Analysis Overview
SHA256
fc4a9a452313a34724e59b38bf3a2a04898219c139705d0966959f75232246c2
Threat Level: Known bad
The file joker.exe was found to be: Known bad.
Malicious Activity Summary
Njrat family
Drops startup file
Adds Run key to start application
Unsigned PE
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Kills process with taskkill
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-02-24 13:09
Signatures
Njrat family
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-02-24 13:09
Reported
2024-02-24 13:46
Platform
win7-20240221-en
Max time kernel
1815s
Max time network
1819s
Command Line
Signatures
Drops startup file
| Description | Indicator | Process | Target |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Client.url | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Client.exe | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Client.exe | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000\Software\Microsoft\Windows\CurrentVersion\Run\Client.exe = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\joker.exe\" .." | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Client.exe = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\joker.exe\" .." | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
Kills process with taskkill
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\TASKKILL.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\TASKKILL.exe | N/A |
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2700 wrote to memory of 2088 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 2700 wrote to memory of 2088 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 2700 wrote to memory of 2088 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 2700 wrote to memory of 2088 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 2700 wrote to memory of 2568 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 2700 wrote to memory of 2568 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 2700 wrote to memory of 2568 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 2700 wrote to memory of 2568 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
Processes
C:\Users\Admin\AppData\Local\Temp\joker.exe
"C:\Users\Admin\AppData\Local\Temp\joker.exe"
C:\Windows\SysWOW64\TASKKILL.exe
TASKKILL /F /IM wscript.exe
C:\Windows\SysWOW64\TASKKILL.exe
TASKKILL /F /IM cmd.exe
Network
Files
memory/2700-0-0x0000000073F50000-0x00000000744FB000-memory.dmp
memory/2700-1-0x0000000073F50000-0x00000000744FB000-memory.dmp
memory/2700-2-0x0000000000430000-0x0000000000470000-memory.dmp
memory/2700-17-0x0000000073F50000-0x00000000744FB000-memory.dmp
memory/2700-18-0x0000000073F50000-0x00000000744FB000-memory.dmp
memory/2700-19-0x0000000000430000-0x0000000000470000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-02-24 13:09
Reported
2024-02-24 13:46
Platform
win10-20240221-en
Max time kernel
1800s
Max time network
1594s
Command Line
Signatures
Drops startup file
| Description | Indicator | Process | Target |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Client.exe | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Client.url | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Client.exe | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-1681664450-2645008397-319333953-1000\Software\Microsoft\Windows\CurrentVersion\Run\Client.exe = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\joker.exe\" .." | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Client.exe = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\joker.exe\" .." | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
Kills process with taskkill
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\TASKKILL.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\TASKKILL.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1256 wrote to memory of 3692 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1256 wrote to memory of 3692 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1256 wrote to memory of 3692 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1256 wrote to memory of 4784 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1256 wrote to memory of 4784 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1256 wrote to memory of 4784 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
Processes
C:\Users\Admin\AppData\Local\Temp\joker.exe
"C:\Users\Admin\AppData\Local\Temp\joker.exe"
C:\Windows\SysWOW64\TASKKILL.exe
TASKKILL /F /IM wscript.exe
C:\Windows\SysWOW64\TASKKILL.exe
TASKKILL /F /IM cmd.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 43.229.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 66.112.168.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 194.178.17.96.in-addr.arpa | udp |
Files
memory/1256-0-0x0000000073900000-0x0000000073EB0000-memory.dmp
memory/1256-1-0x0000000073900000-0x0000000073EB0000-memory.dmp
memory/1256-2-0x0000000002D20000-0x0000000002D30000-memory.dmp
memory/1256-8-0x0000000073900000-0x0000000073EB0000-memory.dmp
memory/1256-9-0x0000000073900000-0x0000000073EB0000-memory.dmp
memory/1256-10-0x0000000002D20000-0x0000000002D30000-memory.dmp
Analysis: behavioral3
Detonation Overview
Submitted
2024-02-24 13:09
Reported
2024-02-24 13:47
Platform
win10v2004-20240221-en
Max time kernel
1799s
Max time network
1172s
Command Line
Signatures
Drops startup file
| Description | Indicator | Process | Target |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Client.exe | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Client.url | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Client.exe | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-1712835645-2080934712-2142796781-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Client.exe = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\joker.exe\" .." | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Client.exe = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\joker.exe\" .." | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
Kills process with taskkill
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\TASKKILL.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\TASKKILL.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 844 wrote to memory of 2736 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 844 wrote to memory of 2736 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 844 wrote to memory of 2736 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 844 wrote to memory of 2336 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 844 wrote to memory of 2336 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 844 wrote to memory of 2336 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
Processes
C:\Users\Admin\AppData\Local\Temp\joker.exe
"C:\Users\Admin\AppData\Local\Temp\joker.exe"
C:\Windows\SysWOW64\TASKKILL.exe
TASKKILL /F /IM wscript.exe
C:\Windows\SysWOW64\TASKKILL.exe
TASKKILL /F /IM cmd.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | g.bing.com | udp |
| US | 204.79.197.200:443 | g.bing.com | tcp |
| US | 8.8.8.8:53 | 23.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 180.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 241.154.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 43.58.199.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 41.110.16.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 183.59.114.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 15.164.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 18.134.221.88.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 0.205.248.87.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 13.227.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 9.173.189.20.in-addr.arpa | udp |
Files
memory/844-0-0x0000000074670000-0x0000000074C21000-memory.dmp
memory/844-1-0x0000000074670000-0x0000000074C21000-memory.dmp
memory/844-2-0x0000000000E50000-0x0000000000E60000-memory.dmp
memory/844-8-0x0000000074670000-0x0000000074C21000-memory.dmp
memory/844-9-0x0000000074670000-0x0000000074C21000-memory.dmp
Analysis: behavioral4
Detonation Overview
Submitted
2024-02-24 13:09
Reported
2024-02-24 13:18
Platform
debian12-armhf-20240221-en