CN103019740A - Method and device for obtaining import table and relocation table - Google Patents
Method and device for obtaining import table and relocation table Download PDFInfo
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- CN103019740A CN103019740A CN2012105877222A CN201210587722A CN103019740A CN 103019740 A CN103019740 A CN 103019740A CN 2012105877222 A CN2012105877222 A CN 2012105877222A CN 201210587722 A CN201210587722 A CN 201210587722A CN 103019740 A CN103019740 A CN 103019740A
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Abstract
The invention discloses a method and device for obtaining an import table and a relocation table. The method comprises the steps as follows: recording data rewriting information generated in the process of running a packing program, wherein the data rewriting information comprises data rewriting addresses, rewritten data and data rewriting time; determining an original entry point (OEP) of an original program corresponding to the packing program and combining the rewritten data corresponding to the data rewriting information with the continuous data rewriting time and the continuous data rewriting addresses in the recorded data rewriting information; and/or, combining the rewritten data corresponding to the data rewriting information with the continuous data rewriting time and the at least two continuous data rewriting addresses in the recorded data rewriting information; and analyzing the combined rewritten data one by one to obtain the import table and the relocation table of the original program corresponding to the packing program. According to the scheme, the time consumption is reduced and the efficiency is improved.
Description
Technical field
The present invention relates to field of computer technology, espespecially a kind of method and device that obtains importing table and relocation table
Background technology
Adding shell is the abbreviation that the executable program resource is processed, and is the conventional means of protection executable program, and its principle is to utilize particular algorithm, and the resource in the executable program is compressed, encrypted.Cryptor can directly move on equipment, but can not obtain original program, just can obtain through shelling.The process of shelling mainly is divided into following three steps: the first step, determine the entrance (Original Entry Point, OEP) of original program; Second step is repaired and is imported table and relocation table; In the 3rd step, with the original program writing in files in the internal memory, the new entry address of change program is OEP, and this step is commonly referred to dump (Dump).
Adding for program in the process of shell, sometimes do not destroy importing table and the relocation table of original program fully, like this in the process of operation cryptor, the importing table of original program and the relocation table complete reproduction of meeting or part are reappeared in the data of internal memory record, for example, the data of importing table comprise A1, A2, A3, constantly will import the data A1 write memory address x of table at T1, constantly will import the data A2 write memory address x+d1 of table at T2, constantly import the data A3 write memory address x+d2 of table at T3, A1, A2, A3 also can be called three kinds of internal storage states, rewrite data A1A2A3 is made up just can obtain whole importing table so.As seen, the cryptor that is not destroyed fully for importing table and relocation table, the all data rewriting information that in getting access to the cryptor operational process, produces, and determine the OEP of the original program that cryptor is corresponding after, if energy may make up reduction with all internal storage states, just can obtain importing table and relocation table in the internal storage state after these combinations.
After the data rewriting information that in the cryptor operational process that gets access to, produces, thereby obtain importing table and relocation table for the ease of analyzing data rewriting information, can be with the data rewriting information recording/in a form, the data rewriting information recording/of supposing to obtain is in such as following table, wherein x, x+d1, x+d2 represent the data rewriting address, T1, T2, T3 represent the data rewriting time, A1, A2, A3, B1, B2, B3, C1, C2, C3 represent rewrite data, so, can draw the combination of rewrite data among the 3*3*3=27 according to the data rewriting information of obtaining.
| Memory address/time | T1 | T2 | T3 |
| x | A1 | A2 | A3 |
| x+d1 | B1 | B2 | B3 |
| x+d2 | C1 | C2 | C3 |
Only show at T1 in the upper table, T2, these three moment of T3, memory address x, x+d1, the situation of x+d2 data writing, at this moment will obtain the combination of 27 kinds of rewrite data, behind cryptor of actual motion, may obtain a large amount of data rewriting information, a memory address also may occur and be recycled rewriting situation repeatedly, the quantity that obtains like this rewrite data also is huge, then a large amount of rewrite data is made up, will obtain the combination of very many rewrite data, then obtaining one by one importing table and relocation table in the combination of the rewrite data that obtains will be very consuming time, and efficient is also very low.
Summary of the invention
The embodiment of the invention provides a kind of method and device that obtains importing table and relocation table, in order to solve in the prior art when obtaining the importing table that do not destroyed fully and relocation table length consuming time, inefficient problem.
A kind of method of obtaining importing table and relocation table comprises:
The data rewriting information that produces in the record operation cryptor process, described data rewriting information comprises data rewriting address, rewrite data and data rewriting time;
Behind the entrance OEP that determines the original program that described cryptor is corresponding, in the data rewriting information of record, the continuous corresponding rewrite data of data rewriting information of data rewriting Time Continuous and data rewriting address is made up; And/or, in the data rewriting information of record, the corresponding rewrite data of data rewriting information of data rewriting Time Continuous, at least two continuous data rewriting address cycle is made up;
Rewrite data after the analysis combination is obtained importing table and the relocation table of original program corresponding to described cryptor one by one.
A kind of device that obtains importing table and relocation table comprises:
Record cell is used for the data rewriting information that record operation cryptor process produces, and described data rewriting information comprises data rewriting address, rewrite data and data rewriting time;
Assembled unit is used in the data rewriting information of record, the continuous corresponding rewrite data of data rewriting information of data rewriting Time Continuous and data rewriting address being made up behind the entrance OEP that determines the original program that described cryptor is corresponding; And/or, in the data rewriting information of record, the corresponding rewrite data of data rewriting information of data rewriting Time Continuous, at least two continuous data rewriting address cycle is made up;
Acquiring unit is used for analyzing one by one importing table and relocation table that rewrite data after the combination is obtained original program corresponding to described cryptor.
Beneficial effect of the present invention is as follows:
The method of obtaining importing table and relocation table and device that the embodiment of the invention provides, by the data rewriting information that produces in the record operation cryptor process, described data rewriting information comprises data rewriting address, rewrite data and data rewriting time; Behind the OEP that determines the original program that described cryptor is corresponding, in the data rewriting information with record, the continuous corresponding rewrite data of data rewriting information in data rewriting Time Continuous and data rewriting address makes up; And/or in the data rewriting information with record, the corresponding rewrite data of data rewriting information of data rewriting Time Continuous, at least two continuous data rewriting address cycle makes up; Rewrite data after the analysis combination is obtained importing table and the relocation table of original program corresponding to described cryptor one by one.Just with in the data rewriting information that records, the continuous corresponding rewrite data of data rewriting information in data rewriting Time Continuous and data rewriting address makes up this scheme; And/or, in the data rewriting information with record, the corresponding rewrite data of data rewriting information of data rewriting Time Continuous, at least two continuous data rewriting address cycle makes up, then the rewrite data of analyzing after making up is one by one obtained the importing table and is reset table, with respect to the mode of in the combination of all possible rewrite data, obtaining importing table and relocation table in the prior art, reduced consuming timely, improved efficient.
Description of drawings
Fig. 1 is the process flow diagram that the first is obtained the method for importing table and relocation table in the embodiment of the invention;
Fig. 2 is the process flow diagram that the second obtains the method for importing table and relocation table in the embodiment of the invention;
Fig. 3 is the third process flow diagram that obtains the method for importing table and relocation table in the embodiment of the invention;
Fig. 4 is the structural representation that obtains the device of importing table and relocation table in the embodiment of the invention;
Fig. 5 is a kind of structural representation that preferably obtains the device of importing table and relocation table in the embodiment of the invention.
Embodiment
For in the prior art when obtaining the importing table that do not destroyed fully and relocation table, length consuming time, inefficient problem, the embodiment of the invention provides three kinds of methods of obtaining importing table and relocation table, the flow process of first method as shown in Figure 1, execution in step is as follows:
S10: the data rewriting information that produces in the record operation cryptor process, data rewriting information comprises data rewriting address, rewrite data and data rewriting time.
Can use the operation cryptors such as virtual machine or debugger, and the data rewriting information that produces in the record operational process.
S11: behind the OEP that determines the original program that cryptor is corresponding, in the data rewriting information of record, the continuous corresponding rewrite data of data rewriting information of data rewriting Time Continuous and data rewriting address is made up.
In the cryptor operational process, can produce a large amount of data rewriting information, these data rewriting information are correlated with a bit, contributive for obtaining importing table and relocation table, some then disperses, can contribution not arranged to obtaining importing table and relocation table, because the importing table tends to appear in the memory address that continuous bulk rewritten, therefore, it is continuous to obtain data rewriting information, and the data rewriting information that the data rewriting address is continuous, after the combination of the rewrite data in these data rewriting information, just can greatly reduce the possibility of all rewrite data combinations, thereby can improve the efficient of obtaining importing table and relocation table.
The below illustrates with two instantiations:
Example one: the data rewriting information at T1, T2, T3, T4, these six continuous moment records of T5, T6 is as shown in the table, and A1, A2, A3, B1, B2, B3 are illustrated in the data that corresponding memory address is write:
| Memory address/time | T1 | T2 | T3 | T4 | T5 | T6 |
| x | A1 | ? | ? | A2 | ? | ? |
| x+d1 | ? | B1 | ? | ? | B2 | ? |
| x+d2 | ? | ? | C1 | ? | ? | C2 |
As can be seen from the above table, the combination of total 2*2*2=8 kind rewrite data, but because T1-T3 is continuous, and x-x+d2 also is continuous, this also just can be seen as a kind of combination of rewrite data, i.e. A1B1C1; In like manner, because T4-T6 is continuous, x-x+d2 also is continuous, also just can be seen as a kind of combination of rewrite data, i.e. A2B2C2.That is to say that in fact above-mentioned six data information of rewriting be the combination of two kinds of rewrite data.So just can reduce the quantity of the combination of rewrite data.
Example two: at T1, T2, T3 ... the data rewriting information that TN records during this period of time is as shown in the table, A1, B1 ... BN, C1 are illustrated in the data that corresponding memory address writes:
| Memory address/time | T1 | T2 | T3 | ? | TN | Remarks |
| x | A1 | ? | ? | ? | A1 | All the time do not rewritten |
| x+d1 | B1 | B2 | B3 | ? | BN | A circulation is write repeatedly |
| x+d2 | C1 | ? | ? | ? | ? | All the time do not rewritten |
In the data rewriting address of record, can rewrite a lot of scattered data rewriting addresses, can not consider the combination of the rewrite data that these rewritings form, above-mentioned 3N bar data are rewritten the combination that in fact information only have a kind of rewrite data: A1+B1+C1.
S12: the rewrite data after the analysis combination is obtained importing table and the relocation table of original program corresponding to cryptor one by one.
After determining the combination of rewrite data of the possible existence of importing table and relocation table, directly analyze one by one the rewrite data after these combinations, then just obtain importing table and relocation table.
This scheme is just with in the data rewriting information that records, the continuous corresponding rewrite data of data rewriting information in data rewriting Time Continuous and data rewriting address makes up, then the rewrite data of analyzing after making up is one by one obtained the importing table and is reset table, with respect to the mode of in the combination of all possible rewrite data, obtaining importing table and relocation table in the prior art, reduced consuming timely, improved efficient.
The method that the second obtains importing table and relocation table as shown in Figure 2, execution in step is as follows:
S20: the data rewriting information that produces in the record operation cryptor process, data rewriting information comprises data rewriting address, rewrite data and data rewriting time.
S21: behind the OEP that determines the original program that cryptor is corresponding, in the data rewriting information of record, the corresponding rewrite data of data rewriting information of data rewriting Time Continuous, at least two continuous data rewriting address cycle is made up.
In the cryptor operational process, can produce a large amount of data rewriting information, these data rewriting information are correlated with a bit, contributive for obtaining importing table and relocation table, some then disperses, can contribution not arranged to obtaining importing table and relocation table, because the importing table tends to appear in the address that continuous bulk rewritten, therefore, it is continuous to obtain data rewriting information, after the corresponding rewrite data of data rewriting information of at least two continuous data rewriting address cycle makes up, just can greatly reduce the possibility of all rewrite data combinations, thereby can improve the efficient of obtaining importing table and relocation table.
The below illustrates with two instantiations:
Example one: the data rewriting information at T1, T2, these four continuous moment records of T3, T4 is as shown in the table, and E1T1, E2T2, E1T3, E2T4 are illustrated in the data that corresponding memory address is write:
As can be seen from the above table, the combination of total 2*2=4 kind rewrite data, but because in these four continuous moment of T1-T4, E1 rewrites the d1 executing data first, then E2 is rewriting the d1 executing data, then E1 rewrites the d2 executing data again, then E2 is rewriting the d2 executing data, and this just can regard a circulation as, so in this time period of T1-T4, the combination of rewrite data only has two kinds: E1T1E1T3 and E2T1E2T4, so just can reduce the quantity that rewrite data makes up.
Example two: the data rewriting information at T1, T2, these four continuous moment records of T3, T4 is as shown in the table, and E1T1, E2T2, E1T3, E2T4 are illustrated in the data that corresponding memory address is write:
As can be seen from the above table, the combination of total 2*2=4 kind rewrite data, but because in these four continuous moment of T1-T4, E1 carries out data rewriting twice to d1 first, therefore then E2 carries out data rewriting twice to d2 again, and this just can regard a circulation as, in this time period of T1-T4, the combination of rewrite data only has two kinds: E1T1E2T3 and E1T2E2T4, so just can reduce the quantity that rewrite data makes up.
S22: the rewrite data after the analysis combination is obtained importing table and the relocation table of original program corresponding to cryptor one by one.
This scheme is just with in the data rewriting information that records, the corresponding rewrite data of data rewriting information of data rewriting Time Continuous, at least two continuous data rewriting address cycle makes up, then the rewrite data of analyzing after making up is one by one obtained the importing table and is reset table, with respect to the mode of in the combination of all possible rewrite data, obtaining importing table and relocation table in the prior art, reduced consuming timely, improved efficient.
The third method of obtaining importing table and relocation table as shown in Figure 3, execution in step is as follows:
S30: the data rewriting information that produces in the record operation cryptor process, data rewriting information comprises data rewriting address, rewrite data and data rewriting time.
S31: behind the OEP that determines the original program that cryptor is corresponding, in the data rewriting information of record, the continuous corresponding rewrite data of data rewriting information of data rewriting Time Continuous and data rewriting address is made up.
This step is identical with S11.
S32: behind the OEP that determines the original program that cryptor is corresponding, in the data rewriting information of record, the corresponding rewrite data of data rewriting information of data rewriting Time Continuous, at least two continuous data rewriting address cycle is made up.
This step is identical with S21.
S33: the rewrite data after the analysis combination is obtained importing table and the relocation table of original program corresponding to cryptor one by one.
Can at first carry out S31, carry out S32; Also can at first carry out S32, carry out S31; Can also carry out simultaneously S31 and S32.
This scheme just in the data rewriting information of record, makes up the continuous corresponding rewrite data of data rewriting information of data rewriting Time Continuous and data rewriting address; And/or, in the data rewriting information of record, the corresponding rewrite data of data rewriting information of data rewriting Time Continuous, at least two continuous data rewriting address cycle is made up, then the rewrite data of analyzing after making up is one by one obtained the importing table and is reset table, with respect to the mode of in the combination of all possible rewrite data, obtaining importing table and relocation table in the prior art, reduced consuming timely, improved efficient.
Better, after above-mentioned S11, S21 and the S32, also comprise: for the rewrite data after the combination is added number information, and add in the formation to be analyzed.
After rewrite data made up, can add upper number information 1,2,3 ..., then add in the formation to be analyzed, queue for storing to be analyzed be the combination of rewrite data to be analyzed.
Concrete, rewrite data after the one by one analysis combination among above-mentioned S12, S22 and the S33 is obtained importing table and the relocation table of original program corresponding to cryptor, specifically comprise: from formation to be analyzed, take out one by one rewrite data and analysis after making up, obtain importing table and the relocation table to be selected of cryptor.
Can from formation to be analyzed, obtain one by one importing table and the relocation table that rewrite data after the combination is obtained original program corresponding to cryptor according to the number order of rewrite data after the combination.The process of analyzing can adopt the method for prior art, repeats no more here.
Based on same inventive concept, the embodiment of the invention provides a kind of device that obtains importing table and relocation table, and the structure of this device comprises as shown in Figure 4:
Acquiring unit 42 is used for analyzing one by one importing table and relocation table that rewrite data after the combination is obtained original program corresponding to cryptor.
Better, the above-mentioned device that obtains importing table and relocation table as shown in Figure 5, also comprises adding device 43, is used for: for the rewrite data after the combination is added number information, and add in the formation to be analyzed.
Better, above-mentioned acquiring unit 42 specifically is used for: the rewrite data of taking out after making up from formation to be analyzed is one by one also analyzed, and obtains importing table and the relocation table to be selected of cryptor.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1. a method of obtaining importing table and relocation table is characterized in that, comprising:
The data rewriting information that produces in the record operation cryptor process, described data rewriting information comprises data rewriting address, rewrite data and data rewriting time;
Behind the entrance OEP that determines the original program that described cryptor is corresponding, in the data rewriting information of record, the continuous corresponding rewrite data of data rewriting information of data rewriting Time Continuous and data rewriting address is made up; And/or, in the data rewriting information of record, the corresponding rewrite data of data rewriting information of data rewriting Time Continuous, at least two continuous data rewriting address cycle is made up;
Rewrite data after the analysis combination is obtained importing table and the relocation table of original program corresponding to described cryptor one by one.
2. the method for claim 1 is characterized in that, also comprises:
For the rewrite data after the combination is added number information, and add in the formation to be analyzed.
3. method as claimed in claim 2 is characterized in that, the rewrite data after the analysis combination is obtained importing table and the relocation table of original program corresponding to described cryptor one by one, specifically comprises:
From described formation to be analyzed, take out one by one rewrite data and analysis after making up, obtain importing table and the relocation table to be selected of described cryptor.
4. a device that obtains importing table and relocation table is characterized in that, comprising:
Record cell is used for the data rewriting information that record operation cryptor process produces, and described data rewriting information comprises data rewriting address, rewrite data and data rewriting time;
Assembled unit is used in the data rewriting information of record, the continuous corresponding rewrite data of data rewriting information of data rewriting Time Continuous and data rewriting address being made up behind the entrance OEP that determines the original program that described cryptor is corresponding; And/or, in the data rewriting information of record, the corresponding rewrite data of data rewriting information of data rewriting Time Continuous, at least two continuous data rewriting address cycle is made up;
Acquiring unit is used for analyzing one by one importing table and relocation table that rewrite data after the combination is obtained original program corresponding to described cryptor.
5. device as claimed in claim 4 is characterized in that, also comprises being used for adding device:
For the rewrite data after the combination is added number information, and add in the formation to be analyzed.
6. device as claimed in claim 5 is characterized in that, described acquiring unit specifically is used for:
From described formation to be analyzed, take out one by one rewrite data and analysis after making up, obtain importing table and the relocation table to be selected of described cryptor.
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