Analysis Overview
SHA256
fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4
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
Unsigned PE
Enumerates physical storage devices
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Modifies registry class
Scheduled Task/Job: Scheduled Task
Suspicious use of SendNotifyMessage
Suspicious use of FindShellTrayWindow
Checks SCSI registry key(s)
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-10-31 00:30
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
2024-10-31 00:30
Reported
2024-10-31 00:33
Platform
win10ltsc2021-20241023-en
Max time kernel
134s
Max time network
150s
Command Line
Signatures
Quasar RAT
Quasar family
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\Desktop\Client.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
| N/A | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
| N/A | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
| N/A | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
| N/A | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
| N/A | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
| N/A | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
Enumerates physical storage devices
Checks SCSI registry key(s)
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000 | C:\Windows\system32\taskmgr.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\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_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\FriendlyName | C:\Windows\system32\taskmgr.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-1361837696-2276465416-1936241636-1000_Classes\Local Settings | C:\Windows\system32\taskmgr.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 |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
Suspicious behavior: EnumeratesProcesses
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 |
| 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: 33 | N/A | C:\Windows\system32\taskmgr.exe | N/A |
| Token: SeIncBasePriorityPrivilege | N/A | C:\Windows\system32\taskmgr.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\Desktop\Client.exe | N/A |
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
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 "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\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /0
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\Desktop\Client.exe
"C:\Users\Admin\Desktop\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:\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:\Users\Admin\Desktop\Client.exe
"C:\Users\Admin\Desktop\Client.exe"
C:\Users\Admin\Desktop\Client.exe
"C:\Users\Admin\Desktop\Client.exe"
C:\Users\Admin\Desktop\Client.exe
"C:\Users\Admin\Desktop\Client.exe"
C:\Users\Admin\Desktop\Client.exe
"C:\Users\Admin\Desktop\Client.exe"
C:\Users\Admin\Desktop\Client.exe
"C:\Users\Admin\Desktop\Client.exe"
C:\Users\Admin\Desktop\Client.exe
"C:\Users\Admin\Desktop\Client.exe"
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 | 210.108.222.173.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 133.32.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| N/A | 10.127.1.2:1604 | tcp | |
| N/A | 10.127.1.2:1604 | tcp | |
| US | 8.8.8.8:53 | 200.163.202.172.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 15.164.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | checkappexec.microsoft.com | udp |
| GB | 13.87.96.169:443 | checkappexec.microsoft.com | tcp |
| US | 8.8.8.8:53 | 169.96.87.13.in-addr.arpa | udp |
| N/A | 10.127.1.2:1604 | tcp | |
| US | 8.8.8.8:53 | 172.214.232.199.in-addr.arpa | udp |
| N/A | 10.127.1.2:1604 | tcp | |
| N/A | 10.127.1.2:1604 | tcp | |
| N/A | 10.127.1.2:1604 | tcp |
Files
memory/4800-0-0x00007FFF26413000-0x00007FFF26415000-memory.dmp
memory/4800-1-0x0000000000860000-0x0000000000B84000-memory.dmp
memory/4800-2-0x00007FFF26410000-0x00007FFF26ED2000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | dca77ba52c9e20bdb3fcb81657918f89 |
| SHA1 | 7cec39d83783008bb9a151b2a71dbc1eb03a7bbf |
| SHA256 | fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4 |
| SHA512 | 30fe235a26fe74a1fe27caafe059ee5463790252b046a5e467a0d938f1b77a05c0850a37883066a0d4c7bbd11f1bf36bf7a35e4ef3da86d4f7b2c240f2d8929a |
memory/4800-6-0x00007FFF26410000-0x00007FFF26ED2000-memory.dmp
memory/4196-5-0x00007FFF26410000-0x00007FFF26ED2000-memory.dmp
memory/4196-7-0x00007FFF26410000-0x00007FFF26ED2000-memory.dmp
memory/4196-8-0x000000001C720000-0x000000001C770000-memory.dmp
memory/4196-9-0x000000001C830000-0x000000001C8E2000-memory.dmp
memory/4196-10-0x00007FFF26410000-0x00007FFF26ED2000-memory.dmp
memory/4996-12-0x0000012F4C720000-0x0000012F4C721000-memory.dmp
memory/4996-13-0x0000012F4C720000-0x0000012F4C721000-memory.dmp
memory/4996-11-0x0000012F4C720000-0x0000012F4C721000-memory.dmp
memory/4996-21-0x0000012F4C720000-0x0000012F4C721000-memory.dmp
memory/4996-23-0x0000012F4C720000-0x0000012F4C721000-memory.dmp
memory/4996-22-0x0000012F4C720000-0x0000012F4C721000-memory.dmp
memory/4996-20-0x0000012F4C720000-0x0000012F4C721000-memory.dmp
memory/4996-19-0x0000012F4C720000-0x0000012F4C721000-memory.dmp
memory/4996-18-0x0000012F4C720000-0x0000012F4C721000-memory.dmp
memory/4996-17-0x0000012F4C720000-0x0000012F4C721000-memory.dmp
memory/4196-24-0x00007FFF26410000-0x00007FFF26ED2000-memory.dmp
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log
| MD5 | b08c36ce99a5ed11891ef6fc6d8647e9 |
| SHA1 | db95af417857221948eb1882e60f98ab2914bf1d |
| SHA256 | cc9248a177495f45ec70b86c34fc5746c56730af36ace98ac7eb365dbafda674 |
| SHA512 | 07e62581eace395b0a9699d727761648103180c21155d84ea09140f9e1c9690705c419118545aa67a564334bbde32710225fe3aa92b0b4b4210cb91f0058b1ea |