Analysis Overview
SHA256
27f1a7bab299f2c36793116723e05be58c6edff36c07ba24a2703903cbdd6048
Threat Level: Known bad
The file qqsarbuilder.exe was found to be: Known bad.
Malicious Activity Summary
Quasar family
Quasar RAT
Quasar payload
Executes dropped EXE
Unsigned PE
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Scheduled Task/Job: Scheduled Task
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-08-04 12:00
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
2024-08-04 12:00
Reported
2024-08-04 12:01
Platform
win7-20240704-en
Max time kernel
4s
Max time network
8s
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\windwsupdater.exe | N/A |
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\qqsarbuilder.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe | N/A |
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.exe
"C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "windwsupdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe" /rl HIGHEST /f
C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe
"C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "windwsupdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| N/A | 192.168.174.129:4782 | tcp |
Files
memory/2708-0-0x000007FEF53D3000-0x000007FEF53D4000-memory.dmp
memory/2708-1-0x0000000000FD0000-0x00000000012F4000-memory.dmp
memory/2708-2-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe
| MD5 | ea1ab6ce5932a3718821475f19feefea |
| SHA1 | 5ab97ce62532976abd93ed2cf56662b8ec15606c |
| SHA256 | 27f1a7bab299f2c36793116723e05be58c6edff36c07ba24a2703903cbdd6048 |
| SHA512 | e66fa91097b2f725503206bd7e92da486ffd17a9c8fab221387c1d3795e59afedae4fb791b9c530e2e25272a642964e63dc15fe081faed29289c332db8523838 |
memory/2880-8-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp
memory/2708-10-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp
memory/2880-9-0x0000000000FC0000-0x00000000012E4000-memory.dmp
memory/2880-11-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-08-04 12:00
Reported
2024-08-04 12:03
Platform
win10v2004-20240802-en
Max time kernel
126s
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\windwsupdater.exe | N/A |
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\qqsarbuilder.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 3196 wrote to memory of 4988 | N/A | C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3196 wrote to memory of 4988 | N/A | C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3196 wrote to memory of 2796 | N/A | C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.exe | C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe |
| PID 3196 wrote to memory of 2796 | N/A | C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.exe | C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe |
| PID 2796 wrote to memory of 2808 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2796 wrote to memory of 2808 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.exe
"C:\Users\Admin\AppData\Local\Temp\qqsarbuilder.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "windwsupdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe" /rl HIGHEST /f
C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe
"C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "windwsupdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 67.31.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.210.232.199.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 43.58.199.20.in-addr.arpa | udp |
| N/A | 192.168.174.129:4782 | tcp | |
| N/A | 192.168.174.129:4782 | tcp | |
| US | 8.8.8.8:53 | 157.123.68.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 18.31.95.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 217.135.221.88.in-addr.arpa | udp |
| N/A | 192.168.174.129:4782 | tcp | |
| US | 8.8.8.8:53 | 73.144.22.2.in-addr.arpa | udp |
| N/A | 192.168.174.129:4782 | tcp | |
| US | 8.8.8.8:53 | 43.229.111.52.in-addr.arpa | udp |
| N/A | 192.168.174.129:4782 | tcp | |
| N/A | 192.168.174.129:4782 | tcp |
Files
memory/3196-0-0x00007FFA3F993000-0x00007FFA3F995000-memory.dmp
memory/3196-1-0x00000000006C0000-0x00000000009E4000-memory.dmp
memory/3196-2-0x00007FFA3F990000-0x00007FFA40451000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\windwsupdater.exe
| MD5 | ea1ab6ce5932a3718821475f19feefea |
| SHA1 | 5ab97ce62532976abd93ed2cf56662b8ec15606c |
| SHA256 | 27f1a7bab299f2c36793116723e05be58c6edff36c07ba24a2703903cbdd6048 |
| SHA512 | e66fa91097b2f725503206bd7e92da486ffd17a9c8fab221387c1d3795e59afedae4fb791b9c530e2e25272a642964e63dc15fe081faed29289c332db8523838 |
memory/3196-9-0x00007FFA3F990000-0x00007FFA40451000-memory.dmp
memory/2796-10-0x00007FFA3F990000-0x00007FFA40451000-memory.dmp
memory/2796-11-0x00007FFA3F990000-0x00007FFA40451000-memory.dmp
memory/2796-12-0x000000001BD00000-0x000000001BD50000-memory.dmp
memory/2796-13-0x000000001C5A0000-0x000000001C652000-memory.dmp
memory/2796-14-0x00007FFA3F990000-0x00007FFA40451000-memory.dmp