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429
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|---|
Table 01 are for illustration purpose only)
|
Client Command
|
Reference (DWORD)
|
00 00 00 00
|
Task
|
(DWORD)
|
Start / End
|
Size of Data
|
Flag (DWORD) sent (DWORD)
|
02 00 00 00 01 00 00 00 B0 00 00 00
|
Data
|
Data
|
Encryption Key
|
(WORD)
|
(WORD)
|
75 53
|
A1 00
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[Table 01 - Client
|
s Information Header Format]
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The client
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s Command Reference and Task will be discussed in the section
|
Backdoor Command
|
Reference
|
. It is important to take note that the information from the server is encrypted using a
|
bitwise NOT, while the information from the client is encrypted using a bitwise XOR with 0xCC as
|
the key. (see Listing 12)
|
Fields
|
Offset
|
Description
|
Client Command Reference
|
0x00
|
This field is a reference used for identifying the
|
group of a specific backdoor command.
|
Task
|
0x04
|
This field contains the code used to identify which
|
backdoor instruction to execute.
|
Start / End
|
0x08
|
This field is a flag that signals the receiver start (1)
|
or end (-1) of data.
|
CA ISBU-ISI WHITE PAPER: IN-DEPTH ANALYSIS OF HYDRAQ
|
Fields
|
Offset
|
Description
|
Data Size
|
0x0C
|
This field contains the size of the encrypted data
|
included in transmission.
|
Data CRC
|
0x10
|
A CRC value computed based on the encrypted
|
data. This field is used for integrity checking of the
|
encrypted data.
|
Data Encryption
|
0x12
|
It is a word value used as the decryption key for
|
the encrypted data. This field is used to preserve
|
the confidentiality of the encrypted data.
|
Encrypted Data
|
0x14
|
This offset contains the encrypted data being
|
transmitted to the client or server.
|
[Table 02 - Information Header Definition]
|
3.5.2 Server
|
s Information Header Format
|
[Figure 02 - The client process the server information header.]
|
The constructed information header is 20 bytes in size with the following format. (Note: The values
|
in Table 03 are for illustration purpose)
|
Server Information
|
Reference (DWORD)
|
00 00 00 00
|
Server
|
Information
|
Code
|
(DWORD)
|
Start / End
|
Size of Data
|
Flag (DWORD) sent (DWORD)
|
02 00 00 00 01 00 00 00 B0 00 00 00
|
Data
|
Data
|
Encryption Key
|
(WORD)
|
(WORD)
|
75 53
|
A1 00
|
[Table 03 - Server's Information Header Format]
|
The difference between the client and server header information is the Server Info Reference (offset 0x00) and Information Code (offset 0x04). Based on our simulation and code inspection, the
|
backdoor client uses the following numeric codes to identify the content of the received information: (Note: The Backdoor Command and Task is discussed in section Backdoor Command Table)
|
CA ISBU-ISI WHITE PAPER: IN-DEPTH ANALYSIS OF HYDRAQ
|
Server
|
Information
|
Reference
|
Server
|
Backdoor
|
Information Code
|
Task
|
(expected values) Command
|
Type of Information
|
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