Analysis Overview
SHA256
96e859dad002f1e69e810c5f6ac60926f71a5ec03b4a7bde6cb9935f2927fbc3
Threat Level: Known bad
The file MainBuild.exe was found to be: Known bad.
Malicious Activity Summary
Quasar RAT
Quasar family
Quasar payload
Executes dropped EXE
Unsigned PE
Suspicious use of FindShellTrayWindow
Suspicious behavior: EnumeratesProcesses
Modifies registry class
Checks SCSI registry key(s)
Suspicious use of SetWindowsHookEx
Suspicious use of AdjustPrivilegeToken
Creates scheduled task(s)
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Suspicious behavior: GetForegroundWindowSpam
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-04-17 21:11
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
2024-04-17 21:11
Reported
2024-04-17 23:07
Platform
win10v2004-20240412-en
Max time kernel
149s
Max time network
150s
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 |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Checks SCSI registry key(s)
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000 | C:\Windows\system32\taskmgr.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\Properties\{b725f130-47ef-101a-a5f1-02608c9eebac}\000A | C:\Windows\system32\taskmgr.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\FriendlyName | C:\Windows\system32\taskmgr.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 |
Modifies registry class
| Description | Indicator | Process | Target |
| Set value (data) | \REGISTRY\USER\S-1-5-21-355664440-2199602304-1223909400-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff | C:\Windows\system32\taskmgr.exe | N/A |
| Key created | \REGISTRY\USER\S-1-5-21-355664440-2199602304-1223909400-1000_Classes\Local Settings | C:\Windows\system32\taskmgr.exe | N/A |
| Key created | \REGISTRY\USER\S-1-5-21-355664440-2199602304-1223909400-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell | C:\Windows\system32\taskmgr.exe | N/A |
| Key created | \REGISTRY\USER\S-1-5-21-355664440-2199602304-1223909400-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU | C:\Windows\system32\taskmgr.exe | N/A |
| Set value (data) | \REGISTRY\USER\S-1-5-21-355664440-2199602304-1223909400-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots | C:\Windows\system32\taskmgr.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\taskmgr.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\MainBuild.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\taskmgr.exe | N/A |
| Token: SeSystemProfilePrivilege | N/A | C:\Windows\system32\taskmgr.exe | N/A |
| Token: SeCreateGlobalPrivilege | N/A | C:\Windows\system32\taskmgr.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
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 3156 wrote to memory of 4700 | N/A | C:\Users\Admin\AppData\Local\Temp\MainBuild.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3156 wrote to memory of 4700 | N/A | C:\Users\Admin\AppData\Local\Temp\MainBuild.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3156 wrote to memory of 2848 | N/A | C:\Users\Admin\AppData\Local\Temp\MainBuild.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 3156 wrote to memory of 2848 | N/A | C:\Users\Admin\AppData\Local\Temp\MainBuild.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 2848 wrote to memory of 944 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2848 wrote to memory of 944 | 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\MainBuild.exe
"C:\Users\Admin\AppData\Local\Temp\MainBuild.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "System 32" /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 "System 32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
C:\Windows\system32\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /7
C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 8.8.8.8.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 75.159.190.20.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 | 172.210.232.199.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 9.228.82.20.in-addr.arpa | udp |
| N/A | 192.168.56.1:4782 | tcp | |
| US | 8.8.8.8:53 | 237.197.79.204.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 198.32.209.4.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 132.250.30.184.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| N/A | 192.168.56.1:4782 | tcp | |
| US | 8.8.8.8:53 | 50.23.12.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 171.39.242.20.in-addr.arpa | udp |
| N/A | 192.168.56.1:4782 | tcp | |
| US | 8.8.8.8:53 | 25.24.18.2.in-addr.arpa | udp |
| N/A | 192.168.56.1:4782 | tcp | |
| US | 8.8.8.8:53 | 43.229.111.52.in-addr.arpa | udp |
| N/A | 192.168.56.1:4782 | tcp | |
| N/A | 192.168.56.1:4782 | tcp | |
| N/A | 192.168.56.1:4782 | tcp |
Files
memory/3156-0-0x00000000006B0000-0x00000000009D4000-memory.dmp
memory/3156-1-0x00007FFD41C20000-0x00007FFD426E1000-memory.dmp
memory/3156-2-0x000000001B5B0000-0x000000001B5C0000-memory.dmp
memory/3156-9-0x00007FFD41C20000-0x00007FFD426E1000-memory.dmp
memory/2848-10-0x00007FFD41C20000-0x00007FFD426E1000-memory.dmp
memory/2848-11-0x000000001B760000-0x000000001B770000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 3bbe6fc1601a30703de700e53c6f072f |
| SHA1 | e59be8b17dde867d5dd52d563f6c115149f4473a |
| SHA256 | 96e859dad002f1e69e810c5f6ac60926f71a5ec03b4a7bde6cb9935f2927fbc3 |
| SHA512 | 197a18f9d5d01cee50c160450b23e60b3a770e4140462b032efe44cfd9e9b2a6fa513ada7bef341624e20fd6760ca1e492de4fd2b359da660735dafc518c3ce0 |
memory/2848-12-0x000000001B6F0000-0x000000001B740000-memory.dmp
memory/2848-13-0x000000001C090000-0x000000001C142000-memory.dmp
memory/2848-14-0x00007FFD41C20000-0x00007FFD426E1000-memory.dmp
memory/2848-15-0x000000001B760000-0x000000001B770000-memory.dmp
memory/2848-16-0x000000001C9C0000-0x000000001CEE8000-memory.dmp
memory/4904-18-0x0000019A87830000-0x0000019A87831000-memory.dmp
memory/4904-19-0x0000019A87830000-0x0000019A87831000-memory.dmp
memory/4904-20-0x0000019A87830000-0x0000019A87831000-memory.dmp
memory/4904-24-0x0000019A87830000-0x0000019A87831000-memory.dmp
memory/4904-25-0x0000019A87830000-0x0000019A87831000-memory.dmp
memory/4904-28-0x0000019A87830000-0x0000019A87831000-memory.dmp
memory/4904-29-0x0000019A87830000-0x0000019A87831000-memory.dmp
memory/4904-27-0x0000019A87830000-0x0000019A87831000-memory.dmp
memory/4904-26-0x0000019A87830000-0x0000019A87831000-memory.dmp
memory/4904-30-0x0000019A87830000-0x0000019A87831000-memory.dmp
memory/4608-34-0x00007FFD41C20000-0x00007FFD426E1000-memory.dmp
memory/4608-35-0x000000001B2C0000-0x000000001B2D0000-memory.dmp
memory/4608-37-0x00007FFD41C20000-0x00007FFD426E1000-memory.dmp