85 lines
3.7 KiB
Text
85 lines
3.7 KiB
Text
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rule BernhardPOS {
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meta:
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author = "Nick Hoffman / Jeremy Humble"
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last_update = "2015-07-14"
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source = "Morphick Inc."
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description = "BernhardPOS Credit Card dumping tool"
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reference = "http://morphick.com/blog/2015/7/14/bernhardpos-new-pos-malware-discovered-by-morphick"
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md5 = "e49820ef02ba5308ff84e4c8c12e7c3d"
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strings:
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/*
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33C0 xor eax, eax
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83C014 add eax, 0x14
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83E814 sub eax, 0x14
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64A130000000 mov eax, dword ptr fs:[0x30]
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83C028 add eax, 0x28
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83E828 sub eax, 0x28
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8B400C mov eax, dword ptr [eax + 0xc]
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83C063 add eax, 0x63
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83E863 sub eax, 0x63
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8B4014 mov eax, dword ptr [eax + 0x14]
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83C078 add eax, 0x78
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83E878 sub eax, 0x78
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8B00 mov eax, dword ptr [eax]
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05DF030000 add eax, 0x3df
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2DDF030000 sub eax, 0x3df
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8B00 mov eax, dword ptr [eax]
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83C057 add eax, 0x57
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83E857 sub eax, 0x57
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8B4010 mov eax, dword ptr [eax + 0x10]
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83C063 add eax, 0x63
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*/
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$shellcode_kernel32_with_junk_code = { 33 c0 83 ?? ?? 83 ?? ?? 64 a1 30 00 00 00 83 ?? ?? 83 ?? ?? 8b 40 0c 83 ?? ?? 83 ?? ?? 8b 40 14 83 ?? ?? 83 ?? ?? 8b 00 ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 8b 00 83 ?? ?? 83 ?? ?? 8b 40 10 83 ?? ?? }
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$mutex_name = "OPSEC_BERNHARD"
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$build_path = "C:\\bernhard\\Debug\\bernhard.pdb"
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/*
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55 push ebp
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8BEC mov ebp, esp
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83EC50 sub esp, 0x50
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53 push ebx
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56 push esi
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57 push edi
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A178404100 mov eax, dword ptr [0x414078]
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8945F8 mov dword ptr [ebp - 8], eax
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668B0D7C404100 mov cx, word ptr [0x41407c]
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66894DFC mov word ptr [ebp - 4], cx
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8A157E404100 mov dl, byte ptr [0x41407e]
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8855FE mov byte ptr [ebp - 2], dl
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8D45F8 lea eax, dword ptr [ebp - 8]
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50 push eax
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FF150CB04200 call dword ptr [0x42b00c]
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8945F0 mov dword ptr [ebp - 0x10], eax
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C745F400000000 mov dword ptr [ebp - 0xc], 0
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EB09 jmp 0x412864
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8B45F4 mov eax, dword ptr [ebp - 0xc]
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83C001 add eax, 1
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8945F4 mov dword ptr [ebp - 0xc], eax
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8B4508 mov eax, dword ptr [ebp + 8]
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50 push eax
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FF150CB04200 call dword ptr [0x42b00c]
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3945F4 cmp dword ptr [ebp - 0xc], eax
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7D21 jge 0x412894
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8B4508 mov eax, dword ptr [ebp + 8]
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0345F4 add eax, dword ptr [ebp - 0xc]
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0FBE08 movsx ecx, byte ptr [eax]
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8B45F4 mov eax, dword ptr [ebp - 0xc]
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99 cdq
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F77DF0 idiv dword ptr [ebp - 0x10]
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0FBE5415F8 movsx edx, byte ptr [ebp + edx - 8]
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33CA xor ecx, edx
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8B4508 mov eax, dword ptr [ebp + 8]
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0345F4 add eax, dword ptr [ebp - 0xc]
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8808 mov byte ptr [eax], cl
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EBC7 jmp 0x41285b
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5F pop edi
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5E pop esi
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5B pop ebx
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8BE5 mov esp, ebp
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5D pop ebp
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*/
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$string_decode_routine = { 55 8b ec 83 ec 50 53 56 57 a1 ?? ?? ?? ?? 89 45 f8 66 8b 0d ?? ?? ?? ?? 66 89 4d fc 8a 15 ?? ?? ?? ?? 88 55 fe 8d 45 f8 50 ff ?? ?? ?? ?? ?? 89 45 f0 c7 45 f4 00 00 00 00 ?? ?? 8b 45 f4 83 c0 01 89 45 f4 8b 45 08 50 ff ?? ?? ?? ?? ?? 39 45 f4 ?? ?? 8b 45 08 03 45 f4 0f be 08 8b 45 f4 99 f7 7d f0 0f be 54 15 f8 33 ca 8b 45 08 03 45 f4 88 08 ?? ?? 5f 5e 5b 8b e5 5d }
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condition:
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any of them
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}
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