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rule win_lolsnif_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 894c240c eb4a e8???????? 85f6 7522 83f802 } // n = 6, score = 200 // 894c240c | mov dword ptr [esp + 0xc], ecx // eb4a | jmp 0x4c // e8???????? | // 85f6 | test esi, esi // 7522 | jne 0x24 // 83f802 | cmp eax, 2 $sequence_1 = { ff4c2408 75ee 5e c20800 55 8bec 83ec14 } // n = 7, score = 200 // ff4c2408 | dec dword ptr [esp + 8] // 75ee | jne 0xfffffff0 // 5e | pop esi // c20800 | ret 8 // 55 | push ebp // 8bec | mov ebp, esp // 83ec14 | sub esp, 0x14 $sequence_2 = { 6aff 8945f0 57 8d45ec 50 6a02 895dec } // n = 7, score = 200 // 6aff | push -1 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 57 | push edi // 8d45ec | lea eax, [ebp - 0x14] // 50 | push eax // 6a02 | push 2 // 895dec | mov dword ptr [ebp - 0x14], ebx $sequence_3 = { 53 57 ff35???????? ff15???????? 397df8 7528 } // n = 6, score = 200 // 53 | push ebx // 57 | push edi // ff35???????? | // ff15???????? | // 397df8 | cmp dword ptr [ebp - 8], edi // 7528 | jne 0x2a $sequence_4 = { 8bec 83ec0c 56 8d45f4 50 e8???????? } // n = 6, score = 200 // 8bec | mov ebp, esp // 83ec0c | sub esp, 0xc // 56 | push esi // 8d45f4 | lea eax, [ebp - 0xc] // 50 | push eax // e8???????? | $sequence_5 = { 8b33 e8???????? 8b7304 e8???????? 8b7308 e8???????? 8b433c } // n = 7, score = 200 // 8b33 | mov esi, dword ptr [ebx] // e8???????? | // 8b7304 | mov esi, dword ptr [ebx + 4] // e8???????? | // 8b7308 | mov esi, dword ptr [ebx + 8] // e8???????? | // 8b433c | mov eax, dword ptr [ebx + 0x3c] $sequence_6 = { 3d0c293b74 741a 3d6c42a07c 0f8523030000 ff7508 } // n = 5, score = 200 // 3d0c293b74 | cmp eax, 0x743b290c // 741a | je 0x1c // 3d6c42a07c | cmp eax, 0x7ca0426c // 0f8523030000 | jne 0x329 // ff7508 | push dword ptr [ebp + 8] $sequence_7 = { 8944242c c744242408000000 ff15???????? 85c0 89442410 } // n = 5, score = 200 // 8944242c | mov dword ptr [esp + 0x2c], eax // c744242408000000 | mov dword ptr [esp + 0x24], 8 // ff15???????? | // 85c0 | test eax, eax // 89442410 | mov dword ptr [esp + 0x10], eax $sequence_8 = { c745e801000000 c745ec10270000 c745f0e8030000 c745f4e0930400 e8???????? 8bf0 } // n = 6, score = 200 // c745e801000000 | mov dword ptr [ebp - 0x18], 1 // c745ec10270000 | mov dword ptr [ebp - 0x14], 0x2710 // c745f0e8030000 | mov dword ptr [ebp - 0x10], 0x3e8 // c745f4e0930400 | mov dword ptr [ebp - 0xc], 0x493e0 // e8???????? | // 8bf0 | mov esi, eax $sequence_9 = { 53 8d4508 50 e8???????? ff7508 ffd6 ff7508 } // n = 7, score = 200 // 53 | push ebx // 8d4508 | lea eax, [ebp + 8] // 50 | push eax // e8???????? | // ff7508 | push dword ptr [ebp + 8] // ffd6 | call esi // ff7508 | push dword ptr [ebp + 8] condition: 7 of them and filesize < 425984 }
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