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rule win_mylobot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.mylobot." 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.mylobot" 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 = { 7d04 c6062d 46 c60600 4e eb0a 8a0f } // n = 7, score = 1000 // 7d04 | jge 6 // c6062d | mov byte ptr [esi], 0x2d // 46 | inc esi // c60600 | mov byte ptr [esi], 0 // 4e | dec esi // eb0a | jmp 0xc // 8a0f | mov cl, byte ptr [edi] $sequence_1 = { 81c41c040000 c20400 55 8d44241c 50 a1???????? ffb070010000 } // n = 7, score = 1000 // 81c41c040000 | add esp, 0x41c // c20400 | ret 4 // 55 | push ebp // 8d44241c | lea eax, dword ptr [esp + 0x1c] // 50 | push eax // a1???????? | // ffb070010000 | push dword ptr [eax + 0x170] $sequence_2 = { 5e 8bc1 5b c3 55 8bec 51 } // n = 7, score = 1000 // 5e | pop esi // 8bc1 | mov eax, ecx // 5b | pop ebx // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 51 | push ecx $sequence_3 = { 7522 43 3b5c2410 76a4 a1???????? 57 ff9084000000 } // n = 7, score = 1000 // 7522 | jne 0x24 // 43 | inc ebx // 3b5c2410 | cmp ebx, dword ptr [esp + 0x10] // 76a4 | jbe 0xffffffa6 // a1???????? | // 57 | push edi // ff9084000000 | call dword ptr [eax + 0x84] $sequence_4 = { 56 ffd3 8b0d???????? 55 89813c010000 8d442414 50 } // n = 7, score = 1000 // 56 | push esi // ffd3 | call ebx // 8b0d???????? | // 55 | push ebp // 89813c010000 | mov dword ptr [ecx + 0x13c], eax // 8d442414 | lea eax, dword ptr [esp + 0x14] // 50 | push eax $sequence_5 = { 85c0 7557 56 8d85f8fdffff 6804010000 50 e8???????? } // n = 7, score = 1000 // 85c0 | test eax, eax // 7557 | jne 0x59 // 56 | push esi // 8d85f8fdffff | lea eax, dword ptr [ebp - 0x208] // 6804010000 | push 0x104 // 50 | push eax // e8???????? | $sequence_6 = { 85c0 74d5 3975fc 75d0 8d45f8 50 6a40 } // n = 7, score = 1000 // 85c0 | test eax, eax // 74d5 | je 0xffffffd7 // 3975fc | cmp dword ptr [ebp - 4], esi // 75d0 | jne 0xffffffd2 // 8d45f8 | lea eax, dword ptr [ebp - 8] // 50 | push eax // 6a40 | push 0x40 $sequence_7 = { 56 8b7510 56 6a00 ff750c e8???????? 8b5d08 } // n = 7, score = 1000 // 56 | push esi // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 56 | push esi // 6a00 | push 0 // ff750c | push dword ptr [ebp + 0xc] // e8???????? | // 8b5d08 | mov ebx, dword ptr [ebp + 8] $sequence_8 = { 83e201 8d8578f9ffff 51 52 50 8d8db4fbffff } // n = 6, score = 800 // 83e201 | and edx, 1 // 8d8578f9ffff | lea eax, dword ptr [ebp - 0x688] // 51 | push ecx // 52 | push edx // 50 | push eax // 8d8db4fbffff | lea ecx, dword ptr [ebp - 0x44c] $sequence_9 = { 3c02 740a b857000000 5e 8be5 5d c3 } // n = 7, score = 800 // 3c02 | cmp al, 2 // 740a | je 0xc // b857000000 | mov eax, 0x57 // 5e | pop esi // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret $sequence_10 = { 7c05 b805400080 5f 5e 5b } // n = 5, score = 800 // 7c05 | jl 7 // b805400080 | mov eax, 0x80004005 // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_11 = { 8bf0 85f6 787f 8b45f4 85c0 } // n = 5, score = 800 // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 787f | js 0x81 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 85c0 | test eax, eax $sequence_12 = { 85c0 0f88e1000000 6a00 6a00 6a00 6a03 } // n = 6, score = 800 // 85c0 | test eax, eax // 0f88e1000000 | js 0xe7 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6a03 | push 3 $sequence_13 = { c745f400000000 c745f000000000 743d 8b45fc 8b10 } // n = 5, score = 800 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // c745f000000000 | mov dword ptr [ebp - 0x10], 0 // 743d | je 0x3f // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b10 | mov edx, dword ptr [eax] $sequence_14 = { 8b4508 8b480c 83b9f800000000 7540 68???????? } // n = 5, score = 800 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b480c | mov ecx, dword ptr [eax + 0xc] // 83b9f800000000 | cmp dword ptr [ecx + 0xf8], 0 // 7540 | jne 0x42 // 68???????? | $sequence_15 = { 50 ffd6 83c802 50 8d8dd8fdffff 51 } // n = 6, score = 800 // 50 | push eax // ffd6 | call esi // 83c802 | or eax, 2 // 50 | push eax // 8d8dd8fdffff | lea ecx, dword ptr [ebp - 0x228] // 51 | push ecx condition: 7 of them and filesize < 8028160 }
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