Analysis
- max time kernel
593s - max time network
601s - platform
windows10-2004_x64 - resource
win10v2004-20240508-en - resource tags
- submitted
10/05/2024, 13:12
General
- Target BloxStrap v2.5.4.1.exe
- Size 3.1MB
- Sample240510-qfhfvabe87
- SHA256 52f9d1a2c3d4518da21b3426a0ccefb04e07316755f97de9eaaecc1e09c4b5c7
Malware Config
Extracted
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quasar
-
1.4.1
-
Office04
-
192.168.1.114:4782
-
10d94abb-0198-407e-aa98-bb80c5b37835
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encryption_key
45C885494447187E9FBAD6C4E1ACD4A1590FC706
-
install_name
Client.exe
-
log_directory
Logs
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reconnect_delay
3000
-
startup_key
Runtime
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in System32 directory 5 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- 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 FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 IoCs
- Suspicious use of SetWindowsHookEx 1 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
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C:\Users\Admin\AppData\Local\Temp\BloxStrap v2.5.4.1.exe"C:\Users\Admin\AppData\Local\Temp\BloxStrap v2.5.4.1.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Runtime" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
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C:\Windows\system32\SubDir\Client.exe"C:\Windows\system32\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Runtime" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.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
Client.exe
memory/1628-0-0x00007FF9F4E93000-0x00007FF9F4E95000-memory.dmp
memory/1628-1-0x00000000000D0000-0x00000000003F4000-memory.dmp
memory/1628-2-0x00007FF9F4E90000-0x00007FF9F5951000-memory.dmp
memory/1628-9-0x00007FF9F4E90000-0x00007FF9F5951000-memory.dmp
memory/4844-10-0x00007FF9F4E90000-0x00007FF9F5951000-memory.dmp
memory/4844-11-0x00007FF9F4E90000-0x00007FF9F5951000-memory.dmp
memory/4844-12-0x000000001DD40000-0x000000001DD90000-memory.dmp
memory/4844-13-0x000000001DE50000-0x000000001DF02000-memory.dmp
memory/4844-14-0x00007FF9F4E90000-0x00007FF9F5951000-memory.dmp