Analysis
- max time kernel
115s - max time network
133s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
21/01/2024, 16:01
General
- Target 9EEFA45EBC884B3B6FA4349D140963700C9F2C2543840.exe
- Size 3.1MB
- Sample240121-tf7yaaeed7
- SHA256 9eefa45ebc884b3b6fa4349d140963700c9f2c2543840d965b11c7f815346ab9
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
209.145.59.89:443
-
9d1a4f0d-2ea1-4330-81b0-244a91bf932c
-
encryption_key
B90D9A43F7C3BF3BBA75403410E571B5F80BA7E1
-
install_name
winboot.exe
-
log_directory
Logs
-
reconnect_delay
5000
-
startup_key
UEFI boot
-
subdirectory
bootufi
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 3 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in System32 directory 5 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
- 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\9EEFA45EBC884B3B6FA4349D140963700C9F2C2543840.exe"C:\Users\Admin\AppData\Local\Temp\9EEFA45EBC884B3B6FA4349D140963700C9F2C2543840.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "UEFI boot" /sc ONLOGON /tr "C:\Windows\system32\bootufi\winboot.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Windows\system32\bootufi\winboot.exe"C:\Windows\system32\bootufi\winboot.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "UEFI boot" /sc ONLOGON /tr "C:\Windows\system32\bootufi\winboot.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
winboot.exe
winboot.exe
memory/1128-10-0x00007FFE86510000-0x00007FFE86FD1000-memory.dmp
memory/1128-11-0x000000001B940000-0x000000001B950000-memory.dmp
memory/1128-13-0x000000001B950000-0x000000001BA02000-memory.dmp
memory/1128-12-0x0000000002F40000-0x0000000002F90000-memory.dmp
memory/1128-17-0x000000001B900000-0x000000001B93C000-memory.dmp
memory/1128-16-0x000000001B8A0000-0x000000001B8B2000-memory.dmp
memory/1128-18-0x00007FFE86510000-0x00007FFE86FD1000-memory.dmp
memory/1128-19-0x000000001B940000-0x000000001B950000-memory.dmp
memory/3532-2-0x0000000003440000-0x0000000003450000-memory.dmp
memory/3532-1-0x00007FFE86510000-0x00007FFE86FD1000-memory.dmp
memory/3532-9-0x00007FFE86510000-0x00007FFE86FD1000-memory.dmp
memory/3532-0-0x0000000000F40000-0x0000000001264000-memory.dmp