rule win_icedid_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-09-17" version = "1" description = "Detects win.icedid." 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.icedid" 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 = { 7427 6a3b 56 ff15???????? 8bf8 } // n = 5, score = 1300 // 7427 | je 0x29 // 6a3b | push 0x3b // 56 | push esi // ff15???????? | // 8bf8 | mov edi, eax $sequence_1 = { ff15???????? 85c0 7420 837c241000 } // n = 4, score = 1300 // ff15???????? | // 85c0 | test eax, eax // 7420 | je 0x22 // 837c241000 | cmp dword ptr [esp + 0x10], 0 $sequence_2 = { 50 0fb705???????? 50 51 0fb60d???????? } // n = 5, score = 1300 // 50 | push eax // 0fb705???????? | // 50 | push eax // 51 | push ecx // 0fb60d???????? | $sequence_3 = { 85c0 7511 56 57 ff15???????? } // n = 5, score = 1300 // 85c0 | test eax, eax // 7511 | jne 0x13 // 56 | push esi // 57 | push edi // ff15???????? | $sequence_4 = { 6905????????e8030000 50 ff35???????? ff15???????? } // n = 4, score = 1300 // 6905????????e8030000 | // 50 | push eax // ff35???????? | // ff15???????? | $sequence_5 = { 7413 ff36 6a08 ff15???????? 50 } // n = 5, score = 1300 // 7413 | je 0x15 // ff36 | push dword ptr [esi] // 6a08 | push 8 // ff15???????? | // 50 | push eax $sequence_6 = { ff15???????? 8bf7 8bc6 eb02 33c0 } // n = 5, score = 1300 // ff15???????? | // 8bf7 | mov esi, edi // 8bc6 | mov eax, esi // eb02 | jmp 4 // 33c0 | xor eax, eax $sequence_7 = { be01000080 50 56 ff15???????? } // n = 4, score = 1300 // be01000080 | mov esi, 0x80000001 // 50 | push eax // 56 | push esi // ff15???????? | $sequence_8 = { e8???????? 8bf0 8d45fc 50 ff75fc 6a05 } // n = 6, score = 1000 // e8???????? | // 8bf0 | mov esi, eax // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // ff75fc | push dword ptr [ebp - 4] // 6a05 | push 5 $sequence_9 = { 8d5b11 83c414 47 3b7820 72d1 } // n = 5, score = 800 // 8d5b11 | lea ebx, [ebx + 0x11] // 83c414 | add esp, 0x14 // 47 | inc edi // 3b7820 | cmp edi, dword ptr [eax + 0x20] // 72d1 | jb 0xffffffd3 $sequence_10 = { 8d6af8 d1ed 6a00 5f 743f 8d5808 } // n = 6, score = 800 // 8d6af8 | lea ebp, [edx - 8] // d1ed | shr ebp, 1 // 6a00 | push 0 // 5f | pop edi // 743f | je 0x41 // 8d5808 | lea ebx, [eax + 8] $sequence_11 = { 3bfd 72c4 8b542414 0302 } // n = 4, score = 800 // 3bfd | cmp edi, ebp // 72c4 | jb 0xffffffc6 // 8b542414 | mov edx, dword ptr [esp + 0x14] // 0302 | add eax, dword ptr [edx] $sequence_12 = { 03c2 eb5c 8d5004 89542414 } // n = 4, score = 800 // 03c2 | add eax, edx // eb5c | jmp 0x5e // 8d5004 | lea edx, [eax + 4] // 89542414 | mov dword ptr [esp + 0x14], edx $sequence_13 = { 57 33ff 397820 7633 53 8bdf } // n = 6, score = 800 // 57 | push edi // 33ff | xor edi, edi // 397820 | cmp dword ptr [eax + 0x20], edi // 7633 | jbe 0x35 // 53 | push ebx // 8bdf | mov ebx, edi $sequence_14 = { 8d4508 50 0fb6440b34 50 ff740b28 8b440b24 } // n = 6, score = 800 // 8d4508 | lea eax, [ebp + 8] // 50 | push eax // 0fb6440b34 | movzx eax, byte ptr [ebx + ecx + 0x34] // 50 | push eax // ff740b28 | push dword ptr [ebx + ecx + 0x28] // 8b440b24 | mov eax, dword ptr [ebx + ecx + 0x24] $sequence_15 = { 8d5004 89542414 8b12 85d2 7454 8d6af8 } // n = 6, score = 800 // 8d5004 | lea edx, [eax + 4] // 89542414 | mov dword ptr [esp + 0x14], edx // 8b12 | mov edx, dword ptr [edx] // 85d2 | test edx, edx // 7454 | je 0x56 // 8d6af8 | lea ebp, [edx - 8] $sequence_16 = { ff15???????? 85c0 750a b8010000c0 e9???????? } // n = 5, score = 400 // ff15???????? | // 85c0 | test eax, eax // 750a | jne 0xc // b8010000c0 | mov eax, 0xc0000001 // e9???????? | $sequence_17 = { ff5010 85c0 7407 33c0 } // n = 4, score = 400 // ff5010 | call dword ptr [eax + 0x10] // 85c0 | test eax, eax // 7407 | je 9 // 33c0 | xor eax, eax $sequence_18 = { 8a4173 a808 75f5 a804 7406 } // n = 5, score = 400 // 8a4173 | mov al, byte ptr [ecx + 0x73] // a808 | test al, 8 // 75f5 | jne 0xfffffff7 // a804 | test al, 4 // 7406 | je 8 $sequence_19 = { 44 886b05 41 2ac7 41 02fd } // n = 6, score = 200 // 44 | inc esp // 886b05 | mov byte ptr [ebx + 5], ch // 41 | inc ecx // 2ac7 | sub al, bh // 41 | inc ecx // 02fd | add bh, ch $sequence_20 = { 48 85d2 0f8422020000 33d2 } // n = 4, score = 200 // 48 | dec eax // 85d2 | test edx, edx // 0f8422020000 | je 0x228 // 33d2 | xor edx, edx $sequence_21 = { 89433c 48 85c0 744e 41 } // n = 5, score = 200 // 89433c | mov dword ptr [ebx + 0x3c], eax // 48 | dec eax // 85c0 | test eax, eax // 744e | je 0x50 // 41 | inc ecx $sequence_22 = { 8d429c 49 03f9 48 8d6f16 48 8bcd } // n = 7, score = 200 // 8d429c | lea eax, [edx - 0x64] // 49 | dec ecx // 03f9 | add edi, ecx // 48 | dec eax // 8d6f16 | lea ebp, [edi + 0x16] // 48 | dec eax // 8bcd | mov ecx, ebp $sequence_23 = { 0fb64303 45 33c9 8b4858 8b4304 894de0 0fb74b02 } // n = 7, score = 200 // 0fb64303 | movzx eax, byte ptr [ebx + 3] // 45 | inc ebp // 33c9 | xor ecx, ecx // 8b4858 | mov ecx, dword ptr [eax + 0x58] // 8b4304 | mov eax, dword ptr [ebx + 4] // 894de0 | mov dword ptr [ebp - 0x20], ecx // 0fb74b02 | movzx ecx, word ptr [ebx + 2] $sequence_24 = { 74e4 4533c9 48895c2420 4533c0 33c9 418d511a ff15???????? } // n = 7, score = 100 // 74e4 | mov edi, eax // 4533c9 | inc edi // 48895c2420 | cmp edi, dword ptr [ebx + 0x1c] // 4533c0 | jb 0xffffffd9 // 33c9 | mov eax, dword ptr [ebx + 0xc] // 418d511a | dec eax // ff15???????? | $sequence_25 = { ff15???????? 4c8bc3 33d2 488bc8 ff15???????? 488bb590020000 4885f6 } // n = 7, score = 100 // ff15???????? | // 4c8bc3 | dec esp // 33d2 | mov eax, ebx // 488bc8 | xor edx, edx // ff15???????? | // 488bb590020000 | dec eax // 4885f6 | mov ecx, eax $sequence_26 = { 4883ff04 0f8210010000 4883ef04 48897c2430 4885db } // n = 5, score = 100 // 4883ff04 | xor ecx, ecx // 0f8210010000 | inc ecx // 4883ef04 | lea edx, [ecx + 0x1a] // 48897c2430 | jne 6 // 4885db | xor eax, eax $sequence_27 = { 741e 498b1f 4885db 7414 ff15???????? 4c8bc3 } // n = 6, score = 100 // 741e | dec eax // 498b1f | mov esi, dword ptr [ebp + 0x290] // 4885db | dec eax // 7414 | test esi, esi // ff15???????? | // 4c8bc3 | je 0x20 $sequence_28 = { 488bf2 488bd9 ff15???????? 4885c0 7504 } // n = 5, score = 100 // 488bf2 | dec ecx // 488bd9 | mov ebx, dword ptr [edi] // ff15???????? | // 4885c0 | dec eax // 7504 | test ebx, ebx $sequence_29 = { 7504 33c0 eb7e 488d15550d0000 488bc8 ff15???????? 488bf8 } // n = 7, score = 100 // 7504 | test eax, eax // 33c0 | jne 9 // eb7e | inc esp // 488d15550d0000 | cmp ecx, ecx // 488bc8 | je 0x5d // ff15???????? | // 488bf8 | inc ebp $sequence_30 = { 443bc9 7458 4585d2 7420 } // n = 4, score = 100 // 443bc9 | je 0x19 // 7458 | dec esp // 4585d2 | mov eax, ebx // 7420 | dec eax $sequence_31 = { ff15???????? ffc7 3b7b1c 72d7 8b430c 4803c6 0f845affffff } // n = 7, score = 100 // ff15???????? | // ffc7 | test edx, edx // 3b7b1c | je 0x25 // 72d7 | dec eax // 8b430c | mov dword ptr [esp + 0x20], ebx // 4803c6 | inc ebp // 0f845affffff | xor eax, eax condition: 7 of them and filesize < 303104 }