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rule win_xfscashncr_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.xfscashncr." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xfscashncr" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 753b 8b4df8 e8???????? b901000000 6bc9ff 03c1 } // n = 6, score = 100 // 753b | jne 0x3d // 8b4df8 | mov ecx, dword ptr [ebp - 8] // e8???????? | // b901000000 | mov ecx, 1 // 6bc9ff | imul ecx, ecx, -1 // 03c1 | add eax, ecx $sequence_1 = { 0fbe4c05d4 3bd1 750e c6459b01 8b4d10 e8???????? ebbf } // n = 7, score = 100 // 0fbe4c05d4 | movsx ecx, byte ptr [ebp + eax - 0x2c] // 3bd1 | cmp edx, ecx // 750e | jne 0x10 // c6459b01 | mov byte ptr [ebp - 0x65], 1 // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // e8???????? | // ebbf | jmp 0xffffffc1 $sequence_2 = { 51 6a03 8d55c0 52 e8???????? 83c40c 8b85f4feffff } // n = 7, score = 100 // 51 | push ecx // 6a03 | push 3 // 8d55c0 | lea edx, [ebp - 0x40] // 52 | push edx // e8???????? | // 83c40c | add esp, 0xc // 8b85f4feffff | mov eax, dword ptr [ebp - 0x10c] $sequence_3 = { c785bcafffff14765500 eb0a c785bcafffff2c765500 6a00 6835010000 68???????? 68???????? } // n = 7, score = 100 // c785bcafffff14765500 | mov dword ptr [ebp - 0x5044], 0x557614 // eb0a | jmp 0xc // c785bcafffff2c765500 | mov dword ptr [ebp - 0x5044], 0x55762c // 6a00 | push 0 // 6835010000 | push 0x135 // 68???????? | // 68???????? | $sequence_4 = { 8d4dc4 e8???????? 0fbe00 83f87f 7424 8b4d94 51 } // n = 7, score = 100 // 8d4dc4 | lea ecx, [ebp - 0x3c] // e8???????? | // 0fbe00 | movsx eax, byte ptr [eax] // 83f87f | cmp eax, 0x7f // 7424 | je 0x26 // 8b4d94 | mov ecx, dword ptr [ebp - 0x6c] // 51 | push ecx $sequence_5 = { 83c001 8945b0 8b4db0 3b4d9c 7326 8b55b0 52 } // n = 7, score = 100 // 83c001 | add eax, 1 // 8945b0 | mov dword ptr [ebp - 0x50], eax // 8b4db0 | mov ecx, dword ptr [ebp - 0x50] // 3b4d9c | cmp ecx, dword ptr [ebp - 0x64] // 7326 | jae 0x28 // 8b55b0 | mov edx, dword ptr [ebp - 0x50] // 52 | push edx $sequence_6 = { 8b4df8 e8???????? 50 e8???????? 83c404 898528ffffff } // n = 6, score = 100 // 8b4df8 | mov ecx, dword ptr [ebp - 8] // e8???????? | // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 898528ffffff | mov dword ptr [ebp - 0xd8], eax $sequence_7 = { 8b5508 8b45e8 8b7508 d90486 d95c8afc 8b4de8 8b5508 } // n = 7, score = 100 // 8b5508 | mov edx, dword ptr [ebp + 8] // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 8b7508 | mov esi, dword ptr [ebp + 8] // d90486 | fld dword ptr [esi + eax*4] // d95c8afc | fstp dword ptr [edx + ecx*4 - 4] // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 8b5508 | mov edx, dword ptr [ebp + 8] $sequence_8 = { 8b4d14 e8???????? 8bf0 8d4db8 e8???????? 3bf0 761c } // n = 7, score = 100 // 8b4d14 | mov ecx, dword ptr [ebp + 0x14] // e8???????? | // 8bf0 | mov esi, eax // 8d4db8 | lea ecx, [ebp - 0x48] // e8???????? | // 3bf0 | cmp esi, eax // 761c | jbe 0x1e $sequence_9 = { 0f85a1000000 e8???????? 8945e4 68b9020000 68???????? 8b4de4 51 } // n = 7, score = 100 // 0f85a1000000 | jne 0xa7 // e8???????? | // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 68b9020000 | push 0x2b9 // 68???????? | // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 51 | push ecx condition: 7 of them and filesize < 3126272 }
rule win_xfscashncr_w0 { meta: description = "Detects ATM Malware XFSCashNCR" author = "Frank Boldewin (@r3c0nst)" reference = "https://twitter.com/r3c0nst/status/1166773324548063232" date = "2019-08-28" hash1 = "d6dff67a6b4423b5721908bdcc668951f33b3c214e318051c96e8c158e8931c0" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xfscashncr" malpedia_version = "20191004" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $Code1 = {50 8b 4d e8 8b 51 10 52 6a 00 68 2d 01 00 00 8b 45 e8 0f b7 48 1c 51 e8} // CDM Status $Code2 = {52 8d 45 d0 50 68 2e 01 00 00 8b 4d e8 0f b7 51 1c 52 e8} // Dispense $StatusMessage1 = "[+] Ingrese Denominacion ISO" nocase ascii $StatusMessage2 = "[+] Ingrese numero de billetes" nocase ascii $StatusMessage3 = "[!] FAIL.. dispensadores no encontrados" nocase ascii $StatusMessage4 = "[!] Unable continue, IMPOSIBLE abrir dispenser" nocase ascii $PDB = "C:\\Users\\cyttek\\Downloads\\xfs_cashXP\\Debug\\xfs_cash_ncr.pdb" nocase ascii $LogFile = "XfsLog.txt" nocase ascii condition: uint16(0) == 0x5A4D and filesize < 1500KB and 4 of them }
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