Digital Forensics Flow

Digital Forensics Flow

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SQLite Database Forensics (Note)

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  SQLite ကို Android Phone, Apple Phone , MAC OS, Window တို့မှာ အချို့ Application တွေရဲ့ Data တွေကို  သိမ်းဆည်းဖို့ အများဆုံးအသုံးပြုပါတယ်။  Message Application တွေဖြစ်တဲ့ Viber, Telegram, What App , Skype,  Messenger စတဲ့ Message Application တွေက Desktop Version ပဲဖြစ်ဖြစ် Mobile Version ပဲ ဖြစ်ဖြစ် SQLite Database ကို အသုံးပြုပါတယ်။  ဒါ့အပြင် Contact, Call Log , Message (SMS)  စတာတွေမှာ SQLite Database ကို အသုံးပြုပါတယ်။ Window ဆိုရင်လဲ Browser တွေရဲ့ History  , Window Timeline History ကိုသိမ်းဆည်းတဲ့နေရာ Mac OS ဆိုရင်လဲ အဓိကကျတဲ့ Artifacts တွေကို သိမ်းဆည်းတဲ့နေရာမှာအများဆုံးအသုံးပြုပါတယ်။  SQLite မှာ Journal File 2 File ရှိပါတယ်။ Journal File  Write-Ahead Log (WAL) File   Journal File  Database မှာ ရှိတဲ့ Data တွေကို Page အနေနဲ့ သိမ်းထားပြီး Page Size က‌တော့ Developer သတ်မှတ်တဲ့ အတိုင်းရှိပါတယ်။ Default ကတော့ 4096 Bytes ဖြစ်ပါတယ်။ Database တစ်ခုထဲမှာ ရှိတဲ့ Page File တွေက Same Size ဖြစ်ပါတယ်။ Page-1 က 4096 Bytes ဆိုရင် ကျန်တဲ့ Page တွေကလဲ 4096 Bytes ပဲဖြစ်ပါတယ်။ Database ထဲမှာ Pag
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B-Trees (NTFS)

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  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
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NTFS Index Attributes

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  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
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