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
Kills process with taskkill
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-02-24 13:05
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 13:05
Reported
2024-02-24 13:08
Platform
win7-20240221-en
Max time kernel
149s
Max time network
122s
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-1-5-21-1650401615-1019878084-3673944445-1000\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 |
| 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 use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1980 wrote to memory of 2616 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1980 wrote to memory of 2616 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1980 wrote to memory of 2616 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1980 wrote to memory of 2616 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1980 wrote to memory of 2792 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1980 wrote to memory of 2792 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1980 wrote to memory of 2792 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1980 wrote to memory of 2792 | 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/1980-0-0x0000000074010000-0x00000000745BB000-memory.dmp
memory/1980-2-0x00000000002E0000-0x0000000000320000-memory.dmp
memory/1980-1-0x0000000074010000-0x00000000745BB000-memory.dmp
memory/1980-17-0x0000000074010000-0x00000000745BB000-memory.dmp
memory/1980-18-0x0000000074010000-0x00000000745BB000-memory.dmp
memory/1980-19-0x00000000002E0000-0x0000000000320000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-02-24 13:05
Reported
2024-02-24 13:08
Platform
win10-20240221-en
Max time kernel
150s
Max time network
138s
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-1-5-21-1104443672-3570440473-4052989528-1000\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 use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 220 wrote to memory of 4992 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 220 wrote to memory of 4992 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 220 wrote to memory of 4992 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 220 wrote to memory of 1832 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 220 wrote to memory of 1832 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 220 wrote to memory of 1832 | 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 | 48.229.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 169.117.168.52.in-addr.arpa | udp |
Files
memory/220-0-0x00000000740A0000-0x0000000074650000-memory.dmp
memory/220-1-0x00000000740A0000-0x0000000074650000-memory.dmp
memory/220-2-0x0000000003050000-0x0000000003060000-memory.dmp
memory/220-8-0x00000000740A0000-0x0000000074650000-memory.dmp
memory/220-9-0x00000000740A0000-0x0000000074650000-memory.dmp
memory/220-10-0x0000000003050000-0x0000000003060000-memory.dmp
Analysis: behavioral3
Detonation Overview
Submitted
2024-02-24 13:05
Reported
2024-02-24 13:08
Platform
win10v2004-20240221-en
Max time kernel
149s
Max time network
114s
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-1-5-21-1392040655-2056082574-619088944-1000\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 use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1280 wrote to memory of 4512 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1280 wrote to memory of 4512 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1280 wrote to memory of 4512 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1280 wrote to memory of 1836 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1280 wrote to memory of 1836 | N/A | C:\Users\Admin\AppData\Local\Temp\joker.exe | C:\Windows\SysWOW64\TASKKILL.exe |
| PID 1280 wrote to memory of 1836 | 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 cmd.exe
C:\Windows\SysWOW64\TASKKILL.exe
TASKKILL /F /IM wscript.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 194.178.17.96.in-addr.arpa | udp |
| 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 | 241.154.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 41.110.16.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 26.165.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 171.39.242.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 18.134.221.88.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 43.229.111.52.in-addr.arpa | udp |
Files
memory/1280-1-0x0000000000AF0000-0x0000000000B00000-memory.dmp
memory/1280-0-0x0000000074FB0000-0x0000000075561000-memory.dmp
memory/1280-2-0x0000000074FB0000-0x0000000075561000-memory.dmp
memory/1280-8-0x0000000074FB0000-0x0000000075561000-memory.dmp
Analysis: behavioral4
Detonation Overview
Submitted
2024-02-24 13:05
Reported
2024-02-24 13:06
Platform
android-x86-arm-20240221-en
Max time network
4s
Command Line
Signatures
Processes
Network
| Country | Destination | Domain | Proto |
| N/A | 224.0.0.251:5353 | udp |
Files
Analysis: behavioral5
Detonation Overview
Submitted
2024-02-24 13:05
Reported
2024-02-24 13:06
Platform
android-x64-20240221-en
Max time network
6s
Command Line
Signatures
Processes
Network
| Country | Destination | Domain | Proto |
| N/A | 224.0.0.251:5353 | udp |
Files
Analysis: behavioral6
Detonation Overview
Submitted
2024-02-24 13:05
Reported
2024-02-24 13:06
Platform
android-x64-arm64-20240221-en
Max time network
7s
Command Line
Signatures
Processes
Network
| Country | Destination | Domain | Proto |
| N/A | 224.0.0.251:5353 | udp | |
| GB | 216.58.212.238:443 | udp |