Analysis Overview
SHA256
0268b6f80286ff64286d42529c76f9e744932ca5a650b7e9ef2c3c0afc01af79
Threat Level: Known bad
The file mainn.exe was found to be: Known bad.
Malicious Activity Summary
Quasar family
Quasar payload
Quasar RAT
Executes dropped EXE
Drops file in System32 directory
Unsigned PE
Uses Task Scheduler COM API
Suspicious use of WriteProcessMemory
Suspicious use of FindShellTrayWindow
Modifies registry class
Suspicious behavior: EnumeratesProcesses
Checks SCSI registry key(s)
Creates scheduled task(s)
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of SendNotifyMessage
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-04-17 11:27
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
2024-04-17 11:27
Reported
2024-04-17 11:30
Platform
win11-20240412-en
Max time kernel
142s
Max time network
164s
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\Conhost.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system32\SubDir | C:\Windows\system32\SubDir\Conhost.exe | N/A |
| File created | C:\Windows\system32\SubDir\Conhost.exe | C:\Users\Admin\AppData\Local\Temp\mainn.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Conhost.exe | C:\Users\Admin\AppData\Local\Temp\mainn.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir | C:\Users\Admin\AppData\Local\Temp\mainn.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Conhost.exe | C:\Windows\system32\SubDir\Conhost.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\mainn.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\SubDir\Conhost.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Conhost.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1248 wrote to memory of 2684 | N/A | C:\Users\Admin\AppData\Local\Temp\mainn.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1248 wrote to memory of 2684 | N/A | C:\Users\Admin\AppData\Local\Temp\mainn.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1248 wrote to memory of 944 | N/A | C:\Users\Admin\AppData\Local\Temp\mainn.exe | C:\Windows\system32\SubDir\Conhost.exe |
| PID 1248 wrote to memory of 944 | N/A | C:\Users\Admin\AppData\Local\Temp\mainn.exe | C:\Windows\system32\SubDir\Conhost.exe |
| PID 944 wrote to memory of 3012 | N/A | C:\Windows\system32\SubDir\Conhost.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 944 wrote to memory of 3012 | N/A | C:\Windows\system32\SubDir\Conhost.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\mainn.exe
"C:\Users\Admin\AppData\Local\Temp\mainn.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Google Chrome" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Conhost.exe" /rl HIGHEST /f
C:\Windows\system32\SubDir\Conhost.exe
"C:\Windows\system32\SubDir\Conhost.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Google Chrome" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Conhost.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 0.205.248.87.in-addr.arpa | udp |
| N/A | 192.168.12.185:4782 | tcp | |
| N/A | 192.168.12.185:4782 | tcp | |
| N/A | 192.168.12.185:4782 | tcp | |
| N/A | 192.168.12.185:4782 | tcp | |
| N/A | 192.168.12.185:4782 | tcp | |
| N/A | 192.168.12.185:4782 | tcp |
Files
memory/1248-0-0x00000000008C0000-0x0000000000C08000-memory.dmp
memory/1248-1-0x00007FFDA74C0000-0x00007FFDA7F82000-memory.dmp
memory/1248-2-0x000000001B870000-0x000000001B880000-memory.dmp
C:\Windows\System32\SubDir\Conhost.exe
| MD5 | 88daabfadfec7379a7b25ff1602dd7bd |
| SHA1 | 65c3f35d7150df340ca797a2662437933178c9b5 |
| SHA256 | 0268b6f80286ff64286d42529c76f9e744932ca5a650b7e9ef2c3c0afc01af79 |
| SHA512 | 7a205e62c3608fcad774dea6384ae7da904a2ba090b9b6f30454bd23eab9f54a1dbaffd72c3534c554c468a5efaa90d75f659e74fdba3ee8581cbb9356c68aa2 |
memory/1248-9-0x00007FFDA74C0000-0x00007FFDA7F82000-memory.dmp
memory/944-10-0x00007FFDA74C0000-0x00007FFDA7F82000-memory.dmp
memory/944-11-0x0000000002AD0000-0x0000000002AE0000-memory.dmp
memory/944-12-0x000000001BEB0000-0x000000001BF00000-memory.dmp
memory/944-13-0x000000001BFC0000-0x000000001C072000-memory.dmp
memory/944-14-0x00007FFDA74C0000-0x00007FFDA7F82000-memory.dmp
memory/944-15-0x0000000002AD0000-0x0000000002AE0000-memory.dmp
Analysis: behavioral1
Detonation Overview
Submitted
2024-04-17 11:27
Reported
2024-04-17 11:29
Platform
win10v2004-20240412-en
Max time kernel
79s
Max time network
80s
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\Conhost.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system32\SubDir\Conhost.exe | C:\Windows\system32\SubDir\Conhost.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir | C:\Windows\system32\SubDir\Conhost.exe | N/A |
| File created | C:\Windows\system32\SubDir\Conhost.exe | C:\Users\Admin\AppData\Local\Temp\mainn.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Conhost.exe | C:\Users\Admin\AppData\Local\Temp\mainn.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir | C:\Users\Admin\AppData\Local\Temp\mainn.exe | N/A |
Checks SCSI registry key(s)
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000 | C:\Windows\system32\taskmgr.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&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_DADY&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 |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-4084619521-2220719027-1909462854-1000_Classes\Local Settings | C:\Windows\system32\taskmgr.exe | N/A |
| Key created | \REGISTRY\USER\S-1-5-21-4084619521-2220719027-1909462854-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell | C:\Windows\system32\taskmgr.exe | N/A |
| Key created | \REGISTRY\USER\S-1-5-21-4084619521-2220719027-1909462854-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU | C:\Windows\system32\taskmgr.exe | N/A |
| Set value (data) | \REGISTRY\USER\S-1-5-21-4084619521-2220719027-1909462854-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots | C:\Windows\system32\taskmgr.exe | N/A |
| Set value (data) | \REGISTRY\USER\S-1-5-21-4084619521-2220719027-1909462854-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff | C:\Windows\system32\taskmgr.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\mainn.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\SubDir\Conhost.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 SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Conhost.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 4040 wrote to memory of 1056 | N/A | C:\Users\Admin\AppData\Local\Temp\mainn.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4040 wrote to memory of 1056 | N/A | C:\Users\Admin\AppData\Local\Temp\mainn.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4040 wrote to memory of 3216 | N/A | C:\Users\Admin\AppData\Local\Temp\mainn.exe | C:\Windows\system32\SubDir\Conhost.exe |
| PID 4040 wrote to memory of 3216 | N/A | C:\Users\Admin\AppData\Local\Temp\mainn.exe | C:\Windows\system32\SubDir\Conhost.exe |
| PID 3216 wrote to memory of 1004 | N/A | C:\Windows\system32\SubDir\Conhost.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3216 wrote to memory of 1004 | N/A | C:\Windows\system32\SubDir\Conhost.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\mainn.exe
"C:\Users\Admin\AppData\Local\Temp\mainn.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Google Chrome" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Conhost.exe" /rl HIGHEST /f
C:\Windows\system32\SubDir\Conhost.exe
"C:\Windows\system32\SubDir\Conhost.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Google Chrome" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Conhost.exe" /rl HIGHEST /f
C:\Windows\system32\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /7
C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 23.159.190.20.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 | 9.228.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 233.143.123.92.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 237.197.79.204.in-addr.arpa | udp |
| N/A | 192.168.12.185:4782 | tcp | |
| US | 8.8.8.8:53 | 21.114.53.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 241.197.17.2.in-addr.arpa | udp |
| N/A | 192.168.12.185:4782 | tcp | |
| US | 8.8.8.8:53 | 26.165.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 198.187.3.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 0.205.248.87.in-addr.arpa | udp |
| N/A | 192.168.12.185:4782 | tcp | |
| US | 8.8.8.8:53 | 249.197.17.2.in-addr.arpa | udp |
| N/A | 192.168.12.185:4782 | tcp |
Files
memory/4040-0-0x00000000009F0000-0x0000000000D38000-memory.dmp
memory/4040-1-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp
memory/4040-2-0x00000000014F0000-0x0000000001500000-memory.dmp
C:\Windows\System32\SubDir\Conhost.exe
| MD5 | 88daabfadfec7379a7b25ff1602dd7bd |
| SHA1 | 65c3f35d7150df340ca797a2662437933178c9b5 |
| SHA256 | 0268b6f80286ff64286d42529c76f9e744932ca5a650b7e9ef2c3c0afc01af79 |
| SHA512 | 7a205e62c3608fcad774dea6384ae7da904a2ba090b9b6f30454bd23eab9f54a1dbaffd72c3534c554c468a5efaa90d75f659e74fdba3ee8581cbb9356c68aa2 |
memory/4040-9-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp
memory/3216-10-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp
memory/3216-11-0x000000001B9A0000-0x000000001B9B0000-memory.dmp
memory/3216-12-0x000000001C140000-0x000000001C190000-memory.dmp
memory/3216-13-0x000000001C250000-0x000000001C302000-memory.dmp
memory/3216-14-0x000000001C940000-0x000000001CE68000-memory.dmp
memory/4840-16-0x000001D2D0990000-0x000001D2D0991000-memory.dmp
memory/4840-17-0x000001D2D0990000-0x000001D2D0991000-memory.dmp
memory/4840-18-0x000001D2D0990000-0x000001D2D0991000-memory.dmp
memory/4840-22-0x000001D2D0990000-0x000001D2D0991000-memory.dmp
memory/4840-23-0x000001D2D0990000-0x000001D2D0991000-memory.dmp
memory/4840-25-0x000001D2D0990000-0x000001D2D0991000-memory.dmp
memory/4840-24-0x000001D2D0990000-0x000001D2D0991000-memory.dmp
memory/4840-27-0x000001D2D0990000-0x000001D2D0991000-memory.dmp
memory/4840-26-0x000001D2D0990000-0x000001D2D0991000-memory.dmp
memory/4840-28-0x000001D2D0990000-0x000001D2D0991000-memory.dmp
memory/3216-29-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp
memory/3216-30-0x000000001B9A0000-0x000000001B9B0000-memory.dmp