tofsee | 508c827bc2401fa6a6b3ab11c6c151709b719df4f148edebee8aa1483d367f42

Analysis

max time kernel
148s
max time network
144s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
31-12-2023 01:34

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General

Target

22fb4c623834ad8a3f602da708000647.exe
Size

10.0MB
MD5

22fb4c623834ad8a3f602da708000647
SHA1

7386485a6086bf06ee7df34f6aa9c19a564749cf
SHA256

508c827bc2401fa6a6b3ab11c6c151709b719df4f148edebee8aa1483d367f42
SHA512

454f20708a71da5c851016c27600f55eb26192199cb312957dc33848fb13a5ec02ce67f9bfc2064785a800e2e0715e7cfa9cab262fd0142c6a0661bd2893b444
SSDEEP

98304:I2UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU0:I

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

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\yysixuew = "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
2644	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\yysixuew\ImagePath = "C:\\Windows\\SysWOW64\\yysixuew\\edtpwsx.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2636	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2680	edtpwsx.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2680 set thread context of 2636	2680	edtpwsx.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
1932	sc.exe
2332	sc.exe
1396	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 2664 wrote to memory of 2808	2664	22fb4c623834ad8a3f602da708000647.exe	28
PID 2664 wrote to memory of 2808	2664	22fb4c623834ad8a3f602da708000647.exe	28
PID 2664 wrote to memory of 2808	2664	22fb4c623834ad8a3f602da708000647.exe	28
PID 2664 wrote to memory of 2808	2664	22fb4c623834ad8a3f602da708000647.exe	28
PID 2664 wrote to memory of 2788	2664	22fb4c623834ad8a3f602da708000647.exe	31
PID 2664 wrote to memory of 2788	2664	22fb4c623834ad8a3f602da708000647.exe	31
PID 2664 wrote to memory of 2788	2664	22fb4c623834ad8a3f602da708000647.exe	31
PID 2664 wrote to memory of 2788	2664	22fb4c623834ad8a3f602da708000647.exe	31
PID 2664 wrote to memory of 1932	2664	22fb4c623834ad8a3f602da708000647.exe	32
PID 2664 wrote to memory of 1932	2664	22fb4c623834ad8a3f602da708000647.exe	32
PID 2664 wrote to memory of 1932	2664	22fb4c623834ad8a3f602da708000647.exe	32
PID 2664 wrote to memory of 1932	2664	22fb4c623834ad8a3f602da708000647.exe	32
PID 2664 wrote to memory of 2332	2664	22fb4c623834ad8a3f602da708000647.exe	34
PID 2664 wrote to memory of 2332	2664	22fb4c623834ad8a3f602da708000647.exe	34
PID 2664 wrote to memory of 2332	2664	22fb4c623834ad8a3f602da708000647.exe	34
PID 2664 wrote to memory of 2332	2664	22fb4c623834ad8a3f602da708000647.exe	34
PID 2664 wrote to memory of 1396	2664	22fb4c623834ad8a3f602da708000647.exe	36
PID 2664 wrote to memory of 1396	2664	22fb4c623834ad8a3f602da708000647.exe	36
PID 2664 wrote to memory of 1396	2664	22fb4c623834ad8a3f602da708000647.exe	36
PID 2664 wrote to memory of 1396	2664	22fb4c623834ad8a3f602da708000647.exe	36
PID 2664 wrote to memory of 2644	2664	22fb4c623834ad8a3f602da708000647.exe	40
PID 2664 wrote to memory of 2644	2664	22fb4c623834ad8a3f602da708000647.exe	40
PID 2664 wrote to memory of 2644	2664	22fb4c623834ad8a3f602da708000647.exe	40
PID 2664 wrote to memory of 2644	2664	22fb4c623834ad8a3f602da708000647.exe	40
PID 2680 wrote to memory of 2636	2680	edtpwsx.exe	41
PID 2680 wrote to memory of 2636	2680	edtpwsx.exe	41
PID 2680 wrote to memory of 2636	2680	edtpwsx.exe	41
PID 2680 wrote to memory of 2636	2680	edtpwsx.exe	41
PID 2680 wrote to memory of 2636	2680	edtpwsx.exe	41
PID 2680 wrote to memory of 2636	2680	edtpwsx.exe	41

C:\Users\Admin\AppData\Local\Temp\22fb4c623834ad8a3f602da708000647.exe
"C:\Users\Admin\AppData\Local\Temp\22fb4c623834ad8a3f602da708000647.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2664
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yysixuew\
  2⤵
  PID:2808
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\edtpwsx.exe" C:\Windows\SysWOW64\yysixuew\
  2⤵
  PID:2788
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create yysixuew binPath= "C:\Windows\SysWOW64\yysixuew\edtpwsx.exe /d\"C:\Users\Admin\AppData\Local\Temp\22fb4c623834ad8a3f602da708000647.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1932
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description yysixuew "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2332
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start yysixuew
  2⤵
  - Launches sc.exe
  PID:1396
- 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:2644

C:\Windows\SysWOW64\yysixuew\edtpwsx.exe
C:\Windows\SysWOW64\yysixuew\edtpwsx.exe /d"C:\Users\Admin\AppData\Local\Temp\22fb4c623834ad8a3f602da708000647.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2680
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:2636

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\edtpwsx.exe

Filesize
432KB

MD5
e41afc6800f113729a94562c4d0f6076

SHA1
352c8380ea21350143f95d7cf6a354fab143847e

SHA256
967ce8c6549f50edeb7d6dd9f0b94735f7f5f3d788a74851fb708da26e4b27be

SHA512
74d21aca4a3a0f4d746841067105957961e0770659ba0aba07f5a9e7d34df2b89219ca1d1457be4e572e31d0b1f19cf5360619bbc69b0c70d3e2e297e8ca5ee3

Download Submit
C:\Windows\SysWOW64\yysixuew\edtpwsx.exe

Filesize
139KB

MD5
8d4dc0dec2a9878db5c502a868e7c847

SHA1
7fdc293f889b46449766b53f4c40d550cb4e2bf6

SHA256
33626cbbb64ced7b2c8229bcd0905980008f8744f15e20e3ed084bc14b66c90d

SHA512
1366617bbb3efdc332cc2636f73854376c3ca24ccd9c04fd5b5cae8575015f4a1b9480069270151633d358383874898025c4b8bb57f72441a6c42109079f928c

Download Submit
memory/2636-14-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2636-20-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2636-22-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2636-11-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2636-19-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2636-21-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2636-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2664-1-0x0000000000560000-0x0000000000660000-memory.dmp

Filesize
1024KB

Download
memory/2664-17-0x0000000000400000-0x0000000000474000-memory.dmp

Filesize
464KB

Download
memory/2664-3-0x0000000000400000-0x0000000000474000-memory.dmp

Filesize
464KB

Download
memory/2664-2-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2680-15-0x0000000000400000-0x0000000000474000-memory.dmp

Filesize
464KB

Download
memory/2680-8-0x0000000000590000-0x0000000000690000-memory.dmp

Filesize
1024KB

Download
memory/2680-9-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2680-10-0x0000000000400000-0x0000000000474000-memory.dmp

Filesize
464KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads