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rule win_lolsnif_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 8d4508 50 ff7508 e8???????? 85c0 7505 894508 } // n = 7, score = 200 // 8d4508 | lea eax, [ebp + 8] // 50 | push eax // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 85c0 | test eax, eax // 7505 | jne 7 // 894508 | mov dword ptr [ebp + 8], eax $sequence_1 = { 8b45f8 5f 5e 5b c9 c21000 ff742404 } // n = 7, score = 200 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 5f | pop edi // 5e | pop esi // 5b | pop ebx // c9 | leave // c21000 | ret 0x10 // ff742404 | push dword ptr [esp + 4] $sequence_2 = { ab 0f8497000000 381e 0f848f000000 395d14 8b3d???????? 8b1d???????? } // n = 7, score = 200 // ab | stosd dword ptr es:[edi], eax // 0f8497000000 | je 0x9d // 381e | cmp byte ptr [esi], bl // 0f848f000000 | je 0x95 // 395d14 | cmp dword ptr [ebp + 0x14], ebx // 8b3d???????? | // 8b1d???????? | $sequence_3 = { 53 ff742418 ff15???????? 85c0 7526 ff35???????? 8d442454 } // n = 7, score = 200 // 53 | push ebx // ff742418 | push dword ptr [esp + 0x18] // ff15???????? | // 85c0 | test eax, eax // 7526 | jne 0x28 // ff35???????? | // 8d442454 | lea eax, [esp + 0x54] $sequence_4 = { 85c0 8945fc 0f8557010000 a1???????? 8b75f4 35bbb19fde } // n = 6, score = 200 // 85c0 | test eax, eax // 8945fc | mov dword ptr [ebp - 4], eax // 0f8557010000 | jne 0x15d // a1???????? | // 8b75f4 | mov esi, dword ptr [ebp - 0xc] // 35bbb19fde | xor eax, 0xde9fb1bb $sequence_5 = { ab ab 895c240c ab 0f8497000000 381e } // n = 6, score = 200 // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // 895c240c | mov dword ptr [esp + 0xc], ebx // ab | stosd dword ptr es:[edi], eax // 0f8497000000 | je 0x9d // 381e | cmp byte ptr [esi], bl $sequence_6 = { a3???????? 0f84a2010000 897004 bd???????? 33c9 8930 8bc5 } // n = 7, score = 200 // a3???????? | // 0f84a2010000 | je 0x1a8 // 897004 | mov dword ptr [eax + 4], esi // bd???????? | // 33c9 | xor ecx, ecx // 8930 | mov dword ptr [eax], esi // 8bc5 | mov eax, ebp $sequence_7 = { 81f94f503a00 750f 813d????????141eeae3 7519 83c003 803821 } // n = 6, score = 200 // 81f94f503a00 | cmp ecx, 0x3a504f // 750f | jne 0x11 // 813d????????141eeae3 | // 7519 | jne 0x1b // 83c003 | add eax, 3 // 803821 | cmp byte ptr [eax], 0x21 $sequence_8 = { 0f84fe030000 68???????? ff15???????? e9???????? 6a02 } // n = 5, score = 200 // 0f84fe030000 | je 0x404 // 68???????? | // ff15???????? | // e9???????? | // 6a02 | push 2 $sequence_9 = { 85c0 0f8489000000 e8???????? 85c0 7431 e8???????? 85c0 } // n = 7, score = 200 // 85c0 | test eax, eax // 0f8489000000 | je 0x8f // e8???????? | // 85c0 | test eax, eax // 7431 | je 0x33 // e8???????? | // 85c0 | test eax, eax condition: 7 of them and filesize < 425984 }
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