Analysis Overview
SHA256
89fa63d15ed2d1efecb7cea57600721b74f90e2f83e213f556759e788133a75d
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
Enumerates physical storage devices
Unsigned PE
Suspicious use of SendNotifyMessage
Scheduled Task/Job: Scheduled Task
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-12-13 09:59
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: behavioral1
Detonation Overview
Submitted
2024-12-13 09:59
Reported
2024-12-13 10:01
Platform
win7-20241010-en
Max time kernel
131s
Max time network
144s
Command Line
Signatures
Quasar RAT
Quasar family
Quasar payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| 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:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Enumerates physical storage devices
Scheduled Task/Job: Scheduled Task
| 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:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| N/A | 192.168.181.84:4782 | tcp | |
| N/A | 192.168.181.84:4782 | tcp | |
| N/A | 192.168.181.84:4782 | tcp | |
| N/A | 192.168.181.84:4782 | tcp | |
| N/A | 192.168.181.84:4782 | tcp | |
| N/A | 192.168.181.84:4782 | tcp |
Files
memory/432-0-0x000007FEF65A3000-0x000007FEF65A4000-memory.dmp
memory/432-1-0x0000000001270000-0x0000000001594000-memory.dmp
memory/432-2-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 6d6b0853a2aac3f0fe8403826e778cfd |
| SHA1 | 2a7d910997330b2e00555252603b725af6a9a8bb |
| SHA256 | 89fa63d15ed2d1efecb7cea57600721b74f90e2f83e213f556759e788133a75d |
| SHA512 | 2d1b1af0c174c85f0c0be5f946a71826c8d18489d7b6c8a8f8d09a9709f1669c232e270fbce945d04740c5cfabf46e17e17a291d263c537a04dda8932e40ec28 |
memory/2880-9-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp
memory/432-8-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp
memory/2880-10-0x0000000000EE0000-0x0000000001204000-memory.dmp
memory/2880-11-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp
memory/2880-12-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-12-13 09:59
Reported
2024-12-13 10:01
Platform
win10v2004-20241007-en
Max time kernel
149s
Max time network
151s
Command Line
Signatures
Quasar RAT
Quasar family
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:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Enumerates physical storage devices
Scheduled Task/Job: Scheduled Task
| 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:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1100 wrote to memory of 3528 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1100 wrote to memory of 3528 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1100 wrote to memory of 3356 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 1100 wrote to memory of 3356 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 3356 wrote to memory of 5028 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3356 wrote to memory of 5028 | N/A | C:\Users\Admin\AppData\Roaming\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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 97.17.167.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.214.232.199.in-addr.arpa | udp |
| N/A | 192.168.181.84:4782 | tcp | |
| US | 8.8.8.8:53 | 67.31.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 196.249.167.52.in-addr.arpa | udp |
| N/A | 192.168.181.84:4782 | tcp | |
| US | 8.8.8.8:53 | 53.210.109.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 18.31.95.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 107.12.20.2.in-addr.arpa | udp |
| N/A | 192.168.181.84:4782 | tcp | |
| US | 8.8.8.8:53 | 24.125.209.23.in-addr.arpa | udp |
| N/A | 192.168.181.84:4782 | tcp | |
| US | 8.8.8.8:53 | 25.125.209.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 13.227.111.52.in-addr.arpa | udp |
| N/A | 192.168.181.84:4782 | tcp | |
| N/A | 192.168.181.84:4782 | tcp | |
| N/A | 192.168.181.84:4782 | tcp |
Files
memory/1100-0-0x00007FFA102C3000-0x00007FFA102C5000-memory.dmp
memory/1100-1-0x0000000000E90000-0x00000000011B4000-memory.dmp
memory/1100-2-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 6d6b0853a2aac3f0fe8403826e778cfd |
| SHA1 | 2a7d910997330b2e00555252603b725af6a9a8bb |
| SHA256 | 89fa63d15ed2d1efecb7cea57600721b74f90e2f83e213f556759e788133a75d |
| SHA512 | 2d1b1af0c174c85f0c0be5f946a71826c8d18489d7b6c8a8f8d09a9709f1669c232e270fbce945d04740c5cfabf46e17e17a291d263c537a04dda8932e40ec28 |
memory/1100-9-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp
memory/3356-10-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp
memory/3356-11-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp
memory/3356-12-0x000000001C080000-0x000000001C0D0000-memory.dmp
memory/3356-13-0x000000001C190000-0x000000001C242000-memory.dmp
memory/3356-14-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp