Analysis
- max time kernel
151s - max time network
159s - platform
windows11-21h2_x64 - resource
win11-20240221-en - resource tags
- submitted
23/03/2024, 19:56
General
- Target Client-built.exe
- Size 348KB
- Sample240323-yn5kcaeb6s
- SHA256 169c150e8f08da5a4ab2b46bc67cdd1d2d006a060b39d66e559dbfdc53017414
Malware Config
Extracted
-
quasar
-
1.3.0.0
-
Office04
-
Vallithebest-32755.portmap.host:32755
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QSR_MUTEX_3gXoc7Rbb6gDK9k7Ha
-
encryption_key
MgIQlrEArYoUL3gDO4iZ
-
install_name
WindowsSound.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
WindowsSound.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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "WindowsSound.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
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "WindowsSound.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/1108-20-0x0000000005800000-0x0000000005810000-memory.dmp
memory/1108-19-0x0000000074B20000-0x00000000752D1000-memory.dmp
memory/1108-18-0x0000000006E80000-0x0000000006E8A000-memory.dmp
memory/1108-16-0x0000000005800000-0x0000000005810000-memory.dmp
memory/1108-14-0x0000000074B20000-0x00000000752D1000-memory.dmp
memory/3140-6-0x0000000006740000-0x0000000006752000-memory.dmp
memory/3140-7-0x0000000006B90000-0x0000000006BCC000-memory.dmp
memory/3140-0-0x0000000000D10000-0x0000000000D6E000-memory.dmp
memory/3140-15-0x0000000074B20000-0x00000000752D1000-memory.dmp
memory/3140-5-0x00000000059A0000-0x0000000005A06000-memory.dmp
memory/3140-4-0x00000000057A0000-0x00000000057B0000-memory.dmp
memory/3140-3-0x00000000057B0000-0x0000000005842000-memory.dmp
memory/3140-2-0x0000000005E50000-0x00000000063F6000-memory.dmp
memory/3140-1-0x0000000074B20000-0x00000000752D1000-memory.dmp