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 = "2023-12-06" 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 = "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 = { e8???????? 89450c 56 85c0 } // n = 4, score = 2600 // e8???????? | // 89450c | mov dword ptr [ebp + 0xc], eax // 56 | push esi // 85c0 | test eax, eax $sequence_1 = { c645ff30 e8???????? 85c0 7505 } // n = 4, score = 2600 // c645ff30 | mov byte ptr [ebp - 1], 0x30 // e8???????? | // 85c0 | test eax, eax // 7505 | jne 7 $sequence_2 = { 8bec 51 836d0804 53 } // n = 4, score = 2600 // 8bec | mov ebp, esp // 51 | push ecx // 836d0804 | sub dword ptr [ebp + 8], 4 // 53 | push ebx $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 = { 8b750c 56 e8???????? 6a08 } // n = 4, score = 2600 // 8b750c | mov esi, dword ptr [ebp + 0xc] // 56 | push esi // e8???????? | // 6a08 | push 8 $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 = { 7411 6a04 68???????? 68???????? } // n = 4, score = 2400 // 7411 | je 0x13 // 6a04 | push 4 // 68???????? | // 68???????? | $sequence_8 = { 7ce0 a1???????? 5e 85c0 } // n = 4, score = 2400 // 7ce0 | jl 0xffffffe2 // a1???????? | // 5e | pop esi // 85c0 | test eax, eax $sequence_9 = { ff15???????? 83c604 81fe???????? 7ce0 } // n = 4, score = 2200 // ff15???????? | // 83c604 | add esi, 4 // 81fe???????? | // 7ce0 | jl 0xffffffe2 $sequence_10 = { ffd6 8b0d???????? 898114010000 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 898114010000 | mov dword ptr [ecx + 0x114], eax // 85c0 | test eax, eax $sequence_11 = { ffd6 8b0d???????? 898198000000 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 898198000000 | mov dword ptr [ecx + 0x98], eax // 85c0 | test eax, eax $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???????? 894160 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 894160 | mov dword ptr [ecx + 0x60], eax // 85c0 | test eax, eax $sequence_14 = { ffd6 ffd0 a3???????? 5e 85c0 750a a1???????? } // n = 7, score = 2200 // ffd6 | call esi // ffd0 | call eax // a3???????? | // 5e | pop esi // 85c0 | test eax, eax // 750a | jne 0xc // a1???????? | $sequence_15 = { 6a01 68???????? ff35???????? ff15???????? ffd0 } // n = 5, score = 1100 // 6a01 | push 1 // 68???????? | // ff35???????? | // ff15???????? | // ffd0 | call eax $sequence_16 = { 488b05???????? ff90e8000000 90 4883c420 } // n = 4, score = 500 // 488b05???????? | // ff90e8000000 | mov ecx, 0x80000001 // 90 | call dword ptr [eax + 0x138] // 4883c420 | dec eax $sequence_17 = { 68???????? e8???????? 8b35???????? 83c404 6a00 68???????? 6aff } // n = 7, score = 500 // 68???????? | // e8???????? | // 8b35???????? | // 83c404 | add esi, 4 // 6a00 | jl 0xffffffe2 // 68???????? | // 6aff | pop esi $sequence_18 = { 4889442420 41b906000200 4533c0 488b15???????? 48c7c101000080 488b05???????? ff9038010000 } // n = 7, score = 500 // 4889442420 | xor edx, edx // 41b906000200 | dec eax // 4533c0 | lea ecx, [esp + 0x50] // 488b15???????? | // 48c7c101000080 | call dword ptr [eax + 0x2d8] // 488b05???????? | // ff9038010000 | dec eax $sequence_19 = { 6800010000 6a00 68???????? e8???????? 6800020000 } // n = 5, score = 500 // 6800010000 | pop esi // 6a00 | test eax, eax // 68???????? | // e8???????? | // 6800020000 | add esi, 4 $sequence_20 = { ffd6 50 68???????? 6aff } // n = 4, score = 500 // ffd6 | jl 0xffffffe2 // 50 | pop esi // 68???????? | // 6aff | test eax, eax $sequence_21 = { 488b0d???????? 488b05???????? ff5010 85c0 } // n = 4, score = 500 // 488b0d???????? | // 488b05???????? | // ff5010 | mov edx, 0xc0000000 // 85c0 | call dword ptr [eax + 0x40] $sequence_22 = { 50 68???????? 6aff 68???????? 6a00 6a00 ffd6 } // n = 7, score = 500 // 50 | test eax, eax // 68???????? | // 6aff | jne 9 // 68???????? | // 6a00 | mov ebp, esp // 6a00 | push ecx // ffd6 | sub dword ptr [ebp + 8], 4 $sequence_23 = { 4883c428 c3 48890d???????? c3 48895c2410 4889742418 55 } // n = 7, score = 500 // 4883c428 | dec eax // c3 | add esp, 0x28 // 48890d???????? | // c3 | ret // 48895c2410 | ret // 4889742418 | dec eax // 55 | mov dword ptr [esp + 0x10], ebx $sequence_24 = { 33d2 488d4c2450 488b05???????? ff90d8020000 } // n = 4, score = 500 // 33d2 | dec eax // 488d4c2450 | mov dword ptr [esp + 0x18], esi // 488b05???????? | // ff90d8020000 | push ebp $sequence_25 = { 4533c9 4533c0 ba000000c0 488b0d???????? 488b05???????? ff5040 } // n = 6, score = 500 // 4533c9 | add eax, 0x10 // 4533c0 | dec eax // ba000000c0 | add esp, 0x28 // 488b0d???????? | // 488b05???????? | // ff5040 | ret $sequence_26 = { 448bc0 ba08000000 488b0d???????? ff15???????? 488905???????? } // n = 5, score = 500 // 448bc0 | dec eax // ba08000000 | add esp, 0x28 // 488b0d???????? | // ff15???????? | // 488905???????? | $sequence_27 = { 488b0d???????? 488b05???????? ff5028 48c705????????00000000 } // n = 4, score = 500 // 488b0d???????? | // 488b05???????? | // ff5028 | inc ebp // 48c705????????00000000 | $sequence_28 = { ffd6 8b4dfc 5f 5e 33cd b8???????? } // n = 6, score = 400 // ffd6 | call esi // 8b4dfc | push eax // 5f | push -1 // 5e | add esp, 4 // 33cd | push 0 // b8???????? | $sequence_29 = { 7cd5 68???????? e8???????? 8b4dfc 83c404 } // n = 5, score = 400 // 7cd5 | push 0 // 68???????? | // e8???????? | // 8b4dfc | push -1 // 83c404 | push 0 $sequence_30 = { 53 68???????? ff35???????? ffd6 ffd0 85c0 } // n = 6, score = 400 // 53 | push ebx // 68???????? | // ff35???????? | // ffd6 | call esi // ffd0 | call eax // 85c0 | test eax, eax $sequence_31 = { e8???????? 8b8c2424020000 5b 33cc 33c0 e8???????? } // n = 6, score = 300 // e8???????? | // 8b8c2424020000 | push 0 // 5b | call esi // 33cc | mov ecx, dword ptr [ebp - 4] // 33c0 | pop edi // e8???????? | $sequence_32 = { 52 50 ff91f0000000 8bf0 } // n = 4, score = 300 // 52 | push edx // 50 | push eax // ff91f0000000 | call dword ptr [ecx + 0xf0] // 8bf0 | mov esi, eax $sequence_33 = { a1???????? 33c5 8945fc 6a0a 8d45f4 50 51 } // n = 7, score = 300 // a1???????? | // 33c5 | push 0 // 8945fc | call esi // 6a0a | add esp, 4 // 8d45f4 | push 0 // 50 | push -1 // 51 | push 0 $sequence_34 = { 8d55f8 52 50 8b08 ff5124 } // n = 5, score = 300 // 8d55f8 | lea edx, [ebp - 8] // 52 | push edx // 50 | push eax // 8b08 | mov ecx, dword ptr [eax] // ff5124 | call dword ptr [ecx + 0x24] $sequence_35 = { c20c00 6a02 ff74240c ff74240c e8???????? c20800 ff74240c } // n = 7, score = 300 // c20c00 | ret 0xc // 6a02 | push 2 // ff74240c | push dword ptr [esp + 0xc] // ff74240c | push dword ptr [esp + 0xc] // e8???????? | // c20800 | ret 8 // ff74240c | push dword ptr [esp + 0xc] $sequence_36 = { 57 50 ff512c 8bce } // n = 4, score = 200 // 57 | push edi // 50 | push eax // ff512c | call dword ptr [ecx + 0x2c] // 8bce | mov ecx, esi $sequence_37 = { 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_38 = { 8945fc 8b45f0 8945f4 8b45f4 } // n = 4, score = 200 // 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] $sequence_39 = { 50 8b08 ff9180000000 8b06 } // n = 4, score = 200 // 50 | push eax // 8b08 | mov ecx, dword ptr [eax] // ff9180000000 | call dword ptr [ecx + 0x80] // 8b06 | mov eax, dword ptr [esi] $sequence_40 = { ff512c 8bce 8bd8 e8???????? 57 } // n = 5, score = 200 // ff512c | call dword ptr [ecx + 0x2c] // 8bce | mov ecx, esi // 8bd8 | mov ebx, eax // e8???????? | // 57 | push edi $sequence_41 = { 57 c785ecfeffff01000000 c785e8feffffe197af54 0f6e85e8feffff 0f72f002 } // n = 5, 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] // 0f72f002 | pslld mm0, 2 $sequence_42 = { 83ec24 53 56 57 c745dce197af54 } // n = 5, score = 200 // 83ec24 | sub esp, 0x24 // 53 | push ebx // 56 | push esi // 57 | push edi // c745dce197af54 | mov dword ptr [ebp - 0x24], 0x54af97e1 $sequence_43 = { 8d443001 6a00 51 50 } // n = 4, score = 200 // 8d443001 | lea eax, [eax + esi + 1] // 6a00 | push 0 // 51 | push ecx // 50 | push eax $sequence_44 = { 8d7901 8d4c2420 57 ff15???????? 84c0 } // n = 5, score = 100 // 8d7901 | mov eax, dword ptr [esi] // 8d4c2420 | test eax, eax // 57 | je 0x13 // ff15???????? | // 84c0 | push eax $sequence_45 = { 6800040000 51 56 8974242c ff15???????? 85c0 0f8484010000 } // n = 7, score = 100 // 6800040000 | add esi, 4 // 51 | jl 0xffffffe2 // 56 | call esi // 8974242c | mov dword ptr [ecx + 0xe4], eax // ff15???????? | // 85c0 | test eax, eax // 0f8484010000 | call dword ptr [eax + 0xe8] $sequence_46 = { 51 52 ff15???????? 8b442410 8b4e10 } // n = 5, score = 100 // 51 | mov edx, 0x2710 // 52 | call dword ptr [eax + 0x10] // ff15???????? | // 8b442410 | jmp 6 // 8b4e10 | dec eax $sequence_47 = { a1???????? 8b00 8b4c2420 88440c18 } // n = 4, score = 100 // a1???????? | // 8b00 | jl 0xffffffe2 // 8b4c2420 | pop esi // 88440c18 | test eax, eax $sequence_48 = { 85db 7548 fec8 53 b9???????? 8842ff } // n = 6, score = 100 // 85db | ret // 7548 | dec eax // fec8 | mov dword ptr [esp + 0x10], ebx // 53 | dec eax // b9???????? | // 8842ff | add eax, 0x10 $sequence_49 = { e8???????? 8a54240b 83c404 8b4c2430 895c2410 3bcb } // n = 6, score = 100 // e8???????? | // 8a54240b | call dword ptr [eax + 0xe8] // 83c404 | nop // 8b4c2430 | dec eax // 895c2410 | add esp, 0x20 // 3bcb | xor edx, edx $sequence_50 = { 52 56 50 ff15???????? 6a01 } // n = 5, score = 100 // 52 | add eax, 0x10 // 56 | dec eax // 50 | add esp, 0x28 // ff15???????? | // 6a01 | ret $sequence_51 = { 8d442428 c684244010000001 8b11 8d4c2418 52 56 } // n = 6, score = 100 // 8d442428 | dec eax // c684244010000001 | add esp, 0x28 // 8b11 | ret // 8d4c2418 | ret // 52 | dec eax // 56 | mov dword ptr [esp + 0x10], ebx condition: 7 of them and filesize < 1586176 }
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