
SHA256 2657ffa6aa25d3deef2f9d75955d5a16c9930d32e5a0f8da8ed448d7bb9448cd
MD5 0d0f825f1e0f5124cc5543276d6c140d
SHA1 b8529471a54f3527564277a46d7a800fd870b661
SHA512 81db9556296ef3142a7674adbad7b1240255d818dcbcb8564dab37d051600266fcd7339a8281e6ae3e8dae7405d92c611b95b1094b177fef53b73b3ae4718f72
SSDEEP 98304:lNWUlllllllllllllllllllllllllllllllllllllllllllllllllllllllllllR:jW
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion 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) 1 TTPs
persistence

Windows Service
T1543.003

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Windows Service

T1543.003

pid	Process
4968	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\wdyvcvnk\ImagePath = "C:\\Windows\\SysWOW64\\wdyvcvnk\\hjcnucqg.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-1-5-21-3791175113-1062217823-1177695025-1000\Control Panel\International\Geo\Nation	0d0f825f1e0f5124cc5543276d6c140d.exe

Deletes itself 1 IoCs

pid	Process
1492	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4628	hjcnucqg.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4628 set thread context of 1492	4628	hjcnucqg.exe	104

Launches sc.exe 3 IoCs

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

pid	Process
4028	sc.exe
1564	sc.exe
2608	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 4652 wrote to memory of 4496	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	92
PID 4652 wrote to memory of 4496	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	92
PID 4652 wrote to memory of 4496	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	92
PID 4652 wrote to memory of 4844	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	94
PID 4652 wrote to memory of 4844	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	94
PID 4652 wrote to memory of 4844	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	94
PID 4652 wrote to memory of 4028	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	95
PID 4652 wrote to memory of 4028	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	95
PID 4652 wrote to memory of 4028	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	95
PID 4652 wrote to memory of 1564	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	98
PID 4652 wrote to memory of 1564	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	98
PID 4652 wrote to memory of 1564	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	98
PID 4652 wrote to memory of 2608	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	100
PID 4652 wrote to memory of 2608	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	100
PID 4652 wrote to memory of 2608	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	100
PID 4652 wrote to memory of 4968	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	103
PID 4652 wrote to memory of 4968	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	103
PID 4652 wrote to memory of 4968	4652	0d0f825f1e0f5124cc5543276d6c140d.exe	103
PID 4628 wrote to memory of 1492	4628	hjcnucqg.exe	104
PID 4628 wrote to memory of 1492	4628	hjcnucqg.exe	104
PID 4628 wrote to memory of 1492	4628	hjcnucqg.exe	104
PID 4628 wrote to memory of 1492	4628	hjcnucqg.exe	104
PID 4628 wrote to memory of 1492	4628	hjcnucqg.exe	104

C:\Users\Admin\AppData\Local\Temp\0d0f825f1e0f5124cc5543276d6c140d.exe
"C:\Users\Admin\AppData\Local\Temp\0d0f825f1e0f5124cc5543276d6c140d.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4652
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wdyvcvnk\
  2⤵
  PID:4496
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hjcnucqg.exe" C:\Windows\SysWOW64\wdyvcvnk\
  2⤵
  PID:4844
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create wdyvcvnk binPath= "C:\Windows\SysWOW64\wdyvcvnk\hjcnucqg.exe /d\"C:\Users\Admin\AppData\Local\Temp\0d0f825f1e0f5124cc5543276d6c140d.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4028
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description wdyvcvnk "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1564
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start wdyvcvnk
  2⤵
  - Launches sc.exe
  PID:2608
- 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:4968

C:\Windows\SysWOW64\wdyvcvnk\hjcnucqg.exe
C:\Windows\SysWOW64\wdyvcvnk\hjcnucqg.exe /d"C:\Users\Admin\AppData\Local\Temp\0d0f825f1e0f5124cc5543276d6c140d.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4628
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:1492

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

hjcnucqg.exe

Path C:\Users\Admin\AppData\Local\Temp\hjcnucqg.exe
Size 321KB
SHA256 6b2c61c77e5ed513f90bf26e04018fe7a9544a9c1f58e33c42766ab2ac8131db
MD5 4ac51fc0a7b909ce0edc1370ed30d006
SHA1 ced83882493f465492b964c73955355ef6f617f0
SHA512 b1c97cac3efeede2beb7957238dd775691a9fc91ecc3e85ce905314d26de0860daa451bd65196d2cf50204c3dd0d0b9a6c3600e9b4c1a6ae5f115d5d99e5474e
SSDEEP 6144:Ug1YKZ3YZZeZZeFYg94lllllllllllll:Ug1dZoZmeh2lllllllllllll
MD5 SHA1 SHA512 SSDEEP

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hjcnucqg.exe

Path C:\Windows\SysWOW64\wdyvcvnk\hjcnucqg.exe
Size 386KB
SHA256 c07127a5202691df52d001faf7eda498a14fe51ba0d801238924b5645aef0883
MD5 75f13457c9fa0eeff1a627cc5f123814
SHA1 161a42a9fa30c442727bdcc3d8b94286542accf3
SHA512 7f05ea4e7e20623e6153fca422a59fb2877f14bde5a1d25a73468472bd03180557014a0e591df530b96badfdfc0561c93898b0206e3c43521f54b5c7be6c124a
SSDEEP 6144:Ug1YKZ3YZZeZZeFYg94llllllllllllllllll:Ug1dZoZmeh2llllllllllllllllll
MD5 SHA1 SHA512 SSDEEP

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memory/1492-14-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

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memory/1492-11-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

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memory/1492-17-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

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memory/1492-18-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

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memory/4628-15-0x0000000000400000-0x00000000036CD000-memory.dmp

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memory/4628-10-0x0000000003820000-0x0000000003920000-memory.dmp

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memory/4628-16-0x0000000000400000-0x00000000036CD000-memory.dmp

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memory/4652-4-0x0000000000400000-0x00000000036CD000-memory.dmp

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memory/4652-2-0x0000000005410000-0x0000000005423000-memory.dmp

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memory/4652-7-0x0000000000400000-0x00000000036CD000-memory.dmp

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memory/4652-8-0x0000000005410000-0x0000000005423000-memory.dmp

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memory/4652-1-0x00000000038F0000-0x00000000039F0000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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