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rule win_ripper_atm_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "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 = { 897e70 6a43 58 668986b8000000 668986be010000 c74668d87b4300 83a6b803000000 } // n = 7, score = 100 // 897e70 | mov dword ptr [esi + 0x70], edi // 6a43 | push 0x43 // 58 | pop eax // 668986b8000000 | mov word ptr [esi + 0xb8], ax // 668986be010000 | mov word ptr [esi + 0x1be], ax // c74668d87b4300 | mov dword ptr [esi + 0x68], 0x437bd8 // 83a6b803000000 | and dword ptr [esi + 0x3b8], 0 $sequence_1 = { 33db e8???????? 895c2438 8b442424 8b4c2420 } // n = 5, score = 100 // 33db | xor ebx, ebx // e8???????? | // 895c2438 | mov dword ptr [esp + 0x38], ebx // 8b442424 | mov eax, dword ptr [esp + 0x24] // 8b4c2420 | mov ecx, dword ptr [esp + 0x20] $sequence_2 = { 895130 885120 33c0 66894106 895138 } // n = 5, score = 100 // 895130 | mov dword ptr [ecx + 0x30], edx // 885120 | mov byte ptr [ecx + 0x20], dl // 33c0 | xor eax, eax // 66894106 | mov word ptr [ecx + 6], ax // 895138 | mov dword ptr [ecx + 0x38], edx $sequence_3 = { 8b7164 57 ff742410 894168 89516c } // n = 5, score = 100 // 8b7164 | mov esi, dword ptr [ecx + 0x64] // 57 | push edi // ff742410 | push dword ptr [esp + 0x10] // 894168 | mov dword ptr [ecx + 0x68], eax // 89516c | mov dword ptr [ecx + 0x6c], edx $sequence_4 = { 0f434dbc 53 51 ff75b8 ffd7 ff75b8 8b1d???????? } // n = 7, score = 100 // 0f434dbc | cmovae ecx, dword ptr [ebp - 0x44] // 53 | push ebx // 51 | push ecx // ff75b8 | push dword ptr [ebp - 0x48] // ffd7 | call edi // ff75b8 | push dword ptr [ebp - 0x48] // 8b1d???????? | $sequence_5 = { 68???????? 6804040000 57 68???????? 897dd8 ff15???????? 8bf0 } // n = 7, score = 100 // 68???????? | // 6804040000 | push 0x404 // 57 | push edi // 68???????? | // 897dd8 | mov dword ptr [ebp - 0x28], edi // ff15???????? | // 8bf0 | mov esi, eax $sequence_6 = { 334ad8 3342dc 334a28 33422c 330a 334204 894cf428 } // n = 7, score = 100 // 334ad8 | xor ecx, dword ptr [edx - 0x28] // 3342dc | xor eax, dword ptr [edx - 0x24] // 334a28 | xor ecx, dword ptr [edx + 0x28] // 33422c | xor eax, dword ptr [edx + 0x2c] // 330a | xor ecx, dword ptr [edx] // 334204 | xor eax, dword ptr [edx + 4] // 894cf428 | mov dword ptr [esp + esi*8 + 0x28], ecx $sequence_7 = { 7423 3d00000400 7550 80c980 884c3704 8b0c9df0974400 8a443124 } // n = 7, score = 100 // 7423 | je 0x25 // 3d00000400 | cmp eax, 0x40000 // 7550 | jne 0x52 // 80c980 | or cl, 0x80 // 884c3704 | mov byte ptr [edi + esi + 4], cl // 8b0c9df0974400 | mov ecx, dword ptr [ebx*4 + 0x4497f0] // 8a443124 | mov al, byte ptr [ecx + esi + 0x24] $sequence_8 = { e8???????? e8???????? e9???????? 8d85bcf7ffff 50 e8???????? 83780402 } // n = 7, score = 100 // e8???????? | // e8???????? | // e9???????? | // 8d85bcf7ffff | lea eax, [ebp - 0x844] // 50 | push eax // e8???????? | // 83780402 | cmp dword ptr [eax + 4], 2 $sequence_9 = { 85c0 0f44f3 8bc6 5e 33cd 5b } // n = 6, score = 100 // 85c0 | test eax, eax // 0f44f3 | cmove esi, ebx // 8bc6 | mov eax, esi // 5e | pop esi // 33cd | xor ecx, ebp // 5b | pop ebx condition: 7 of them and filesize < 724992 }
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