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rule win_ripper_atm_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.ripper_atm." 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.ripper_atm" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8b7d08 2175fc 397714 7e2a ff770c 8b33 8bcb } // n = 7, score = 100 // 8b7d08 | mov edi, dword ptr [ebp + 8] // 2175fc | and dword ptr [ebp - 4], esi // 397714 | cmp dword ptr [edi + 0x14], esi // 7e2a | jle 0x2c // ff770c | push dword ptr [edi + 0xc] // 8b33 | mov esi, dword ptr [ebx] // 8bcb | mov ecx, ebx $sequence_1 = { 0f434dd8 837dd408 8d5598 52 8d9550ffffff 52 } // n = 6, score = 100 // 0f434dd8 | cmovae ecx, dword ptr [ebp - 0x28] // 837dd408 | cmp dword ptr [ebp - 0x2c], 8 // 8d5598 | lea edx, [ebp - 0x68] // 52 | push edx // 8d9550ffffff | lea edx, [ebp - 0xb0] // 52 | push edx $sequence_2 = { 3938 8b45ec 7408 8b4de8 3b4810 7327 8b4e08 } // n = 7, score = 100 // 3938 | cmp dword ptr [eax], edi // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 7408 | je 0xa // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 3b4810 | cmp ecx, dword ptr [eax + 0x10] // 7327 | jae 0x29 // 8b4e08 | mov ecx, dword ptr [esi + 8] $sequence_3 = { 6a0f 50 ff15???????? 85c0 7402 32c0 c20800 } // n = 7, score = 100 // 6a0f | push 0xf // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 7402 | je 4 // 32c0 | xor al, al // c20800 | ret 8 $sequence_4 = { 8b02 6a04 8b4804 03ca e8???????? } // n = 5, score = 100 // 8b02 | mov eax, dword ptr [edx] // 6a04 | push 4 // 8b4804 | mov ecx, dword ptr [eax + 4] // 03ca | add ecx, edx // e8???????? | $sequence_5 = { 6a1c e8???????? 59 85c0 7420 33c9 c7400410000000 } // n = 7, score = 100 // 6a1c | push 0x1c // e8???????? | // 59 | pop ecx // 85c0 | test eax, eax // 7420 | je 0x22 // 33c9 | xor ecx, ecx // c7400410000000 | mov dword ptr [eax + 4], 0x10 $sequence_6 = { c1f805 83e21f 8b0c85f0974400 c1e206 8a441124 3245fe 247f } // n = 7, score = 100 // c1f805 | sar eax, 5 // 83e21f | and edx, 0x1f // 8b0c85f0974400 | mov ecx, dword ptr [eax*4 + 0x4497f0] // c1e206 | shl edx, 6 // 8a441124 | mov al, byte ptr [ecx + edx + 0x24] // 3245fe | xor al, byte ptr [ebp - 2] // 247f | and al, 0x7f $sequence_7 = { 51 8d55c8 8d4d8c e8???????? 83c410 84c0 7445 } // n = 7, score = 100 // 51 | push ecx // 8d55c8 | lea edx, [ebp - 0x38] // 8d4d8c | lea ecx, [ebp - 0x74] // e8???????? | // 83c410 | add esp, 0x10 // 84c0 | test al, al // 7445 | je 0x47 $sequence_8 = { 8bf9 50 e8???????? ff7518 8d45ec ff7514 8bcf } // n = 7, score = 100 // 8bf9 | mov edi, ecx // 50 | push eax // e8???????? | // ff7518 | push dword ptr [ebp + 0x18] // 8d45ec | lea eax, [ebp - 0x14] // ff7514 | push dword ptr [ebp + 0x14] // 8bcf | mov ecx, edi $sequence_9 = { 03f0 8b442424 2bc1 99 f77c2418 47 3bf8 } // n = 7, score = 100 // 03f0 | add esi, eax // 8b442424 | mov eax, dword ptr [esp + 0x24] // 2bc1 | sub eax, ecx // 99 | cdq // f77c2418 | idiv dword ptr [esp + 0x18] // 47 | inc edi // 3bf8 | cmp edi, eax condition: 7 of them and filesize < 724992 }
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