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rule win_red_gambler_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 807e01a2 7535 807e02c3 752f 68???????? 68???????? ff15???????? } // n = 7, score = 400 // 807e01a2 | cmp byte ptr [esi + 1], 0xa2 // 7535 | jne 0x37 // 807e02c3 | cmp byte ptr [esi + 2], 0xc3 // 752f | jne 0x31 // 68???????? | // 68???????? | // ff15???????? | $sequence_1 = { 68???????? c745ece80f13fc ffd6 a3???????? } // n = 4, score = 400 // 68???????? | // c745ece80f13fc | mov dword ptr [ebp - 0x14], 0xfc130fe8 // ffd6 | call esi // a3???????? | $sequence_2 = { 68ff000000 8d8df0fcffff 51 ff15???????? 85c0 } // n = 5, score = 400 // 68ff000000 | push 0xff // 8d8df0fcffff | lea ecx, [ebp - 0x310] // 51 | push ecx // ff15???????? | // 85c0 | test eax, eax $sequence_3 = { 3bf1 72bf 5e 33c0 5b } // n = 5, score = 400 // 3bf1 | cmp esi, ecx // 72bf | jb 0xffffffc1 // 5e | pop esi // 33c0 | xor eax, eax // 5b | pop ebx $sequence_4 = { e8???????? 8bf8 83c404 83ffff 74e1 57 8d4c244c } // n = 7, score = 400 // e8???????? | // 8bf8 | mov edi, eax // 83c404 | add esp, 4 // 83ffff | cmp edi, -1 // 74e1 | je 0xffffffe3 // 57 | push edi // 8d4c244c | lea ecx, [esp + 0x4c] $sequence_5 = { 8d4c2414 51 6a40 6a07 } // n = 4, score = 400 // 8d4c2414 | lea ecx, [esp + 0x14] // 51 | push ecx // 6a40 | push 0x40 // 6a07 | push 7 $sequence_6 = { 68???????? 68???????? ffd6 5e 85c0 7505 } // n = 6, score = 400 // 68???????? | // 68???????? | // ffd6 | call esi // 5e | pop esi // 85c0 | test eax, eax // 7505 | jne 7 $sequence_7 = { 894dec 8955f0 8945f4 ff15???????? } // n = 4, score = 400 // 894dec | mov dword ptr [ebp - 0x14], ecx // 8955f0 | mov dword ptr [ebp - 0x10], edx // 8945f4 | mov dword ptr [ebp - 0xc], eax // ff15???????? | $sequence_8 = { 2b2a bee7eee947 7c26 0e } // n = 4, score = 300 // 2b2a | sub ebp, dword ptr [edx] // bee7eee947 | mov esi, 0x47e9eee7 // 7c26 | jl 0x28 // 0e | push cs $sequence_9 = { 8d4d98 51 ff15???????? 8d5598 52 8d8598fdffff } // n = 6, score = 300 // 8d4d98 | lea ecx, [ebp - 0x68] // 51 | push ecx // ff15???????? | // 8d5598 | lea edx, [ebp - 0x68] // 52 | push edx // 8d8598fdffff | lea eax, [ebp - 0x268] $sequence_10 = { 7456 7b78 cd50 d46e } // n = 4, score = 300 // 7456 | je 0x58 // 7b78 | jnp 0x7a // cd50 | int 0x50 // d46e | aam 0x6e $sequence_11 = { bc340e65bc 691fd8727fcf 14cf fd } // n = 4, score = 300 // bc340e65bc | mov esp, 0xbc650e34 // 691fd8727fcf | imul ebx, dword ptr [edi], 0xcf7f72d8 // 14cf | adc al, 0xcf // fd | std $sequence_12 = { 9e e779 9e 54 } // n = 4, score = 300 // 9e | sahf // e779 | out 0x79, eax // 9e | sahf // 54 | push esp $sequence_13 = { 51 ff15???????? 83c414 6a00 6a00 8d9598fbffff } // n = 6, score = 300 // 51 | push ecx // ff15???????? | // 83c414 | add esp, 0x14 // 6a00 | push 0 // 6a00 | push 0 // 8d9598fbffff | lea edx, [ebp - 0x468] $sequence_14 = { ff15???????? 6800010000 8d8d98fdffff 51 8d9598feffff 52 } // n = 6, score = 300 // ff15???????? | // 6800010000 | push 0x100 // 8d8d98fdffff | lea ecx, [ebp - 0x268] // 51 | push ecx // 8d9598feffff | lea edx, [ebp - 0x168] // 52 | push edx $sequence_15 = { 52 8d8598fdffff 50 68???????? } // n = 4, score = 300 // 52 | push edx // 8d8598fdffff | lea eax, [ebp - 0x268] // 50 | push eax // 68???????? | $sequence_16 = { 3c3d 9e e7bd e600 3e3e25162f062d } // n = 5, score = 300 // 3c3d | cmp al, 0x3d // 9e | sahf // e7bd | out 0xbd, eax // e600 | out 0, al // 3e3e25162f062d | and eax, 0x2d062f16 $sequence_17 = { 6a00 6a00 8d9598fbffff 52 68???????? 6a00 6a00 } // n = 7, score = 300 // 6a00 | push 0 // 6a00 | push 0 // 8d9598fbffff | lea edx, [ebp - 0x468] // 52 | push edx // 68???????? | // 6a00 | push 0 // 6a00 | push 0 $sequence_18 = { 50 4c 48 44 40 6c } // n = 6, score = 300 // 50 | push eax // 4c | dec esp // 48 | dec eax // 44 | inc esp // 40 | inc eax // 6c | insb byte ptr es:[edi], dx $sequence_19 = { 6800010000 8d8dfcfdffff 51 6a00 } // n = 4, score = 300 // 6800010000 | push 0x100 // 8d8dfcfdffff | lea ecx, [ebp - 0x204] // 51 | push ecx // 6a00 | push 0 $sequence_20 = { 68???????? 8d8d98fbffff 68???????? 51 ff15???????? 83c414 } // n = 6, score = 300 // 68???????? | // 8d8d98fbffff | lea ecx, [ebp - 0x468] // 68???????? | // 51 | push ecx // ff15???????? | // 83c414 | add esp, 0x14 $sequence_21 = { 7c0e 07 642827 3ccf } // n = 4, score = 300 // 7c0e | jl 0x10 // 07 | pop es // 642827 | sub byte ptr fs:[edi], ah // 3ccf | cmp al, 0xcf $sequence_22 = { 8d9598feffff 52 ff15???????? 8d8594fbffff 50 8d4d98 51 } // n = 7, score = 300 // 8d9598feffff | lea edx, [ebp - 0x168] // 52 | push edx // ff15???????? | // 8d8594fbffff | lea eax, [ebp - 0x46c] // 50 | push eax // 8d4d98 | lea ecx, [ebp - 0x68] // 51 | push ecx $sequence_23 = { 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_24 = { 2f 74be 6f 665b } // n = 4, score = 300 // 2f | das // 74be | je 0xffffffc0 // 6f | outsd dx, dword ptr [esi] // 665b | pop bx $sequence_25 = { 68???????? ff15???????? 8b7508 c7465c486b4000 83660800 } // n = 5, score = 100 // 68???????? | // ff15???????? | // 8b7508 | mov esi, dword ptr [ebp + 8] // c7465c486b4000 | mov dword ptr [esi + 0x5c], 0x406b48 // 83660800 | and dword ptr [esi + 8], 0 $sequence_26 = { 6888130000 ffd7 6800010000 8d95fcfeffff } // n = 4, score = 100 // 6888130000 | push 0x1388 // ffd7 | call edi // 6800010000 | push 0x100 // 8d95fcfeffff | lea edx, [ebp - 0x104] $sequence_27 = { 55 8bec 8b4508 ff34c5d0814000 } // n = 4, score = 100 // 55 | push ebp // 8bec | mov ebp, esp // 8b4508 | mov eax, dword ptr [ebp + 8] // ff34c5d0814000 | push dword ptr [eax*8 + 0x4081d0] $sequence_28 = { 8bf8 ffd3 8bd8 ffd7 8b3d???????? 6aff ffd7 } // n = 7, score = 100 // 8bf8 | mov edi, eax // ffd3 | call ebx // 8bd8 | mov ebx, eax // ffd7 | call edi // 8b3d???????? | // 6aff | push -1 // ffd7 | call edi $sequence_29 = { 83f805 7d10 668b4c4310 66890c4580974000 40 ebe8 } // n = 6, 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 // ebe8 | jmp 0xffffffea $sequence_30 = { 6a5c 8d8dfcfeffff 51 ff15???????? } // n = 4, score = 100 // 6a5c | push 0x5c // 8d8dfcfeffff | lea ecx, [ebp - 0x104] // 51 | push ecx // ff15???????? | $sequence_31 = { 8bec 8b4508 33c9 3b04cd10804000 } // n = 4, score = 100 // 8bec | mov ebp, esp // 8b4508 | mov eax, dword ptr [ebp + 8] // 33c9 | xor ecx, ecx // 3b04cd10804000 | cmp eax, dword ptr [ecx*8 + 0x408010] condition: 7 of them and filesize < 327680 }
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