Analysis Overview
SHA256
3fb717331c0f4b48744117e7844a4bcf08333af621cfcfe790d4a5e2dcf810fe
Threat Level: Known bad
The file 4a585ee0c216369f0392abd7b7ef0c1c was found to be: Known bad.
Malicious Activity Summary
Tofsee
Windows security bypass
Sets service image path in registry
Creates new service(s)
Modifies Windows Firewall
Executes dropped EXE
Checks computer location settings
Deletes itself
Suspicious use of SetThreadContext
Launches sc.exe
Enumerates physical storage devices
Unsigned PE
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-01-08 03:42
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-01-08 03:42
Reported
2024-01-08 03:44
Platform
win7-20231129-en
Max time kernel
146s
Max time network
146s
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\coxwlimb = "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\coxwlimb\ImagePath = "C:\\Windows\\SysWOW64\\coxwlimb\\ktbzsuxx.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\coxwlimb\ktbzsuxx.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 2740 set thread context of 2496 | N/A | C:\Windows\SysWOW64\coxwlimb\ktbzsuxx.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\4a585ee0c216369f0392abd7b7ef0c1c.exe
"C:\Users\Admin\AppData\Local\Temp\4a585ee0c216369f0392abd7b7ef0c1c.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\coxwlimb\
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ktbzsuxx.exe" C:\Windows\SysWOW64\coxwlimb\
C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create coxwlimb binPath= "C:\Windows\SysWOW64\coxwlimb\ktbzsuxx.exe /d\"C:\Users\Admin\AppData\Local\Temp\4a585ee0c216369f0392abd7b7ef0c1c.exe\"" type= own start= auto DisplayName= "wifi support"
C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description coxwlimb "wifi internet conection"
C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start coxwlimb
C:\Windows\SysWOW64\coxwlimb\ktbzsuxx.exe
C:\Windows\SysWOW64\coxwlimb\ktbzsuxx.exe /d"C:\Users\Admin\AppData\Local\Temp\4a585ee0c216369f0392abd7b7ef0c1c.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 | defeatwax.ru | udp |
| US | 8.8.8.8:53 | microsoft.com | udp |
| US | 8.8.8.8:53 | microsoft-com.mail.protection.outlook.com | udp |
| US | 52.101.8.49:25 | microsoft-com.mail.protection.outlook.com | tcp |
| US | 8.8.8.8:53 | yahoo.com | udp |
| US | 8.8.8.8:53 | mta6.am0.yahoodns.net | udp |
| US | 98.136.96.75:25 | mta6.am0.yahoodns.net | tcp |
| US | 8.8.8.8:53 | google.com | udp |
| US | 8.8.8.8:53 | smtp.google.com | udp |
| US | 173.194.69.26:25 | smtp.google.com | tcp |
| US | 8.8.8.8:53 | refabyd.info | 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 |
Files
memory/2360-3-0x00000000001B0000-0x00000000001C3000-memory.dmp
memory/2360-4-0x0000000000400000-0x000000000046E000-memory.dmp
memory/2360-1-0x0000000000290000-0x0000000000390000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\ktbzsuxx.exe
| MD5 | 4a81e1d08c015189e4e35ed1e27b4446 |
| SHA1 | 406819dfd81603a09b0c4ebddcfb5802fbd728f2 |
| SHA256 | 1a68312fc9c1eecfc4e2bf33e494b035b88939552b5c30a47b89b68991fdd4c6 |
| SHA512 | 220821c5114c3df56df4e8506b47c58d29bdaefb636211a2a59bf0868a3f707af26567b817fd88ab609af9d71c946e6cff4a06e724dc1e59c008ffbcfb262628 |
C:\Windows\SysWOW64\coxwlimb\ktbzsuxx.exe
| MD5 | 68b617af7e26329180753e4e127dcd3a |
| SHA1 | e9c5512120f8e08d25504460b1cff4f1552e03e0 |
| SHA256 | 74e3cbac2ed62d100fd6e187e9bcaa95c958bd07c6c6b923f5e3bad20662653f |
| SHA512 | bd0930b74fc5ee2d84a6a0d446b40f8ebab8f93e2b362b82e748463f5ebf3e85387528ff71f8abf1b54f084b610ff7b72ec3dfb22d5622c391351e9d62d2b494 |
memory/2360-8-0x0000000000400000-0x000000000046E000-memory.dmp
memory/2496-12-0x0000000000090000-0x00000000000A5000-memory.dmp
memory/2496-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
memory/2496-9-0x0000000000090000-0x00000000000A5000-memory.dmp
memory/2740-14-0x00000000002F0000-0x00000000003F0000-memory.dmp
memory/2496-18-0x0000000000090000-0x00000000000A5000-memory.dmp
memory/2740-16-0x0000000000400000-0x000000000046E000-memory.dmp
memory/2496-19-0x0000000000090000-0x00000000000A5000-memory.dmp
memory/2740-22-0x00000000002F0000-0x00000000003F0000-memory.dmp
memory/2496-23-0x0000000000090000-0x00000000000A5000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-01-08 03:42
Reported
2024-01-08 03:45
Platform
win10v2004-20231215-en
Max time kernel
167s
Max time network
183s
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\znwhtfuy\ImagePath = "C:\\Windows\\SysWOW64\\znwhtfuy\\xkbkcprl.exe" | C:\Windows\SysWOW64\svchost.exe | N/A |
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\4a585ee0c216369f0392abd7b7ef0c1c.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\znwhtfuy\xkbkcprl.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 3876 set thread context of 3420 | N/A | C:\Windows\SysWOW64\znwhtfuy\xkbkcprl.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\4a585ee0c216369f0392abd7b7ef0c1c.exe
"C:\Users\Admin\AppData\Local\Temp\4a585ee0c216369f0392abd7b7ef0c1c.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\znwhtfuy\
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xkbkcprl.exe" C:\Windows\SysWOW64\znwhtfuy\
C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create znwhtfuy binPath= "C:\Windows\SysWOW64\znwhtfuy\xkbkcprl.exe /d\"C:\Users\Admin\AppData\Local\Temp\4a585ee0c216369f0392abd7b7ef0c1c.exe\"" type= own start= auto DisplayName= "wifi support"
C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description znwhtfuy "wifi internet conection"
C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start znwhtfuy
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\znwhtfuy\xkbkcprl.exe
C:\Windows\SysWOW64\znwhtfuy\xkbkcprl.exe /d"C:\Users\Admin\AppData\Local\Temp\4a585ee0c216369f0392abd7b7ef0c1c.exe"
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 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 21.53.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 180.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 9.228.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 41.110.16.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 2.136.104.51.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 114.110.16.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 50.23.12.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 171.39.242.20.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 | 133.250.112.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | microsoft-com.mail.protection.outlook.com | udp |
| US | 8.8.8.8:53 | defeatwax.ru | udp |
| US | 52.101.8.49:25 | microsoft-com.mail.protection.outlook.com | tcp |
| US | 8.8.8.8:53 | 134.71.91.104.in-addr.arpa | udp |
| US | 8.8.8.8:53 | defeatwax.ru | udp |
| US | 8.8.8.8:53 | 158.240.127.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 13.227.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | yahoo.com | udp |
| US | 8.8.8.8:53 | mta7.am0.yahoodns.net | udp |
| US | 67.195.204.74:25 | mta7.am0.yahoodns.net | tcp |
| US | 8.8.8.8:53 | defeatwax.ru | udp |
| US | 8.8.8.8:53 | defeatwax.ru | udp |
| US | 8.8.8.8:53 | 194.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 146.78.124.51.in-addr.arpa | udp |
| US | 8.8.8.8:53 | google.com | udp |
| US | 8.8.8.8:53 | smtp.google.com | udp |
| US | 173.194.69.27:25 | smtp.google.com | tcp |
| US | 8.8.8.8:53 | defeatwax.ru | udp |
| US | 8.8.8.8:53 | 57.169.31.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | refabyd.info | 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 | refabyd.info | udp |
| US | 8.8.8.8:53 | 73.239.69.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | refabyd.info | udp |
| US | 8.8.8.8:53 | refabyd.info | 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 | 200.197.79.204.in-addr.arpa | udp |
| US | 8.8.8.8:53 | refabyd.info | udp |
| US | 8.8.8.8:53 | defeatwax.ru | udp |
Files
memory/4488-1-0x00000000005F0000-0x00000000006F0000-memory.dmp
memory/4488-2-0x00000000005D0000-0x00000000005E3000-memory.dmp
memory/4488-3-0x0000000000400000-0x000000000046E000-memory.dmp
memory/4488-5-0x0000000000400000-0x000000000046E000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\xkbkcprl.exe
| MD5 | 700f7fe960dd994622134ecb5039dd15 |
| SHA1 | 4b0fe978100a417553749953f694554ac09cbd0c |
| SHA256 | 90c1ddcb3aa01d5c896f263022a197d9cce01a41688c32352585702bdddcd602 |
| SHA512 | 0aad6304fabf1eed1576f97b69406829fe0805aeff9932b6b9902a51d119793f64cd80c408f72a457a6e3b0f1ca1f6ab9ba024913ed04882491113dd8c298f84 |
memory/4488-7-0x0000000000400000-0x000000000046E000-memory.dmp
memory/3876-10-0x0000000000560000-0x0000000000660000-memory.dmp
memory/3876-11-0x0000000000510000-0x0000000000523000-memory.dmp
memory/3876-12-0x0000000000400000-0x000000000046E000-memory.dmp
memory/3420-13-0x00000000012F0000-0x0000000001305000-memory.dmp
memory/4488-16-0x00000000005F0000-0x00000000006F0000-memory.dmp
memory/3420-17-0x00000000012F0000-0x0000000001305000-memory.dmp
memory/3876-19-0x0000000000400000-0x000000000046E000-memory.dmp
memory/3420-20-0x00000000012F0000-0x0000000001305000-memory.dmp
memory/3420-21-0x00000000012F0000-0x0000000001305000-memory.dmp
memory/3420-27-0x00000000012F0000-0x0000000001305000-memory.dmp