tofsee | 0bd0d596230aa3958d9f54bd43d3de94685dd9f7ed3e8bd0b5c1a01d48d7e34e

Analysis

max time kernel
143s
max time network
136s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
25/12/2023, 07:55

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General

Target

106162a9e72052611f27b255db7a5d53.exe
Size

10.7MB
MD5

106162a9e72052611f27b255db7a5d53
SHA1

b2c8f9a1c6cd769bdad4d45b3e340b28e0bb2092
SHA256

0bd0d596230aa3958d9f54bd43d3de94685dd9f7ed3e8bd0b5c1a01d48d7e34e
SHA512

0b5966e406ba6c3d861e5b982a539a51c836a8fb08fd1c9295f17c108d29ae72ad687689eadb9fe3540924afab949598dd6f2108f7498d79edffa2a93a7b9ec9
SSDEEP

49152:3nHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH:3

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

43.231.4.6

lazystax.ru

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\cyuenvsv = "0"	svchost.exe

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
2796	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\cyuenvsv\ImagePath = "C:\\Windows\\SysWOW64\\cyuenvsv\\vvwekfht.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2068	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2540	vvwekfht.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2540 set thread context of 2068	2540	vvwekfht.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
2784	sc.exe
2812	sc.exe
2828	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 30 IoCs

description	pid	Process	procid_target
PID 1728 wrote to memory of 2680	1728	106162a9e72052611f27b255db7a5d53.exe	28
PID 1728 wrote to memory of 2680	1728	106162a9e72052611f27b255db7a5d53.exe	28
PID 1728 wrote to memory of 2680	1728	106162a9e72052611f27b255db7a5d53.exe	28
PID 1728 wrote to memory of 2680	1728	106162a9e72052611f27b255db7a5d53.exe	28
PID 1728 wrote to memory of 2688	1728	106162a9e72052611f27b255db7a5d53.exe	30
PID 1728 wrote to memory of 2688	1728	106162a9e72052611f27b255db7a5d53.exe	30
PID 1728 wrote to memory of 2688	1728	106162a9e72052611f27b255db7a5d53.exe	30
PID 1728 wrote to memory of 2688	1728	106162a9e72052611f27b255db7a5d53.exe	30
PID 1728 wrote to memory of 2784	1728	106162a9e72052611f27b255db7a5d53.exe	32
PID 1728 wrote to memory of 2784	1728	106162a9e72052611f27b255db7a5d53.exe	32
PID 1728 wrote to memory of 2784	1728	106162a9e72052611f27b255db7a5d53.exe	32
PID 1728 wrote to memory of 2784	1728	106162a9e72052611f27b255db7a5d53.exe	32
PID 1728 wrote to memory of 2812	1728	106162a9e72052611f27b255db7a5d53.exe	34
PID 1728 wrote to memory of 2812	1728	106162a9e72052611f27b255db7a5d53.exe	34
PID 1728 wrote to memory of 2812	1728	106162a9e72052611f27b255db7a5d53.exe	34
PID 1728 wrote to memory of 2812	1728	106162a9e72052611f27b255db7a5d53.exe	34
PID 1728 wrote to memory of 2828	1728	106162a9e72052611f27b255db7a5d53.exe	36
PID 1728 wrote to memory of 2828	1728	106162a9e72052611f27b255db7a5d53.exe	36
PID 1728 wrote to memory of 2828	1728	106162a9e72052611f27b255db7a5d53.exe	36
PID 1728 wrote to memory of 2828	1728	106162a9e72052611f27b255db7a5d53.exe	36
PID 1728 wrote to memory of 2796	1728	106162a9e72052611f27b255db7a5d53.exe	38
PID 1728 wrote to memory of 2796	1728	106162a9e72052611f27b255db7a5d53.exe	38
PID 1728 wrote to memory of 2796	1728	106162a9e72052611f27b255db7a5d53.exe	38
PID 1728 wrote to memory of 2796	1728	106162a9e72052611f27b255db7a5d53.exe	38
PID 2540 wrote to memory of 2068	2540	vvwekfht.exe	41
PID 2540 wrote to memory of 2068	2540	vvwekfht.exe	41
PID 2540 wrote to memory of 2068	2540	vvwekfht.exe	41
PID 2540 wrote to memory of 2068	2540	vvwekfht.exe	41
PID 2540 wrote to memory of 2068	2540	vvwekfht.exe	41
PID 2540 wrote to memory of 2068	2540	vvwekfht.exe	41

C:\Users\Admin\AppData\Local\Temp\106162a9e72052611f27b255db7a5d53.exe
"C:\Users\Admin\AppData\Local\Temp\106162a9e72052611f27b255db7a5d53.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1728
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cyuenvsv\
  2⤵
  PID:2680
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vvwekfht.exe" C:\Windows\SysWOW64\cyuenvsv\
  2⤵
  PID:2688
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create cyuenvsv binPath= "C:\Windows\SysWOW64\cyuenvsv\vvwekfht.exe /d\"C:\Users\Admin\AppData\Local\Temp\106162a9e72052611f27b255db7a5d53.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2784
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description cyuenvsv "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2812
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start cyuenvsv
  2⤵
  - Launches sc.exe
  PID:2828
- 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:2796

C:\Windows\SysWOW64\cyuenvsv\vvwekfht.exe
C:\Windows\SysWOW64\cyuenvsv\vvwekfht.exe /d"C:\Users\Admin\AppData\Local\Temp\106162a9e72052611f27b255db7a5d53.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2540
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:2068

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 Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\vvwekfht.exe

Filesize
13.7MB

MD5
b8e797913e6a9619746b1a94d215124d

SHA1
6102d4a92d472708b6460a056a91d74c6b0032b8

SHA256
c9b40eeff470f9f265a52f5c4fe5790060f04b1b5b54c49728da02d0bf2ddf21

SHA512
2ac04353197e60f9f7ecdb0afc8b34d4ef44c92e7155a7695fd0435806304aa99e463d91409d9ce8752f11561da15fd97ef35ac0204a04c005b06d0ab1edd071

Download Submit
memory/1728-1-0x0000000000D00000-0x0000000000E00000-memory.dmp

Filesize
1024KB

Download
memory/1728-2-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1728-4-0x0000000000400000-0x0000000000C14000-memory.dmp

Filesize
8.1MB

Download
memory/1728-6-0x0000000000400000-0x0000000000C14000-memory.dmp

Filesize
8.1MB

Download
memory/1728-7-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2068-11-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2068-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2068-15-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2068-20-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2068-21-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2068-22-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2540-10-0x0000000000CD0000-0x0000000000DD0000-memory.dmp

Filesize
1024KB

Download
memory/2540-13-0x0000000000400000-0x0000000000C14000-memory.dmp

Filesize
8.1MB

Download
memory/2540-17-0x0000000000400000-0x0000000000C14000-memory.dmp

Filesize
8.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads