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rule win_lolsnif_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.lolsnif." 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.lolsnif" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { c745ecebfecccc 8945f8 895dfc e8???????? 85c0 0f84e6000000 c745fc10000000 } // n = 7, score = 200 // c745ecebfecccc | mov dword ptr [ebp - 0x14], 0xccccfeeb // 8945f8 | mov dword ptr [ebp - 8], eax // 895dfc | mov dword ptr [ebp - 4], ebx // e8???????? | // 85c0 | test eax, eax // 0f84e6000000 | je 0xec // c745fc10000000 | mov dword ptr [ebp - 4], 0x10 $sequence_1 = { 8d4510 50 ff35???????? e8???????? 8bf8 85ff 0f8576010000 } // n = 7, score = 200 // 8d4510 | lea eax, [ebp + 0x10] // 50 | push eax // ff35???????? | // e8???????? | // 8bf8 | mov edi, eax // 85ff | test edi, edi // 0f8576010000 | jne 0x17c $sequence_2 = { 8945fc 7460 894508 ff35???????? 8b450c ff7510 e8???????? } // n = 7, score = 200 // 8945fc | mov dword ptr [ebp - 4], eax // 7460 | je 0x62 // 894508 | mov dword ptr [ebp + 8], eax // ff35???????? | // 8b450c | mov eax, dword ptr [ebp + 0xc] // ff7510 | push dword ptr [ebp + 0x10] // e8???????? | $sequence_3 = { 6817010000 1bc0 51 23c6 50 e8???????? e9???????? } // n = 7, score = 200 // 6817010000 | push 0x117 // 1bc0 | sbb eax, eax // 51 | push ecx // 23c6 | and eax, esi // 50 | push eax // e8???????? | // e9???????? | $sequence_4 = { 3bf1 742b 53 8b5f04 } // n = 4, score = 200 // 3bf1 | cmp esi, ecx // 742b | je 0x2d // 53 | push ebx // 8b5f04 | mov ebx, dword ptr [edi + 4] $sequence_5 = { 8bf8 85ff 754c 8b45fc } // n = 4, score = 200 // 8bf8 | mov edi, eax // 85ff | test edi, edi // 754c | jne 0x4e // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_6 = { 6a20 50 ff15???????? 3bc3 0f84eb000000 68???????? 50 } // n = 7, score = 200 // 6a20 | push 0x20 // 50 | push eax // ff15???????? | // 3bc3 | cmp eax, ebx // 0f84eb000000 | je 0xf1 // 68???????? | // 50 | push eax $sequence_7 = { 8b471c 3bc3 7411 50 53 ff35???????? ff15???????? } // n = 7, score = 200 // 8b471c | mov eax, dword ptr [edi + 0x1c] // 3bc3 | cmp eax, ebx // 7411 | je 0x13 // 50 | push eax // 53 | push ebx // ff35???????? | // ff15???????? | $sequence_8 = { 85c0 0f841b020000 50 ff7320 e8???????? 8bf0 } // n = 6, score = 200 // 85c0 | test eax, eax // 0f841b020000 | je 0x221 // 50 | push eax // ff7320 | push dword ptr [ebx + 0x20] // e8???????? | // 8bf0 | mov esi, eax $sequence_9 = { bf02010000 eb08 ff15???????? 8bf8 } // n = 4, score = 200 // bf02010000 | mov edi, 0x102 // eb08 | jmp 0xa // ff15???????? | // 8bf8 | mov edi, eax condition: 7 of them and filesize < 425984 }
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