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rule win_mylobot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 50 8d85c8faffff 50 e8???????? 8d45d4 50 } // n = 6, score = 1000 // 50 | push eax // 8d85c8faffff | lea eax, [ebp - 0x538] // 50 | push eax // e8???????? | // 8d45d4 | lea eax, [ebp - 0x2c] // 50 | push eax $sequence_1 = { 85d2 7413 57 8b7c2410 2bf8 8a0c37 880e } // n = 7, score = 1000 // 85d2 | test edx, edx // 7413 | je 0x15 // 57 | push edi // 8b7c2410 | mov edi, dword ptr [esp + 0x10] // 2bf8 | sub edi, eax // 8a0c37 | mov cl, byte ptr [edi + esi] // 880e | mov byte ptr [esi], cl $sequence_2 = { 56 57 ffb424a4000000 bb01000080 53 e8???????? 59 } // n = 7, score = 1000 // 56 | push esi // 57 | push edi // ffb424a4000000 | push dword ptr [esp + 0xa4] // bb01000080 | mov ebx, 0x80000001 // 53 | push ebx // e8???????? | // 59 | pop ecx $sequence_3 = { 75dd 39542418 7d04 c6062d 46 } // n = 5, score = 1000 // 75dd | jne 0xffffffdf // 39542418 | cmp dword ptr [esp + 0x18], edx // 7d04 | jge 6 // c6062d | mov byte ptr [esi], 0x2d // 46 | inc esi $sequence_4 = { 8bf0 41 894dfc 85f6 } // n = 4, score = 1000 // 8bf0 | mov esi, eax // 41 | inc ecx // 894dfc | mov dword ptr [ebp - 4], ecx // 85f6 | test esi, esi $sequence_5 = { 7413 68???????? 56 e8???????? 47 59 59 } // n = 7, score = 1000 // 7413 | je 0x15 // 68???????? | // 56 | push esi // e8???????? | // 47 | inc edi // 59 | pop ecx // 59 | pop ecx $sequence_6 = { 6a1a 56 ff903c010000 85c0 752f } // n = 5, score = 1000 // 6a1a | push 0x1a // 56 | push esi // ff903c010000 | call dword ptr [eax + 0x13c] // 85c0 | test eax, eax // 752f | jne 0x31 $sequence_7 = { ff15???????? 68???????? 8d85e0fdffff 50 ff15???????? 8d45f8 50 } // n = 7, score = 1000 // ff15???????? | // 68???????? | // 8d85e0fdffff | lea eax, [ebp - 0x220] // 50 | push eax // ff15???????? | // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax $sequence_8 = { 6a00 6a00 8d8de0feffff 51 8d95dcfdffff 52 } // n = 6, score = 800 // 6a00 | push 0 // 6a00 | push 0 // 8d8de0feffff | lea ecx, [ebp - 0x120] // 51 | push ecx // 8d95dcfdffff | lea edx, [ebp - 0x224] // 52 | push edx $sequence_9 = { 8bc7 83c420 8d4801 8a10 40 84d2 } // n = 6, score = 800 // 8bc7 | mov eax, edi // 83c420 | add esp, 0x20 // 8d4801 | lea ecx, [eax + 1] // 8a10 | mov dl, byte ptr [eax] // 40 | inc eax // 84d2 | test dl, dl $sequence_10 = { 03c2 3bf8 7502 893b } // n = 4, score = 800 // 03c2 | add eax, edx // 3bf8 | cmp edi, eax // 7502 | jne 4 // 893b | mov dword ptr [ebx], edi $sequence_11 = { 6a00 6805020000 8d85f8fdffff 50 51 ff15???????? 3d05020000 } // n = 7, score = 800 // 6a00 | push 0 // 6805020000 | push 0x205 // 8d85f8fdffff | lea eax, [ebp - 0x208] // 50 | push eax // 51 | push ecx // ff15???????? | // 3d05020000 | cmp eax, 0x205 $sequence_12 = { 52 ff15???????? 8b75ec 3bf3 74d8 } // n = 5, score = 800 // 52 | push edx // ff15???????? | // 8b75ec | mov esi, dword ptr [ebp - 0x14] // 3bf3 | cmp esi, ebx // 74d8 | je 0xffffffda $sequence_13 = { 85c0 7436 8b3d???????? 68???????? 56 } // n = 5, score = 800 // 85c0 | test eax, eax // 7436 | je 0x38 // 8b3d???????? | // 68???????? | // 56 | push esi $sequence_14 = { ffd3 99 b90a000000 f7f9 } // n = 4, score = 800 // ffd3 | call ebx // 99 | cdq // b90a000000 | mov ecx, 0xa // f7f9 | idiv ecx $sequence_15 = { e8???????? 8bf0 e8???????? 8b45f4 50 } // n = 5, score = 800 // e8???????? | // 8bf0 | mov esi, eax // e8???????? | // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 50 | push eax condition: 7 of them and filesize < 8028160 }
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