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rule win_ripper_atm_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8bec 8b4508 8bd1 eb17 85d2 740a } // n = 6, score = 100 // 8bec | mov ebp, esp // 8b4508 | mov eax, dword ptr [ebp + 8] // 8bd1 | mov edx, ecx // eb17 | jmp 0x19 // 85d2 | test edx, edx // 740a | je 0xc $sequence_1 = { 8bc8 894de0 85c9 7465 890c9df0974400 8305????????20 } // n = 6, score = 100 // 8bc8 | mov ecx, eax // 894de0 | mov dword ptr [ebp - 0x20], ecx // 85c9 | test ecx, ecx // 7465 | je 0x67 // 890c9df0974400 | mov dword ptr [ebx*4 + 0x4497f0], ecx // 8305????????20 | $sequence_2 = { 68???????? c645fc01 e8???????? e8???????? 83c418 84c0 } // n = 6, score = 100 // 68???????? | // c645fc01 | mov byte ptr [ebp - 4], 1 // e8???????? | // e8???????? | // 83c418 | add esp, 0x18 // 84c0 | test al, al $sequence_3 = { 8b7df8 8d4624 33db 52 8d4df0 51 8bc8 } // n = 7, score = 100 // 8b7df8 | mov edi, dword ptr [ebp - 8] // 8d4624 | lea eax, [esi + 0x24] // 33db | xor ebx, ebx // 52 | push edx // 8d4df0 | lea ecx, [ebp - 0x10] // 51 | push ecx // 8bc8 | mov ecx, eax $sequence_4 = { ff15???????? 8bd8 85db 7505 83ceff eb0e } // n = 6, score = 100 // ff15???????? | // 8bd8 | mov ebx, eax // 85db | test ebx, ebx // 7505 | jne 7 // 83ceff | or esi, 0xffffffff // eb0e | jmp 0x10 $sequence_5 = { 85ff 7533 807def00 8b45e8 50 8b08 740a } // n = 7, score = 100 // 85ff | test edi, edi // 7533 | jne 0x35 // 807def00 | cmp byte ptr [ebp - 0x11], 0 // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 50 | push eax // 8b08 | mov ecx, dword ptr [eax] // 740a | je 0xc $sequence_6 = { 8d45ec 50 8bce e8???????? 8b06 015e0c 8365f800 } // n = 7, score = 100 // 8d45ec | lea eax, [ebp - 0x14] // 50 | push eax // 8bce | mov ecx, esi // e8???????? | // 8b06 | mov eax, dword ptr [esi] // 015e0c | add dword ptr [esi + 0xc], ebx // 8365f800 | and dword ptr [ebp - 8], 0 $sequence_7 = { 8a7d0c 8b7704 8975f4 84db 0f88a2000000 0fbecf 0fbec3 } // n = 7, score = 100 // 8a7d0c | mov bh, byte ptr [ebp + 0xc] // 8b7704 | mov esi, dword ptr [edi + 4] // 8975f4 | mov dword ptr [ebp - 0xc], esi // 84db | test bl, bl // 0f88a2000000 | js 0xa8 // 0fbecf | movsx ecx, bh // 0fbec3 | movsx eax, bl $sequence_8 = { e8???????? 83780407 755d 68???????? 8d8dd8f7ffff e8???????? 83ec18 } // n = 7, score = 100 // e8???????? | // 83780407 | cmp dword ptr [eax + 4], 7 // 755d | jne 0x5f // 68???????? | // 8d8dd8f7ffff | lea ecx, [ebp - 0x828] // e8???????? | // 83ec18 | sub esp, 0x18 $sequence_9 = { 8b750c 8b5510 3b37 7512 8b02 3b4610 0f8da7000000 } // n = 7, score = 100 // 8b750c | mov esi, dword ptr [ebp + 0xc] // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 3b37 | cmp esi, dword ptr [edi] // 7512 | jne 0x14 // 8b02 | mov eax, dword ptr [edx] // 3b4610 | cmp eax, dword ptr [esi + 0x10] // 0f8da7000000 | jge 0xad condition: 7 of them and filesize < 724992 }
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