Analysis
- max time kernel
48s - max time network
60s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
17/02/2024, 11:49
General
- Target free_windows.exe
- Size 348KB
- Sample240217-nzgbsafa29
- SHA256 37da85549e4e387812a9d59f25e1172324516641ab884a16da72719c40b49225
Malware Config
Extracted
-
quasar
-
1.3.0.0
-
Office04
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172.16.40.30:4782
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QSR_MUTEX_w2uAciOW1UMmPO4cUV
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encryption_key
pRS09vvOAEzyqRurZobQ
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install_name
svchost.exe
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log_directory
Logs
-
reconnect_delay
3000
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startup_key
Microsoft svchost
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 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.
- Drops file in Program Files directory 3 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 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 9 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\free_windows.exe"C:\Users\Admin\AppData\Local\Temp\free_windows.exe"1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "Microsoft svchost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\free_windows.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
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C:\Program Files (x86)\svchost.exe"C:\Program Files (x86)\svchost.exe"2⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"schtasks" /create /tn "Microsoft svchost" /sc ONLOGON /tr "C:\Program Files (x86)\svchost.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
svchost.exe
memory/2676-6-0x0000000005700000-0x0000000005712000-memory.dmp
memory/2676-2-0x0000000005970000-0x0000000005F14000-memory.dmp
memory/2676-3-0x0000000005290000-0x0000000005322000-memory.dmp
memory/2676-4-0x0000000005380000-0x0000000005390000-memory.dmp
memory/2676-5-0x0000000005730000-0x0000000005796000-memory.dmp
memory/2676-0-0x00000000750B0000-0x0000000075860000-memory.dmp
memory/2676-7-0x0000000006880000-0x00000000068BC000-memory.dmp
memory/2676-1-0x0000000000870000-0x00000000008CE000-memory.dmp
memory/2676-15-0x00000000750B0000-0x0000000075860000-memory.dmp
memory/2956-14-0x00000000750B0000-0x0000000075860000-memory.dmp
memory/2956-17-0x0000000007320000-0x000000000732A000-memory.dmp
memory/2956-18-0x00000000750B0000-0x0000000075860000-memory.dmp