Digital Forensics Part 46 Event Log Forensics


Online (active) live system ကုိေတာ့ incident Response အတြက္သာ အဓိကထားသုံးတာမ်ားပါတယ္။ Offline (System Power Off) အေနအထားမွာလဲ Event Log က investigation လုပ္လုိ႕ရပါတယ္။ ဘာလုိ႕လဲဆုိရင္ Event Log က Non-Volatile Information ျဖစ္လုိ႕ပါ။
Power Off သြားရင္လဲ Log က်န္ပါတယ္။
Event log ဟာ Binary Data Base ျဖစ္တဲ့အတြက္ .evt .evtx file extension ျဖစ္ပါတယ္။ Event View ကေနကုိယ္လုိအပ္တဲ့ System Log, Application log , Security log စသည့္ျဖင့္ တစ္ခုျခင္း ေရြးၿပီး save ႏုိင္ပါတယ္။ save လုိ႕ရမယ့္ File extension ေတြကေတာ့ .evtx .cvs .xml .cvs တုိ႕ျဖစ္ပါတယ္။
ဖြင္လုိ႕ရတဲ့ Event View ေတြအမ်ားၾကီးပါ။ အျမင္ရွင္းရွင္းၾကည့္လုိ႕ရတာနဲ႕ မရတာပဲ ကြာပါတယ္။
Event log file ေတြအကုန္ရွိတဲ့ေနရာကေတာ့ C:\Windows\System32\winevt\Logs
ျဖစ္ပါတယ္။ ေနာက္ပုိင္း MS Window , MS Server မွာေနရာတူပါတယ္။
Registry ေနရာကေတာ့ Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventLog
Event Log ကေန ရႏုိင္မဲ့ အခ်က္အလက္ေတြကေတာ့
Password အေၿပာင္းအလဲ Time and Date အေၿပာင္းအလဲ
User logon နဲ႔ logout OS start နဲ႔ Stop time
User account permission အေၿပာင္းအလဲ
USB attachment အခ်က္အလက္ေတြ ရႏုိင္ပါတယ္။
အေရးပါတဲ့ Event log ေတြကေတာ့
Windows Event log,System Event Log, Security Event Log,Application Event Log,Directory နဲ႕ DNS Event Log
MS server မွေတာ့ log အခ်ဳိ႕က သီးျခား enable လုပ္ေပးထားမွသာေပၚပါတယ္။ User ကလဲ Log ေတြကုိ မက်န္ေအာင္ disable လုပ္ထားလုိ႔ရပါ
တယ္။ save ယူမဲ့ စက္က System Time မမွန္ရင္လဲ အခက္ခဲရွိပါတယ္။
Computer Name Usernames Date Time ေတြလဲ ခ်ိန္းထားႏုိင္ပါတယ္။
log ေတြကုိ အျခားေနရာမွာလဲ သိမ္းဆည္းထားတတ္ပါတယ္။
Law Enforcement ေတြသာအသုံးၿပဳေနတဲ့ Forensics tools ေတြမွာေတာ့ investigatorကေန အခ်ိန္ကုန္ေအာင္ Event view ေခၚ file path ေတြ လုိက္ရွာၿပီး save စရာ ရွာစရာ မလုိအပ္ပါဘူး ကုိယ္လုိခ်င္တဲ့ အပုိင္းကုိသာ filter သုိ႕မဟုတ္ Click လုပ္ရုံပါပဲ။ တစ္ကယ္တန္းေတာ့ Forensics Tools ဆုိတာကလဲ ရွိတဲ့ Open Source ေတြရဲ႕ အားသာခ်က္ေတြကုိ ေရြးခ်ယ္ၿပီး ေပါင္းစပ္ထားတာပါ။
Event Log forensics ဟာ computer Forensics မွာ အေရးၾကီးတဲ့ အစိတ္အပုိင္းမွာ ပါ၀င္ပါတယ္။ဘယ္လုိ Case ကုိပဲစစ္စစ္ ေနာက္ဆုံး
စစ္ေဆးၿပီး ရလဒ္ေရးသာရာမွာ မပါမျဖစ္တဲ့ ေနရာကေနပါ၀င္ပါတယ္။



Comments

Post a Comment

Popular posts from this blog

NTFS Index Attributes

Image
  NTFS Index Attributes Now that we have described the general concept of B-trees, we need to describe how they are implemented in NTFS to create indexes. Each entry in the tree uses a data structure called an index entry to store the values in each node. There are many types of index entries, but they all have the same standard header fields, which are given in Chapter 13. For example, a directory index entry contains a few header values and a $FILE_NAME attribute. The index entries are organized into nodes of the tree and stored in a list. An empty entry is used to signal the end of the list. Figure 11.18 shows an example of a node in a directory index with four $FILE_NAME index entries. Figure 11.18. A node in an NTFS directory index tree with four index entries. Figure 11.18 The index nodes can be stored in two types of MFT entry attributes. The $INDEX_ROOT attribute is always resident and can store only one node that contains a small number of index entries. The $INDEX_ROOT at...
Read more

B-Trees (NTFS)

Image
  B-Trees An NTFS index sort attributes into a tree, specifically a B-tree. A tree is a group of data structures called nodes that are linked together such that there is a head node and its branches out to the other nodes. Consider Figure 11.13(A), where we see node A on top and it links to nodes B and C. Node B links to nodes D and E. A parent node is one that links to other nodes, and a child node is one that is linked to. For example, A is a parent node to B and C, which are children of A. A leaf node is one that has no links from it. Nodes C, D, and E are leaves. The example shown is a binary tree because there are a maximum of two children per node. Figure 11.13. Examples of A) a tree with 5 nodes and B) the same tree that is sorted by the node values FIG- 11.3 Trees are useful because they can be used to easily sort and find data. Figure 11.13(B) shows the same tree as we saw on the left side, but now with values that are assigned to each node. If we are trying to look up a ...
Read more

eCDFP (Module-6) (Window Forensics) (Part - 1 )

Image
လက်ရှိအချိန်မှာ PC/Laptop သုံးစွဲတဲ့အထဲမှာ Window အသုံးပြုသူက ကမ္ဘာမှာ အများဆုံးဖြစ်ပါတယ်။ Operation System အနေနဲ့ကြည့်မယ်ဆိုရင် ဒုတိယအများဆုံးဖြစ်ပါတယ်၊ ပထမအများဆုံးကတော့ Android ဖြစ်ပါတယ်။ Window 1.0 ကနေ အခုနောက်ဆုံးထွက်တဲ့ Window 11 အထိမှာ လက်ရှိလူတွေ အများဆုံးအသုံးပြုတာကတော့ Window 10/ Window 11 ဖြစ်ပါတယ်။ Forensics Analysis လုပ်မယ်ဆိုရင် Window ကနေရနိုင်တဲ့ Artifact (2) မျိုးရှိပါတယ်။ (1) System Artifacts  (2) User Artifacts  System Artifacts  ကတော့ Window Operation System   ကနေရနိုင်တဲ့ Artifacts တွေဖြစ်ပါတယ်။  System Artifacts Example  Registry Artifacts Event Logs File System Artifacts (Master File Table) Prefetch Files Volume Shadow Copies  User Artifacts ကတော့ User အသုံးပြုတဲ့ Computer ပေါ်မှာ User ကနေအသုံးပြုတဲ့ Activity တွေဖြစ်ပါတယ်။ တစ်ကယ်တန်း Forensics Analysis လုပ်မယ်ဆိုရင် System Artifacts ကိုရော User Artifacts ကိုရော Analysis ပြုလုပ်ပါတယ်။  User Artifacts Example  UserAssist  LNK Files Browser Artifacts...
Read more