Actor(s): Samurai Panda
There is no description at this point.
rule win_sykipot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.sykipot." 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.sykipot" 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 = { 8d8c2488000000 51 ffd5 68???????? 68???????? ffd3 83c408 } // n = 7, score = 200 // 8d8c2488000000 | lea ecx, [esp + 0x88] // 51 | push ecx // ffd5 | call ebp // 68???????? | // 68???????? | // ffd3 | call ebx // 83c408 | add esp, 8 $sequence_1 = { 56 c744246004000000 ffd7 8b4c244c 6a04 } // n = 5, score = 200 // 56 | push esi // c744246004000000 | mov dword ptr [esp + 0x60], 4 // ffd7 | call edi // 8b4c244c | mov ecx, dword ptr [esp + 0x4c] // 6a04 | push 4 $sequence_2 = { 50 51 8bcd e8???????? 8b13 8d442414 52 } // n = 7, score = 200 // 50 | push eax // 51 | push ecx // 8bcd | mov ecx, ebp // e8???????? | // 8b13 | mov edx, dword ptr [ebx] // 8d442414 | lea eax, [esp + 0x14] // 52 | push edx $sequence_3 = { 50 8db42498000000 83ec44 8bfc } // n = 4, score = 200 // 50 | push eax // 8db42498000000 | lea esi, [esp + 0x98] // 83ec44 | sub esp, 0x44 // 8bfc | mov edi, esp $sequence_4 = { 5d b80e000000 5b 81c45c180000 c3 56 8b35???????? } // n = 7, score = 200 // 5d | pop ebp // b80e000000 | mov eax, 0xe // 5b | pop ebx // 81c45c180000 | add esp, 0x185c // c3 | ret // 56 | push esi // 8b35???????? | $sequence_5 = { 8bcc 8911 8b94244c060000 894104 895108 8bcd } // n = 6, score = 200 // 8bcc | mov ecx, esp // 8911 | mov dword ptr [ecx], edx // 8b94244c060000 | mov edx, dword ptr [esp + 0x64c] // 894104 | mov dword ptr [ecx + 4], eax // 895108 | mov dword ptr [ecx + 8], edx // 8bcd | mov ecx, ebp $sequence_6 = { 55 56 ff15???????? 85c0 57 7513 ff15???????? } // n = 7, score = 200 // 55 | push ebp // 56 | push esi // ff15???????? | // 85c0 | test eax, eax // 57 | push edi // 7513 | jne 0x15 // ff15???????? | $sequence_7 = { bf???????? a3???????? f3ab b941000000 bf???????? f3ab b941000000 } // n = 7, score = 200 // bf???????? | // a3???????? | // f3ab | rep stosd dword ptr es:[edi], eax // b941000000 | mov ecx, 0x41 // bf???????? | // f3ab | rep stosd dword ptr es:[edi], eax // b941000000 | mov ecx, 0x41 $sequence_8 = { 83ec44 b911000000 8db424e8000000 8bfc f3a5 8bcd e8???????? } // n = 7, score = 200 // 83ec44 | sub esp, 0x44 // b911000000 | mov ecx, 0x11 // 8db424e8000000 | lea esi, [esp + 0xe8] // 8bfc | mov edi, esp // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bcd | mov ecx, ebp // e8???????? | $sequence_9 = { c24800 8b442404 56 57 } // n = 4, score = 200 // c24800 | ret 0x48 // 8b442404 | mov eax, dword ptr [esp + 4] // 56 | push esi // 57 | push edi condition: 7 of them and filesize < 286720 }
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