Al-Khaser - Public Malware Techniques Used In The Wild

Monday, March 21, 2016



al-khaser is a PoC malware with good intentions that aimes to stress your anti-malware system. It performs a bunch of nowadays malwares tricks and the goal is to see if you catch them all.

Possible uses
  • You are making an anti-debug plugin and you want to check its effectiveness.
  • You want to ensure that your sandbox solution is hidden enough.
  • Or you want to ensure that your malware analysis environement is well hidden.
Please, if you encounter any of the anti-analysis tricks which you have seen in a malware, don't hesitate to contribute.

Features

Anti-debugging attacks
  • IsDebuggerPresent
  • CheckRemoteDebuggerPresent
  • Process Environement Block (BeingDebugged)
  • Process Environement Block (NtGlobalFlag)
  • ProcessHeap (Flags)
  • ProcessHeap (ForceFlags)
  • NtQueryInformationProcess (ProcessDebugPort)
  • NtQueryInformationProcess (ProcessDebugFlags)
  • NtQueryInformationProcess (ProcessDebugObject)
  • NtSetInformationThread (HideThreadFromDebugger)
  • NtQueryObject (ObjectTypeInformation)
  • NtQueryObject (ObjectAllTypesInformation)
  • CloseHanlde (NtClose) Invalide Handle
  • UnhandledExceptionFilter
  • OutputDebugString (GetLastError())
  • Hardware Breakpoints (SEH / GetThreadContext)
  • Software Breakpoints (INT3 / 0xCC)
  • Memory Breakpoints (PAGE_GUARD)
  • Interrupt 0x2d
  • Interrupt 1
  • Parent Process (Explorer.exe)
  • SeDebugPrivilege (Csrss.exe)
  • NtYieldExecution / SwitchToThread

Anti-virtualization
  • Virtualbox registry key values artifacts:
    • "HARDWARE\DEVICEMAP\Scsi\Scsi Port 0\Scsi Bus 0\Target Id 0\Logical Unit Id 0 (Identifier)
    • HARDWARE\Description\System (SystemBiosVersion)
    • HARDWARE\Description\System (VideoBiosVersion)
    • HARDWARE\Description\System (SystemBiosDate)
  • Virtualbox registry Keys artifacts
    • "HARDWARE\ACPI\RSDT\VBOX__"
    • "HARDWARE\ACPI\FADT\VBOX__"
    • "HARDWARE\ACPI\RSDT\VBOX__"
    • "SOFTWARE\Oracle\VirtualBox Guest Additions"
    • "SYSTEM\ControlSet001\Services\VBoxGuest"
    • "SYSTEM\ControlSet001\Services\VBoxMouse"
    • "SYSTEM\ControlSet001\Services\VBoxService"
    • "SYSTEM\ControlSet001\Services\VBoxSF"
    • "SYSTEM\ControlSet001\Services\VBoxVideo"
  • Virtualbox file system artifacts:
    • "system32\drivers\VBoxMouse.sys"
    • "system32\drivers\VBoxGuest.sys"
    • "system32\drivers\VBoxSF.sys"
    • "system32\drivers\VBoxVideo.sys"
    • "system32\vboxdisp.dll"
    • "system32\vboxhook.dll"
    • "system32\vboxmrxnp.dll"
    • "system32\vboxogl.dll"
    • "system32\vboxoglarrayspu.dll"
    • "system32\vboxoglcrutil.dll"
    • "system32\vboxoglerrorspu.dll"
    • "system32\vboxoglfeedbackspu.dll"
    • "system32\vboxoglpackspu.dll"
    • "system32\vboxoglpassthroughspu.dll"
    • "system32\vboxservice.exe"
    • "system32\vboxtray.exe"
    • "system32\VBoxControl.exe"
  • Virtualbox directories artifacts:
    • "oracle\virtualbox guest additions\"
  • Virtualbox MAC Address:
    • "\x08\x00\x27"
  • Virtualbox virtual devices:
    • "\\.\VBoxMiniRdrDN"
    • "\\.\VBoxGuest"
    • "\\.\pipe\VBoxMiniRdDN"
    • "\\.\VBoxTrayIPC"
    • "\\.\pipe\VBoxTrayIPC")
  • Virtualbox Windows Class
    • VBoxTrayToolWndClass
    • VBoxTrayToolWnd
  • Virtualbox network share
    • VirtualBox Shared Folders
  • Virtualbox process list
    • vboxservice.exe
    • vboxtray.exe

Anti Dumping
  • Erase PE header from memory

Code/DLL Injections techniques
  • CreateRemoteThread
  • SetWindowsHooksEx
  • NtCreateThreadEx
  • RtlCreateUserThread
  • APC (QueueUserAPC / NtQueueApcThread)
  • RunPE (GetThreadContext / SetThreadContext)

Timing Attacks
  • Sleep -> SleepEx -> NtDelayExecution
  • SetTimer (Standard Windows Timers)
  • timeSetEvent (Multimedia Timers)




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