Actor(s): SNOWGLOBE
There is no description at this point.
rule win_evilbunny_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.evilbunny." 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.evilbunny" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 8b55a8 8b4508 8a08 880a 8b55a8 83c201 8955a8 } // n = 7, score = 200 // 8b55a8 | mov edx, dword ptr [ebp - 0x58] // 8b4508 | mov eax, dword ptr [ebp + 8] // 8a08 | mov cl, byte ptr [eax] // 880a | mov byte ptr [edx], cl // 8b55a8 | mov edx, dword ptr [ebp - 0x58] // 83c201 | add edx, 1 // 8955a8 | mov dword ptr [ebp - 0x58], edx $sequence_1 = { 8d4d84 e8???????? 8a8547fdffff 52 8bcd 50 8d15dceb1100 } // n = 7, score = 200 // 8d4d84 | lea ecx, [ebp - 0x7c] // e8???????? | // 8a8547fdffff | mov al, byte ptr [ebp - 0x2b9] // 52 | push edx // 8bcd | mov ecx, ebp // 50 | push eax // 8d15dceb1100 | lea edx, [0x11ebdc] $sequence_2 = { 8b8dd8feffff 0b8dd4feffff 238dd0feffff 0bd1 03c2 8945f4 8b95ccfeffff } // n = 7, score = 200 // 8b8dd8feffff | mov ecx, dword ptr [ebp - 0x128] // 0b8dd4feffff | or ecx, dword ptr [ebp - 0x12c] // 238dd0feffff | and ecx, dword ptr [ebp - 0x130] // 0bd1 | or edx, ecx // 03c2 | add eax, edx // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b95ccfeffff | mov edx, dword ptr [ebp - 0x134] $sequence_3 = { e8???????? 83c408 8b4d10 51 8b5508 8b4240 50 } // n = 7, score = 200 // e8???????? | // 83c408 | add esp, 8 // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 51 | push ecx // 8b5508 | mov edx, dword ptr [ebp + 8] // 8b4240 | mov eax, dword ptr [edx + 0x40] // 50 | push eax $sequence_4 = { 734a 8b45d4 2b45cc 50 8b4dcc 51 8d55b0 } // n = 7, score = 200 // 734a | jae 0x4c // 8b45d4 | mov eax, dword ptr [ebp - 0x2c] // 2b45cc | sub eax, dword ptr [ebp - 0x34] // 50 | push eax // 8b4dcc | mov ecx, dword ptr [ebp - 0x34] // 51 | push ecx // 8d55b0 | lea edx, [ebp - 0x50] $sequence_5 = { 8b4dfc e8???????? 0345f8 8945f8 e9???????? b801000000 83c420 } // n = 7, score = 200 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // e8???????? | // 0345f8 | add eax, dword ptr [ebp - 8] // 8945f8 | mov dword ptr [ebp - 8], eax // e9???????? | // b801000000 | mov eax, 1 // 83c420 | add esp, 0x20 $sequence_6 = { 8b5508 0fb64201 c1f804 83e00f 0bc8 8b55fc a1???????? } // n = 7, score = 200 // 8b5508 | mov edx, dword ptr [ebp + 8] // 0fb64201 | movzx eax, byte ptr [edx + 1] // c1f804 | sar eax, 4 // 83e00f | and eax, 0xf // 0bc8 | or ecx, eax // 8b55fc | mov edx, dword ptr [ebp - 4] // a1???????? | $sequence_7 = { 8b8d70eeffff 898d90eeffff 8b9590eeffff 899598eeffff 8b8d98eeffff e8???????? 85c0 } // n = 7, score = 200 // 8b8d70eeffff | mov ecx, dword ptr [ebp - 0x1190] // 898d90eeffff | mov dword ptr [ebp - 0x1170], ecx // 8b9590eeffff | mov edx, dword ptr [ebp - 0x1170] // 899598eeffff | mov dword ptr [ebp - 0x1168], edx // 8b8d98eeffff | mov ecx, dword ptr [ebp - 0x1168] // e8???????? | // 85c0 | test eax, eax $sequence_8 = { 8b550c 895114 8b45fc 8b4d10 894818 8b55f8 8955ec } // n = 7, score = 200 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 895114 | mov dword ptr [ecx + 0x14], edx // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 894818 | mov dword ptr [eax + 0x18], ecx // 8b55f8 | mov edx, dword ptr [ebp - 8] // 8955ec | mov dword ptr [ebp - 0x14], edx $sequence_9 = { d9add6fdffff 8b8dc8fdffff 2b4dfc 51 8b550c 52 e8???????? } // n = 7, score = 200 // d9add6fdffff | fldcw word ptr [ebp - 0x22a] // 8b8dc8fdffff | mov ecx, dword ptr [ebp - 0x238] // 2b4dfc | sub ecx, dword ptr [ebp - 4] // 51 | push ecx // 8b550c | mov edx, dword ptr [ebp + 0xc] // 52 | push edx // e8???????? | condition: 7 of them and filesize < 1695744 }
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