Snippets
Created by
Alexander Hanel
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | * 636 KB of position independent code injected into a hollowed process
* 76,202,774 instructions logged
* Not one string is present
* Most API calls are Nt*
* 1,200 functions identified by IDA but more likely about 2,000.
- Due to no cross-references IDA didn't identify them. IDAPatchWork found 800 more.
* Calculated function calls and overwriting the return address
Note: assembly is executed code not from a disassembler.
START
009D8513 Main PUSH EAX
009D8514 Main PUSH 5698C631
009D8519 Main PUSH 569A19A1
009D851E Main CALL 009C1A06
009C1A06 Main PUSH EBP
009C1A07 Main MOV EBP,ESP EBP=0007FF00
009C1A09 Main PUSH EAX
;; save off return address
009C1A0A Main MOV EAX,DWORD PTR SS:[EBP+4] EAX=009D8523
009C1A0D Main MOV DWORD PTR SS:[EBP+10],EAX ;; assign return address to [EBP+10]
009C1A10 Main MOV EAX,DWORD PTR SS:[EBP+C] EAX=5698C631 ;; second argument
009C1A13 Main SUB EAX,DWORD PTR SS:[EBP+8] EAX=FFFEAC90 ;; third argument
009C1A16 Main JMP 009E1EA6
009E1EA6 Main ADD DWORD PTR SS:[EBP+4],EAX ;; overwrite return address
009E1EA9 Main POP EAX EAX=00000000
009E1EAA Main LEAVE EBP=0007FFC0
009E1EAB Main RETN 8
END
;; Python
;; hex(ctypes.c_uint32(0x5698C631 - 0x569A19A1 + 0x09D8523).value)
;; 0x9c31b3
009C31B3 Main PUSH EBP
009C31B4 Main MOV EBP,ESP EBP=0007FF0C
* Contains a lot of loops that appear to be junk code but the results are used for decoding.
;; loop that executes 0xF29
009DA4AF Main JE SHORT 009DA4B6
009DA4B1 Main ADD EBX,EDX EBX=0AD50760
009DA4B3 Main DEC ECX ECX=00000F28
009DA4B4 Main JNZ SHORT 009DA4B1
...
009DA4B1 Main ADD EBX,EDX EBX=2932A6C8
009DA4B3 Main DEC ECX ECX=00000000
009DA4B4 Main JNZ SHORT 009DA4B1
;; end of junk decrement code
;; is the calculated value ever used again 2932A6C8?
;; yes, its used as an ROL key at 009BA6D2
009DA4B6 Main MOV ECX,DWORD PTR SS:[EBP-20] ECX=00003CA5
009DA4B9 Main JMP DWORD PTR SS:[EBP-18]
...
009BA6D2 Main MOV EAX,EBX EAX=2932A6C8 ;; calculated value
009BA6D4 Main ROR EAX,CL EAX=C82932A6
009BA6D6 Main INC EDX EDX=00003CA6
009BA6D7 Main MOV DWORD PTR SS:[EBP-10],EDX
009BA6DA Main AND EDX,3 EDX=00000002
009BA6DD Main JNZ SHORT 009BA6E5
009BA6E5 Main XOR AL,BYTE PTR DS:[ESI] EAX=C82932FA
009BA6E7 Main INC ESI ESI=00A4AB86 ;; increment pointer data
009BA6E8 Main MOV BYTE PTR DS:[EDI],AL
009BA6EA Main INC EDI EDI=0007FB8D ;; increment pointer to buffer
* XOR of addresses so no cross-references can be found in memory
009D35C0 Main PUSH EBX
009D35C1 Main MOV EBX,D1C2FB03 EBX=D1C2FB03
009D35C6 Main XOR EAX,EBX EAX=7C90D9E0 ;; 7C90D9E0 = ZwReadVirtualMemory
009D35C8 Main POP EBX EBX=00000000
009D35C9 Main LEAVE EBP=0007FCBC
009D35CA Main RETN
* Then later called via jump but the return address from the API is in ntdll.dll (breaks execute till user code).
009E2AB2 Main PUSH EDI
009E2AB3 Main JMP DWORD PTR SS:[EBP+8]
ZwReadVirtualMemory Main MOV EAX,0BA EAX=000000BA
7C90D9E5 Main MOV EDX,7FFE0300 EDX=7FFE0300
7C90D9EA Main CALL DWORD PTR DS:[EDX]
KiFastSystemCall Main MOV EDX,ESP EDX=0007FB20
7C90E4F2 Main SYSENTER EAX=00000000, ECX=00000001, EDX=FFFFFFFF
7C90D9EC Main RETN 14
7C95EE2D Main CALL EBX
009DEA60 Main CMP DWORD PTR SS:[EBP-CC],EDX
* The only familar thing about the code is the of hashing API names.
009B1A11 Main ROL EBX,7 EBX=AA1AAC47
009B1A14 Main XOR BL,AL EBX=AA1AAC22 ;; ZwCreateFile
009B1A16 Main INC ESI ESI=7C90B772
009B1A17 Main DEC EDI EDI=00000000
009B1A18 Main JNZ 009EA766
009B1A1E Main MOV EAX,EBX EAX=AA1AAC22
009B1A20 Main POP ESI ESI=7C90B766
009B1A21 Main POP EBX EBX=7C903400
009B1A22 Main POP EDI EDI=7C905744
009B1A23 Main LEAVE EBP=0007F52C
009B1A24 Main RETN 8
|
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