tofsee | 8d6d6e9a34683ac82b391d1725b233f7b4713978f6a3a528a2062425fb90f537

Analysis

max time kernel
142s
max time network
135s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
01/01/2024, 20:00

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General

Target

42447fa47634362aeff2746d2ad7fe43.exe
Size

11.4MB
MD5

42447fa47634362aeff2746d2ad7fe43
SHA1

e4c1aa0f40112f20e1f41f104d61a1ae265c29d4
SHA256

8d6d6e9a34683ac82b391d1725b233f7b4713978f6a3a528a2062425fb90f537
SHA512

5776f74befea8bbaa87495f57063bc417c7045f251d9f93aac59a10b9032210ccb7bea96dcf904c0ccc3528bb55c50d13451e5c58067aeb6b245d4195c2d3842
SSDEEP

49152:nGvEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE:nG

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\nvuxball = "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
2500	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\nvuxball\ImagePath = "C:\\Windows\\SysWOW64\\nvuxball\\asguihxr.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2508	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2720	asguihxr.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2720 set thread context of 2508	2720	asguihxr.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
2688	sc.exe
2684	sc.exe
2708	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 2436 wrote to memory of 2196	2436	42447fa47634362aeff2746d2ad7fe43.exe	28
PID 2436 wrote to memory of 2196	2436	42447fa47634362aeff2746d2ad7fe43.exe	28
PID 2436 wrote to memory of 2196	2436	42447fa47634362aeff2746d2ad7fe43.exe	28
PID 2436 wrote to memory of 2196	2436	42447fa47634362aeff2746d2ad7fe43.exe	28
PID 2436 wrote to memory of 3020	2436	42447fa47634362aeff2746d2ad7fe43.exe	30
PID 2436 wrote to memory of 3020	2436	42447fa47634362aeff2746d2ad7fe43.exe	30
PID 2436 wrote to memory of 3020	2436	42447fa47634362aeff2746d2ad7fe43.exe	30
PID 2436 wrote to memory of 3020	2436	42447fa47634362aeff2746d2ad7fe43.exe	30
PID 2436 wrote to memory of 2688	2436	42447fa47634362aeff2746d2ad7fe43.exe	32
PID 2436 wrote to memory of 2688	2436	42447fa47634362aeff2746d2ad7fe43.exe	32
PID 2436 wrote to memory of 2688	2436	42447fa47634362aeff2746d2ad7fe43.exe	32
PID 2436 wrote to memory of 2688	2436	42447fa47634362aeff2746d2ad7fe43.exe	32
PID 2436 wrote to memory of 2684	2436	42447fa47634362aeff2746d2ad7fe43.exe	34
PID 2436 wrote to memory of 2684	2436	42447fa47634362aeff2746d2ad7fe43.exe	34
PID 2436 wrote to memory of 2684	2436	42447fa47634362aeff2746d2ad7fe43.exe	34
PID 2436 wrote to memory of 2684	2436	42447fa47634362aeff2746d2ad7fe43.exe	34
PID 2436 wrote to memory of 2708	2436	42447fa47634362aeff2746d2ad7fe43.exe	36
PID 2436 wrote to memory of 2708	2436	42447fa47634362aeff2746d2ad7fe43.exe	36
PID 2436 wrote to memory of 2708	2436	42447fa47634362aeff2746d2ad7fe43.exe	36
PID 2436 wrote to memory of 2708	2436	42447fa47634362aeff2746d2ad7fe43.exe	36
PID 2436 wrote to memory of 2500	2436	42447fa47634362aeff2746d2ad7fe43.exe	39
PID 2436 wrote to memory of 2500	2436	42447fa47634362aeff2746d2ad7fe43.exe	39
PID 2436 wrote to memory of 2500	2436	42447fa47634362aeff2746d2ad7fe43.exe	39
PID 2436 wrote to memory of 2500	2436	42447fa47634362aeff2746d2ad7fe43.exe	39
PID 2720 wrote to memory of 2508	2720	asguihxr.exe	41
PID 2720 wrote to memory of 2508	2720	asguihxr.exe	41
PID 2720 wrote to memory of 2508	2720	asguihxr.exe	41
PID 2720 wrote to memory of 2508	2720	asguihxr.exe	41
PID 2720 wrote to memory of 2508	2720	asguihxr.exe	41
PID 2720 wrote to memory of 2508	2720	asguihxr.exe	41

C:\Users\Admin\AppData\Local\Temp\42447fa47634362aeff2746d2ad7fe43.exe
"C:\Users\Admin\AppData\Local\Temp\42447fa47634362aeff2746d2ad7fe43.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2436
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nvuxball\
  2⤵
  PID:2196
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\asguihxr.exe" C:\Windows\SysWOW64\nvuxball\
  2⤵
  PID:3020
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create nvuxball binPath= "C:\Windows\SysWOW64\nvuxball\asguihxr.exe /d\"C:\Users\Admin\AppData\Local\Temp\42447fa47634362aeff2746d2ad7fe43.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2688
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description nvuxball "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2684
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start nvuxball
  2⤵
  - Launches sc.exe
  PID:2708
- 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:2500

C:\Windows\SysWOW64\nvuxball\asguihxr.exe
C:\Windows\SysWOW64\nvuxball\asguihxr.exe /d"C:\Users\Admin\AppData\Local\Temp\42447fa47634362aeff2746d2ad7fe43.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2720
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:2508

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\asguihxr.exe

Filesize
14.1MB

MD5
3c8ab9cdf5333b9d814d7c9ceaf42c59

SHA1
3c8742e4dac0a1086d0fc23fe5e668db4fe32804

SHA256
a2111e7a49a0d26f462c23222b06ef3e24013f63c3d6631a0b729acd3b0fb2a7

SHA512
d1aa868784d5b5adc180d92c62e67eda3fe2e66097dac8a56bfb5bbfd944ad4f6f5366c69b1fb54693b50580cef9b4c51d9d4e78ff24c112ca9ae560cdbb301a

Download Submit
C:\Windows\SysWOW64\nvuxball\asguihxr.exe

Filesize
768KB

MD5
0422023c6e8bfeda91f112cc18de8bb3

SHA1
1928851e434cb8ee12da6f1ff1ab561578d65899

SHA256
8098c6e961d7343922b1dc5bbe8d9076f6080724aea838f7c5db7dd23dac8556

SHA512
23f364467d20623cbe966fca960e7a9316610829e7d2ae1d8366af480a5e48b059d5c96f9ba68d748914ca5f12d626bd42663c67e8c7d4ea9f2e29c5be511475

Download Submit
memory/2436-1-0x0000000000CD0000-0x0000000000DD0000-memory.dmp

Filesize
1024KB

Download
memory/2436-2-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2436-4-0x0000000000400000-0x0000000000C14000-memory.dmp

Filesize
8.1MB

Download
memory/2436-7-0x0000000000400000-0x0000000000C14000-memory.dmp

Filesize
8.1MB

Download
memory/2436-8-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2508-12-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2508-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2508-15-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2508-20-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2508-21-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2508-22-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2720-10-0x0000000000C90000-0x0000000000D90000-memory.dmp

Filesize
1024KB

Download
memory/2720-11-0x0000000000400000-0x0000000000C14000-memory.dmp

Filesize
8.1MB

Download
memory/2720-18-0x0000000000400000-0x0000000000C14000-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