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Listing 8.5 A random string-generation function.
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0040151C 0040151E 00401523 00401526 0040152B 0040152C 0040152E 00401531 00401534 00401535 00401537 00401539 0040153C 00401540 00401541 00401542 00401543 00401544
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JMP SHORT ZoneLock.00401535 CALL <JMP.&CRTDLL.rand> MOV EDI,DWORD PTR SS:[EBP+8] MOV ECX,1A CDQ IDIV ECX ADD EDX,61 MOV BYTE PTR DS:[EDI+ESI],DL INC ESI CMP ESI,EBX JLE SHORT ZoneLock.0040151E MOV EAX,DWORD PTR SS:[EBP+8] MOV BYTE PTR DS:[EAX+ESI],0 POP EDI POP ESI POP EBX POP EBP RETN
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Listing 8.5 A random string-generation function.
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This generates some kind of random data (with the random seed taken from the current tick counter). The buffer length is somewhat random; the default length is 5 bytes, but it can go to anywhere from 2 to 8 bytes, depending on whether rand produces a negative or positive integer. Once the primary loop is entered, the function computes a random number for each byte, calculates a modulo 0x1A (26 in decimal) for each random number, adds 0x61 (97 in decimal), and stores the result in the current byte in the buffer. Observing the resulting buffer in OllyDbg exposes that the program is essentially producing a short random string that is made up of lowercase letters, and that the string is placed inside the caller-supplied buffer.
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Notice how the modulo in Listing 8.5 is computed using the highly ineffiecient IDIV instruction. This indicates that the Trojan was compiled with some kind of Minimize Size compiler option (assuming that it was written in a high-level language). If the compiler was aiming at generating high-performance code, it would have used reciprocal multiplication to compute the modulo, which would have produced far longer, yet faster code. This is not surprising considering that the program originally came packed with UPX the author of this program was clearly aiming at making the executable as tiny as possible. For more information on how to identify optimized division sequences and other common arithmetic operations, refer to Appendix B.
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The next sequence takes the random string and produces a string that is later sent to the IRC server. Let s take a look at that code.
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00402ABB 00402ABC 00402AC1 00402AC7 00402AC8 00402ACD 00402AD2 00402AD8 00402AD9 PUSH EAX ; PUSH ZoneLock.0040519E ; LEA EAX,DWORD PTR SS:[EBP-204] PUSH EAX ; PUSH ZoneLock.00405199 ; PUSH ZoneLock.004054C5 ; <%s> <%s> = USER <%s> <%s> = NICK format = %s %s %s %s x.com x :x
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LEA EAX,DWORD PTR SS:[EBP-508] PUSH EAX ; s CALL <JMP.&CRTDLL.sprintf>
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Considering that EAX contains the address of the randomly generated string, you should now know exactly what that string is for: it is the user name the backdoor will be using when connecting to the server. The preceding sequence produced the following message, and will always produce the same message the only difference is going to be the randomly generated name string.
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NICK vsorpy USER vsorpy x.com x :x
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If you look at RFC 1459, the IRC protocol specifications, you can see that this string means that a new user called vsorpy is being registered with the server. This username is going to represent this particular system in the IRC chat. The random-naming scheme was probably created in order to enable multiple clients to connect to the same server without conflicts. The architecture actually supports convenient communication with multiple infected systems at the same time.
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After connecting to the IRC server, the program and the IRC server enter into a brief round of standard IRC protocol communications that is just typical protocol handshaking. The next important even takes place when the IRC server notifies the client whether or not the server has a MOTD (Message of the Day) set up. Based on this information, the program enters into the code sequence that follows, which decides how to enter into the communications channels inside which the attacker will be communicating with the Backdoor.
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00402D80 00402D82 00402D87 00402D8C 00402D91 JBE SHORT ZoneLock.00402DA7 PUSH ZoneLock.004050B6 PUSH ZoneLock.004050B0 PUSH ZoneLock.004051A3 PUSH ZoneLock.004054AC ; ; ; ; <%s> = <%s> = <%s> = format grandad ##g## JOIN = %s %s %s
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