Analysis Overview
SHA256
fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
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
Loads dropped DLL
Looks up external IP address via web service
Unsigned PE
Suspicious use of SetWindowsHookEx
Creates scheduled task(s)
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2023-11-28 12:41
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
2023-11-28 12:40
Reported
2023-11-28 12:43
Platform
win7-20231020-en
Max time kernel
118s
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 |
| 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 |
Loads dropped DLL
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
Looks up external IP address via web service
| Description | Indicator | Process | Target |
| N/A | ip-api.com | N/A | N/A |
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\schtasks.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\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
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /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 | ip-api.com | udp |
| US | 208.95.112.1:80 | ip-api.com | tcp |
| US | 208.95.112.1:80 | ip-api.com | tcp |
| VN | 223.27.104.5:4782 | tcp |
Files
memory/2256-0-0x0000000001170000-0x00000000011CE000-memory.dmp
memory/2256-1-0x0000000074400000-0x0000000074AEE000-memory.dmp
memory/2256-2-0x00000000049D0000-0x0000000004A10000-memory.dmp
\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 2207ba09525cf5c4b7b7e09359bd6118 |
| SHA1 | 2c266c94899b4cb038e812ed1c067b47979399bd |
| SHA256 | fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed |
| SHA512 | 628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb |
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 2207ba09525cf5c4b7b7e09359bd6118 |
| SHA1 | 2c266c94899b4cb038e812ed1c067b47979399bd |
| SHA256 | fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed |
| SHA512 | 628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb |
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 2207ba09525cf5c4b7b7e09359bd6118 |
| SHA1 | 2c266c94899b4cb038e812ed1c067b47979399bd |
| SHA256 | fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed |
| SHA512 | 628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb |
memory/2256-9-0x0000000074400000-0x0000000074AEE000-memory.dmp
memory/2740-11-0x0000000001270000-0x00000000012CE000-memory.dmp
memory/2740-10-0x0000000074400000-0x0000000074AEE000-memory.dmp
memory/2740-12-0x0000000001210000-0x0000000001250000-memory.dmp
memory/2740-14-0x0000000074400000-0x0000000074AEE000-memory.dmp
memory/2740-15-0x0000000001210000-0x0000000001250000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2023-11-28 12:40
Reported
2023-11-28 12:43
Platform
win10v2004-20231127-en
Max time kernel
143s
Max time network
148s
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\Client.exe | N/A |
Looks up external IP address via web service
| Description | Indicator | Process | Target |
| N/A | ip-api.com | N/A | N/A |
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\schtasks.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\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
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /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 | 39.142.81.104.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 68.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 241.154.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 43.58.199.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | ip-api.com | udp |
| US | 208.95.112.1:80 | ip-api.com | tcp |
| US | 8.8.8.8:53 | 1.112.95.208.in-addr.arpa | udp |
| US | 208.95.112.1:80 | ip-api.com | tcp |
| VN | 223.27.104.5:4782 | tcp | |
| US | 8.8.8.8:53 | 5.104.27.223.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 183.59.114.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 206.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 1.202.248.87.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 31.243.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 23.173.189.20.in-addr.arpa | udp |
Files
memory/856-0-0x0000000000EB0000-0x0000000000F0E000-memory.dmp
memory/856-1-0x00000000745C0000-0x0000000074D70000-memory.dmp
memory/856-2-0x0000000005EF0000-0x0000000006494000-memory.dmp
memory/856-3-0x00000000059E0000-0x0000000005A72000-memory.dmp
memory/856-4-0x00000000058D0000-0x00000000058E0000-memory.dmp
memory/856-5-0x0000000005B80000-0x0000000005BE6000-memory.dmp
memory/856-6-0x0000000006720000-0x0000000006732000-memory.dmp
memory/856-7-0x0000000006B60000-0x0000000006B9C000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 2207ba09525cf5c4b7b7e09359bd6118 |
| SHA1 | 2c266c94899b4cb038e812ed1c067b47979399bd |
| SHA256 | fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed |
| SHA512 | 628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb |
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 2207ba09525cf5c4b7b7e09359bd6118 |
| SHA1 | 2c266c94899b4cb038e812ed1c067b47979399bd |
| SHA256 | fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed |
| SHA512 | 628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb |
memory/404-13-0x00000000745C0000-0x0000000074D70000-memory.dmp
memory/856-14-0x00000000745C0000-0x0000000074D70000-memory.dmp
memory/404-15-0x0000000004F50000-0x0000000004F60000-memory.dmp
memory/404-17-0x0000000006700000-0x000000000670A000-memory.dmp
memory/404-18-0x00000000745C0000-0x0000000074D70000-memory.dmp
memory/404-19-0x0000000004F50000-0x0000000004F60000-memory.dmp