Analysis
- max time kernel
149s - max time network
148s - platform
windows11-21h2_x64 - resource
win11-20260130-en - resource tags
- submitted
07/04/2026, 15:48
General
- Target Client.exe
- Size 3.1MB
- Sample260407-s8w6taa171
- SHA256 662828108510c30f95948ede0fb88e77617f15f010aadc627156ab845776c496
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
xn--n8j214ginb1xa168mh3g.jpn.com:443
-
www.xn--n8j214ginb1xa168mh3g.jpn.com:443
-
xn--n8j214ginb1xa168mh3g.jpn.com:80
-
www.xn--n8j214ginb1xa168mh3g.jpn.com:80
-
8a255c0f-12f3-4ad5-bf77-6918485a30ce
-
encryption_key
ED3227F773701D05083B11A65776F95F93EEEF5E
-
install_name
Client.exe
-
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar family
- Quasar payload 2 IoCs
- Executes dropped EXE 2 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 3 IoCs
- 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
-
C:\Users\Admin\AppData\Local\Temp\Client.exe"C:\Users\Admin\AppData\Local\Temp\Client.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
-
C:\Users\Admin\AppData\Roaming\SubDir\Client.exeC:\Users\Admin\AppData\Roaming\SubDir\Client.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
Loading Replay Monitor...
Downloads
Client.exe.log
Client.exe
memory/2852-17-0x000000001C200000-0x000000001C250000-memory.dmp
memory/2852-19-0x000000001AEC0000-0x000000001B05A000-memory.dmp
memory/2852-20-0x0000000000C00000-0x0000000000C0C000-memory.dmp
memory/2852-21-0x0000000000C80000-0x0000000000C92000-memory.dmp
memory/2852-22-0x0000000000CB0000-0x0000000000CC0000-memory.dmp
memory/2852-12-0x0000000000CB0000-0x0000000000CC0000-memory.dmp
memory/2852-18-0x000000001C310000-0x000000001C3C2000-memory.dmp
memory/4792-11-0x000000001C3E0000-0x000000001C3F2000-memory.dmp
memory/4792-9-0x000000001BE50000-0x000000001BFEA000-memory.dmp
memory/4792-10-0x0000000001BF0000-0x0000000001BFC000-memory.dmp
memory/4792-0-0x0000000000F90000-0x00000000012B4000-memory.dmp
memory/4792-1-0x0000000003410000-0x0000000003420000-memory.dmp
memory/4900-14-0x000000001B500000-0x000000001B69A000-memory.dmp
memory/4900-15-0x0000000002BA0000-0x0000000002BAC000-memory.dmp
memory/4900-16-0x000000001BBF0000-0x000000001BC02000-memory.dmp