Analysis Overview
SHA256
788c859458ab91850978e27a2591b564e5e3200eede844362bf465944db9d92c
Threat Level: Known bad
The file HEUR-Trojan.MSIL.Quasar.gen-788c859458ab91850978e27a2591b564e5e3200eede844362bf465944db9d92c was found to be: Known bad.
Malicious Activity Summary
Quasar family
Quasar RAT
Detects executables containing common artifacts observed in infostealers
Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.
Detects Windows executables referencing non-Windows User-Agents
Quasar payload
Detects Windows executables referencing non-Windows User-Agents
Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.
Detects executables containing common artifacts observed in infostealers
Executes dropped EXE
Adds Run key to start application
Unsigned PE
Uses Task Scheduler COM API
Suspicious use of WriteProcessMemory
Suspicious use of SendNotifyMessage
Suspicious use of FindShellTrayWindow
Suspicious use of AdjustPrivilegeToken
Creates scheduled task(s)
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-04-15 03:28
Signatures
Detects Windows executables referencing non-Windows User-Agents
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Detects executables containing common artifacts observed in infostealers
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
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
2024-04-15 03:28
Reported
2024-04-15 03:31
Platform
win7-20240221-en
Max time kernel
129s
Max time network
141s
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 |
Detects Windows executables referencing non-Windows User-Agents
| 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 |
Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.
| 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 |
Detects executables containing common artifacts observed in infostealers
| 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 |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000\Software\Microsoft\Windows\CurrentVersion\Run\:) = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" | C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000\Software\Microsoft\Windows\CurrentVersion\Run\:) = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" | 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\HEUR-Trojan.MSIL.Quasar.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 WriteProcessMemory
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe
"C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn ":)" /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 ":)" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| ES | 85.219.48.223:6969 | tcp | |
| ES | 85.219.48.223:6969 | tcp | |
| ES | 85.219.48.223:6969 | tcp | |
| ES | 85.219.48.223:6969 | tcp | |
| ES | 85.219.48.223:6969 | tcp | |
| ES | 85.219.48.223:6969 | tcp |
Files
memory/1640-0-0x0000000000BE0000-0x0000000000F46000-memory.dmp
memory/1640-1-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp
memory/1640-2-0x000000001B210000-0x000000001B290000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | a585d666df5ca83eabcd06a4f0364523 |
| SHA1 | 4f5d8d09aaaf33efda276c3f7ab9883eda146da6 |
| SHA256 | 788c859458ab91850978e27a2591b564e5e3200eede844362bf465944db9d92c |
| SHA512 | 4cd1aa6c0c15264cf00feed59552e6bd1ce663af54d5fe27ac193d8af77abd23522938166ec0318482dbee6c78a6cc97f1e75a1ea148390da7c2aee6a3bca544 |
memory/1640-10-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp
memory/2988-8-0x0000000001270000-0x00000000015D6000-memory.dmp
memory/2988-11-0x000000001B440000-0x000000001B4C0000-memory.dmp
memory/2988-9-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp
memory/2988-12-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-04-15 03:28
Reported
2024-04-15 03:31
Platform
win10v2004-20240412-en
Max time kernel
149s
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 |
Detects Windows executables referencing non-Windows User-Agents
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Detects executables containing common artifacts observed in infostealers
| 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 |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-355664440-2199602304-1223909400-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\:) = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-355664440-2199602304-1223909400-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\:) = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" | C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.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\HEUR-Trojan.MSIL.Quasar.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 WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2040 wrote to memory of 4780 | N/A | C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2040 wrote to memory of 4780 | N/A | C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2040 wrote to memory of 2796 | N/A | C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 2040 wrote to memory of 2796 | N/A | C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 2796 wrote to memory of 4196 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2796 wrote to memory of 4196 | 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\HEUR-Trojan.MSIL.Quasar.exe
"C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn ":)" /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 ":)" /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 | 2.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 9.228.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 0.205.248.87.in-addr.arpa | udp |
| ES | 85.219.48.223:6969 | tcp | |
| US | 8.8.8.8:53 | 21.114.53.23.in-addr.arpa | udp |
| ES | 85.219.48.223:6969 | tcp | |
| US | 8.8.8.8:53 | 50.23.12.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 56.126.166.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| ES | 85.219.48.223:6969 | tcp | |
| ES | 85.219.48.223:6969 | tcp | |
| US | 8.8.8.8:53 | 43.229.111.52.in-addr.arpa | udp |
| ES | 85.219.48.223:6969 | tcp | |
| ES | 85.219.48.223:6969 | tcp | |
| US | 8.8.8.8:53 | 23.173.189.20.in-addr.arpa | udp |
| ES | 85.219.48.223:6969 | tcp |
Files
memory/2040-0-0x0000000000FA0000-0x0000000001306000-memory.dmp
memory/2040-1-0x00007FFFA1720000-0x00007FFFA21E1000-memory.dmp
memory/2040-2-0x000000001C1C0000-0x000000001C1D0000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | a585d666df5ca83eabcd06a4f0364523 |
| SHA1 | 4f5d8d09aaaf33efda276c3f7ab9883eda146da6 |
| SHA256 | 788c859458ab91850978e27a2591b564e5e3200eede844362bf465944db9d92c |
| SHA512 | 4cd1aa6c0c15264cf00feed59552e6bd1ce663af54d5fe27ac193d8af77abd23522938166ec0318482dbee6c78a6cc97f1e75a1ea148390da7c2aee6a3bca544 |
memory/2040-10-0x00007FFFA1720000-0x00007FFFA21E1000-memory.dmp
memory/2796-9-0x00007FFFA1720000-0x00007FFFA21E1000-memory.dmp
memory/2796-11-0x0000000002D50000-0x0000000002D60000-memory.dmp
memory/2796-12-0x000000001B760000-0x000000001B7B0000-memory.dmp
memory/2796-13-0x000000001BFB0000-0x000000001C062000-memory.dmp
memory/2796-14-0x00007FFFA1720000-0x00007FFFA21E1000-memory.dmp
memory/2796-15-0x0000000002D50000-0x0000000002D60000-memory.dmp