Analysis Overview
SHA256
97cd6ad3a56efc266ba1860e2d1c5958094b988be74bd36e9499d22fdaed9c59
Threat Level: Known bad
The file Client-built.exe was found to be: Known bad.
Malicious Activity Summary
Quasar family
Quasar RAT
Quasar payload
Executes dropped EXE
Drops file in System32 directory
Unsigned PE
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Creates scheduled task(s)
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-04-19 22:32
Signatures
Quasar family
Quasar payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral2
Detonation Overview
Submitted
2024-04-19 22:32
Reported
2024-04-19 22:42
Platform
win10v2004-20240412-en
Max time kernel
565s
Max time network
576s
Command Line
Signatures
Quasar RAT
Quasar payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1508 wrote to memory of 1640 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1508 wrote to memory of 1640 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1508 wrote to memory of 3508 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 1508 wrote to memory of 3508 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 3508 wrote to memory of 2444 | N/A | C:\Windows\system32\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3508 wrote to memory of 2444 | N/A | C:\Windows\system32\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
C:\Windows\system32\SubDir\Client.exe
"C:\Windows\system32\SubDir\Client.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 2.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 241.150.49.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.210.232.199.in-addr.arpa | udp |
| US | 8.8.8.8:53 | g.bing.com | udp |
| US | 204.79.197.237:443 | g.bing.com | tcp |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 8.8.8.8:53 | 9.228.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 237.197.79.204.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 206.221.208.4.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 26.165.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 198.32.209.4.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 21.114.53.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 154.239.44.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 206.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 228.249.119.40.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 8.8.8.8:53 | 154.173.246.72.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 119.110.54.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.197.17.2.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 8.8.8.8:53 | 14.251.17.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 0.205.248.87.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 8.8.8.8:53 | 13.227.111.52.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp | |
| 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 |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 8.8.8.8:53 | 208.14.97.104.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 8.8.8.8:53 | 23.173.189.20.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 8.8.8.8:53 | 217.14.97.104.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 138.91.171.81:80 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp |
Files
memory/1508-0-0x0000000000B90000-0x0000000000EB4000-memory.dmp
memory/1508-1-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp
memory/1508-2-0x00000000030A0000-0x00000000030B0000-memory.dmp
C:\Windows\System32\SubDir\Client.exe
| MD5 | 491d53dcfb36c12d0077bbb926f24d02 |
| SHA1 | 4e35320259495d99e3d9fbc03aeea39c93c3a051 |
| SHA256 | 97cd6ad3a56efc266ba1860e2d1c5958094b988be74bd36e9499d22fdaed9c59 |
| SHA512 | 7f9a8134032cb437278422d7f0ea123e68146fc5f6f3de693592b96620669eb36696625235fddbebae0949e9ddbbd4d8f694c61f16489a38322d90149f70553b |
memory/1508-8-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp
memory/3508-9-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp
memory/3508-10-0x000000001B9B0000-0x000000001B9C0000-memory.dmp
memory/3508-11-0x000000001B9C0000-0x000000001BA10000-memory.dmp
memory/3508-12-0x000000001C320000-0x000000001C3D2000-memory.dmp
memory/3508-13-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp
memory/3508-14-0x000000001B9B0000-0x000000001B9C0000-memory.dmp
Analysis: behavioral3
Detonation Overview
Submitted
2024-04-19 22:32
Reported
2024-04-19 22:35
Platform
win11-20240412-en
Max time kernel
125s
Max time network
145s
Command Line
Signatures
Quasar RAT
Quasar payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2056 wrote to memory of 4300 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2056 wrote to memory of 4300 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2056 wrote to memory of 3944 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 2056 wrote to memory of 3944 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 3944 wrote to memory of 2016 | N/A | C:\Windows\system32\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3944 wrote to memory of 2016 | N/A | C:\Windows\system32\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
C:\Windows\system32\SubDir\Client.exe
"C:\Windows\system32\SubDir\Client.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| IE | 52.111.236.23:443 | tcp | |
| US | 8.8.8.8:53 | 13.227.111.52.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp |
Files
memory/2056-0-0x0000000000710000-0x0000000000A34000-memory.dmp
memory/2056-1-0x00007FF93BA50000-0x00007FF93C512000-memory.dmp
memory/2056-2-0x000000001B6D0000-0x000000001B6E0000-memory.dmp
C:\Windows\System32\SubDir\Client.exe
| MD5 | 491d53dcfb36c12d0077bbb926f24d02 |
| SHA1 | 4e35320259495d99e3d9fbc03aeea39c93c3a051 |
| SHA256 | 97cd6ad3a56efc266ba1860e2d1c5958094b988be74bd36e9499d22fdaed9c59 |
| SHA512 | 7f9a8134032cb437278422d7f0ea123e68146fc5f6f3de693592b96620669eb36696625235fddbebae0949e9ddbbd4d8f694c61f16489a38322d90149f70553b |
memory/3944-9-0x00007FF93BA50000-0x00007FF93C512000-memory.dmp
memory/2056-8-0x00007FF93BA50000-0x00007FF93C512000-memory.dmp
memory/3944-10-0x000000001BB70000-0x000000001BB80000-memory.dmp
memory/3944-11-0x000000001BAE0000-0x000000001BB30000-memory.dmp
memory/3944-12-0x000000001C4B0000-0x000000001C562000-memory.dmp
memory/3944-13-0x00007FF93BA50000-0x00007FF93C512000-memory.dmp
Analysis: behavioral1
Detonation Overview
Submitted
2024-04-19 22:32
Reported
2024-04-19 22:35
Platform
win10-20240404-en
Max time kernel
150s
Max time network
140s
Command Line
Signatures
Quasar RAT
Quasar payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 4392 wrote to memory of 212 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4392 wrote to memory of 212 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4392 wrote to memory of 804 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 4392 wrote to memory of 804 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 804 wrote to memory of 2304 | N/A | C:\Windows\system32\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 804 wrote to memory of 2304 | N/A | C:\Windows\system32\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
C:\Windows\system32\SubDir\Client.exe
"C:\Windows\system32\SubDir\Client.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| IE | 52.111.236.23:443 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 8.8.8.8:53 | 43.229.111.52.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 8.8.8.8:53 | 14.173.189.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.210.232.199.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp |
Files
memory/4392-0-0x0000000000350000-0x0000000000674000-memory.dmp
memory/4392-1-0x00007FFDDF720000-0x00007FFDE010C000-memory.dmp
memory/4392-2-0x0000000000F50000-0x0000000000F60000-memory.dmp
C:\Windows\System32\SubDir\Client.exe
| MD5 | 491d53dcfb36c12d0077bbb926f24d02 |
| SHA1 | 4e35320259495d99e3d9fbc03aeea39c93c3a051 |
| SHA256 | 97cd6ad3a56efc266ba1860e2d1c5958094b988be74bd36e9499d22fdaed9c59 |
| SHA512 | 7f9a8134032cb437278422d7f0ea123e68146fc5f6f3de693592b96620669eb36696625235fddbebae0949e9ddbbd4d8f694c61f16489a38322d90149f70553b |
memory/4392-8-0x00007FFDDF720000-0x00007FFDE010C000-memory.dmp
memory/804-9-0x00007FFDDF720000-0x00007FFDE010C000-memory.dmp
memory/804-10-0x000000001BC30000-0x000000001BC40000-memory.dmp
memory/804-11-0x000000001C300000-0x000000001C350000-memory.dmp
memory/804-12-0x000000001C410000-0x000000001C4C2000-memory.dmp
memory/804-13-0x00007FFDDF720000-0x00007FFDE010C000-memory.dmp
memory/804-14-0x000000001BC30000-0x000000001BC40000-memory.dmp