Analysis Overview
SHA256
bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658
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
Unsigned PE
Creates scheduled task(s)
Uses Task Scheduler COM API
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-04-10 11:18
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
2024-04-10 11:18
Reported
2024-04-10 11:20
Platform
win7-20240221-en
Max time kernel
129s
Max time network
143s
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 |
| 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 |
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:\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 | 192.168.0.115:4782 | tcp | |
| N/A | 192.168.0.115:4782 | tcp | |
| N/A | 192.168.0.115:4782 | tcp | |
| N/A | 192.168.0.115:4782 | tcp | |
| N/A | 192.168.0.115:4782 | tcp | |
| N/A | 192.168.0.115:4782 | tcp |
Files
memory/3012-0-0x0000000000C00000-0x0000000000F24000-memory.dmp
memory/3012-1-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp
memory/3012-2-0x000000001B0D0000-0x000000001B150000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 23aaf5e0d106b0f8ce7b98ebb248fa35 |
| SHA1 | 898101610b796f5d50de183a04ff029dbc6be064 |
| SHA256 | bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658 |
| SHA512 | d1d88cbe426ee916cd4f64aa2dd1a6efd1ab223c7e7d191feb4d2653b6886f8bf1cbf5e07184e3854571575e0b10da6ed016efd61c5c3e5f9bcde865e03b2b40 |
memory/2556-7-0x0000000000D70000-0x0000000001094000-memory.dmp
memory/2556-8-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp
memory/2556-9-0x000000001B2F0000-0x000000001B370000-memory.dmp
memory/3012-10-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp
memory/2556-11-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp
memory/2556-12-0x000000001B2F0000-0x000000001B370000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-04-10 11:18
Reported
2024-04-10 11:20
Platform
win10v2004-20240226-en
Max time kernel
149s
Max time network
142s
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:\Users\Admin\AppData\Roaming\SubDir\Client.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:\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 752 wrote to memory of 2096 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 752 wrote to memory of 2096 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 752 wrote to memory of 980 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 752 wrote to memory of 980 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 980 wrote to memory of 1012 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 980 wrote to memory of 1012 | 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 | 0.204.248.87.in-addr.arpa | udp |
| N/A | 192.168.0.115:4782 | tcp | |
| US | 8.8.8.8:53 | 23.159.190.20.in-addr.arpa | udp |
| N/A | 192.168.0.115:4782 | tcp | |
| US | 8.8.8.8:53 | 86.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 18.31.95.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 17.14.97.104.in-addr.arpa | udp |
| NL | 52.142.223.178:80 | tcp | |
| N/A | 192.168.0.115:4782 | tcp | |
| US | 8.8.8.8:53 | 249.197.17.2.in-addr.arpa | udp |
| N/A | 192.168.0.115:4782 | tcp | |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 31.243.111.52.in-addr.arpa | udp |
| N/A | 192.168.0.115:4782 | tcp | |
| N/A | 192.168.0.115:4782 | tcp | |
| N/A | 192.168.0.115:4782 | tcp |
Files
memory/752-0-0x0000000000900000-0x0000000000C24000-memory.dmp
memory/752-1-0x00007FFD292A0000-0x00007FFD29D61000-memory.dmp
memory/752-2-0x0000000001540000-0x0000000001550000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 23aaf5e0d106b0f8ce7b98ebb248fa35 |
| SHA1 | 898101610b796f5d50de183a04ff029dbc6be064 |
| SHA256 | bf4b331a3329acc0925ed37d55dc9ff54934eeaa30547e4221ae8c10aa5b1658 |
| SHA512 | d1d88cbe426ee916cd4f64aa2dd1a6efd1ab223c7e7d191feb4d2653b6886f8bf1cbf5e07184e3854571575e0b10da6ed016efd61c5c3e5f9bcde865e03b2b40 |
memory/752-8-0x00007FFD292A0000-0x00007FFD29D61000-memory.dmp
memory/980-9-0x00007FFD292A0000-0x00007FFD29D61000-memory.dmp
memory/980-10-0x000000001BA10000-0x000000001BA20000-memory.dmp
memory/980-11-0x000000001C160000-0x000000001C1B0000-memory.dmp
memory/980-12-0x000000001C270000-0x000000001C322000-memory.dmp
memory/980-13-0x00007FFD292A0000-0x00007FFD29D61000-memory.dmp
memory/980-14-0x000000001BA10000-0x000000001BA20000-memory.dmp