Analysis
- max time kernel
69s - max time network
136s - platform
windows10-2004_x64 - resource
win10v2004-20231222-en - resource tags
- submitted
15/01/2024, 02:27
General
- Target Client.exe
- Size 3.1MB
- Sample240115-cxevdsgef6
- SHA256 7b84e46a21b698a8b54a93bdea5194a1e52a4348f15c31b767ca498900221aa8
Malware Config
Extracted
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quasar
-
1.4.1
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Office04
-
192.168.1.68:4782
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461964e1-de1a-4d75-9bdd-aee2d3f65cfe
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encryption_key
4009B74D4B16F399513D4356C8A0B6FDB6C6FF4E
-
install_name
Client.exe
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log_directory
Logs
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reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 3 IoCs
- Blocklisted process makes network request 5 IoCs
- Executes dropped EXE 1 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\Client.exe"C:\Users\Admin\AppData\Local\Temp\Client.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe1⤵
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k UnistackSvcGroup1⤵
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C:\Windows\system32\rundll32.exerundll32.exe AppXDeploymentExtensions.OneCore.dll,ShellRefresh1⤵
- Blocklisted process makes network request
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Client.exe.log
Client.exe
Client.exe
memory/1900-9-0x00007FFB0D440000-0x00007FFB0DF01000-memory.dmp
memory/1900-2-0x000000001B7E0000-0x000000001B7F0000-memory.dmp
memory/1900-1-0x00007FFB0D440000-0x00007FFB0DF01000-memory.dmp
memory/1900-0-0x0000000000860000-0x0000000000B84000-memory.dmp
memory/2948-32-0x000001D91D740000-0x000001D91D750000-memory.dmp
memory/2948-16-0x000001D91D640000-0x000001D91D650000-memory.dmp
memory/2948-48-0x000001D925A70000-0x000001D925A71000-memory.dmp
memory/2948-50-0x000001D925AB0000-0x000001D925AB1000-memory.dmp
memory/2948-52-0x000001D925BB0000-0x000001D925BB1000-memory.dmp
memory/2948-51-0x000001D925AA0000-0x000001D925AA1000-memory.dmp
memory/3620-11-0x000000001BAD0000-0x000000001BAE0000-memory.dmp
memory/3620-15-0x000000001BAD0000-0x000000001BAE0000-memory.dmp
memory/3620-14-0x00007FFB0D440000-0x00007FFB0DF01000-memory.dmp
memory/3620-13-0x000000001C540000-0x000000001C5F2000-memory.dmp
memory/3620-12-0x000000001C430000-0x000000001C480000-memory.dmp
memory/3620-10-0x00007FFB0D440000-0x00007FFB0DF01000-memory.dmp