Analysis Overview
SHA256
d12b9712632f295c168fc1ec4dd0748b8e885844ef7d806240d6cdb49170ada2
Threat Level: Known bad
The file Server.exe was found to be: Known bad.
Malicious Activity Summary
Njrat family
Modifies Windows Firewall
Executes dropped EXE
Drops startup file
Legitimate hosting services abused for malware hosting/C2
Adds Run key to start application
Drops autorun.inf file
Unsigned PE
Enumerates physical storage devices
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
2024-04-27 20:44
Signatures
Njrat family
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-04-27 20:44
Reported
2024-04-27 20:45
Platform
win11-20240419-en
Max time kernel
45s
Max time network
45s
Command Line
Signatures
Modifies Windows Firewall
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\netsh.exe | N/A |
Drops startup file
| Description | Indicator | Process | Target |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\6ffa764c880d15862b6efba9985fcc07.exe | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\6ffa764c880d15862b6efba9985fcc07.exe | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-734199974-1358367239-436541239-1000\Software\Microsoft\Windows\CurrentVersion\Run\6ffa764c880d15862b6efba9985fcc07 = "\"C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe\" .." | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\6ffa764c880d15862b6efba9985fcc07 = "\"C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe\" .." | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
Legitimate hosting services abused for malware hosting/C2
| Description | Indicator | Process | Target |
| N/A | 2.tcp.eu.ngrok.io | N/A | N/A |
| N/A | 2.tcp.eu.ngrok.io | N/A | N/A |
| N/A | 2.tcp.eu.ngrok.io | N/A | N/A |
Drops autorun.inf file
| Description | Indicator | Process | Target |
| File created | C:\autorun.inf | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| File opened for modification | C:\autorun.inf | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| File created | D:\autorun.inf | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| File created | F:\autorun.inf | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| File opened for modification | F:\autorun.inf | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
Enumerates physical storage devices
Kills process with taskkill
| Description | Indicator | Process | Target |
| 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\Roaming\svchost.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\SysWOW64\taskkill.exe | N/A |
| Token: 33 | N/A | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| Token: SeIncBasePriorityPrivilege | N/A | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| Token: 33 | N/A | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| Token: SeIncBasePriorityPrivilege | N/A | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| Token: 33 | N/A | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| Token: SeIncBasePriorityPrivilege | N/A | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| Token: 33 | N/A | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
| Token: SeIncBasePriorityPrivilege | N/A | C:\Users\Admin\AppData\Roaming\svchost.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\Server.exe
"C:\Users\Admin\AppData\Local\Temp\Server.exe"
C:\Users\Admin\AppData\Roaming\svchost.exe
"C:\Users\Admin\AppData\Roaming\svchost.exe"
C:\Windows\SysWOW64\netsh.exe
netsh firewall add allowedprogram "C:\Users\Admin\AppData\Roaming\svchost.exe" "svchost.exe" ENABLE
C:\Windows\SysWOW64\taskkill.exe
taskkill /F /IM Taskmgr.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 2.tcp.eu.ngrok.io | udp |
| US | 8.8.8.8:53 | 8.8.8.8.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 2.tcp.eu.ngrok.io | udp |
| US | 8.8.8.8:53 | 2.tcp.eu.ngrok.io | udp |
Files
memory/3932-0-0x00000000750D0000-0x0000000075681000-memory.dmp
memory/3932-1-0x0000000001620000-0x0000000001630000-memory.dmp
memory/3932-2-0x00000000750D0000-0x0000000075681000-memory.dmp
C:\Users\Admin\AppData\Roaming\svchost.exe
| MD5 | 897835e99a4f3b044a3a788b65e20994 |
| SHA1 | 7bf5f2cbb3ac82f0af042d09f61ca02acaf29389 |
| SHA256 | d12b9712632f295c168fc1ec4dd0748b8e885844ef7d806240d6cdb49170ada2 |
| SHA512 | 6190a1ed2843419cd44b42ead10c74e6c434156dd1decccf71d34fd1a4be7c7b15ac4099283a089b94b9640cad97720a3833efbff7977fbfdeca6afc7e208432 |
memory/3932-12-0x00000000750D0000-0x0000000075681000-memory.dmp
memory/4276-13-0x00000000750D0000-0x0000000075681000-memory.dmp
memory/4276-23-0x00000000750D0000-0x0000000075681000-memory.dmp