Analysis Overview
SHA256
796d5a37143cb32778bab8b2210e35c22d75bfaf2368323b0d2400ace4ded468
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 Windows directory
Unsigned PE
Suspicious use of AdjustPrivilegeToken
Suspicious use of SendNotifyMessage
Suspicious use of FindShellTrayWindow
Suspicious behavior: GetForegroundWindowSpam
Checks SCSI registry key(s)
Creates scheduled task(s)
Uses Task Scheduler COM API
Suspicious behavior: EnumeratesProcesses
Suspicious use of WriteProcessMemory
Suspicious use of SetWindowsHookEx
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-04-13 19:15
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
2024-04-13 19:15
Reported
2024-04-13 19:18
Platform
win10-20240404-en
Max time kernel
150s
Max time network
141s
Command Line
Signatures
Quasar RAT
Quasar payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Drops file in Windows directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\rescache\_merged\4183903823\2290032291.pri | C:\Windows\system32\taskmgr.exe | N/A |
| File created | C:\Windows\rescache\_merged\1601268389\715946058.pri | C:\Windows\system32\taskmgr.exe | N/A |
Checks SCSI registry key(s)
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_QEMU&Prod_HARDDISK\4&215468a5&0&000000 | C:\Windows\system32\taskmgr.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_QEMU&Prod_HARDDISK\4&215468a5&0&000000\Properties\{b725f130-47ef-101a-a5f1-02608c9eebac}\000A | C:\Windows\system32\taskmgr.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_QEMU&Prod_HARDDISK\4&215468a5&0&000000\FriendlyName | C:\Windows\system32\taskmgr.exe | N/A |
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\taskmgr.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\taskmgr.exe | N/A |
| Token: SeSystemProfilePrivilege | N/A | C:\Windows\system32\taskmgr.exe | N/A |
| Token: SeCreateGlobalPrivilege | N/A | C:\Windows\system32\taskmgr.exe | N/A |
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 3964 wrote to memory of 4548 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3964 wrote to memory of 4548 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.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:\Windows\system32\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /4
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 14.227.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 106.246.116.51.in-addr.arpa | udp |
Files
memory/3964-0-0x0000000000820000-0x0000000000B44000-memory.dmp
memory/3964-1-0x00007FF8F9630000-0x00007FF8FA01C000-memory.dmp
memory/3964-2-0x000000001B9F0000-0x000000001BA00000-memory.dmp
memory/3964-9-0x00007FF8F9630000-0x00007FF8FA01C000-memory.dmp
memory/3964-10-0x000000001B9F0000-0x000000001BA00000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-04-13 19:15
Reported
2024-04-13 19:18
Platform
win10v2004-20240412-en
Max time kernel
147s
Max time network
151s
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 2404 wrote to memory of 3032 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2404 wrote to memory of 3032 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2404 wrote to memory of 4072 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 2404 wrote to memory of 4072 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 4072 wrote to memory of 4532 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4072 wrote to memory of 4532 | 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 | 8.8.8.8.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 75.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | g.bing.com | udp |
| US | 204.79.197.237:443 | g.bing.com | tcp |
| US | 8.8.8.8:53 | 249.197.17.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 241.154.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | LunasLove-64385.portmap.host | udp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| US | 8.8.8.8:53 | 237.197.79.204.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 43.58.199.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 21.114.53.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| US | 8.8.8.8:53 | 86.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 206.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 130.118.77.104.in-addr.arpa | udp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| US | 8.8.8.8:53 | 22.236.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.210.232.199.in-addr.arpa | udp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
Files
memory/2404-0-0x00000000000B0000-0x00000000003D4000-memory.dmp
memory/2404-1-0x00007FF8519B0000-0x00007FF852471000-memory.dmp
memory/2404-2-0x000000001B120000-0x000000001B130000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 61a794936ec8a32416ab054556f6270e |
| SHA1 | 08f16c442752f65c04b8452642fd7b6102314fb0 |
| SHA256 | 796d5a37143cb32778bab8b2210e35c22d75bfaf2368323b0d2400ace4ded468 |
| SHA512 | 8000d3dfca0ef4daca77ad968af0c0ff496de9da59ffa5168479b0dcbd792ce5f1ea620cf0ff51d2bff1613383c3a3feeeccf1e07af963c199cb1d10e4d37988 |
memory/2404-9-0x00007FF8519B0000-0x00007FF852471000-memory.dmp
memory/4072-10-0x00007FF8519B0000-0x00007FF852471000-memory.dmp
memory/4072-11-0x000000001B910000-0x000000001B920000-memory.dmp
memory/4072-12-0x000000001B8C0000-0x000000001B910000-memory.dmp
memory/4072-13-0x000000001BFE0000-0x000000001C092000-memory.dmp
memory/4072-14-0x00007FF8519B0000-0x00007FF852471000-memory.dmp
memory/4072-15-0x000000001B910000-0x000000001B920000-memory.dmp
Analysis: behavioral3
Detonation Overview
Submitted
2024-04-13 19:15
Reported
2024-04-13 19:18
Platform
win11-20240412-en
Max time kernel
147s
Max time network
153s
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 8 wrote to memory of 2352 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 8 wrote to memory of 2352 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 8 wrote to memory of 1532 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 8 wrote to memory of 1532 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 1532 wrote to memory of 3928 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1532 wrote to memory of 3928 | 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 | LunasLove-64385.portmap.host | udp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| NL | 52.111.243.29:443 | tcp | |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
| DE | 193.161.193.99:64285 | LunasLove-64385.portmap.host | tcp |
Files
memory/8-0-0x0000000000C20000-0x0000000000F44000-memory.dmp
memory/8-1-0x00007FFE4E4D0000-0x00007FFE4EF92000-memory.dmp
memory/8-2-0x000000001BCC0000-0x000000001BCD0000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 61a794936ec8a32416ab054556f6270e |
| SHA1 | 08f16c442752f65c04b8452642fd7b6102314fb0 |
| SHA256 | 796d5a37143cb32778bab8b2210e35c22d75bfaf2368323b0d2400ace4ded468 |
| SHA512 | 8000d3dfca0ef4daca77ad968af0c0ff496de9da59ffa5168479b0dcbd792ce5f1ea620cf0ff51d2bff1613383c3a3feeeccf1e07af963c199cb1d10e4d37988 |
memory/8-9-0x00007FFE4E4D0000-0x00007FFE4EF92000-memory.dmp
memory/1532-10-0x00007FFE4E4D0000-0x00007FFE4EF92000-memory.dmp
memory/1532-11-0x000000001BCC0000-0x000000001BCD0000-memory.dmp
memory/1532-12-0x000000001BC30000-0x000000001BC80000-memory.dmp
memory/1532-13-0x000000001C880000-0x000000001C932000-memory.dmp
memory/1532-14-0x00007FFE4E4D0000-0x00007FFE4EF92000-memory.dmp
memory/1532-15-0x000000001BCC0000-0x000000001BCD0000-memory.dmp