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 = "2026-01-05" 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 = "20260105" malpedia_hash = "19b79e7cab4eaf532122e5b45a77dd8f6bb5cc79" malpedia_version = "20251219" 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 = { 51 836d0804 53 56 8b750c } // n = 5, score = 2600 // 51 | push ecx // 836d0804 | sub dword ptr [ebp + 8], 4 // 53 | push ebx // 56 | push esi // 8b750c | mov esi, dword ptr [ebp + 0xc] $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 = { e8???????? 89450c 56 85c0 } // n = 4, score = 2600 // e8???????? | // 89450c | mov dword ptr [ebp + 0xc], eax // 56 | push esi // 85c0 | test eax, eax $sequence_3 = { 55 8bec 51 836d0804 } // n = 4, score = 2600 // 55 | push ebp // 8bec | mov ebp, esp // 51 | push ecx // 836d0804 | sub dword ptr [ebp + 8], 4 $sequence_4 = { c645ff30 e8???????? 85c0 7505 } // n = 4, score = 2600 // c645ff30 | mov byte ptr [ebp - 1], 0x30 // e8???????? | // 85c0 | test eax, eax // 7505 | jne 7 $sequence_5 = { 50 68???????? 6a0d 68???????? } // n = 4, score = 2500 // 50 | push eax // 68???????? | // 6a0d | push 0xd // 68???????? | $sequence_6 = { 7411 6a04 68???????? 68???????? } // n = 4, score = 2400 // 7411 | je 0x13 // 6a04 | push 4 // 68???????? | // 68???????? | $sequence_7 = { 7ce0 a1???????? 5e 85c0 } // n = 4, score = 2400 // 7ce0 | jl 0xffffffe2 // a1???????? | // 5e | pop esi // 85c0 | test eax, eax $sequence_8 = { 51 6802020000 68???????? 50 } // n = 4, score = 2400 // 51 | push ecx // 6802020000 | push 0x202 // 68???????? | // 50 | push eax $sequence_9 = { 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_10 = { ffd6 8b0d???????? 894104 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 894104 | mov dword ptr [ecx + 4], eax // 85c0 | test eax, eax $sequence_11 = { 751d 6afe 8d45f0 50 } // n = 4, score = 2200 // 751d | jne 0x1f // 6afe | push -2 // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax $sequence_12 = { 83c40c b801000000 8b4df0 64890d00000000 59 5f } // n = 6, 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 $sequence_13 = { 83c604 81fe???????? 7ce0 a1???????? } // n = 4, score = 2200 // 83c604 | add esi, 4 // 81fe???????? | // 7ce0 | jl 0xffffffe2 // a1???????? | $sequence_14 = { ffd6 8b0d???????? 898138010000 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 898138010000 | mov dword ptr [ecx + 0x138], eax // 85c0 | test eax, eax $sequence_15 = { 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_16 = { c744242004000000 4533c9 4533c0 ba000000c0 488b0d???????? 488b05???????? } // n = 6, score = 500 // c744242004000000 | inc ebp // 4533c9 | xor eax, eax // 4533c0 | dec eax // ba000000c0 | mov ecx, 0x80000001 // 488b0d???????? | // 488b05???????? | $sequence_17 = { 68???????? e8???????? 8b35???????? 83c404 6a00 } // n = 5, score = 500 // 68???????? | // e8???????? | // 8b35???????? | // 83c404 | pop esi // 6a00 | test eax, eax $sequence_18 = { 488b05???????? ff90e8000000 ba10270000 488b0d???????? 488b05???????? } // n = 5, score = 500 // 488b05???????? | // ff90e8000000 | call dword ptr [eax + 0xe8] // ba10270000 | mov edx, 0x2710 // 488b0d???????? | // 488b05???????? | $sequence_19 = { 68???????? 6a00 6a00 ffd6 8b4dfc 5f } // n = 6, score = 500 // 68???????? | // 6a00 | push 0 // 6a00 | push 0 // ffd6 | call esi // 8b4dfc | push -1 // 5f | push 0 $sequence_20 = { 4883c010 4883c428 c3 48890d???????? c3 48895c2410 } // n = 6, score = 500 // 4883c010 | dec eax // 4883c428 | add eax, 0x10 // c3 | dec eax // 48890d???????? | // c3 | add esp, 0x28 // 48895c2410 | ret $sequence_21 = { 33d2 33c9 488b05???????? ff90f0000000 488905???????? } // n = 5, score = 500 // 33d2 | dec eax // 33c9 | add esp, 0x28 // 488b05???????? | // ff90f0000000 | ret // 488905???????? | $sequence_22 = { 6800010000 6a00 68???????? e8???????? 6800020000 6a00 68???????? } // n = 7, score = 500 // 6800010000 | push eax // 6a00 | push -1 // 68???????? | // e8???????? | // 6800020000 | push 0 // 6a00 | push 0 // 68???????? | $sequence_23 = { 488b05???????? ff90e0000000 488b0d???????? 488b05???????? ff90a8010000 } // n = 5, score = 500 // 488b05???????? | // ff90e0000000 | call dword ptr [eax + 0xe0] // 488b0d???????? | // 488b05???????? | // ff90a8010000 | call dword ptr [eax + 0x1a8] $sequence_24 = { 6a00 ffd6 50 68???????? 6aff 68???????? } // n = 6, score = 500 // 6a00 | sub dword ptr [ebp + 8], 4 // ffd6 | push ebx // 50 | push esi // 68???????? | // 6aff | mov esi, dword ptr [ebp + 0xc] // 68???????? | $sequence_25 = { 41b906000200 4533c0 488b15???????? 48c7c101000080 488b05???????? ff9038010000 } // n = 6, score = 500 // 41b906000200 | ret // 4533c0 | dec eax // 488b15???????? | // 48c7c101000080 | mov dword ptr [esp + 0x10], ebx // 488b05???????? | // ff9038010000 | xor edx, edx $sequence_26 = { 8b442458 89442428 488b442450 4889442420 41b903000000 4533c0 488b15???????? } // n = 7, score = 500 // 8b442458 | inc ebp // 89442428 | xor ecx, ecx // 488b442450 | inc ebp // 4889442420 | xor eax, eax // 41b903000000 | mov edx, 0xc0000000 // 4533c0 | mov dword ptr [esp + 0x20], 4 // 488b15???????? | $sequence_27 = { 7cd5 68???????? e8???????? 8b4dfc } // n = 4, score = 400 // 7cd5 | push 0x100 // 68???????? | // e8???????? | // 8b4dfc | push 0 $sequence_28 = { 8b4dfc 5f 5e 33cd b8???????? 5b } // n = 6, score = 400 // 8b4dfc | pop edi // 5f | add esp, 4 // 5e | push 0 // 33cd | push -1 // b8???????? | // 5b | push 0 $sequence_29 = { 6a0a 8d45f4 50 51 e8???????? } // n = 5, score = 300 // 6a0a | push -1 // 8d45f4 | push 0 // 50 | push 0 // 51 | push 0 // e8???????? | $sequence_30 = { 6800000080 8d85f0fdffff 50 ff15???????? 8bf0 83feff } // n = 6, score = 300 // 6800000080 | push 0 // 8d85f0fdffff | call esi // 50 | mov ecx, dword ptr [ebp - 4] // ff15???????? | // 8bf0 | pop edi // 83feff | push 0x100 $sequence_31 = { 894df0 ff15???????? 8945fc 8b45f0 8945f4 8b45f4 50 } // n = 7, score = 200 // 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 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 50 | push eax $sequence_32 = { 57 c785ecfeffff01000000 c785e8feffffe197af54 0f6e85e8feffff } // n = 4, score = 200 // 57 | push edi // c785ecfeffff01000000 | mov dword ptr [ebp - 0x114], 1 // c785e8feffffe197af54 | mov dword ptr [ebp - 0x118], 0x54af97e1 // 0f6e85e8feffff | movd mm0, dword ptr [ebp - 0x118] $sequence_33 = { 53 56 57 894df0 ff15???????? 8945fc } // n = 6, score = 200 // 53 | push ebx // 56 | push esi // 57 | push edi // 894df0 | mov dword ptr [ebp - 0x10], ecx // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax $sequence_34 = { 8bf1 8b06 50 8b08 ff9180000000 } // n = 5, score = 200 // 8bf1 | mov esi, ecx // 8b06 | mov eax, dword ptr [esi] // 50 | push eax // 8b08 | mov ecx, dword ptr [eax] // ff9180000000 | call dword ptr [ecx + 0x80] $sequence_35 = { 50 ff512c 8bce 8bd8 } // n = 4, score = 200 // 50 | push eax // ff512c | call dword ptr [ecx + 0x2c] // 8bce | mov ecx, esi // 8bd8 | mov ebx, eax $sequence_36 = { 6aff 50 6a00 6a00 ff15???????? 5e } // n = 6, score = 200 // 6aff | push -1 // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // 5e | pop esi $sequence_37 = { 53 56 57 c745dce197af54 0f6e45dc 0f72f002 } // n = 6, score = 200 // 53 | push ebx // 56 | push esi // 57 | push edi // c745dce197af54 | mov dword ptr [ebp - 0x24], 0x54af97e1 // 0f6e45dc | movd mm0, dword ptr [ebp - 0x24] // 0f72f002 | pslld mm0, 2 $sequence_38 = { 6a07 68???????? e8???????? 85c0 7402 eb0d 68e0930400 } // n = 7, score = 200 // 6a07 | push 7 // 68???????? | // e8???????? | // 85c0 | test eax, eax // 7402 | je 4 // eb0d | jmp 0xf // 68e0930400 | push 0x493e0 $sequence_39 = { 52 50 8bce e8???????? 50 ffd7 85c0 } // n = 7, score = 100 // 52 | inc ebp // 50 | xor eax, eax // 8bce | dec eax // e8???????? | // 50 | mov ecx, 0x80000001 // ffd7 | dec eax // 85c0 | mov dword ptr [esp + 0x20], eax $sequence_40 = { 895e30 895e2c 895e34 8bc6 5f 5e } // n = 6, score = 100 // 895e30 | dec eax // 895e2c | mov ecx, 0x80000001 // 895e34 | call dword ptr [eax + 0x138] // 8bc6 | mov eax, dword ptr [esp + 0x58] // 5f | mov dword ptr [esp + 0x28], eax // 5e | dec eax $sequence_41 = { c645fc04 50 e8???????? 83c418 6a01 } // n = 5, score = 100 // c645fc04 | inc ecx // 50 | mov ecx, 0x20006 // e8???????? | // 83c418 | inc ebp // 6a01 | xor eax, eax $sequence_42 = { e8???????? 8b4e2c 8b5610 89442424 6aff 8d442428 6a00 } // n = 7, score = 100 // e8???????? | // 8b4e2c | call dword ptr [eax + 0xe8] // 8b5610 | mov edx, 0x2710 // 89442424 | call dword ptr [eax + 0x10] // 6aff | call dword ptr [eax + 0xe8] // 8d442428 | mov edx, 0x2710 // 6a00 | call dword ptr [eax + 0x10] $sequence_43 = { fe40ff eb3d 8b742448 6a01 53 } // n = 5, score = 100 // fe40ff | mov ecx, 0x20006 // eb3d | inc ebp // 8b742448 | xor eax, eax // 6a01 | dec eax // 53 | mov ecx, 0x80000001 $sequence_44 = { 8b4c2474 8b7c2478 8944241c 56 89442424 6a01 } // n = 6, score = 100 // 8b4c2474 | ret // 8b7c2478 | ret // 8944241c | dec eax // 56 | mov dword ptr [esp + 0x10], ebx // 89442424 | dec eax // 6a01 | mov dword ptr [esp + 0x18], esi $sequence_45 = { 8bf0 8b442414 85c0 7505 a1???????? } // n = 5, score = 100 // 8bf0 | call dword ptr [eax + 0xe8] // 8b442414 | mov edx, 0x2710 // 85c0 | dec eax // 7505 | add esp, 0x28 // a1???????? | $sequence_46 = { ff15???????? 85c0 894604 7522 8d4de4 } // n = 5, score = 100 // ff15???????? | // 85c0 | mov edx, 0x80000000 // 894604 | dec eax // 7522 | mov dword ptr [esp + 0x20], eax // 8d4de4 | inc ecx condition: 7 of them and filesize < 1586176 }
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