Analysis
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max time kernel
1383s -
max time network
1172s -
platform
windows11-21h2_x64 -
resource
win11-20240508-en -
resource tags
arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system -
submitted
25-05-2024 01:25
General
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Target
client.exe
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Size
3.1MB
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MD5
4dfff8420e0d2f3a0e30a3ae8e005830
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SHA1
379546834fa347bdcf6a4aa1a9d956b540d33b55
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SHA256
7869d203ee2ffc4d75d4d542cc2e3a970ca249d675e8bc7bd4f9cc85c80cab69
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SHA512
6f4de859019a9ed236f6ddcbb03737c9e643368ae74fea3b36f7254a1b691448fb5f5befe4997554ed96f099309908f6b0a42d46161d3727d07620b1ecca94cb
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SSDEEP
49152:2vBt62XlaSFNWPjljiFa2RoUYIlQcMbKLoGdFewTHHB72eh2NT:2vr62XlaSFNWPjljiFXRoUYIlQcM2
Malware Config
Extracted
quasar
1.4.1
watchdog
142.115.43.39:8080
1c1f3ace-a14c-4361-99eb-65aedb6d50fd
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encryption_key
3FAEE4D5FC9BC245D4CA5F4165EAFD34E8D5FE16
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install_name
watchdog.exe
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log_directory
logs
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reconnect_delay
3000
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startup_key
watchdog
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subdirectory
drivers
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral1/memory/4380-1-0x0000000000D20000-0x0000000001044000-memory.dmp family_quasar C:\Windows\System32\drivers\watchdog.exe family_quasar -
Drops file in Drivers directory 3 IoCs
Processes:
client.exewatchdog.exedescription ioc process File created C:\Windows\system32\drivers\watchdog.exe client.exe File opened for modification C:\Windows\system32\drivers\watchdog.exe client.exe File opened for modification C:\Windows\system32\drivers\watchdog.exe watchdog.exe -
Executes dropped EXE 1 IoCs
Processes:
watchdog.exepid process 4524 watchdog.exe -
Drops file in System32 directory 21 IoCs
Processes:
svchost.execlient.exewatchdog.exedescription ioc process File opened for modification C:\Windows\System32\Winevt\Logs\Application.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Microsoft-Windows-Sysmon%4Operational.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Security.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\OAlerts.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Microsoft-Windows-GroupPolicy%4Operational.evtx svchost.exe File opened for modification C:\Windows\system32\drivers client.exe File opened for modification C:\Windows\System32\Winevt\Logs\System.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Microsoft-Windows-WinINet-Config%4ProxyConfigChanged.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Internet Explorer.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Key Management Service.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Microsoft-Windows-LiveId%4Operational.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Microsoft-Windows-Kernel-Cache%4Operational.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Microsoft-Windows-CloudStore%4Operational.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\HardwareEvents.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Microsoft-Windows-HotspotAuth%4Operational.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Microsoft-Windows-AppModel-Runtime%4Admin.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Microsoft-Windows-NCSI%4Operational.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Windows PowerShell.evtx svchost.exe File opened for modification C:\Windows\System32\Winevt\Logs\Microsoft-Windows-Storage-Storport%4Health.evtx svchost.exe File opened for modification C:\Windows\system32\drivers watchdog.exe File opened for modification C:\Windows\System32\Winevt\Logs\Microsoft-Windows-Storage-Storport%4Operational.evtx svchost.exe -
Drops file in Windows directory 2 IoCs
Processes:
svchost.exedescription ioc process File opened for modification C:\Windows\ServiceState\EventLog\Data\lastalive0.dat svchost.exe File opened for modification C:\Windows\ServiceState\EventLog\Data\lastalive1.dat svchost.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
svchost.exedescription ioc process Key opened \Registry\Machine\HARDWARE\DESCRIPTION\System\CentralProcessor\0 svchost.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz svchost.exe -
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 2616 schtasks.exe 1392 schtasks.exe -
Runs ping.exe 1 TTPs 1 IoCs
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Suspicious behavior: EnumeratesProcesses 5 IoCs
Processes:
watchdog.exepid process 4524 watchdog.exe 4524 watchdog.exe 4524 watchdog.exe 4524 watchdog.exe 4524 watchdog.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
client.exewatchdog.exedescription pid process Token: SeDebugPrivilege 4380 client.exe Token: SeDebugPrivilege 4524 watchdog.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
watchdog.exepid process 4524 watchdog.exe -
Suspicious use of WriteProcessMemory 14 IoCs
Processes:
client.exewatchdog.execmd.exedescription pid process target process PID 4380 wrote to memory of 1392 4380 client.exe schtasks.exe PID 4380 wrote to memory of 1392 4380 client.exe schtasks.exe PID 4380 wrote to memory of 4524 4380 client.exe watchdog.exe PID 4380 wrote to memory of 4524 4380 client.exe watchdog.exe PID 4524 wrote to memory of 2616 4524 watchdog.exe schtasks.exe PID 4524 wrote to memory of 2616 4524 watchdog.exe schtasks.exe PID 4524 wrote to memory of 2464 4524 watchdog.exe schtasks.exe PID 4524 wrote to memory of 2464 4524 watchdog.exe schtasks.exe PID 4524 wrote to memory of 2992 4524 watchdog.exe cmd.exe PID 4524 wrote to memory of 2992 4524 watchdog.exe cmd.exe PID 2992 wrote to memory of 3044 2992 cmd.exe chcp.com PID 2992 wrote to memory of 3044 2992 cmd.exe chcp.com PID 2992 wrote to memory of 1040 2992 cmd.exe PING.EXE PID 2992 wrote to memory of 1040 2992 cmd.exe PING.EXE -
Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\client.exe"C:\Users\Admin\AppData\Local\Temp\client.exe"1⤵
- Drops file in Drivers directory
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4380 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "watchdog" /sc ONLOGON /tr "C:\Windows\system32\drivers\watchdog.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:1392 -
C:\Windows\system32\drivers\watchdog.exe"C:\Windows\system32\drivers\watchdog.exe"2⤵
- Drops file in Drivers directory
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4524 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "watchdog" /sc ONLOGON /tr "C:\Windows\system32\drivers\watchdog.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:2616 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /delete /tn "watchdog" /f3⤵PID:2464
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\CSz9IKETpQUc.bat" "3⤵
- Suspicious use of WriteProcessMemory
PID:2992 -
C:\Windows\system32\chcp.comchcp 650014⤵PID:3044
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C:\Windows\system32\PING.EXEping -n 10 localhost4⤵
- Runs ping.exe
PID:1040
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k LocalServiceNetworkRestricted -p -s EventLog1⤵
- Drops file in System32 directory
- Drops file in Windows directory
- Checks processor information in registry
PID:1104
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k osprivacy -p -s camsvc1⤵PID:3240
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
203B
MD5786250ed1b549ef81c2ae3ec0e66e4b7
SHA19e9d5114974b5addf50b1ce29cf43f4d7dbc34c1
SHA25603b7026273b556cdddcf25c6b35a3e78a4f9c7bc654681a5a744ac3eb9165c05
SHA5128a68f0b069abe6e8deb9d2d43e7e0c864c80bacc5582a5577b2cbc42c091d90ce832fbb8ac7ae9727945888efad0ff2b8762e33b4b67103c8e3ec8ce1f9e31b8
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Filesize
3.1MB
MD54dfff8420e0d2f3a0e30a3ae8e005830
SHA1379546834fa347bdcf6a4aa1a9d956b540d33b55
SHA2567869d203ee2ffc4d75d4d542cc2e3a970ca249d675e8bc7bd4f9cc85c80cab69
SHA5126f4de859019a9ed236f6ddcbb03737c9e643368ae74fea3b36f7254a1b691448fb5f5befe4997554ed96f099309908f6b0a42d46161d3727d07620b1ecca94cb