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rule win_magniber_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.magniber." 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.magniber" 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 = { 8b55fc 8b8270040000 3b45f8 733c b902000000 } // n = 5, score = 400 // 8b55fc | mov edx, dword ptr [ebp - 4] // 8b8270040000 | mov eax, dword ptr [edx + 0x470] // 3b45f8 | cmp eax, dword ptr [ebp - 8] // 733c | jae 0x3e // b902000000 | mov ecx, 2 $sequence_1 = { 8b4514 50 e8???????? 83c410 b801000000 eb02 } // n = 6, score = 400 // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 50 | push eax // e8???????? | // 83c410 | add esp, 0x10 // b801000000 | mov eax, 1 // eb02 | jmp 4 $sequence_2 = { 51 ff15???????? 68???????? 8d9564f7ffff 52 } // n = 5, score = 400 // 51 | push ecx // ff15???????? | // 68???????? | // 8d9564f7ffff | lea edx, [ebp - 0x89c] // 52 | push edx $sequence_3 = { c785a0feffff109d4000 c785a4feffff189d4000 c785a8feffff209d4000 c785acfeffff289d4000 } // n = 4, score = 400 // c785a0feffff109d4000 | mov dword ptr [ebp - 0x160], 0x409d10 // c785a4feffff189d4000 | mov dword ptr [ebp - 0x15c], 0x409d18 // c785a8feffff209d4000 | mov dword ptr [ebp - 0x158], 0x409d20 // c785acfeffff289d4000 | mov dword ptr [ebp - 0x154], 0x409d28 $sequence_4 = { 83c408 eb02 eb05 e9???????? 8b45e4 50 } // n = 6, score = 400 // 83c408 | add esp, 8 // eb02 | jmp 4 // eb05 | jmp 7 // e9???????? | // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 50 | push eax $sequence_5 = { 50 ff15???????? 50 8d8d8cf9ffff 51 6a00 } // n = 6, score = 400 // 50 | push eax // ff15???????? | // 50 | push eax // 8d8d8cf9ffff | lea ecx, [ebp - 0x674] // 51 | push ecx // 6a00 | push 0 $sequence_6 = { 8945fc 837dfc00 7430 c745f000000000 c745e804000000 } // n = 5, score = 400 // 8945fc | mov dword ptr [ebp - 4], eax // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 7430 | je 0x32 // c745f000000000 | mov dword ptr [ebp - 0x10], 0 // c745e804000000 | mov dword ptr [ebp - 0x18], 4 $sequence_7 = { 740c 8b55fc c7420c00400000 eb0a 8b45fc } // n = 5, score = 400 // 740c | je 0xe // 8b55fc | mov edx, dword ptr [ebp - 4] // c7420c00400000 | mov dword ptr [edx + 0xc], 0x4000 // eb0a | jmp 0xc // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_8 = { d331 4e4e54 70ac 52 f8 a6 } // n = 6, score = 100 // d331 | mov dh, 0x36 // 4e4e54 | sal dword ptr [ecx], cl // 70ac | dec esi // 52 | dec esi // f8 | push esp // a6 | jo 0xffffffae $sequence_9 = { 29aed0515fa6 8d4f0e 7f4c c82cd1c6 1a32 b636 } // n = 6, score = 100 // 29aed0515fa6 | loop 0x26 // 8d4f0e | sub dword ptr [esi - 0x59a0ae30], ebp // 7f4c | lea ecx, [edi + 0xe] // c82cd1c6 | jg 0x51 // 1a32 | enter -0x2ed4, -0x3a // b636 | sbb dh, byte ptr [edx] $sequence_10 = { f8 a6 6e d89bcb299b94 } // n = 4, score = 100 // f8 | sub byte ptr [edi + 0x44], bl // a6 | rol edi, 0xd // 6e | loopne 0xfffffffa // d89bcb299b94 | sub dword ptr [esi - 0x59a0ae30], ebp $sequence_11 = { 3e6c 21746c2e 4834b0 184026 e221 a1????????05eef081 } // n = 6, score = 100 // 3e6c | insb byte ptr es:[edi], dx // 21746c2e | and dword ptr [esp + ebp*2 + 0x2e], esi // 4834b0 | dec eax // 184026 | xor al, 0xb0 // e221 | sbb byte ptr [eax + 0x26], al // a1????????05eef081 | $sequence_12 = { 52 fc 285f44 c1c70d } // n = 4, score = 100 // 52 | push edx // fc | cld // 285f44 | sub byte ptr [edi + 0x44], bl // c1c70d | rol edi, 0xd $sequence_13 = { 56 18cb 52 fc } // n = 4, score = 100 // 56 | enter -0x2ed4, -0x3a // 18cb | sbb dh, byte ptr [edx] // 52 | sbb bl, cl // fc | push edx $sequence_14 = { e8???????? 32cb 5a b3b1 } // n = 4, score = 100 // e8???????? | // 32cb | lea ecx, [edi + 0xe] // 5a | jg 0x57 // b3b1 | enter -0x2ed4, -0x3a $sequence_15 = { e221 a1????????05eef081 e0f8 29aed0515fa6 8d4f0e 7f4c } // n = 6, score = 100 // e221 | push edx // a1????????05eef081 | // e0f8 | clc // 29aed0515fa6 | cmpsb byte ptr [esi], byte ptr es:[edi] // 8d4f0e | outsb dx, byte ptr [esi] // 7f4c | fcomp dword ptr [ebx - 0x6b64d635] condition: 7 of them and filesize < 117760 }
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