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rule win_adylkuzz_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.adylkuzz." 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.adylkuzz" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { f8 81ed02000000 663bdc f5 6689442500 81ee04000000 660fa3f8 } // n = 7, score = 100 // f8 | clc // 81ed02000000 | sub ebp, 2 // 663bdc | cmp bx, sp // f5 | cmc // 6689442500 | mov word ptr [ebp], ax // 81ee04000000 | sub esi, 4 // 660fa3f8 | bt ax, di $sequence_1 = { c744240800000000 c7442404???????? 891c24 e8???????? 85c0 7513 83c42c } // n = 7, score = 100 // c744240800000000 | mov dword ptr [esp + 8], 0 // c7442404???????? | // 891c24 | mov dword ptr [esp], ebx // e8???????? | // 85c0 | test eax, eax // 7513 | jne 0x15 // 83c42c | add esp, 0x2c $sequence_2 = { eb86 b801000000 d3e0 a90080e101 7509 a801 74e7 } // n = 7, score = 100 // eb86 | jmp 0xffffff88 // b801000000 | mov eax, 1 // d3e0 | shl eax, cl // a90080e101 | test eax, 0x1e18000 // 7509 | jne 0xb // a801 | test al, 1 // 74e7 | je 0xffffffe9 $sequence_3 = { f7c4b64da62b 663bfd 66f7d0 3bf0 f8 66f7d1 3be0 } // n = 7, score = 100 // f7c4b64da62b | test esp, 0x2ba64db6 // 663bfd | cmp di, bp // 66f7d0 | not ax // 3bf0 | cmp esi, eax // f8 | clc // 66f7d1 | not cx // 3be0 | cmp esp, eax $sequence_4 = { f9 f7d0 2d064cd540 c1c002 6681fe3d41 f8 33d8 } // n = 7, score = 100 // f9 | stc // f7d0 | not eax // 2d064cd540 | sub eax, 0x40d54c06 // c1c002 | rol eax, 2 // 6681fe3d41 | cmp si, 0x413d // f8 | clc // 33d8 | xor ebx, eax $sequence_5 = { e8???????? 8d85d4fdffff c7442404ffffffff 893424 89442408 e8???????? 83bdd4fdffff00 } // n = 7, score = 100 // e8???????? | // 8d85d4fdffff | lea eax, [ebp - 0x22c] // c7442404ffffffff | mov dword ptr [esp + 4], 0xffffffff // 893424 | mov dword ptr [esp], esi // 89442408 | mov dword ptr [esp + 8], eax // e8???????? | // 83bdd4fdffff00 | cmp dword ptr [ebp - 0x22c], 0 $sequence_6 = { 8b4310 8944241c 8d04f8 89c2 89442414 8a4374 88c1 } // n = 7, score = 100 // 8b4310 | mov eax, dword ptr [ebx + 0x10] // 8944241c | mov dword ptr [esp + 0x1c], eax // 8d04f8 | lea eax, [eax + edi*8] // 89c2 | mov edx, eax // 89442414 | mov dword ptr [esp + 0x14], eax // 8a4374 | mov al, byte ptr [ebx + 0x74] // 88c1 | mov cl, al $sequence_7 = { eb0c 3d793c2d66 740b 3d63e43ee3 7404 31d2 eb05 } // n = 7, score = 100 // eb0c | jmp 0xe // 3d793c2d66 | cmp eax, 0x662d3c79 // 740b | je 0xd // 3d63e43ee3 | cmp eax, 0xe33ee463 // 7404 | je 6 // 31d2 | xor edx, edx // eb05 | jmp 7 $sequence_8 = { d9dd 60 6e f6ef 14df 4b 5f } // n = 7, score = 100 // d9dd | fstpnce st(5), st(0) // 60 | pushal // 6e | outsb dx, byte ptr [esi] // f6ef | imul bh // 14df | adc al, 0xdf // 4b | dec ebx // 5f | pop edi $sequence_9 = { 891c24 89c1 89fa 89f0 e8???????? 83c42c 5b } // n = 7, score = 100 // 891c24 | mov dword ptr [esp], ebx // 89c1 | mov ecx, eax // 89fa | mov edx, edi // 89f0 | mov eax, esi // e8???????? | // 83c42c | add esp, 0x2c // 5b | pop ebx condition: 7 of them and filesize < 6438912 }
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