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rule win_darkpink_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.darkpink." 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.darkpink" 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 = { 8b048d442a4000 ffe0 f7c703000000 7413 } // n = 4, score = 200 // 8b048d442a4000 | mov eax, dword ptr [ecx*4 + 0x402a44] // ffe0 | jmp eax // f7c703000000 | test edi, 3 // 7413 | je 0x15 $sequence_1 = { 57 50 683f000f00 6a00 68???????? 6801000080 } // n = 6, score = 200 // 57 | push edi // 50 | push eax // 683f000f00 | push 0xf003f // 6a00 | push 0 // 68???????? | // 6801000080 | push 0x80000001 $sequence_2 = { c3 c705????????08924100 b001 c3 68???????? e8???????? c70424???????? } // n = 7, score = 200 // c3 | ret // c705????????08924100 | // b001 | mov al, 1 // c3 | ret // 68???????? | // e8???????? | // c70424???????? | $sequence_3 = { 8d41fc 50 56 57 e8???????? 57 } // n = 6, score = 200 // 8d41fc | lea eax, [ecx - 4] // 50 | push eax // 56 | push esi // 57 | push edi // e8???????? | // 57 | push edi $sequence_4 = { 8b85b0f8ffff 0fb70485c43c4100 8d0485c0334100 50 8d8590faffff 03c7 50 } // n = 7, score = 200 // 8b85b0f8ffff | mov eax, dword ptr [ebp - 0x750] // 0fb70485c43c4100 | movzx eax, word ptr [eax*4 + 0x413cc4] // 8d0485c0334100 | lea eax, [eax*4 + 0x4133c0] // 50 | push eax // 8d8590faffff | lea eax, [ebp - 0x570] // 03c7 | add eax, edi // 50 | push eax $sequence_5 = { 33f6 8b86f09d4100 85c0 740e } // n = 4, score = 200 // 33f6 | xor esi, esi // 8b86f09d4100 | mov eax, dword ptr [esi + 0x419df0] // 85c0 | test eax, eax // 740e | je 0x10 $sequence_6 = { 68???????? ff75f4 ffd6 85c0 0f85ca000000 50 8d45f8 } // n = 7, score = 200 // 68???????? | // ff75f4 | push dword ptr [ebp - 0xc] // ffd6 | call esi // 85c0 | test eax, eax // 0f85ca000000 | jne 0xd0 // 50 | push eax // 8d45f8 | lea eax, [ebp - 8] $sequence_7 = { 8b0495f09d4100 f644082801 7421 57 } // n = 4, score = 200 // 8b0495f09d4100 | mov eax, dword ptr [edx*4 + 0x419df0] // f644082801 | test byte ptr [eax + ecx + 0x28], 1 // 7421 | je 0x23 // 57 | push edi $sequence_8 = { e8???????? 6a44 8d45ac 6a00 50 } // n = 5, score = 200 // e8???????? | // 6a44 | push 0x44 // 8d45ac | lea eax, [ebp - 0x54] // 6a00 | push 0 // 50 | push eax $sequence_9 = { 6a26 58 0fb60c85c63c4100 0fb63485c73c4100 8bf9 8985b0f8ffff c1e702 } // n = 7, score = 200 // 6a26 | push 0x26 // 58 | pop eax // 0fb60c85c63c4100 | movzx ecx, byte ptr [eax*4 + 0x413cc6] // 0fb63485c73c4100 | movzx esi, byte ptr [eax*4 + 0x413cc7] // 8bf9 | mov edi, ecx // 8985b0f8ffff | mov dword ptr [ebp - 0x750], eax // c1e702 | shl edi, 2 condition: 7 of them and filesize < 237568 }
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