Malware Analysis Report

2025-08-10 22:52

Sample ID 240107-x2r1qsccgr
Target a2adb7966f88e6c0e15a8f5a04404fcf.exe
SHA256 3cb6cffbee2f03febb5c5ffc0e6b6f7d06e184ee69c6d873bc4619fe4ebfcce7
Tags
tofsee evasion persistence trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

3cb6cffbee2f03febb5c5ffc0e6b6f7d06e184ee69c6d873bc4619fe4ebfcce7

Threat Level: Known bad

The file a2adb7966f88e6c0e15a8f5a04404fcf.exe was found to be: Known bad.

Malicious Activity Summary

tofsee evasion persistence trojan

Tofsee

Windows security bypass

Creates new service(s)

Sets service image path in registry

Modifies Windows Firewall

Deletes itself

Executes dropped EXE

Suspicious use of SetThreadContext

Launches sc.exe

Unsigned PE

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-01-07 19:21

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-01-07 19:21

Reported

2024-01-07 19:23

Platform

win7-20231129-en

Max time kernel

119s

Max time network

122s

Command Line

"C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe"

Signatures

Tofsee

trojan tofsee

Windows security bypass

evasion trojan
Description Indicator Process Target
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\ziyvzfpp = "0" C:\Windows\SysWOW64\svchost.exe N/A

Creates new service(s)

persistence

Modifies Windows Firewall

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\netsh.exe N/A

Sets service image path in registry

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SYSTEM\ControlSet001\services\ziyvzfpp\ImagePath = "C:\\Windows\\SysWOW64\\ziyvzfpp\\ygvzmktt.exe" C:\Windows\SysWOW64\svchost.exe N/A

Deletes itself

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\svchost.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\ziyvzfpp\ygvzmktt.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2664 set thread context of 2756 N/A C:\Windows\SysWOW64\ziyvzfpp\ygvzmktt.exe C:\Windows\SysWOW64\svchost.exe

Launches sc.exe

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\sc.exe N/A
N/A N/A C:\Windows\SysWOW64\sc.exe N/A
N/A N/A C:\Windows\SysWOW64\sc.exe N/A

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2416 wrote to memory of 1996 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\cmd.exe
PID 2416 wrote to memory of 1996 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\cmd.exe
PID 2416 wrote to memory of 1996 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\cmd.exe
PID 2416 wrote to memory of 1996 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\cmd.exe
PID 2416 wrote to memory of 2764 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\cmd.exe
PID 2416 wrote to memory of 2764 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\cmd.exe
PID 2416 wrote to memory of 2764 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\cmd.exe
PID 2416 wrote to memory of 2764 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\cmd.exe
PID 2416 wrote to memory of 2260 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\sc.exe
PID 2416 wrote to memory of 2260 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\sc.exe
PID 2416 wrote to memory of 2260 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\sc.exe
PID 2416 wrote to memory of 2260 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\sc.exe
PID 2416 wrote to memory of 2532 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\sc.exe
PID 2416 wrote to memory of 2532 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\sc.exe
PID 2416 wrote to memory of 2532 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\sc.exe
PID 2416 wrote to memory of 2532 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\sc.exe
PID 2416 wrote to memory of 2632 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\sc.exe
PID 2416 wrote to memory of 2632 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\sc.exe
PID 2416 wrote to memory of 2632 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\sc.exe
PID 2416 wrote to memory of 2632 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\sc.exe
PID 2416 wrote to memory of 2636 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\netsh.exe
PID 2416 wrote to memory of 2636 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\netsh.exe
PID 2416 wrote to memory of 2636 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\netsh.exe
PID 2416 wrote to memory of 2636 N/A C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe C:\Windows\SysWOW64\netsh.exe
PID 2664 wrote to memory of 2756 N/A C:\Windows\SysWOW64\ziyvzfpp\ygvzmktt.exe C:\Windows\SysWOW64\svchost.exe
PID 2664 wrote to memory of 2756 N/A C:\Windows\SysWOW64\ziyvzfpp\ygvzmktt.exe C:\Windows\SysWOW64\svchost.exe
PID 2664 wrote to memory of 2756 N/A C:\Windows\SysWOW64\ziyvzfpp\ygvzmktt.exe C:\Windows\SysWOW64\svchost.exe
PID 2664 wrote to memory of 2756 N/A C:\Windows\SysWOW64\ziyvzfpp\ygvzmktt.exe C:\Windows\SysWOW64\svchost.exe
PID 2664 wrote to memory of 2756 N/A C:\Windows\SysWOW64\ziyvzfpp\ygvzmktt.exe C:\Windows\SysWOW64\svchost.exe
PID 2664 wrote to memory of 2756 N/A C:\Windows\SysWOW64\ziyvzfpp\ygvzmktt.exe C:\Windows\SysWOW64\svchost.exe

Processes

C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe

"C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ziyvzfpp\

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ygvzmktt.exe" C:\Windows\SysWOW64\ziyvzfpp\

C:\Windows\SysWOW64\sc.exe

"C:\Windows\System32\sc.exe" create ziyvzfpp binPath= "C:\Windows\SysWOW64\ziyvzfpp\ygvzmktt.exe /d\"C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe\"" type= own start= auto DisplayName= "wifi support"

C:\Windows\SysWOW64\sc.exe

"C:\Windows\System32\sc.exe" description ziyvzfpp "wifi internet conection"

C:\Windows\SysWOW64\sc.exe

"C:\Windows\System32\sc.exe" start ziyvzfpp

C:\Windows\SysWOW64\ziyvzfpp\ygvzmktt.exe

C:\Windows\SysWOW64\ziyvzfpp\ygvzmktt.exe /d"C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe"

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

C:\Windows\SysWOW64\svchost.exe

svchost.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 microsoft.com udp
US 20.112.250.133:80 microsoft.com tcp
US 8.8.8.8:53 microsoft.com udp
US 8.8.8.8:53 microsoft-com.mail.protection.outlook.com udp
US 52.101.11.0:25 microsoft-com.mail.protection.outlook.com tcp
HK 43.231.4.7:443 tcp
US 8.8.8.8:53 yahoo.com udp
US 8.8.8.8:53 mta5.am0.yahoodns.net udp
US 67.195.228.111:25 mta5.am0.yahoodns.net tcp
US 8.8.8.8:53 google.com udp
US 8.8.8.8:53 smtp.google.com udp
US 108.177.127.27:25 smtp.google.com tcp
HK 43.231.4.7:443 tcp
US 8.8.8.8:53 mail.ru udp
US 8.8.8.8:53 mxs.mail.ru udp
RU 217.69.139.150:25 mxs.mail.ru tcp
HK 43.231.4.7:443 tcp

Files

memory/2416-2-0x00000000002A0000-0x00000000002B3000-memory.dmp

memory/2416-1-0x0000000003740000-0x0000000003840000-memory.dmp

memory/2416-4-0x0000000000400000-0x00000000036CD000-memory.dmp

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

MD5 ac6d1876a306a54c19def1c8e257a8b9
SHA1 d960ba60e7b55e263143df239ae9f7b42dab73cf
SHA256 66ee251bbcbaacdf9062897c83e38e02fe331631b041caf6c03379744a7dd8b0
SHA512 a7c87cacd14dd1184156b6f554c7793faf638b2dac471474d1651ea101ca53711950fa0bfe1bdb487704d29c9d1efb94119d99180ee2cc0ccb0697cfb22dcf2a

C:\Windows\SysWOW64\ziyvzfpp\ygvzmktt.exe

MD5 ea96e0346a6397f0459f83ca458841a7
SHA1 a979ce56ca0dbde04e0ec77b94c143fc4e7c3872
SHA256 154fbfb86c78f728df08893f8dfaf0e866d15ece0e2f53f6dc54bee82097ddf2
SHA512 994fcdc9466110944f1404da13d6e6c62f26eb61567b0fe8b142d9e2a15cc10dc88e3776e5b51f0f85805460867a40ca7d385ae48f92c5902a093f7692fceaf1

memory/2664-9-0x0000000000290000-0x0000000000390000-memory.dmp

memory/2756-13-0x00000000000D0000-0x00000000000E5000-memory.dmp

memory/2756-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2664-15-0x0000000000400000-0x00000000036CD000-memory.dmp

memory/2756-10-0x00000000000D0000-0x00000000000E5000-memory.dmp

memory/2756-18-0x00000000000D0000-0x00000000000E5000-memory.dmp

memory/2664-17-0x0000000000400000-0x00000000036CD000-memory.dmp

memory/2756-19-0x00000000000D0000-0x00000000000E5000-memory.dmp

memory/2756-20-0x00000000000D0000-0x00000000000E5000-memory.dmp

memory/2416-7-0x0000000000400000-0x00000000036CD000-memory.dmp

memory/2756-21-0x00000000000D0000-0x00000000000E5000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-07 19:21

Reported

2024-01-07 19:23

Platform

win10v2004-20231215-en

Max time kernel

3s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe"

Signatures

Tofsee

trojan tofsee

Creates new service(s)

persistence

Modifies Windows Firewall

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\netsh.exe N/A

Launches sc.exe

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\sc.exe N/A
N/A N/A C:\Windows\SysWOW64\sc.exe N/A
N/A N/A C:\Windows\SysWOW64\sc.exe N/A

Enumerates physical storage devices

Processes

C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe

"C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ylbrdnvs\

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gtfcvinx.exe" C:\Windows\SysWOW64\ylbrdnvs\

C:\Windows\SysWOW64\sc.exe

"C:\Windows\System32\sc.exe" create ylbrdnvs binPath= "C:\Windows\SysWOW64\ylbrdnvs\gtfcvinx.exe /d\"C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe\"" type= own start= auto DisplayName= "wifi support"

C:\Windows\SysWOW64\sc.exe

"C:\Windows\System32\sc.exe" description ylbrdnvs "wifi internet conection"

C:\Windows\SysWOW64\sc.exe

"C:\Windows\System32\sc.exe" start ylbrdnvs

C:\Windows\SysWOW64\ylbrdnvs\gtfcvinx.exe

C:\Windows\SysWOW64\ylbrdnvs\gtfcvinx.exe /d"C:\Users\Admin\AppData\Local\Temp\a2adb7966f88e6c0e15a8f5a04404fcf.exe"

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

C:\Windows\SysWOW64\svchost.exe

svchost.exe

Network

Country Destination Domain Proto
US 20.231.121.79:80 tcp
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
US 8.8.8.8:53 21.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 52.179.17.96.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 microsoft.com udp
US 20.112.250.133:80 microsoft.com tcp
US 8.8.8.8:53 microsoft.com udp
US 8.8.8.8:53 microsoft-com.mail.protection.outlook.com udp
US 52.101.42.0:25 microsoft-com.mail.protection.outlook.com tcp
US 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
HK 43.231.4.7:443 tcp
US 8.8.8.8:53 yahoo.com udp
US 8.8.8.8:53 mta5.am0.yahoodns.net udp
US 67.195.228.111:25 mta5.am0.yahoodns.net tcp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 2.136.104.51.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 28.160.77.104.in-addr.arpa udp
US 8.8.8.8:53 google.com udp
US 8.8.8.8:53 smtp.google.com udp
US 108.177.127.27:25 smtp.google.com tcp
HK 43.231.4.7:443 tcp
US 8.8.8.8:53 62.179.17.96.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
US 8.8.8.8:53 mail.ru udp
US 8.8.8.8:53 mxs.mail.ru udp
RU 94.100.180.31:25 mxs.mail.ru tcp
US 8.8.8.8:53 23.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
HK 43.231.4.7:443 tcp
GB 96.16.110.41:443 tcp

Files

memory/2676-2-0x00000000037A0000-0x00000000037B3000-memory.dmp

memory/2676-1-0x0000000003800000-0x0000000003900000-memory.dmp

memory/2676-4-0x0000000000400000-0x00000000036CD000-memory.dmp

memory/2676-8-0x00000000037A0000-0x00000000037B3000-memory.dmp

memory/2676-7-0x0000000000400000-0x00000000036CD000-memory.dmp

memory/2304-13-0x00000000036E0000-0x00000000037E0000-memory.dmp

memory/3364-10-0x00000000001D0000-0x00000000001E5000-memory.dmp

memory/3364-15-0x00000000001D0000-0x00000000001E5000-memory.dmp

memory/3364-18-0x00000000001D0000-0x00000000001E5000-memory.dmp

memory/2304-17-0x0000000000400000-0x00000000036CD000-memory.dmp

memory/3364-16-0x00000000001D0000-0x00000000001E5000-memory.dmp

memory/2304-19-0x0000000000400000-0x00000000036CD000-memory.dmp

memory/3364-20-0x00000000001D0000-0x00000000001E5000-memory.dmp