##Al-Khaser v0.3

Content

• Introduction
• Possible uses
• Features
• Anti-debugging attacks
• Anti-Dumping
• Timing Attacks
• Human Interaction
• Anti-VM
• Requirements
• License

Introduction

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-Dumping

• Erase PE header from memory

Timing Attacks [Anti-Sandbox]

• Sleep -> SleepEx -> NtDelayExecution
• Sleep (in a loop a small delay) (todo)
• Sleep and check if accelerated (todo)
• SetTimer (Standard Windows Timers)
• timeSetEvent (Multimedia Timers)
• WaitForSingleObject -> WaitForSingleObjectEx -> NtWaitForSingleObject
• WaitForMultipleObjects -> WaitForMultipleObjectsEx -> NtWaitForMultipleObjects (todo)
• CreateWaitableTimer (todo)
• CreateTimerQueueTimer (todo)
• Big crypto loops (todo)

Human Interaction [Anti-Sandbox]

• Mouse (Single click / Double click) (todo)
• DialogBox (todo)
• Scrolling (todo)
• Execution after reboot (todo)
• CPU cores (todo) (Win32/Tinba)
• Sandbox known product IDs (todo)
• Color of background pixel
• Keyboard layout (Win32/Banload) (todo)

Anti-Virtualization

• Registry key value artifacts

  • HARDWARE\DEVICEMAP\Scsi\Scsi Port 0\Scsi Bus 0\Target Id 0\Logical Unit Id 0 (Identifier) (VBOX)
  • HARDWARE\Description\System (SystemBiosVersion) (VBOX)
  • HARDWARE\Description\System (VideoBiosVersion) (VIRTUALBOX)
  • HARDWARE\Description\System (SystemBiosDate) (06/23/99)
  • HARDWARE\DEVICEMAP\Scsi\Scsi Port 0\Scsi Bus 0\Target Id 0\Logical Unit Id 0 (Identifier) (VMWARE)
  • HARDWARE\DEVICEMAP\Scsi\Scsi Port 1\Scsi Bus 0\Target Id 0\Logical Unit Id 0 (Identifier) (VMWARE)
  • HARDWARE\DEVICEMAP\Scsi\Scsi Port 2\Scsi Bus 0\Target Id 0\Logical Unit Id 0 (Identifier) (VMWARE)

• 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"
  • SOFTWARE\VMware, Inc.\VMware Tools

• 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"
  • "system32\drivers\vmmouse.sys"
  • "system32\drivers\vmhgfs.sys"

• Directories artifacts

  • "%PROGRAMFILES%\oracle\virtualbox guest additions\"
  • "%PROGRAMFILES%\VMWare\"

• MAC Address

  • "\x08\x00\x27" (VBOX)
  • "\x00\x05\x69" (VMWARE)
  • "\x00\x0C\x29" (VMWARE)
  • "\x00\x1C\x14" (VMWARE)
  • "\x00\x50\x56" (VMWARE)

• Virtual devices

  • "\\.\VBoxMiniRdrDN"
  • "\\.\VBoxGuest"
  • "\\.\pipe\VBoxMiniRdDN"
  • "\\.\VBoxTrayIPC"
  • "\\.\pipe\VBoxTrayIPC")
  • "\\.\HGFS"
  • "\\.\vmci"

• Adapter name

  • VMWare

• Windows Class

  • VBoxTrayToolWndClass
  • VBoxTrayToolWnd

• Network shares

  • VirtualBox Shared Folders

• Processes

  • vboxservice.exe
  • vboxtray.exe
  • vmtoolsd.exe

• WMI

  • SELECT SerialNumber FROM Win32_Bios
  • SELECT DeviceId FROM Win32_PnPEntity

Code/DLL Injections techniques

• CreateRemoteThread
• SetWindowsHooksEx
• NtCreateThreadEx
• RtlCreateUserThread
• APC (QueueUserAPC / NtQueueApcThread)
• RunPE (GetThreadContext / SetThreadContext)

References

• An Anti-Reverse Engineering Guide By Josh Jackson.
• Anti-Unpacker Tricks By Peter Ferrie.
• The Art Of Unpacking By Mark Vincent Yason.
• Walied Assar's blog http://waleedassar.blogspot.de/
• Pafish tool: https://github.com/a0rtega/pafish