Actor(s): APT28
There is no description at this point.
rule win_sedreco_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-05-04" version = "1" description = "Detects win.sedreco." 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.sedreco" malpedia_rule_date = "20260422" malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14" malpedia_version = "20260504" 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 = { 55 8bec 51 836d0804 53 } // n = 5, score = 2600 // 55 | push ebp // 8bec | mov ebp, esp // 51 | push ecx // 836d0804 | sub dword ptr [ebp + 8], 4 // 53 | push ebx $sequence_1 = { 8b750c 56 e8???????? 6a08 } // n = 4, score = 2600 // 8b750c | mov esi, dword ptr [ebp + 0xc] // 56 | push esi // e8???????? | // 6a08 | push 8 $sequence_2 = { c645ff30 e8???????? 85c0 7505 e8???????? } // n = 5, score = 2600 // c645ff30 | mov byte ptr [ebp - 1], 0x30 // e8???????? | // 85c0 | test eax, eax // 7505 | jne 7 // e8???????? | $sequence_3 = { 836d0804 53 56 8b750c } // n = 4, score = 2600 // 836d0804 | sub dword ptr [ebp + 8], 4 // 53 | push ebx // 56 | push esi // 8b750c | mov esi, dword ptr [ebp + 0xc] $sequence_4 = { e8???????? 89450c 56 85c0 } // n = 4, score = 2600 // e8???????? | // 89450c | mov dword ptr [ebp + 0xc], eax // 56 | push esi // 85c0 | test eax, eax $sequence_5 = { 50 68???????? 6a0d 68???????? } // n = 4, score = 2500 // 50 | push eax // 68???????? | // 6a0d | push 0xd // 68???????? | $sequence_6 = { 51 6802020000 68???????? 50 } // n = 4, score = 2400 // 51 | push ecx // 6802020000 | push 0x202 // 68???????? | // 50 | push eax $sequence_7 = { 7ce0 a1???????? 5e 85c0 } // n = 4, score = 2400 // 7ce0 | jl 0xffffffe2 // a1???????? | // 5e | pop esi // 85c0 | test eax, eax $sequence_8 = { 7411 6a04 68???????? 68???????? } // n = 4, score = 2400 // 7411 | je 0x13 // 6a04 | push 4 // 68???????? | // 68???????? | $sequence_9 = { ffd6 8b0d???????? 89417c 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 89417c | mov dword ptr [ecx + 0x7c], eax // 85c0 | test eax, eax $sequence_10 = { ff15???????? 83c604 81fe???????? 7ce0 a1???????? } // n = 5, score = 2200 // ff15???????? | // 83c604 | add esi, 4 // 81fe???????? | // 7ce0 | jl 0xffffffe2 // a1???????? | $sequence_11 = { 83c40c b801000000 8b4df0 64890d00000000 59 5f 5e } // n = 7, score = 2200 // 83c40c | add esp, 0xc // b801000000 | mov eax, 1 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5f | pop edi // 5e | pop esi $sequence_12 = { 56 be???????? 8b06 85c0 740f 50 } // n = 6, score = 2200 // 56 | push esi // be???????? | // 8b06 | mov eax, dword ptr [esi] // 85c0 | test eax, eax // 740f | je 0x11 // 50 | push eax $sequence_13 = { ffd6 8b0d???????? 894104 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 894104 | mov dword ptr [ecx + 4], eax // 85c0 | test eax, eax $sequence_14 = { ffd6 8b0d???????? 898158010000 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 898158010000 | mov dword ptr [ecx + 0x158], eax // 85c0 | test eax, eax $sequence_15 = { 6a00 68???????? 6aff 68???????? 6a00 6a00 ffd6 } // n = 7, score = 500 // 6a00 | push esi // 68???????? | // 6aff | mov eax, dword ptr [esi] // 68???????? | // 6a00 | test eax, eax // 6a00 | je 0x13 // ffd6 | push eax $sequence_16 = { 488b05???????? ff90e8000000 488b0d???????? 488b05???????? ff5028 48c705????????00000000 } // n = 6, score = 500 // 488b05???????? | // ff90e8000000 | call dword ptr [eax + 0xe8] // 488b0d???????? | // 488b05???????? | // ff5028 | call dword ptr [eax + 0x28] // 48c705????????00000000 | $sequence_17 = { 68???????? e8???????? 8b35???????? 83c404 6a00 } // n = 5, score = 500 // 68???????? | // e8???????? | // 8b35???????? | // 83c404 | dec al // 6a00 | push ebx $sequence_18 = { 8b442458 89442428 488b442450 4889442420 41b903000000 4533c0 } // n = 6, score = 500 // 8b442458 | test eax, eax // 89442428 | xor edx, edx // 488b442450 | xor ecx, ecx // 4889442420 | call dword ptr [eax + 0xf0] // 41b903000000 | inc ebp // 4533c0 | xor ecx, ecx $sequence_19 = { 6a00 ffd6 50 68???????? 6aff 68???????? 6a00 } // n = 7, score = 500 // 6a00 | pop esi // ffd6 | test eax, eax // 50 | add esi, 4 // 68???????? | // 6aff | jl 0xffffffe2 // 68???????? | // 6a00 | pop esi $sequence_20 = { 33d2 33c9 488b05???????? ff90f0000000 488905???????? } // n = 5, score = 500 // 33d2 | xor eax, eax // 33c9 | mov edx, 0xc0000000 // 488b05???????? | // ff90f0000000 | dec eax // 488905???????? | $sequence_21 = { 4533c0 488b15???????? 48c7c101000080 488b05???????? ff9038010000 } // n = 5, score = 500 // 4533c0 | inc ebp // 488b15???????? | // 48c7c101000080 | xor eax, eax // 488b05???????? | // ff9038010000 | dec eax $sequence_22 = { 4533c9 4533c0 ba000000c0 488b0d???????? 488b05???????? } // n = 5, score = 500 // 4533c9 | call dword ptr [eax + 0xe8] // 4533c0 | mov edx, 0x2710 // ba000000c0 | inc ebp // 488b0d???????? | // 488b05???????? | $sequence_23 = { 4533c9 4533c0 33d2 488bc8 488b05???????? } // n = 5, score = 500 // 4533c9 | add eax, 0x10 // 4533c0 | dec eax // 33d2 | add esp, 0x28 // 488bc8 | ret // 488b05???????? | $sequence_24 = { 6800010000 6a00 68???????? e8???????? 6800020000 6a00 } // n = 6, score = 500 // 6800010000 | add esp, 0xc // 6a00 | mov eax, 0xeeeeeef2 // 68???????? | // e8???????? | // 6800020000 | mov ecx, dword ptr [ebp - 0x10] // 6a00 | mov dword ptr fs:[0], ecx $sequence_25 = { 488b05???????? ff90e8000000 ba10270000 488b0d???????? 488b05???????? ff5010 } // n = 6, score = 500 // 488b05???????? | // ff90e8000000 | call dword ptr [eax + 0xe8] // ba10270000 | mov edx, 0x2710 // 488b0d???????? | // 488b05???????? | // ff5010 | call dword ptr [eax + 0x10] $sequence_26 = { 4883c010 4883c428 c3 48890d???????? c3 48895c2410 } // n = 6, score = 500 // 4883c010 | xor ecx, ecx // 4883c428 | inc ebp // c3 | xor eax, eax // 48890d???????? | // c3 | mov edx, 0xc0000000 // 48895c2410 | dec eax $sequence_27 = { 7cd5 68???????? e8???????? 8b4dfc } // n = 4, score = 400 // 7cd5 | add esp, 4 // 68???????? | // e8???????? | // 8b4dfc | push 0 $sequence_28 = { ffd6 8b4dfc 5f 5e 33cd b8???????? } // n = 6, score = 400 // ffd6 | push 0 // 8b4dfc | push 0 // 5f | call esi // 5e | push eax // 33cd | call esi // b8???????? | $sequence_29 = { e8???????? 83c40c 6a01 ff15???????? ff15???????? } // n = 5, score = 300 // e8???????? | // 83c40c | push 0 // 6a01 | call esi // ff15???????? | // ff15???????? | $sequence_30 = { 7411 8a4a03 3a4803 7409 } // n = 4, score = 300 // 7411 | push -1 // 8a4a03 | push eax // 3a4803 | push -1 // 7409 | push 0 $sequence_31 = { 3a4801 751a 83fefe 741e 8a4a02 3a4802 } // n = 6, score = 300 // 3a4801 | push 0 // 751a | push eax // 83fefe | push -1 // 741e | push 0 // 8a4a02 | push 0 // 3a4802 | push -1 $sequence_32 = { 6a08 6a01 68???????? 68???????? 8d45f8 } // n = 5, score = 300 // 6a08 | push -1 // 6a01 | push 0 // 68???????? | // 68???????? | // 8d45f8 | push 0 $sequence_33 = { 68???????? e8???????? 85c0 7402 eb0d } // n = 5, score = 200 // 68???????? | // e8???????? | // 85c0 | test eax, eax // 7402 | je 4 // eb0d | jmp 0xf $sequence_34 = { 8b85ecfeffff 8b4df4 64890d00000000 5f 5e 5b } // n = 6, score = 200 // 8b85ecfeffff | mov eax, dword ptr [ebp - 0x114] // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_35 = { 57 50 ff512c 8bce 8bd8 } // n = 5, score = 200 // 57 | push edi // 50 | push eax // ff512c | call dword ptr [ecx + 0x2c] // 8bce | mov ecx, esi // 8bd8 | mov ebx, eax $sequence_36 = { ff512c 8bf0 f7de 1bf6 46 } // n = 5, score = 200 // ff512c | call dword ptr [ecx + 0x2c] // 8bf0 | mov esi, eax // f7de | neg esi // 1bf6 | sbb esi, esi // 46 | inc esi $sequence_37 = { 56 57 c785ecfeffff01000000 c785e8feffffe197af54 } // n = 4, score = 200 // 56 | push esi // 57 | push edi // c785ecfeffff01000000 | mov dword ptr [ebp - 0x114], 1 // c785e8feffffe197af54 | mov dword ptr [ebp - 0x118], 0x54af97e1 $sequence_38 = { 8bec 83ec10 53 56 57 894df0 ff15???????? } // n = 7, score = 200 // 8bec | mov ebp, esp // 83ec10 | sub esp, 0x10 // 53 | push ebx // 56 | push esi // 57 | push edi // 894df0 | mov dword ptr [ebp - 0x10], ecx // ff15???????? | $sequence_39 = { 57 894df0 ff15???????? 8945fc 8b45f0 8945f4 } // n = 6, score = 200 // 57 | push edi // 894df0 | mov dword ptr [ebp - 0x10], ecx // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8945f4 | mov dword ptr [ebp - 0xc], eax $sequence_40 = { 8b85e4feffff 8945f0 8b4df0 e8???????? } // n = 4, score = 200 // 8b85e4feffff | mov eax, dword ptr [ebp - 0x11c] // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // e8???????? | $sequence_41 = { 8bce ff15???????? eb58 3bfb } // n = 4, score = 100 // 8bce | push 4 // ff15???????? | // eb58 | jl 0xffffffe2 // 3bfb | pop esi $sequence_42 = { 8bcb 57 897de4 ff15???????? } // n = 4, score = 100 // 8bcb | push esi // 57 | mov esi, dword ptr [ebp + 0xc] // 897de4 | push eax // ff15???????? | $sequence_43 = { 8d4c2410 51 52 ffd7 8b442410 8b4e2c } // n = 6, score = 100 // 8d4c2410 | push ebp // 51 | mov ebp, esp // 52 | push ecx // ffd7 | sub dword ptr [ebp + 8], 4 // 8b442410 | sub dword ptr [ebp + 8], 4 // 8b4e2c | push ebx $sequence_44 = { 5d 5b 83c460 c20800 8d4c2474 c744247454522500 } // n = 6, score = 100 // 5d | sub dword ptr [ebp + 8], 4 // 5b | push ebx // 83c460 | push esi // c20800 | mov esi, dword ptr [ebp + 0xc] // 8d4c2474 | push esi // c744247454522500 | push 8 $sequence_45 = { 8d4c2428 50 51 e8???????? 8b15???????? c684244010000002 8b0a } // n = 7, score = 100 // 8d4c2428 | test eax, eax // 50 | add esi, 4 // 51 | jl 0xffffffe2 // e8???????? | // 8b15???????? | // c684244010000002 | jl 0xffffffe2 // 8b0a | pop esi $sequence_46 = { 0f849e020000 8b15???????? 8b442448 8bca 8b4004 85c0 } // n = 6, score = 100 // 0f849e020000 | push eax // 8b15???????? | // 8b442448 | add esi, 4 // 8bca | jl 0xffffffe2 // 8b4004 | pop esi // 85c0 | add esi, 4 $sequence_47 = { 0f8484010000 8b442410 32db 3bc5 0f864e010000 b900010000 33c0 } // n = 7, score = 100 // 0f8484010000 | push ebx // 8b442410 | mov ebp, esp // 32db | push ecx // 3bc5 | sub dword ptr [ebp + 8], 4 // 0f864e010000 | push ebx // b900010000 | push esi // 33c0 | push ecx $sequence_48 = { 8d442428 6a00 50 ffd7 85c0 89462c 7526 } // n = 7, score = 100 // 8d442428 | push 0xd // 6a00 | push ecx // 50 | push 0x202 // ffd7 | push eax // 85c0 | je 0x13 // 89462c | push 4 // 7526 | je 0x13 condition: 7 of them and filesize < 1586176 }
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