Analysis
- max time kernel
3s - max time network
275s - platform
windows10-2004_x64 - resource
win10v2004-20231222-de - resource tags
- submitted
10/01/2024, 19:52
General
- Target free_windows.exe
- Size 348KB
- Sample240110-yljvvsgbb8
- SHA256 37da85549e4e387812a9d59f25e1172324516641ab884a16da72719c40b49225
Malware Config
Extracted
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quasar
-
1.3.0.0
-
Office04
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172.16.40.30:4782
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QSR_MUTEX_w2uAciOW1UMmPO4cUV
-
encryption_key
pRS09vvOAEzyqRurZobQ
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install_name
svchost.exe
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log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Microsoft svchost
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 3 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 2 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 WriteProcessMemory 6 IoCs
Processes
-
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)
-
-
C:\Program Files (x86)\svchost.exe"C:\Program Files (x86)\svchost.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
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)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
svchost.exe
memory/1080-16-0x0000000074BC0000-0x0000000075370000-memory.dmp
memory/1080-20-0x0000000074BC0000-0x0000000075370000-memory.dmp
memory/1080-18-0x0000000007350000-0x000000000735A000-memory.dmp
memory/1304-4-0x00000000050F0000-0x0000000005100000-memory.dmp
memory/1304-6-0x0000000005E90000-0x0000000005EA2000-memory.dmp
memory/1304-7-0x0000000006400000-0x000000000643C000-memory.dmp
memory/1304-9-0x0000000006440000-0x0000000006460000-memory.dmp
memory/1304-8-0x0000000006490000-0x00000000064DA000-memory.dmp
memory/1304-5-0x0000000005180000-0x00000000051E6000-memory.dmp
memory/1304-0-0x0000000000720000-0x000000000077E000-memory.dmp
memory/1304-3-0x0000000005200000-0x0000000005292000-memory.dmp
memory/1304-2-0x00000000057B0000-0x0000000005D54000-memory.dmp
memory/1304-19-0x0000000074BC0000-0x0000000075370000-memory.dmp
memory/1304-1-0x0000000074BC0000-0x0000000075370000-memory.dmp