Analysis
- max time kernel
1665s - max time network
1793s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
31/03/2024, 00:43
General
- Target Client-built.exe
- Size 3.1MB
- Sample240331-a26gssae7v
- SHA256 f2e04196e1353ad216e077e0aeb2e1ab8ee93b8b16b205422b4cc6d8adc50cc2
Malware Config
Extracted
-
quasar
-
1.4.1
-
Ratted
-
140.238.91.110:44867
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be049c71-d631-4f68-8b3e-8e01081f2340
-
encryption_key
AA883CE7347A3543F81EBCDE3BBF3BFC9C60344E
-
install_name
WOS64UPD.exe
-
log_directory
Windows Update Logs
-
reconnect_delay
3000
-
startup_key
Windows Updater
-
subdirectory
Windows
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Creates scheduled task(s) 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 SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 6 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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
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C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe"C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\WOS64UPD.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
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C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe1⤵
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k UnistackSvcGroup1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
WOS64UPD.exe
memory/532-12-0x000000001C4F0000-0x000000001C5A2000-memory.dmp
memory/532-17-0x00007FFA33460000-0x00007FFA33F21000-memory.dmp
memory/532-16-0x000000001BDD0000-0x000000001BE0C000-memory.dmp
memory/532-15-0x000000001BC70000-0x000000001BC82000-memory.dmp
memory/532-9-0x00007FFA33460000-0x00007FFA33F21000-memory.dmp
memory/532-10-0x000000001BE20000-0x000000001BE30000-memory.dmp
memory/532-11-0x00000000030E0000-0x0000000003130000-memory.dmp
memory/1916-18-0x0000029CB8570000-0x0000029CB8580000-memory.dmp
memory/1916-34-0x0000029CB8670000-0x0000029CB8680000-memory.dmp
memory/1916-50-0x0000029CC09E0000-0x0000029CC09E1000-memory.dmp
memory/1916-52-0x0000029CC0A10000-0x0000029CC0A11000-memory.dmp
memory/1916-53-0x0000029CC0A10000-0x0000029CC0A11000-memory.dmp
memory/1916-54-0x0000029CC0B20000-0x0000029CC0B21000-memory.dmp
memory/3020-8-0x00007FFA33460000-0x00007FFA33F21000-memory.dmp
memory/3020-2-0x00000000028A0000-0x00000000028B0000-memory.dmp
memory/3020-1-0x00007FFA33460000-0x00007FFA33F21000-memory.dmp
memory/3020-0-0x0000000000500000-0x0000000000824000-memory.dmp