tofsee | 961f5faa6835275d729394a3136e2a932540297fa9ccf7ced9f0bec24b191f39

Analysis

max time kernel
149s
max time network
146s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
15/03/2024, 19:15

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General

Target

cc35570f8a6ca5eaa3b157d5129cf642.exe
Size

12.0MB
MD5

cc35570f8a6ca5eaa3b157d5129cf642
SHA1

183c1a4dd86f9e96aba6020770de442ba1cab90f
SHA256

961f5faa6835275d729394a3136e2a932540297fa9ccf7ced9f0bec24b191f39
SHA512

638b4c36533d05b96b19f046899fcdc471efc58cd0893def3daa3d83d5c219fb8de67fd436cba3e22586b70a70e35ef7241cb042175c6f9555be52f2112bce58
SSDEEP

24576:9lxdvCcpOKCtBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBD:9lzOR

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

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\xnvewyno = "0"	svchost.exe

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
2704	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\xnvewyno\ImagePath = "C:\\Windows\\SysWOW64\\xnvewyno\\gkrvxaqc.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2428	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2548	gkrvxaqc.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2548 set thread context of 2428	2548	gkrvxaqc.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
2644	sc.exe
2660	sc.exe
2392	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 2156 wrote to memory of 2900	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	28
PID 2156 wrote to memory of 2900	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	28
PID 2156 wrote to memory of 2900	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	28
PID 2156 wrote to memory of 2900	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	28
PID 2156 wrote to memory of 3012	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	30
PID 2156 wrote to memory of 3012	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	30
PID 2156 wrote to memory of 3012	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	30
PID 2156 wrote to memory of 3012	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	30
PID 2156 wrote to memory of 2644	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	32
PID 2156 wrote to memory of 2644	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	32
PID 2156 wrote to memory of 2644	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	32
PID 2156 wrote to memory of 2644	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	32
PID 2156 wrote to memory of 2660	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	34
PID 2156 wrote to memory of 2660	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	34
PID 2156 wrote to memory of 2660	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	34
PID 2156 wrote to memory of 2660	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	34
PID 2156 wrote to memory of 2392	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	36
PID 2156 wrote to memory of 2392	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	36
PID 2156 wrote to memory of 2392	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	36
PID 2156 wrote to memory of 2392	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	36
PID 2156 wrote to memory of 2704	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	39
PID 2156 wrote to memory of 2704	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	39
PID 2156 wrote to memory of 2704	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	39
PID 2156 wrote to memory of 2704	2156	cc35570f8a6ca5eaa3b157d5129cf642.exe	39
PID 2548 wrote to memory of 2428	2548	gkrvxaqc.exe	41
PID 2548 wrote to memory of 2428	2548	gkrvxaqc.exe	41
PID 2548 wrote to memory of 2428	2548	gkrvxaqc.exe	41
PID 2548 wrote to memory of 2428	2548	gkrvxaqc.exe	41
PID 2548 wrote to memory of 2428	2548	gkrvxaqc.exe	41
PID 2548 wrote to memory of 2428	2548	gkrvxaqc.exe	41

C:\Users\Admin\AppData\Local\Temp\cc35570f8a6ca5eaa3b157d5129cf642.exe
"C:\Users\Admin\AppData\Local\Temp\cc35570f8a6ca5eaa3b157d5129cf642.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2156
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xnvewyno\
  2⤵
  PID:2900
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gkrvxaqc.exe" C:\Windows\SysWOW64\xnvewyno\
  2⤵
  PID:3012
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create xnvewyno binPath= "C:\Windows\SysWOW64\xnvewyno\gkrvxaqc.exe /d\"C:\Users\Admin\AppData\Local\Temp\cc35570f8a6ca5eaa3b157d5129cf642.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2644
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description xnvewyno "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2660
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start xnvewyno
  2⤵
  - Launches sc.exe
  PID:2392
- 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:2704

C:\Windows\SysWOW64\xnvewyno\gkrvxaqc.exe
C:\Windows\SysWOW64\xnvewyno\gkrvxaqc.exe /d"C:\Users\Admin\AppData\Local\Temp\cc35570f8a6ca5eaa3b157d5129cf642.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2548
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:2428

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

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\gkrvxaqc.exe

Filesize
12.1MB

MD5
4555d932ab22ae5ff7caeb2a1cf79e18

SHA1
7088d7fc047e57e6f6ab6e22ab81a6d94eb49e6a

SHA256
6384c6ef34b55e93b40fc036441af73e6130429dee62138cc2f556bc4ca664f5

SHA512
600864323db393262f162e38d2f371a121234ae0360c74c32a60053c718b0c82b176f7ea53eab506d19e61a10a0f0a7c4387a66cf94886e375ab28caf7171e7c

Download Submit
C:\Windows\SysWOW64\xnvewyno\gkrvxaqc.exe

Filesize
1.6MB

MD5
db8c452cded2a0a0ce979a2ffb6edb9b

SHA1
174f8269cc6bd95b38d3968a7dea5aee4f706530

SHA256
42e4c523e4a816db8199b5b9b1bc7725ca7c55a95d6870a8dc8446568c4d36c4

SHA512
e77b071fc604384a723de663275234cad6db3df090ce97e89e482aadca16be27af2d5c756adc3911c4ea4ff3e4d0bf31ba50fff02f54dc0e44d6c96ceb72ae3c

Download Submit
memory/2156-1-0x00000000002D0000-0x00000000003D0000-memory.dmp

Filesize
1024KB

Download
memory/2156-2-0x00000000001B0000-0x00000000001C3000-memory.dmp

Filesize
76KB

Download
memory/2156-3-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2156-8-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2156-9-0x00000000001B0000-0x00000000001C3000-memory.dmp

Filesize
76KB

Download
memory/2428-15-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2428-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2428-12-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2428-19-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2428-20-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2428-21-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2428-22-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2548-11-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2548-16-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2548-10-0x0000000000590000-0x0000000000690000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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