Analysis
- max time kernel
266s - max time network
271s - platform
windows10-2004_x64 - resource
win10v2004-20240508-en - resource tags
- submitted
01/06/2024, 01:37
General
- Target Update.exe
- Size 20.4MB
- Sample240601-b2cedsdc2z
- SHA256 4a424271b9a191afc76110e2bccd45f23cc281853f223d3e27756e16c14b5019
Malware Config
Extracted
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quasar
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1.4.1
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EmmasSub
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85.23.24.170:4782
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85.23.109.34:4782
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82.128.254.93:4782
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f82c7021-f558-4f6f-bbb3-fbe420c708e5
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encryption_key
4DC093FC202D016F95DCEE92AAF2874F56ACC3F2
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install_name
RuntimeBroker.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Windows Update
-
subdirectory
WindowsSecureManager
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
- Executes dropped EXE 3 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Drops file in System32 directory 5 IoCs
- Drops file in Program Files directory 8 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Checks SCSI registry key(s) 3 TTPs 3 IoCs
SCSI information is often read in order to detect sandboxing environments.
- Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Modifies registry class 19 IoCs
- Suspicious behavior: EnumeratesProcesses 59 IoCs
- Suspicious use of AdjustPrivilegeToken 8 IoCs
- Suspicious use of FindShellTrayWindow 64 IoCs
- Suspicious use of SendNotifyMessage 64 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 17 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\Update.exe"C:\Users\Admin\AppData\Local\Temp\Update.exe"1⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\is-35RJD.tmp\Update.tmp"C:\Users\Admin\AppData\Local\Temp\is-35RJD.tmp\Update.tmp" /SL5="$501CC,20549816,832512,C:\Users\Admin\AppData\Local\Temp\Update.exe"2⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /C ""C:\Program Files (x86)\MyFolder\me.bat""3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exepowershell -Command "Add-MpPreference -ExclusionProcess 'C:\WINDOWS\system32\WindowsSecureManager\RuntimeBroker.exe'"4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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-
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C:\Program Files (x86)\MyFolder\RunMe.exe"C:\Program Files (x86)\MyFolder\RunMe.exe"3⤵
- Executes dropped EXE
- 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 "Windows Update" /sc ONLOGON /tr "C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe" /rl HIGHEST /f4⤵
- Creates scheduled task(s)
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C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe"C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe"4⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Windows\system32\WindowsSecureManager\RuntimeBroker.exe" /rl HIGHEST /f5⤵
- Creates scheduled task(s)
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C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵
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C:\Windows\system32\taskmgr.exe"C:\Windows\system32\taskmgr.exe" /71⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
RunMe.exe
me.bat
__PSScriptPolicyTest_iyfu3kmx.53y.ps1
Update.tmp
memory/668-0-0x0000000000400000-0x00000000004D8000-memory.dmp
memory/668-2-0x0000000000401000-0x00000000004B7000-memory.dmp
memory/668-8-0x0000000000400000-0x00000000004D8000-memory.dmp
memory/668-89-0x0000000000400000-0x00000000004D8000-memory.dmp
memory/1020-96-0x000000001D170000-0x000000001D1C0000-memory.dmp
memory/1020-97-0x000000001D7C0000-0x000000001D872000-memory.dmp
memory/1020-98-0x000000001E0F0000-0x000000001E618000-memory.dmp
memory/1164-109-0x000001394C270000-0x000001394C271000-memory.dmp
memory/1164-101-0x000001394C270000-0x000001394C271000-memory.dmp
memory/1164-111-0x000001394C270000-0x000001394C271000-memory.dmp
memory/1164-110-0x000001394C270000-0x000001394C271000-memory.dmp
memory/1164-105-0x000001394C270000-0x000001394C271000-memory.dmp
memory/1164-99-0x000001394C270000-0x000001394C271000-memory.dmp
memory/1164-100-0x000001394C270000-0x000001394C271000-memory.dmp
memory/1164-106-0x000001394C270000-0x000001394C271000-memory.dmp
memory/1164-107-0x000001394C270000-0x000001394C271000-memory.dmp
memory/1164-108-0x000001394C270000-0x000001394C271000-memory.dmp
memory/1696-85-0x00000000004D0000-0x00000000007F4000-memory.dmp
memory/2596-65-0x0000000000400000-0x000000000071C000-memory.dmp
memory/2596-9-0x0000000000400000-0x000000000071C000-memory.dmp
memory/2596-6-0x0000000000400000-0x000000000071C000-memory.dmp
memory/2596-88-0x0000000000400000-0x000000000071C000-memory.dmp
memory/3484-37-0x00000000060D0000-0x0000000006136000-memory.dmp
memory/3484-53-0x0000000006DC0000-0x0000000006DF2000-memory.dmp
memory/3484-71-0x0000000007B10000-0x0000000007B2A000-memory.dmp
memory/3484-72-0x0000000007BA0000-0x0000000007BAA000-memory.dmp
memory/3484-73-0x0000000007DB0000-0x0000000007E46000-memory.dmp
memory/3484-74-0x0000000007D30000-0x0000000007D41000-memory.dmp
memory/3484-75-0x0000000007D60000-0x0000000007D6E000-memory.dmp
memory/3484-76-0x0000000007D70000-0x0000000007D84000-memory.dmp
memory/3484-77-0x0000000007E70000-0x0000000007E8A000-memory.dmp
memory/3484-78-0x0000000007E50000-0x0000000007E58000-memory.dmp
memory/3484-81-0x0000000073DB0000-0x0000000074560000-memory.dmp
memory/3484-69-0x0000000073DB0000-0x0000000074560000-memory.dmp
memory/3484-68-0x0000000073DB0000-0x0000000074560000-memory.dmp
memory/3484-70-0x0000000008160000-0x00000000087DA000-memory.dmp
memory/3484-67-0x00000000079E0000-0x0000000007A83000-memory.dmp
memory/3484-64-0x0000000073DB0000-0x0000000074560000-memory.dmp
memory/3484-66-0x00000000079B0000-0x00000000079CE000-memory.dmp
memory/3484-54-0x0000000070260000-0x00000000702AC000-memory.dmp
memory/3484-51-0x0000000006820000-0x000000000686C000-memory.dmp
memory/3484-50-0x00000000067E0000-0x00000000067FE000-memory.dmp
memory/3484-49-0x0000000006220000-0x0000000006574000-memory.dmp
memory/3484-48-0x0000000073DB0000-0x0000000074560000-memory.dmp
memory/3484-38-0x00000000061B0000-0x0000000006216000-memory.dmp
memory/3484-36-0x0000000005FE0000-0x0000000006002000-memory.dmp
memory/3484-35-0x00000000059B0000-0x0000000005FD8000-memory.dmp
memory/3484-34-0x0000000073DB0000-0x0000000074560000-memory.dmp
memory/3484-33-0x0000000003240000-0x0000000003276000-memory.dmp
memory/3484-32-0x0000000073DBE000-0x0000000073DBF000-memory.dmp