Analysis Overview
SHA256
f3de21ec995555ab187ce0a254d2b353c1ed3c06030678f898ec56efabbae51f
Threat Level: Known bad
The file Client-built.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
Scheduled Task/Job: Scheduled Task
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Suspicious use of SetWindowsHookEx
Uses Task Scheduler COM API
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-08-18 22:16
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
2024-08-18 22:16
Reported
2024-08-18 22:19
Platform
win7-20240704-en
Max time kernel
126s
Max time network
139s
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:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows | C:\Windows\system32\Windows\Windows Host Process.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\Client-built.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of WriteProcessMemory
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 "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
C:\Windows\system32\Windows\Windows Host Process.exe
"C:\Windows\system32\Windows\Windows Host Process.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp |
Files
memory/2564-0-0x000007FEF5013000-0x000007FEF5014000-memory.dmp
memory/2564-1-0x0000000000280000-0x00000000005E0000-memory.dmp
memory/2564-2-0x000007FEF5010000-0x000007FEF59FC000-memory.dmp
C:\Windows\System32\Windows\Windows Host Process.exe
| MD5 | ad8250eea17d8d7db7c3c23aba289f5c |
| SHA1 | c63d1c6b6e8b7789a777b1ffe55f15bbbfc3cc59 |
| SHA256 | f3de21ec995555ab187ce0a254d2b353c1ed3c06030678f898ec56efabbae51f |
| SHA512 | d34b9db43bd08dea4452925c7c1cf4014d03b024a663b5ee938a4f205b3c6c49eccd169cbc687145d54223d07aafcde75ee0807963e705c9c71e130c00086abd |
memory/2920-8-0x000007FEF5010000-0x000007FEF59FC000-memory.dmp
memory/2920-10-0x0000000000850000-0x0000000000BB0000-memory.dmp
memory/2564-9-0x000007FEF5010000-0x000007FEF59FC000-memory.dmp
memory/2920-11-0x000007FEF5010000-0x000007FEF59FC000-memory.dmp
memory/2920-12-0x000007FEF5010000-0x000007FEF59FC000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-08-18 22:16
Reported
2024-08-18 22:29
Platform
win10v2004-20240802-en
Max time kernel
788s
Max time network
805s
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\Windows\Windows Host Process.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system32\Windows | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| File created | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.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\Client-built.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 3424 wrote to memory of 2812 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3424 wrote to memory of 2812 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3424 wrote to memory of 2140 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\Windows\Windows Host Process.exe |
| PID 3424 wrote to memory of 2140 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\Windows\Windows Host Process.exe |
| PID 2140 wrote to memory of 4884 | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2140 wrote to memory of 4884 | N/A | C:\Windows\system32\Windows\Windows Host Process.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 "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
C:\Windows\system32\Windows\Windows Host Process.exe
"C:\Windows\system32\Windows\Windows Host Process.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 13.86.106.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 134.32.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 147.185.221.22:10340 | tcp | |
| US | 8.8.8.8:53 | 26.35.223.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 133.211.185.52.in-addr.arpa | udp |
| US | 147.185.221.22:10340 | tcp | |
| US | 8.8.8.8:53 | 86.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 15.164.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 157.123.68.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.210.232.199.in-addr.arpa | udp |
| US | 147.185.221.22:10340 | tcp | |
| US | 8.8.8.8:53 | 88.156.103.20.in-addr.arpa | udp |
| US | 147.185.221.22:10340 | tcp | |
| US | 8.8.8.8:53 | 11.227.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 150.171.28.10:443 | tse1.mm.bing.net | tcp |
| US | 147.185.221.22:10340 | tcp | |
| US | 8.8.8.8:53 | 10.28.171.150.in-addr.arpa | udp |
| US | 147.185.221.22:10340 | tcp | |
| US | 8.8.8.8:53 | 48.192.11.51.in-addr.arpa | udp |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp |
Files
memory/3424-0-0x00007FFE509A3000-0x00007FFE509A5000-memory.dmp
memory/3424-1-0x0000000000E70000-0x00000000011D0000-memory.dmp
memory/3424-2-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp
C:\Windows\System32\Windows\Windows Host Process.exe
| MD5 | ad8250eea17d8d7db7c3c23aba289f5c |
| SHA1 | c63d1c6b6e8b7789a777b1ffe55f15bbbfc3cc59 |
| SHA256 | f3de21ec995555ab187ce0a254d2b353c1ed3c06030678f898ec56efabbae51f |
| SHA512 | d34b9db43bd08dea4452925c7c1cf4014d03b024a663b5ee938a4f205b3c6c49eccd169cbc687145d54223d07aafcde75ee0807963e705c9c71e130c00086abd |
memory/3424-9-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp
memory/2140-10-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp
memory/2140-11-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp
memory/2140-12-0x000000001C470000-0x000000001C4C0000-memory.dmp
memory/2140-13-0x000000001C580000-0x000000001C632000-memory.dmp
memory/2140-14-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp