NTFS File System timestamp Forensics
Part 1
NTFS file system ထဲမွာ Master File Table (MFT)ပါ၀င္ပါတယ္။ HardDisk အေၾကာင္းေရးသားတုန္းက MFT ထဲမွာ Hard Disk ရဲ႕ ဘယ္ Cluster ဘယ္ေလာက္မွာေတာ့ file ,folder နဲ႔ပတ္သတ္တဲ့ အခ်က္အလက္ေတြ ကုိ သိမ္းထားပါတယ္ဆုိၿပီး ေဖာ္ၿပခဲ့ပါတယ္။MFT မွာ ေနာက္ထပ္သိမ္းထားတာကေတာ့ MFT ရဲ႕ $STANDARD_INFO ထဲမွာ
Modified Time (M-time)
Accessed Time (A-time)
Created Time (C-time)
Changed ($MFT မွာ Modifiedလုပ္တဲ့အခ်ိန္ )
(သာမန္အေနအထားျဖင့္ User မျမင္ႏုိင္)
ဆုိၿပီး 4 ခုရွိပါတယ္။ အေပၚ 3 ခုျဖစ္တဲ့ Modified Time (M-time) Accessed Time (A-time) Created Time (C-time) ကေတာ့ user ကၾကည့္လုိ႕ရပါတယ္။ Changed ($MFT Modified) ကုိေတာ့ Forensics tools ေတြ MFT viewer tools ေတြနဲ႕ၾကည့္လုိ့ရပါတယ္။ example autopsy,Encase,FTK,
$FILE_NAME မွာေတာ့ file, folder ေတြရဲဲအမည္ကုိ မွတ္သားထားပါတယ္။
ဒါဆုိရင္ file တစ္ခု folder တစ္ခုကုိၾကည့္တာနဲ ဘယ္အခ်ိန္မွာ Create လုပ္တယ္ဘယ္အခ်ိန္မွာ modified (edit) လုပ္တယ္ ဘယ္အခ်ိန္မွာ access လုပ္တယ္ဆုိတဲ့ MAC time ကုိသိႏုိင္ပါတယ္။ Antiforensics အေနနဲ႕ time stamp ကုိၿပင္ ႏုိင္ပါတယ္။ file folder ေတြကုိ တစ္ခုခ်င္းစီအလုိက္ ၿပင္သလုိ file folder အားလုံကုိ random ခ်ၿပီး timeေတြအကုန္ေၿပာင္း လုိက္တာလဲျဖစ္ႏုိင္ ပါတယ္။ Example timestomp
timestamp ကုိစစ္ေဆးတဲ့အခါ သာမန္စစ္ေဆးတဲ့အေနအထားမွာေရာ timestamp (antiforensics) ျဖစ္တဲ့အခါမွာေရာ စဥ္းစားရမည့္အခ်က္ေတြကေတာ့
W5 ေမးခြန္းပဲျဖစ္ပါတယ္။
what ? File ကဘာအမ်ဳိးအစားလဲ
Where? File က ဘယ္ေနရာမွာရွိတာလဲ
Why ? file ကဘာလုိ႕ ဒီေနရာမွာရွိေနရတာလဲ
How ? ဘယ္လုိေရာက္လာတာလဲ
Who? ဘယ္သူက လာထားတာလဲ
text file ကုိစမ္းသပ္ထားရာမွာေတာ့
win 10 မွာ hello.txt ကုိ time zone မတူတဲ့ ကြန္ပ်ဴတာ w7 မွာေၿပာင္းလုိက္တဲ့ အေနအထားကေတာ့ေျပာင္လဲမႈရွိတာကုိေတြ႕ရမွာျဖစ္ပါတယ္။

MCAB  time 



window 10 တြင္ txt file create  လုပ္ထားျခင္း




W10 မွ window 7သုိ႕ txt file ေၿပာင္းထားလုိက္ေသာအခါ


Comments

Post a Comment

Popular posts from this blog

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 valu
Read more

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 attrib
Read more

Volatility Workbench (GUI) for the Volatility tool

Image
 Memory Dump ကနေ Artifacts တွေကို ရယူနိုင်ဖို့ Volatility (Command Line) ကို တော်တော်များများ အသုံးပြုကြပါတယ်။ Pass Mark OS Forensics ကနေ GUI မသုံးချင်သူတွေ / နှစ်မျိုးလုံး အသုံးပြုချင်သူတွေအတွက် Volatility Workbench (GUI) ကိုပြုလုပ်ထားပါတယ်။ တွဲပြီးအသုံးပြုရမဲ့ Profile တွေကိုလဲ အသင့် Download ရယူနိုင်ပါတယ်။ Sample File တွေလဲပေးထားပါတယ်။ Open Source Computer Forensics Tool ဖြစ်တဲ့ Autopsy အပြင် Commercial Computer Forensics Tools တွေကလဲ လက်ရှိအချိန်ထိ Open Source ဖြစ်တဲ့ Volatility ကိုပဲ သူတို့ရဲ့ Software ထဲမှာ အသုံးပြုထားပါတယ်။                                                           Link  Volatility Workbench (GUI) for the Volatility tool
Read more