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rule win_bitter_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.bitter_rat." 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.bitter_rat" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 68???????? e8???????? 83c40c 6a2d 68???????? } // n = 5, score = 200 // 68???????? | // e8???????? | // 83c40c | add esp, 0xc // 6a2d | push 0x2d // 68???????? | $sequence_1 = { 52 0fb7851efaffff 50 0fb78d22faffff } // n = 4, score = 200 // 52 | push edx // 0fb7851efaffff | movzx eax, word ptr [ebp - 0x5e2] // 50 | push eax // 0fb78d22faffff | movzx ecx, word ptr [ebp - 0x5de] $sequence_2 = { e8???????? 83c40c 8b45f8 83c002 8945f8 6a02 } // n = 6, score = 200 // e8???????? | // 83c40c | add esp, 0xc // 8b45f8 | mov eax, dword ptr [ebp - 8] // 83c002 | add eax, 2 // 8945f8 | mov dword ptr [ebp - 8], eax // 6a02 | push 2 $sequence_3 = { 6bc918 8bf4 8b55f4 0fb7440a14 50 } // n = 5, score = 200 // 6bc918 | imul ecx, ecx, 0x18 // 8bf4 | mov esi, esp // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 0fb7440a14 | movzx eax, word ptr [edx + ecx + 0x14] // 50 | push eax $sequence_4 = { 8b4508 33c9 3b04cd00344500 7413 } // n = 4, score = 200 // 8b4508 | mov eax, dword ptr [ebp + 8] // 33c9 | xor ecx, ecx // 3b04cd00344500 | cmp eax, dword ptr [ecx*8 + 0x453400] // 7413 | je 0x15 $sequence_5 = { f7fb 85d2 740d 8bc6 c1e002 8bb070474500 eb0b } // n = 7, score = 200 // f7fb | idiv ebx // 85d2 | test edx, edx // 740d | je 0xf // 8bc6 | mov eax, esi // c1e002 | shl eax, 2 // 8bb070474500 | mov esi, dword ptr [eax + 0x454770] // eb0b | jmp 0xd $sequence_6 = { ff3485840e4500 8d4de8 e8???????? a1???????? } // n = 4, score = 200 // ff3485840e4500 | push dword ptr [eax*4 + 0x450e84] // 8d4de8 | lea ecx, dword ptr [ebp - 0x18] // e8???????? | // a1???????? | $sequence_7 = { c705????????00000000 c705????????00000000 c705????????a10f0000 8b45f4 898578c4ffff 8b8d78c4ffff 51 } // n = 7, score = 200 // c705????????00000000 | // c705????????00000000 | // c705????????a10f0000 | // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 898578c4ffff | mov dword ptr [ebp - 0x3b88], eax // 8b8d78c4ffff | mov ecx, dword ptr [ebp - 0x3b88] // 51 | push ecx $sequence_8 = { e8???????? 8945f4 eb14 8bf4 6810270000 } // n = 5, score = 200 // e8???????? | // 8945f4 | mov dword ptr [ebp - 0xc], eax // eb14 | jmp 0x16 // 8bf4 | mov esi, esp // 6810270000 | push 0x2710 $sequence_9 = { 8b45a0 50 ff15???????? 3bf4 e8???????? 894594 } // n = 6, score = 200 // 8b45a0 | mov eax, dword ptr [ebp - 0x60] // 50 | push eax // ff15???????? | // 3bf4 | cmp esi, esp // e8???????? | // 894594 | mov dword ptr [ebp - 0x6c], eax condition: 7 of them and filesize < 1130496 }
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