Analysis Overview
SHA256
97cd6ad3a56efc266ba1860e2d1c5958094b988be74bd36e9499d22fdaed9c59
Threat Level: Known bad
The file Client-built.exe was found to be: Known bad.
Malicious Activity Summary
Quasar RAT
Quasar payload
Quasar family
Executes dropped EXE
Drops file in System32 directory
Unsigned PE
Creates scheduled task(s)
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-04-19 22:30
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
2024-04-19 22:30
Reported
2024-04-19 22:31
Platform
win10v2004-20240412-en
Max time kernel
63s
Max time network
70s
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\Client.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.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:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 3324 wrote to memory of 3320 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3324 wrote to memory of 3320 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3324 wrote to memory of 2912 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 3324 wrote to memory of 2912 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 2912 wrote to memory of 2124 | N/A | C:\Windows\system32\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2912 wrote to memory of 2124 | N/A | C:\Windows\system32\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 "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
C:\Windows\system32\SubDir\Client.exe
"C:\Windows\system32\SubDir\Client.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 17.160.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 183.142.211.20.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 8.8.8.8:53 | 88.156.103.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 241.154.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 198.32.209.4.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 26.165.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 21.114.53.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 18.31.95.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 209.205.72.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 154.173.246.72.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 119.110.54.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 206.221.208.4.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 8.8.8.8:53 | 172.210.232.199.in-addr.arpa | udp |
| N/A | 192.168.1.139:4782 | tcp | |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
Files
memory/3324-0-0x0000000000240000-0x0000000000564000-memory.dmp
memory/3324-1-0x00007FFAB7880000-0x00007FFAB8341000-memory.dmp
memory/3324-2-0x000000001B1B0000-0x000000001B1C0000-memory.dmp
C:\Windows\System32\SubDir\Client.exe
| MD5 | 491d53dcfb36c12d0077bbb926f24d02 |
| SHA1 | 4e35320259495d99e3d9fbc03aeea39c93c3a051 |
| SHA256 | 97cd6ad3a56efc266ba1860e2d1c5958094b988be74bd36e9499d22fdaed9c59 |
| SHA512 | 7f9a8134032cb437278422d7f0ea123e68146fc5f6f3de693592b96620669eb36696625235fddbebae0949e9ddbbd4d8f694c61f16489a38322d90149f70553b |
memory/3324-8-0x00007FFAB7880000-0x00007FFAB8341000-memory.dmp
memory/2912-9-0x00007FFAB7880000-0x00007FFAB8341000-memory.dmp
memory/2912-10-0x000000001B340000-0x000000001B350000-memory.dmp
memory/2912-11-0x000000001B140000-0x000000001B190000-memory.dmp
memory/2912-12-0x000000001BF50000-0x000000001C002000-memory.dmp
memory/2912-13-0x00007FFAB7880000-0x00007FFAB8341000-memory.dmp
memory/2912-14-0x000000001B340000-0x000000001B350000-memory.dmp