Physical memory forensics system and method
View Patent ↗The method of the present inventive concept is configured to utilize Operating System data structures related to memory-mapped binaries to reconstruct processes. These structures provide a system configured to facilitate the acquisition of data that traditional memory analysis tools fail to identify, including by providing a system configured to traverse a virtual address descriptor, determine a pointer to a control area, traverse a PPTE array, copy binary data identified in the PPTE array, generate markers to determine whether the binary data is compromised, and utilize the binary data to reconstruct a process.
1. A method to determine whether a computer system has been compromised, the method comprising the steps of:
traversing a virtual address descriptor to acquire process data;
reconstructing mapped data based on the acquired process data;
storing the mapped data via a memory of a system, and
traversing a virtual address control block to recover a file from a memory cache if (i) a page table entry is invalid, and (ii) a valid data length related to the file is not determined to be greater than a size of the file,
wherein,
the mapped data is obtained when a virtual address causes a page fault, and
the page fault triggers the system to execute a process to automatically acquire the mapped data.
2. The method of claim 1 , wherein the traversing the virtual address descriptor includes (i) traversing at least one descendant lineage to a terminal node using at least one pointer and at least one node, and (ii) retrieving data associated with the at least one node.
3. The method of claim 2 , wherein the pointer is a SECTION_OBJECT_POINTER structure having (i) a first pointer named ImageSectionObject, (ii) a second pointer named DataSectionObject, and (iii) a third pointer named SharedCacheMap.
4. The method of claim 1 , further comprising the step of:
generating, via a processor of the system, at least one marker based on the mapped data.
5. The method of claim 4 , wherein the marker is a set of hashes.
6. The method of claim 4 , further comprising the step of:
comparing, vit the processor, the at least one marker to another marker to determine whether a compromise exists within the system.
7. The method of claim 6 , wherein the another marker is based on binary data of known uncompromised data.
8. The method of claim 7 , wherein the another marker is a set of hashes.
9. The method of claim 6 , further comprising the step of:
determining whether the mapped data is compromised based on the comparison.
10. The method of claim 1 , further comprising the step of:
executing a hashing process to produce a plurality of hash values based on the mapped data;
comparing the plurality of hash values with a set of control values and producing a result; and
determining whether the mapped data is compromised based on the result.
11. A method of reconstructing a process using a computer system, the method comprising the steps of:
traversing a virtual address descriptor to acquire process data;
reconstructing mapped data based on the acquired process data;
storing the mapped data via a memory of the computer system, and
traversing a virtual address control block to recover a file from a memory cache if (i) a page table entry is invalid, and (ii) a valid data length related to the file is not determined to be greater than a size of the file,
wherein,
the mapped data is obtained when a virtual address causes a page fault, and
the page fault triggers the computer system to execute a process to automatically acquire the mapped data.
12. The method of claim 11 , wherein the traversing the virtual address descriptor includes (i) traversing at least one descendant lineage to a terminal node using at least one pointer and at least one node, and (ii) retrieving data associated with the at least one node.
13. The method of claim 12 , wherein the pointer is a SECTION_OBJECT_POINTER structure having (i) a first pointer named ImageSectionObject, (ii) a second pointer named DataSectionObject, and (iii) a third pointer named SharedCacheMap.
14. The method of claim 11 , further comprising the step of:
generating, via a processor, at least one marker based on the mapped data,
wherein,
the marker is a set of hashes.
15. The method of claim 14 , further comprising the step of:
comparing, via the processor, the at least one marker to another marker to determine whether a compromise exists,
wherein the another marker is based on binary data of known uncompromised data.
16. The method of claim 15 , wherein the another marker is a set of hashes.
17. The method of claim 15 , further comprising the step of:
determining whether the mapped data is compromised based on the comparison.
18. The method of claim 11 , further comprising the step of:
executing a hashing process to produce a plurality of hash values based on the mapped data;
comparing the plurality of hash values with a set of control values and producing a result; and
determining whether the mapped data is compromised based on the result.