Analysis
- max time kernel
150s - max time network
158s - platform
windows11-21h2_x64 - resource
win11-20240221-en - resource tags
- submitted
25/03/2024, 12:57
General
- Target Client-built.exe
- Size 348KB
- Sample240325-p69scabc4v
- SHA256 1e7d5bd9d85650996c6576118409b53d0c677e4035baa3f4d2641d5e9a0b16f9
Malware Config
Extracted
-
quasar
-
1.3.0.0
-
Office04
-
Vallithebest-32755.portmap.host:32755
-
QSR_MUTEX_3gXoc7Rbb6gDK9k7Ha
-
encryption_key
NZgldVKwqeCAFECpbpDa
-
install_name
WindowsSound.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
AuthClient.exe
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- 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 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 9 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "AuthClient.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Users\Admin\AppData\Roaming\SubDir\WindowsSound.exe"C:\Users\Admin\AppData\Roaming\SubDir\WindowsSound.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "AuthClient.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\WindowsSound.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
WindowsSound.exe
memory/224-6-0x0000000006090000-0x00000000060A2000-memory.dmp
memory/224-1-0x0000000000760000-0x00000000007BE000-memory.dmp
memory/224-3-0x0000000005280000-0x0000000005312000-memory.dmp
memory/224-4-0x00000000051D0000-0x00000000051E0000-memory.dmp
memory/224-5-0x0000000005320000-0x0000000005386000-memory.dmp
memory/224-0-0x0000000074FE0000-0x0000000075791000-memory.dmp
memory/224-7-0x00000000064E0000-0x000000000651C000-memory.dmp
memory/224-2-0x0000000005830000-0x0000000005DD6000-memory.dmp
memory/224-16-0x0000000074FE0000-0x0000000075791000-memory.dmp
memory/3504-15-0x0000000005B00000-0x0000000005B10000-memory.dmp
memory/3504-14-0x0000000074FE0000-0x0000000075791000-memory.dmp
memory/3504-18-0x0000000007050000-0x000000000705A000-memory.dmp
memory/3504-19-0x0000000074FE0000-0x0000000075791000-memory.dmp
memory/3504-20-0x0000000005B00000-0x0000000005B10000-memory.dmp