Analysis Overview
SHA256
b33a01548088b02d5ef5e727d704cb0f60adb233a8c0592e59ff4c69204cb9e1
Threat Level: Known bad
The file de6b0434de35cf7e80ca010ea9c0bd03 was found to be: Known bad.
Malicious Activity Summary
Tofsee
Windows security bypass
Sets service image path in registry
Modifies Windows Firewall
Creates new service(s)
Deletes itself
Checks computer location settings
Executes dropped EXE
Suspicious use of SetThreadContext
Launches sc.exe
Enumerates physical storage devices
Program crash
Unsigned PE
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-03-25 16:12
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-03-25 16:12
Reported
2024-03-25 16:14
Platform
win7-20240221-en
Max time kernel
149s
Max time network
118s
Command Line
Signatures
Tofsee
Windows security bypass
| Description | Indicator | Process | Target |
| Set value (int) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\esukvmyu = "0" | C:\Windows\SysWOW64\svchost.exe | N/A |
Creates new service(s)
Modifies Windows Firewall
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\netsh.exe | N/A |
Sets service image path in registry
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SYSTEM\ControlSet001\services\esukvmyu\ImagePath = "C:\\Windows\\SysWOW64\\esukvmyu\\qkkbmvmo.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\esukvmyu\qkkbmvmo.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 2424 set thread context of 2600 | N/A | C:\Windows\SysWOW64\esukvmyu\qkkbmvmo.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
Processes
C:\Users\Admin\AppData\Local\Temp\de6b0434de35cf7e80ca010ea9c0bd03.exe
"C:\Users\Admin\AppData\Local\Temp\de6b0434de35cf7e80ca010ea9c0bd03.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\esukvmyu\
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qkkbmvmo.exe" C:\Windows\SysWOW64\esukvmyu\
C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create esukvmyu binPath= "C:\Windows\SysWOW64\esukvmyu\qkkbmvmo.exe /d\"C:\Users\Admin\AppData\Local\Temp\de6b0434de35cf7e80ca010ea9c0bd03.exe\"" type= own start= auto DisplayName= "wifi support"
C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description esukvmyu "wifi internet conection"
C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start esukvmyu
C:\Windows\SysWOW64\esukvmyu\qkkbmvmo.exe
C:\Windows\SysWOW64\esukvmyu\qkkbmvmo.exe /d"C:\Users\Admin\AppData\Local\Temp\de6b0434de35cf7e80ca010ea9c0bd03.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 |
| HK | 43.231.4.7:443 | 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 |
| US | 8.8.8.8:53 | yahoo.com | udp |
| US | 8.8.8.8:53 | mta7.am0.yahoodns.net | udp |
| US | 98.136.96.91:25 | mta7.am0.yahoodns.net | tcp |
| US | 8.8.8.8:53 | google.com | udp |
| US | 8.8.8.8:53 | smtp.google.com | udp |
| BE | 64.233.166.26:25 | 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 | 94.100.180.31:25 | mxs.mail.ru | tcp |
| HK | 43.231.4.7:443 | tcp |
Files
memory/1948-2-0x0000000000020000-0x0000000000033000-memory.dmp
memory/1948-1-0x0000000000CE0000-0x0000000000DE0000-memory.dmp
memory/1948-4-0x0000000000400000-0x0000000000C18000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\qkkbmvmo.exe
| MD5 | 780c714e424d8988d6e259632588ba2e |
| SHA1 | daefc3af14c1498ca10ded8abc1a4c1dbdbe42e9 |
| SHA256 | 3d7bf1d2c5fc1227d34287ca23a56ca6bb8cc59d39334358ae4da0e618a376a1 |
| SHA512 | 90644d66c66bb79397d8bd360beebe66fb65ccd51dc20686cf6ca30f40bc67e5abf57d0e906dfa4dc4e5de4dcce4ea3bd05a2811dac8d43e9f6606e13b499176 |
C:\Windows\SysWOW64\esukvmyu\qkkbmvmo.exe
| MD5 | 5833a6a9c093266df2ae5c0430a291a7 |
| SHA1 | 00bf58b5ee1745b18ab36762cf728bac7a5b8e10 |
| SHA256 | 5d6806b4d75b1a6ee120910b1933897741d09af4bae895609ff8ae2a1792232d |
| SHA512 | 1ba836ca6c16231453b0f2a1a1b1def95e9952416e3bcc749038ee32b33c7e47c98c41a8f7778152feaa21ca668fcd7ad01e2b0d45dc2b52ec4d71db48af281e |
memory/1948-9-0x0000000000020000-0x0000000000033000-memory.dmp
memory/2424-11-0x0000000000400000-0x0000000000C18000-memory.dmp
memory/2424-10-0x0000000000270000-0x0000000000370000-memory.dmp
memory/1948-7-0x0000000000400000-0x0000000000C18000-memory.dmp
memory/2600-12-0x00000000000D0000-0x00000000000E5000-memory.dmp
memory/2600-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
memory/2600-15-0x00000000000D0000-0x00000000000E5000-memory.dmp
memory/2424-17-0x0000000000400000-0x0000000000C18000-memory.dmp
memory/2600-20-0x00000000000D0000-0x00000000000E5000-memory.dmp
memory/2600-19-0x00000000000D0000-0x00000000000E5000-memory.dmp
memory/2600-21-0x00000000000D0000-0x00000000000E5000-memory.dmp
memory/2600-22-0x00000000000D0000-0x00000000000E5000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-03-25 16:12
Reported
2024-03-25 16:15
Platform
win10v2004-20240226-en
Max time kernel
149s
Max time network
153s
Command Line
Signatures
Tofsee
Creates new service(s)
Modifies Windows Firewall
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\netsh.exe | N/A |
Sets service image path in registry
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\oxzjlybb\ImagePath = "C:\\Windows\\SysWOW64\\oxzjlybb\\ckzdqoxx.exe" | C:\Windows\SysWOW64\svchost.exe | N/A |
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-3270530367-132075249-2153716227-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\de6b0434de35cf7e80ca010ea9c0bd03.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\oxzjlybb\ckzdqoxx.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 1956 set thread context of 2056 | N/A | C:\Windows\SysWOW64\oxzjlybb\ckzdqoxx.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
Program crash
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\WerFault.exe | C:\Windows\SysWOW64\oxzjlybb\ckzdqoxx.exe |
| N/A | N/A | C:\Windows\SysWOW64\WerFault.exe | C:\Users\Admin\AppData\Local\Temp\de6b0434de35cf7e80ca010ea9c0bd03.exe |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\de6b0434de35cf7e80ca010ea9c0bd03.exe
"C:\Users\Admin\AppData\Local\Temp\de6b0434de35cf7e80ca010ea9c0bd03.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\oxzjlybb\
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ckzdqoxx.exe" C:\Windows\SysWOW64\oxzjlybb\
C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create oxzjlybb binPath= "C:\Windows\SysWOW64\oxzjlybb\ckzdqoxx.exe /d\"C:\Users\Admin\AppData\Local\Temp\de6b0434de35cf7e80ca010ea9c0bd03.exe\"" type= own start= auto DisplayName= "wifi support"
C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description oxzjlybb "wifi internet conection"
C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start oxzjlybb
C:\Windows\SysWOW64\oxzjlybb\ckzdqoxx.exe
C:\Windows\SysWOW64\oxzjlybb\ckzdqoxx.exe /d"C:\Users\Admin\AppData\Local\Temp\de6b0434de35cf7e80ca010ea9c0bd03.exe"
C:\Windows\SysWOW64\svchost.exe
svchost.exe
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1956 -ip 1956
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\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 4348 -ip 4348
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1956 -s 516
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4348 -s 1272
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 133.211.185.52.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 | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 138.32.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 241.154.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 28.118.140.52.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 | 8.8.8.8:53 | 41.110.16.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 133.250.112.20.in-addr.arpa | udp |
| US | 104.47.54.36:25 | microsoft-com.mail.protection.outlook.com | tcp |
| HK | 43.231.4.7:443 | tcp | |
| US | 8.8.8.8:53 | 86.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 97.17.167.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 171.39.242.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 209.205.72.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | yahoo.com | udp |
| US | 8.8.8.8:53 | mta5.am0.yahoodns.net | udp |
| US | 98.136.96.75:25 | mta5.am0.yahoodns.net | tcp |
| US | 8.8.8.8:53 | 195.177.78.104.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 119.110.54.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 217.135.221.88.in-addr.arpa | udp |
| NL | 52.142.223.178:80 | tcp | |
| US | 8.8.8.8:53 | 181.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 50.134.221.88.in-addr.arpa | udp |
| US | 8.8.8.8:53 | google.com | udp |
| US | 8.8.8.8:53 | smtp.google.com | udp |
| BE | 64.233.166.26:25 | smtp.google.com | tcp |
| HK | 43.231.4.7:443 | tcp | |
| US | 8.8.8.8:53 | 189.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 88.156.103.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | mail.ru | udp |
| US | 8.8.8.8:53 | mxs.mail.ru | udp |
| RU | 217.69.139.150:25 | mxs.mail.ru | tcp |
| US | 8.8.8.8:53 | 203.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 21.236.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 56.126.166.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 57.169.31.20.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 |
| US | 8.8.8.8:53 | 211.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 211.135.221.88.in-addr.arpa | udp |
| HK | 43.231.4.7:443 | tcp | |
| US | 8.8.8.8:53 | 137.71.105.51.in-addr.arpa | udp |
Files
memory/4348-1-0x0000000000EE0000-0x0000000000FE0000-memory.dmp
memory/4348-2-0x0000000000D80000-0x0000000000D93000-memory.dmp
memory/4348-4-0x0000000000400000-0x0000000000C18000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\ckzdqoxx.exe
| MD5 | b2119dab7c0f24bd5f153dc10be26bde |
| SHA1 | 7b971ea4b0d4b21d962725f060d03dc0f1715f0a |
| SHA256 | f501dd0057e7bad603bc2e1a5b4ba7e34e490e4138b2f5eed578084ebf0c79bf |
| SHA512 | daebf2c43d6c701903aef6cf527f97a5588665c0e655172356c263cec2e3f65120cb4c161ac9d931538af5173fa156e8ed6b7c8662cbc7a870039db9122243c5 |
memory/1956-8-0x0000000000D70000-0x0000000000E70000-memory.dmp
memory/1956-9-0x0000000001070000-0x0000000001083000-memory.dmp
memory/1956-11-0x0000000000400000-0x0000000000C18000-memory.dmp
memory/2056-10-0x0000000000DE0000-0x0000000000DF5000-memory.dmp
memory/2056-14-0x0000000000DE0000-0x0000000000DF5000-memory.dmp
memory/1956-15-0x0000000000400000-0x0000000000C18000-memory.dmp
memory/4348-16-0x0000000000400000-0x0000000000C18000-memory.dmp
memory/2056-17-0x0000000000DE0000-0x0000000000DF5000-memory.dmp
memory/2056-18-0x0000000000DE0000-0x0000000000DF5000-memory.dmp
memory/2056-19-0x0000000000DE0000-0x0000000000DF5000-memory.dmp