Analysis
- max time kernel
899s - max time network
466s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
02/11/2026, 00:12
General
- Target Client-built.exe
- Size 3.1MB
- Sample261102-ahff9sd15x
- SHA256 89482b6f85e2e9217c13c7025057dc417c173c37f10cc17a2ac921c17ad70259
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
10.127.0.114:4782
-
9c1cdb10-f105-4592-8641-41a39eaf055c
-
encryption_key
90569FAB3EA9928EAA9FBF97BF0221521884B7B5
-
install_name
ConHostUTIL.exe
-
key_salt
bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941
-
log_directory
utilcon
-
reconnect_delay
3000
-
startup_key
conhost
-
subdirectory
conhostutil
Signatures
- Family: Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 2 IoCs
- Drops file in System32 directory 5 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-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "conhost" /sc ONLOGON /tr "C:\Windows\system32\conhostutil\ConHostUTIL.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Windows\system32\conhostutil\ConHostUTIL.exe"C:\Windows\system32\conhostutil\ConHostUTIL.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- 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 "conhost" /sc ONLOGON /tr "C:\Windows\system32\conhostutil\ConHostUTIL.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
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C:\Windows\system32\conhostutil\ConHostUTIL.exeC:\Windows\system32\conhostutil\ConHostUTIL.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k GPSvcGroup1⤵
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C:\Windows\System32\SecurityHealthHost.exe\\?\C:\Windows\System32\SecurityHealthHost.exe {08728914-3F57-4D52-9E31-49DAECA5A80A} -Embedding1⤵
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
ConHostUTIL.exe
memory/1960-25-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-18-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-33-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-32-0x000000001D2F0000-0x000000001D3A2000-memory.dmp
memory/1960-31-0x000000001D1E0000-0x000000001D230000-memory.dmp
memory/1960-29-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-28-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-27-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-17-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-26-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-24-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-22-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-21-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-20-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-19-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-15-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/1960-16-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-10-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-7-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-1-0x00000000004F0000-0x0000000000814000-memory.dmp
memory/4168-13-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-12-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-9-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-2-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-0-0x00007FFC6D1DF000-0x00007FFC6D1E0000-memory.dmp
memory/4168-11-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-8-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-23-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-6-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-5-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-4-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp
memory/4168-3-0x00007FFC6D050000-0x00007FFC6D9F4000-memory.dmp