antidebug.yar

/*
    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.

*/

import "pe"

rule DebuggerCheck__API : AntiDebug DebuggerCheck {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="IsDebuggerPresent"
	condition:
		any of them
}

rule DebuggerCheck__PEB : AntiDebug DebuggerCheck {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="IsDebugged"
	condition:
		any of them
}

rule DebuggerCheck__GlobalFlags : AntiDebug DebuggerCheck {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="NtGlobalFlags"
	condition:
		any of them
}

rule DebuggerCheck__QueryInfo : AntiDebug DebuggerCheck {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="QueryInformationProcess"
	condition:
		any of them
}

rule DebuggerCheck__RemoteAPI : AntiDebug DebuggerCheck {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="CheckRemoteDebuggerPresent"
	condition:
		any of them
}

rule DebuggerHiding__Thread : AntiDebug DebuggerHiding {
	meta:
	    Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
		weight = 1
	strings:
		$ ="SetInformationThread"
	condition:
		any of them
}

rule DebuggerHiding__Active : AntiDebug DebuggerHiding {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="DebugActiveProcess"
	condition:
		any of them
}

rule DebuggerTiming__PerformanceCounter : AntiDebug DebuggerTiming {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="QueryPerformanceCounter"
	condition:
		any of them
}

rule DebuggerTiming__Ticks : AntiDebug DebuggerTiming {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="GetTickCount"
	condition:
		any of them
}

rule DebuggerOutput__String : AntiDebug DebuggerOutput {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="OutputDebugString"
	condition:
		any of them
}

rule DebuggerException__UnhandledFilter : AntiDebug DebuggerException {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="SetUnhandledExceptionFilter"
	condition:
		any of them
}

rule DebuggerException__ConsoleCtrl : AntiDebug DebuggerException {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="GenerateConsoleCtrlEvent"
	condition:
		any of them
}

rule DebuggerException__SetConsoleCtrl : AntiDebug DebuggerException {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="SetConsoleCtrlHandler"
	condition:
		any of them
}

rule ThreadControl__Context : AntiDebug ThreadControl {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="SetThreadContext"
	condition:
		any of them
}

rule DebuggerCheck__DrWatson : AntiDebug DebuggerCheck {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ ="__invoke__watson"
	condition:
		any of them
}

rule SEH__v3 : AntiDebug SEH {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ = "____except__handler3"
		$ = "____local__unwind3"
	condition:
		any of them
}

rule SEH__v4 : AntiDebug SEH {
    // VS 8.0+
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ = "____except__handler4"
		$ = "____local__unwind4"
		$ = "__XcptFilter"
	condition:
		any of them
}

rule SEH__vba : AntiDebug SEH {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ = "vbaExceptHandler"
	condition:
		any of them
}

rule SEH__vectored : AntiDebug SEH {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ = "AddVectoredExceptionHandler"
		$ = "RemoveVectoredExceptionHandler"
	condition:
		any of them
}


rule DebuggerPattern__RDTSC : AntiDebug DebuggerPattern {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ = {0F 31}
	condition:
		any of them
}

rule DebuggerPattern__CPUID : AntiDebug DebuggerPattern {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ = {0F A2}
	condition:
		any of them
}

rule DebuggerPattern__SEH_Saves : AntiDebug DebuggerPattern {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ = {64 ff 35 00 00 00 00}
	condition:
		any of them
}

rule DebuggerPattern__SEH_Inits : AntiDebug DebuggerPattern {
	meta:
		weight = 1
		Author = "naxonez"
		reference = "https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara"
	strings:
		$ = {64 89 25 00 00 00 00}
	condition:
		any of them
}


rule Check_Dlls
{
	meta:
		Author = "Nick Hoffman"
		Description = "Checks for common sandbox dlls"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	strings:
		$dll1 = "sbiedll.dll" wide nocase ascii fullword
		$dll2 = "dbghelp.dll" wide nocase ascii fullword
		$dll3 = "api_log.dll" wide nocase ascii fullword
		$dll4 = "dir_watch.dll" wide nocase ascii fullword
		$dll5 = "pstorec.dll" wide nocase ascii fullword
		$dll6 = "vmcheck.dll" wide nocase ascii fullword
		$dll7 = "wpespy.dll" wide nocase ascii fullword
	condition:
		2 of them
}

rule Check_Qemu_Description
{
	meta:
		Author = "Nick Hoffman"
		Description = "Checks for QEMU systembiosversion key"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	strings:
		$key = "HARDWARE\\Description\\System" nocase wide ascii
		$value = "SystemBiosVersion" nocase wide ascii
		$data = "QEMU" wide nocase ascii
	condition:
		all of them
}

rule Check_Qemu_DeviceMap
{
	meta:
		Author = "Nick Hoffman"
		Description = "Checks for Qemu reg keys"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	strings:
		$key = "HARDWARE\\DEVICEMAP\\Scsi\\Scsi Port 0\\Scsi Bus 0\\Target Id 0\\Logical Unit Id 0" nocase wide ascii
		$value = "Identifier" nocase wide ascii
		$data = "QEMU" wide nocase ascii
	condition:
		all of them
}

rule Check_VBox_Description
{
	meta:
		Author = "Nick Hoffman"
		Description = "Checks Vbox description reg key"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	strings:
		$key = "HARDWARE\\Description\\System" nocase wide ascii
		$value = "SystemBiosVersion" nocase wide ascii
		$data = "VBOX" nocase wide ascii		
	condition:
		all of them
}
rule Check_VBox_DeviceMap
{
	meta:
		Author = "Nick Hoffman"
		Description = "Checks Vbox registry keys"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	strings:
		$key = "HARDWARE\\DEVICEMAP\\Scsi\\Scsi Port 0\\Scsi Bus 0\\Target Id 0\\Logical Unit Id 0" nocase wide ascii
		$value = "Identifier" nocase wide ascii
		$data = "VBOX" nocase wide ascii
	condition:
		all of them
}
rule Check_VBox_Guest_Additions
{
	meta:
		Author = "Nick Hoffman"
		Description = "Checks for the existence of the guest additions registry key"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	strings:
		$key = "SOFTWARE\\Oracle\\VirtualBox Guest Additions" wide ascii nocase
	condition:
		any of them	
}
rule Check_VBox_VideoDrivers
{
	meta:
		Author = "Nick Hoffman"
		Description = "Checks for reg keys of Vbox video drivers"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	strings:
		$key = "HARDWARE\\Description\\System" nocase wide ascii
		$value = "VideoBiosVersion" wide nocase ascii
		$data = "VIRTUALBOX" nocase wide ascii
	condition:
		all of them
}
rule Check_VMWare_DeviceMap
{
	meta:
		Author = "Nick Hoffman"
		Description = "Checks for the existence of VmWare Registry Keys"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	strings:
		$key = "HARDWARE\\DEVICEMAP\\Scsi\\Scsi Port 0\\Scsi Bus 0\\Target Id 0\\Logical Unit Id 0" wide ascii nocase
		$value = "Identifier" wide nocase ascii
		$data = "VMware" wide nocase ascii
	condition:
		all of them
}
rule Check_VmTools
{
	meta:
		Author = "Nick Hoffman"
		Description = "Checks for the existence of VmTools reg key"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	strings:
		$ ="SOFTWARE\\VMware, Inc.\\VMware Tools" nocase ascii wide
	condition:
		any of them
}
rule Check_Wine
{
	meta:
		Author = "Nick Hoffman"
		Description = "Checks for the existence of Wine"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	strings:
		$ ="wine_get_unix_file_name"
	condition:
		any of them
}

rule vmdetect
{
    meta:
        author = "nex"
        description = "Possibly employs anti-virtualization techniques"

    strings:
        // Binary tricks
        $vmware = {56 4D 58 68}
        $virtualpc = {0F 3F 07 0B}
        $ssexy = {66 0F 70 ?? ?? 66 0F DB ?? ?? ?? ?? ?? 66 0F DB ?? ?? ?? ?? ?? 66 0F EF}
        $vmcheckdll = {45 C7 00 01}
        $redpill = {0F 01 0D 00 00 00 00 C3}

        // Random strings
        $vmware1 = "VMXh"
        $vmware2 = "Ven_VMware_" nocase
        $vmware3 = "Prod_VMware_Virtual_" nocase
        $vmware4 = "hgfs.sys" nocase
        $vmware5 = "mhgfs.sys" nocase
        $vmware6 = "prleth.sys" nocase
        $vmware7 = "prlfs.sys" nocase
        $vmware8 = "prlmouse.sys" nocase
        $vmware9 = "prlvideo.sys" nocase
        $vmware10 = "prl_pv32.sys" nocase
        $vmware11 = "vpc-s3.sys" nocase
        $vmware12 = "vmsrvc.sys" nocase
        $vmware13 = "vmx86.sys" nocase
        $vmware14 = "vmnet.sys" nocase
        $vmware15 = "vmicheartbeat" nocase
        $vmware16 = "vmicvss" nocase
        $vmware17 = "vmicshutdown" nocase
        $vmware18 = "vmicexchange" nocase
        $vmware19 = "vmdebug" nocase
        $vmware20 = "vmmouse" nocase
        $vmware21 = "vmtools" nocase
        $vmware22 = "VMMEMCTL" nocase
        $vmware23 = "vmx86" nocase
        $vmware24 = "vmware" nocase
        $virtualpc1 = "vpcbus" nocase
        $virtualpc2 = "vpc-s3" nocase
        $virtualpc3 = "vpcuhub" nocase
        $virtualpc4 = "msvmmouf" nocase
        $xen1 = "xenevtchn" nocase
        $xen2 = "xennet" nocase
        $xen3 = "xennet6" nocase
        $xen4 = "xensvc" nocase
        $xen5 = "xenvdb" nocase
        $xen6 = "XenVMM" nocase
        $virtualbox1 = "VBoxHook.dll" nocase
        $virtualbox2 = "VBoxService" nocase
        $virtualbox3 = "VBoxTray" nocase
        $virtualbox4 = "VBoxMouse" nocase
        $virtualbox5 = "VBoxGuest" nocase
        $virtualbox6 = "VBoxSF" nocase
        $virtualbox7 = "VBoxGuestAdditions" nocase
        $virtualbox8 = "VBOX HARDDISK"  nocase

        // MAC addresses
        $vmware_mac_1a = "00-05-69"
        $vmware_mac_1b = "00:05:69"
        $vmware_mac_1c = "000569"
        $vmware_mac_2a = "00-50-56"
        $vmware_mac_2b = "00:50:56"
        $vmware_mac_2c = "005056"
        $vmware_mac_3a = "00-0C-29" nocase
        $vmware_mac_3b = "00:0C:29" nocase
        $vmware_mac_3c = "000C29" nocase
        $vmware_mac_4a = "00-1C-14" nocase
        $vmware_mac_4b = "00:1C:14" nocase
        $vmware_mac_4c = "001C14" nocase
        $virtualbox_mac_1a = "08-00-27"
        $virtualbox_mac_1b = "08:00:27"
        $virtualbox_mac_1c = "080027"

    condition:
        any of them
}

rule Check_Debugger
{
	meta:
		Author = "Nick Hoffman"
		Description = "Looks for both isDebuggerPresent and CheckRemoteDebuggerPresent"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	condition:
		pe.imports("kernel32.dll","CheckRemoteDebuggerPresent") and 
		pe.imports("kernel32.dll","IsDebuggerPresent")
}

rule Check_DriveSize
{
	meta:
		Author = "Nick Hoffman"
		Description = "Rule tries to catch uses of DeviceIOControl being used to get the drive size"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"

	strings:
		$physicaldrive = "\\\\.\\PhysicalDrive0" wide ascii nocase
		$dwIoControlCode = {68 5c 40 07 00 [0-5] FF 15} //push 7405ch ; push esi (handle) then call deviceoiocontrol IOCTL_DISK_GET_LENGTH_INFO	
	condition:
		pe.imports("kernel32.dll","CreateFileA") and 	
		pe.imports("kernel32.dll","DeviceIoControl") and 
		$dwIoControlCode and
		$physicaldrive
}
rule Check_FilePaths
{
	meta:
		Author = "Nick Hoffman"
		Description = "Checks for filepaths containing popular sandbox names"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	strings: 
		$path1 = "SANDBOX" wide ascii
		$path2 = "\\SAMPLE" wide ascii
		$path3 = "\\VIRUS" wide ascii
	condition:
		all of ($path*) and pe.imports("kernel32.dll","GetModuleFileNameA")
}

rule Check_UserNames
{
	meta:
		Author = "Nick Hoffman"
		Description = "Looks for malware checking for common sandbox usernames"
		Sample = "de1af0e97e94859d372be7fcf3a5daa5"
	strings:
		$user1 = "MALTEST" wide ascii
		$user2 = "TEQUILABOOMBOOM" wide ascii
		$user3 = "SANDBOX" wide ascii
		$user4 = "VIRUS" wide ascii
		$user5 = "MALWARE" wide ascii
	condition:
		all of ($user*)  and pe.imports("advapi32.dll","GetUserNameA")
}


rule Check_OutputDebugStringA_iat
{

	meta:
		Author = "http://twitter.com/j0sm1"
		Description = "Detect in IAT OutputDebugstringA"
		Date = "20/04/2015"

	condition:
		pe.imports("kernel32.dll","OutputDebugStringA")
}

rule Check_unhandledExceptionFiler_iat {

	meta:
		Author = "http://twitter.com/j0sm1"
		Description = "it's checked if UnhandledExceptionFilter is imported" 
		Date = "20/04/2015"
		Reference = "http://www.codeproject.com/Articles/30815/An-Anti-Reverse-Engineering-Guide#UnhandledExceptionFilter"
		
	condition:
		pe.imports("kernel32.dll","UnhandledExceptionFilter")	
}

rule check_RaiseException_iat {

	meta:
		Author = "http://twitter.com/j0sm1"
		Description = "it's checked if RaiseException is imported" 
		Date = "20/04/2015"
		Reference = "http://waleedassar.blogspot.com.es/2012/11/ollydbg-raiseexception-bug.html"
		
	condition:
		pe.imports("kernel32.dll","RaiseException")	
}

rule Check_FindWindowA_iat {

	meta:
		Author = "http://twitter.com/j0sm1"
		Description = "it's checked if FindWindowA() is imported" 
		Date = "20/04/2015"
		Reference = "http://www.codeproject.com/Articles/30815/An-Anti-Reverse-Engineering-Guide#OllyFindWindow"
		
	strings:
		$ollydbg = "OLLYDBG"
		$windbg = "WinDbgFrameClass"
		
	condition:
		pe.imports("user32.dll","FindWindowA") and ($ollydbg or $windbg)
}

rule DebuggerCheck__MemoryWorkingSet : AntiDebug DebuggerCheck {
	meta:
		author = "Fernando Mercês"
		date = "2015-06"
		description = "Anti-debug process memory working set size check"
		reference = "http://www.gironsec.com/blog/2015/06/anti-debugger-trick-quicky/"

	condition:
		pe.imports("kernel32.dll", "K32GetProcessMemoryInfo") and
		pe.imports("kernel32.dll", "GetCurrentProcess")
}