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rule win_red_gambler_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-09-17" version = "1" description = "Detects win.red_gambler." 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.red_gambler" malpedia_rule_date = "20260916" malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6" malpedia_version = "20260917" 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 = { 742b 8b55ec 8a45f0 8916 6a00 884604 } // n = 6, score = 400 // 742b | je 0x2d // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 8a45f0 | mov al, byte ptr [ebp - 0x10] // 8916 | mov dword ptr [esi], edx // 6a00 | push 0 // 884604 | mov byte ptr [esi + 4], al $sequence_1 = { 8d45fc 50 ff15???????? e8???????? 83c404 } // n = 5, score = 400 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // ff15???????? | // e8???????? | // 83c404 | add esp, 4 $sequence_2 = { 57 68???????? c745ece80f13fc ffd6 a3???????? 85c0 751a } // n = 7, score = 400 // 57 | push edi // 68???????? | // c745ece80f13fc | mov dword ptr [ebp - 0x14], 0xfc130fe8 // ffd6 | call esi // a3???????? | // 85c0 | test eax, eax // 751a | jne 0x1c $sequence_3 = { 85c0 74e5 50 8d54244c 68???????? 52 } // n = 6, score = 400 // 85c0 | test eax, eax // 74e5 | je 0xffffffe7 // 50 | push eax // 8d54244c | lea edx, [esp + 0x4c] // 68???????? | // 52 | push edx $sequence_4 = { 8d7c0704 8d85f0fdffff 68???????? 50 } // n = 4, score = 400 // 8d7c0704 | lea edi, [edi + eax + 4] // 8d85f0fdffff | lea eax, [ebp - 0x210] // 68???????? | // 50 | push eax $sequence_5 = { 8d45e8 50 6a40 ba???????? } // n = 4, score = 400 // 8d45e8 | lea eax, [ebp - 0x18] // 50 | push eax // 6a40 | push 0x40 // ba???????? | $sequence_6 = { 61 8b35???????? 81c610200000 ffd6 } // n = 4, score = 400 // 61 | popal // 8b35???????? | // 81c610200000 | add esi, 0x2010 // ffd6 | call esi $sequence_7 = { 8d8dfcfbffff 51 ffd7 33c9 } // n = 4, score = 400 // 8d8dfcfbffff | lea ecx, [ebp - 0x404] // 51 | push ecx // ffd7 | call edi // 33c9 | xor ecx, ecx $sequence_8 = { 7ea2 bba7bc3d96 21903e461ca7 bb7a77149f 57 5f 5f } // n = 7, score = 300 // 7ea2 | jle 0xffffffa4 // bba7bc3d96 | mov ebx, 0x963dbca7 // 21903e461ca7 | and dword ptr [eax - 0x58e3b9c2], edx // bb7a77149f | mov ebx, 0x9f14777a // 57 | push edi // 5f | pop edi // 5f | pop edi $sequence_9 = { 6800010000 8d8dfcfdffff 51 6a00 } // n = 4, score = 300 // 6800010000 | push 0x100 // 8d8dfcfdffff | lea ecx, [ebp - 0x204] // 51 | push ecx // 6a00 | push 0 $sequence_10 = { 69734514aba821 e8???????? 842a 06 7f6f c8603a0c } // n = 6, score = 300 // 69734514aba821 | imul esi, dword ptr [ebx + 0x45], 0x21a8ab14 // e8???????? | // 842a | test byte ptr [edx], ch // 06 | push es // 7f6f | jg 0x71 // c8603a0c | enter 0x3a60, 0xc $sequence_11 = { 58 9e e779 9e 54 } // n = 5, score = 300 // // 9e | sahf // e779 | out 0x79, eax // 9e | sahf // 54 | push esp $sequence_12 = { 642827 3ccf 7bce 07 93 60 } // n = 6, score = 300 // 642827 | sub byte ptr fs:[edi], ah // 3ccf | cmp al, 0xcf // 7bce | jnp 0xffffffd0 // 07 | pop es // 93 | xchg eax, ebx // 60 | pushal $sequence_13 = { 6e 44 b11a dfaf4e71ac05 1a7d3f 7f0d } // n = 6, score = 300 // 6e | outsb dx, byte ptr [esi] // 44 | inc esp // b11a | mov cl, 0x1a // dfaf4e71ac05 | fild qword ptr [edi + 0x5ac714e] // 1a7d3f | sbb bh, byte ptr [ebp + 0x3f] // 7f0d | jg 0xf $sequence_14 = { bee7eee947 7c26 0e 6706 } // n = 4, score = 300 // bee7eee947 | mov esi, 0x47e9eee7 // 7c26 | jl 0x28 // 0e | push cs // 6706 | push es $sequence_15 = { ff15???????? 83c414 6a00 6a00 8d9598fbffff 52 68???????? } // n = 7, score = 300 // ff15???????? | // 83c414 | add esp, 0x14 // 6a00 | push 0 // 6a00 | push 0 // 8d9598fbffff | lea edx, [ebp - 0x468] // 52 | push edx // 68???????? | $sequence_16 = { 7f6f c8603a0c 7364 42 e5e1 5f } // n = 6, score = 300 // 7f6f | jg 0x71 // c8603a0c | enter 0x3a60, 0xc // 7364 | jae 0x66 // 42 | inc edx // e5e1 | in eax, 0xe1 // 5f | pop edi $sequence_17 = { 6800010000 8d85fcfeffff 50 6a00 ff15???????? } // n = 5, score = 300 // 6800010000 | push 0x100 // 8d85fcfeffff | lea eax, [ebp - 0x104] // 50 | push eax // 6a00 | push 0 // ff15???????? | $sequence_18 = { 52 8d8598fdffff 50 68???????? 8d8d98fbffff 68???????? 51 } // n = 7, score = 300 // 52 | push edx // 8d8598fdffff | lea eax, [ebp - 0x268] // 50 | push eax // 68???????? | // 8d8d98fbffff | lea ecx, [ebp - 0x468] // 68???????? | // 51 | push ecx $sequence_19 = { 8d8d98fdffff 51 8d9598feffff 52 ff15???????? 8d8594fbffff 50 } // n = 7, score = 300 // 8d8d98fdffff | lea ecx, [ebp - 0x268] // 51 | push ecx // 8d9598feffff | lea edx, [ebp - 0x168] // 52 | push edx // ff15???????? | // 8d8594fbffff | lea eax, [ebp - 0x46c] // 50 | push eax $sequence_20 = { 8d8d98fbffff 68???????? 51 ff15???????? 83c414 6a00 } // n = 6, score = 300 // 8d8d98fbffff | lea ecx, [ebp - 0x468] // 68???????? | // 51 | push ecx // ff15???????? | // 83c414 | add esp, 0x14 // 6a00 | push 0 $sequence_21 = { 54 50 4c 48 } // n = 4, score = 300 // 54 | push esp // 50 | push eax // 4c | dec esp // 48 | dec eax $sequence_22 = { ff15???????? 8d8594fbffff 50 8d4d98 51 ff15???????? } // n = 6, score = 300 // ff15???????? | // 8d8594fbffff | lea eax, [ebp - 0x46c] // 50 | push eax // 8d4d98 | lea ecx, [ebp - 0x68] // 51 | push ecx // ff15???????? | $sequence_23 = { ff15???????? 8d5598 52 8d8598fdffff } // n = 4, score = 300 // ff15???????? | // 8d5598 | lea edx, [ebp - 0x68] // 52 | push edx // 8d8598fdffff | lea eax, [ebp - 0x268] $sequence_24 = { 8d9598fbffff 52 68???????? 6a00 6a00 ff15???????? 8b4dfc } // n = 7, score = 300 // 8d9598fbffff | lea edx, [ebp - 0x468] // 52 | push edx // 68???????? | // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_25 = { 57 48 f2ae 55 ff96acd60000 09c0 7407 } // n = 7, score = 100 // 57 | push edi // 48 | dec eax // f2ae | repne scasb al, byte ptr es:[edi] // 55 | push ebp // ff96acd60000 | call dword ptr [esi + 0xd6ac] // 09c0 | or eax, eax // 7407 | je 9 $sequence_26 = { 01cf e9???????? 5e 89f7 b92d3b0000 } // n = 5, score = 100 // 01cf | add edi, ecx // e9???????? | // 5e | pop esi // 89f7 | mov edi, esi // b92d3b0000 | mov ecx, 0x3b2d $sequence_27 = { 83f805 7d10 668b4c4310 66890c4580974000 40 } // n = 5, score = 100 // 83f805 | cmp eax, 5 // 7d10 | jge 0x12 // 668b4c4310 | mov cx, word ptr [ebx + eax*2 + 0x10] // 66890c4580974000 | mov word ptr [eax*2 + 0x409780], cx // 40 | inc eax $sequence_28 = { 01f3 50 83c708 ff96a8d60000 95 } // n = 5, score = 100 // 01f3 | add ebx, esi // 50 | push eax // 83c708 | add edi, 8 // ff96a8d60000 | call dword ptr [esi + 0xd6a8] // 95 | xchg eax, ebp $sequence_29 = { e8???????? 83c414 c3 6a08 68???????? e8???????? } // n = 6, score = 100 // e8???????? | // 83c414 | add esp, 0x14 // c3 | ret // 6a08 | push 8 // 68???????? | // e8???????? | $sequence_30 = { 83c702 ebe2 8baeb0d60000 8dbe00f0ffff } // n = 4, score = 100 // 83c702 | add edi, 2 // ebe2 | jmp 0xffffffe4 // 8baeb0d60000 | mov ebp, dword ptr [esi + 0xd6b0] // 8dbe00f0ffff | lea edi, [esi - 0x1000] $sequence_31 = { 09c0 7407 8903 83c304 ebe1 ff96bcd60000 } // n = 6, score = 100 // 09c0 | or eax, eax // 7407 | je 9 // 8903 | mov dword ptr [ebx], eax // 83c304 | add ebx, 4 // ebe1 | jmp 0xffffffe3 // ff96bcd60000 | call dword ptr [esi + 0xd6bc] condition: 7 of them and filesize < 327680 }
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