Analysis Overview
SHA256
1db7148b47d7219aa4587138b491a4b4bb41c7d95bfc0bdd152fdd6f1d774edb
Threat Level: Known bad
The file Client-built.exe was found to be: Known bad.
Malicious Activity Summary
Quasar RAT
Quasar family
Quasar payload
Executes dropped EXE
Unsigned PE
Creates scheduled task(s)
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Suspicious use of SetWindowsHookEx
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-04-22 06:09
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
2024-04-22 06:09
Reported
2024-04-22 06:12
Platform
win10v2004-20240412-en
Max time kernel
150s
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 5020 wrote to memory of 2932 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 5020 wrote to memory of 2932 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 5020 wrote to memory of 560 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 5020 wrote to memory of 560 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 560 wrote to memory of 3844 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 560 wrote to memory of 3844 | 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
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 | 69.31.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 13.86.106.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.197.17.2.in-addr.arpa | udp |
| N/A | 192.168.40.129:4782 | tcp | |
| US | 8.8.8.8:53 | 241.154.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 67.32.209.4.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 | 21.114.53.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 237.197.79.204.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 55.36.223.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 183.142.211.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 209.205.72.20.in-addr.arpa | udp |
| N/A | 192.168.40.129:4782 | tcp | |
| US | 8.8.8.8:53 | 157.123.68.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 56.126.166.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 65.139.73.23.in-addr.arpa | udp |
| N/A | 192.168.40.129:4782 | tcp | |
| US | 8.8.8.8:53 | 14.251.17.2.in-addr.arpa | udp |
| N/A | 192.168.40.129:4782 | tcp | |
| US | 8.8.8.8:53 | 249.197.17.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 31.243.111.52.in-addr.arpa | udp |
| N/A | 192.168.40.129:4782 | tcp | |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| N/A | 192.168.40.129:4782 | tcp | |
| N/A | 192.168.40.129:4782 | tcp |
Files
memory/5020-0-0x0000000000B60000-0x0000000000E84000-memory.dmp
memory/5020-1-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp
memory/5020-2-0x000000001BC30000-0x000000001BC40000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 41de983b173011ea0f81bc18257927ea |
| SHA1 | 48b40eadc6eca603b8adc15bc38a0b5b9450e56a |
| SHA256 | 1db7148b47d7219aa4587138b491a4b4bb41c7d95bfc0bdd152fdd6f1d774edb |
| SHA512 | 4efe78911125a02dea2a1e5112ae5869773b95862a104c9a97b4953a9a723898a56638f25cbb8508219896ffee9d5ae5d15d9dd1eb8790c2f28bfea1209a3525 |
memory/560-9-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp
memory/5020-10-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp
memory/560-11-0x0000000001010000-0x0000000001020000-memory.dmp
memory/560-12-0x000000001B580000-0x000000001B5D0000-memory.dmp
memory/560-13-0x000000001BCB0000-0x000000001BD62000-memory.dmp
memory/560-14-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp
memory/560-15-0x0000000001010000-0x0000000001020000-memory.dmp