Actor(s): Sofacy
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rule win_sedreco_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 | push esi // 56 | push ebp // 85c0 | mov ebp, esp $sequence_1 = { 55 8bec 51 836d0804 53 } // n = 5, score = 2600 // 55 | add esp, 0x28 // 8bec | ret // 51 | dec eax // 836d0804 | mov dword ptr [esp + 8], ebx // 53 | push edi $sequence_2 = { c645ff30 e8???????? 85c0 7505 } // n = 4, score = 2600 // c645ff30 | push ecx // e8???????? | // 85c0 | sub dword ptr [ebp + 8], 4 // 7505 | push ebx $sequence_3 = { 836d0804 53 56 8b750c } // n = 4, score = 2600 // 836d0804 | mov ecx, 3 // 53 | inc ebp // 56 | xor eax, eax // 8b750c | mov edx, 8 $sequence_4 = { 8b750c 56 e8???????? 6a08 } // n = 4, score = 2600 // 8b750c | mov esi, dword ptr [ebp + 0xc] // 56 | push ebp // e8???????? | // 6a08 | mov ebp, esp $sequence_5 = { 50 68???????? 6a0d 68???????? } // n = 4, score = 2500 // 50 | jne 7 // 68???????? | // 6a0d | mov ebp, esp // 68???????? | $sequence_6 = { 51 6802020000 68???????? 50 } // n = 4, score = 2400 // 51 | push ecx // 6802020000 | sub dword ptr [ebp + 8], 4 // 68???????? | // 50 | push ebx $sequence_7 = { 7411 6a04 68???????? 68???????? e8???????? } // n = 5, score = 2400 // 7411 | push esi // 6a04 | mov esi, dword ptr [ebp + 0xc] // 68???????? | // 68???????? | // e8???????? | $sequence_8 = { 7ce0 a1???????? 5e 85c0 } // n = 4, score = 2400 // 7ce0 | push esi // a1???????? | // 5e | mov esi, dword ptr [ebp + 0xc] // 85c0 | push eax $sequence_9 = { ffd6 8b0d???????? 894168 85c0 } // n = 4, score = 2200 // ffd6 | add esi, 4 // 8b0d???????? | // 894168 | jl 0xffffffe2 // 85c0 | add esi, 4 $sequence_10 = { ffd0 c745fcfeffffff e8???????? 33c0 8b4df0 64890d00000000 } // n = 6, score = 2200 // ffd0 | jl 0xffffffe2 // c745fcfeffffff | pop esi // e8???????? | // 33c0 | push esi // 8b4df0 | mov eax, dword ptr [esi] // 64890d00000000 | test eax, eax $sequence_11 = { ff15???????? 83c604 81fe???????? 7ce0 a1???????? } // n = 5, score = 2200 // ff15???????? | // 83c604 | pop esi // 81fe???????? | // 7ce0 | jl 0xffffffe2 // a1???????? | $sequence_12 = { e8???????? 83c40c b8f2eeeeee 8b4df0 64890d00000000 } // n = 5, score = 2200 // e8???????? | // 83c40c | add esi, 4 // b8f2eeeeee | jl 0xffffffe2 // 8b4df0 | add esi, 4 // 64890d00000000 | jl 0xffffffe2 $sequence_13 = { be???????? 8b06 85c0 740f 50 } // n = 5, score = 2200 // be???????? | // 8b06 | je 0x13 // 85c0 | push 4 // 740f | jl 0xffffffe2 // 50 | pop esi $sequence_14 = { b8f6eeeeee 8b4df0 64890d00000000 59 } // n = 4, score = 2200 // b8f6eeeeee | test eax, eax // 8b4df0 | call eax // 64890d00000000 | mov dword ptr [ebp - 4], 0xfffffffe // 59 | xor eax, eax $sequence_15 = { 6a01 68???????? ff35???????? ff15???????? ffd0 } // n = 5, score = 1100 // 6a01 | add esi, 4 // 68???????? | // ff35???????? | // ff15???????? | // ffd0 | jl 0xffffffe2 $sequence_16 = { 33d2 488b0d???????? ff15???????? 90 } // n = 4, score = 500 // 33d2 | dec eax // 488b0d???????? | // ff15???????? | // 90 | mov dword ptr [esp + 0x20], eax $sequence_17 = { 68???????? e8???????? 8b35???????? 83c404 6a00 68???????? } // n = 6, score = 500 // 68???????? | // e8???????? | // 8b35???????? | // 83c404 | sub dword ptr [ebp + 8], 4 // 6a00 | push ebx // 68???????? | $sequence_18 = { 4533c9 4533c0 ba000000c0 488b0d???????? 488b05???????? ff5040 } // n = 6, score = 500 // 4533c9 | inc ecx // 4533c0 | mov ecx, 3 // ba000000c0 | inc ebp // 488b0d???????? | // 488b05???????? | // ff5040 | xor eax, eax $sequence_19 = { ba10270000 488b0d???????? 488b05???????? ff5010 85c0 } // n = 5, score = 500 // ba10270000 | inc ecx // 488b0d???????? | // 488b05???????? | // ff5010 | mov ecx, 3 // 85c0 | inc ebp $sequence_20 = { 488b442450 4889442420 41b903000000 4533c0 } // n = 4, score = 500 // 488b442450 | dec eax // 4889442420 | mov eax, dword ptr [esp + 0x50] // 41b903000000 | dec eax // 4533c0 | mov dword ptr [esp + 0x20], eax $sequence_21 = { 68???????? 6a00 6a00 ffd6 8b4dfc } // n = 5, score = 500 // 68???????? | // 6a00 | push 0x10 // 6a00 | push 1 // ffd6 | push 0 // 8b4dfc | push -1 $sequence_22 = { 33c9 488b05???????? ff90f0000000 488905???????? } // n = 4, score = 500 // 33c9 | test eax, eax // 488b05???????? | // ff90f0000000 | call dword ptr [eax + 0xe8] // 488905???????? | $sequence_23 = { ff90a8010000 85c0 7405 e8???????? } // n = 4, score = 500 // ff90a8010000 | mov edx, 0x2710 // 85c0 | call dword ptr [eax + 0x10] // 7405 | xor ecx, ecx // e8???????? | $sequence_24 = { c705????????01000000 33c0 4883c428 c3 48895c2408 57 } // n = 6, score = 500 // c705????????01000000 | // 33c0 | mov edx, 0x2710 // 4883c428 | call dword ptr [eax + 0x10] // c3 | xor edx, edx // 48895c2408 | nop // 57 | inc ebp $sequence_25 = { 6800010000 6a00 68???????? e8???????? 6800020000 6a00 } // n = 6, score = 500 // 6800010000 | push 0 // 6a00 | push 0 // 68???????? | // e8???????? | // 6800020000 | call esi // 6a00 | push 0 $sequence_26 = { 6a10 6a01 68???????? 68???????? } // n = 4, score = 500 // 6a10 | push 0 // 6a01 | push 0 // 68???????? | // 68???????? | $sequence_27 = { 6a00 ffd6 50 68???????? 6aff 68???????? } // n = 6, score = 500 // 6a00 | test eax, eax // ffd6 | jne 9 // 50 | mov ebp, esp // 68???????? | // 6aff | push ecx // 68???????? | $sequence_28 = { 488b15???????? 488d4c2438 e8???????? 89442430 } // n = 4, score = 500 // 488b15???????? | // 488d4c2438 | call dword ptr [eax + 0xf0] // e8???????? | // 89442430 | call dword ptr [eax + 0x1a8] $sequence_29 = { ffd6 8b4dfc 5f 5e 33cd b8???????? } // n = 6, score = 400 // ffd6 | pop edi // 8b4dfc | add esp, 4 // 5f | push 0 // 5e | push -1 // 33cd | push 0 // b8???????? | $sequence_30 = { 7cd5 68???????? e8???????? 8b4dfc } // n = 4, score = 400 // 7cd5 | pop esi // 68???????? | // e8???????? | // 8b4dfc | xor ecx, ebp $sequence_31 = { b92e000000 e8???????? 50 ffd7 } // n = 4, score = 300 // b92e000000 | push 0 // e8???????? | // 50 | push 0 // ffd7 | call esi $sequence_32 = { ff15???????? 33c9 6685c0 0f95c1 8bc1 } // n = 5, score = 300 // ff15???????? | // 33c9 | pop edi // 6685c0 | pop esi // 0f95c1 | xor ecx, ebp // 8bc1 | pop ebx $sequence_33 = { 6a06 6a02 6a00 6a00 6800000040 68???????? } // n = 6, score = 200 // 6a06 | pop ebx // 6a02 | push 0x100 // 6a00 | push 0 // 6a00 | pop ebx // 6800000040 | push 0x100 // 68???????? | $sequence_34 = { 741f 6a07 68???????? e8???????? } // n = 4, score = 200 // 741f | sub esi, 4 // 6a07 | jae 0xfffffff1 // 68???????? | // e8???????? | $sequence_35 = { ff15???????? 8945fc 8b45f0 8945f4 } // n = 4, score = 200 // ff15???????? | // 8945fc | push 2 // 8b45f0 | push 0 // 8945f4 | push 0 $sequence_36 = { 8b85e4feffff 8945f0 8b4df0 e8???????? 85c0 } // n = 5, score = 200 // 8b85e4feffff | push 0x40000000 // 8945f0 | push edi // 8b4df0 | push eax // e8???????? | // 85c0 | call dword ptr [ecx + 0x2c] $sequence_37 = { 53 56 57 c745dce197af54 } // n = 4, score = 200 // 53 | cmp esi, -4 // 56 | je 0x3d // 57 | mov cl, byte ptr [edx] // c745dce197af54 | push 6 $sequence_38 = { 68???????? e8???????? 85c0 7402 eb0d 68e0930400 } // n = 6, score = 200 // 68???????? | // e8???????? | // 85c0 | push ebx // 7402 | push esi // eb0d | push edi // 68e0930400 | mov dword ptr [ebp - 0x24], 0x54af97e1 $sequence_39 = { 57 50 ff512c 8bce 8bd8 e8???????? 57 } // n = 7, score = 200 // 57 | push 0 // 50 | xor ecx, ecx // ff512c | test ax, ax // 8bce | setne cl // 8bd8 | mov eax, ecx // e8???????? | // 57 | add eax, 4 $sequence_40 = { ff512c 8bf0 f7de 1bf6 } // n = 4, score = 200 // ff512c | push edi // 8bf0 | push eax // f7de | call dword ptr [ecx + 0x2c] // 1bf6 | mov ecx, esi $sequence_41 = { ff15???????? 8b4304 3bc6 7505 } // n = 4, score = 100 // ff15???????? | // 8b4304 | cmp ecx, ebx // 3bc6 | mov dword ptr [esp + 0x1c], ebx // 7505 | mov dword ptr [esp + 0x20], ebx $sequence_42 = { 8bca 83e103 f3aa 8a5c2411 8a442410 8ad3 8ac8 } // n = 7, score = 100 // 8bca | pop esi // 83e103 | test eax, eax // f3aa | lea ecx, [esp + 0x2c] // 8a5c2411 | mov byte ptr [esp + eax + 0x3c], 0 // 8a442410 | mov byte ptr [esp + 0x2c], dl // 8ad3 | lea edi, [esp + 0x38] // 8ac8 | or ecx, 0xffffffff $sequence_43 = { 8d4c242c c644043c00 8854242c ff15???????? 8d7c2438 83c9ff } // n = 6, score = 100 // 8d4c242c | mov ebp, esp // c644043c00 | push ecx // 8854242c | sub dword ptr [ebp + 8], 4 // ff15???????? | // 8d7c2438 | push ebx // 83c9ff | push eax $sequence_44 = { 89442438 c744243c44000000 89742440 89742448 89742444 89742458 } // n = 6, score = 100 // 89442438 | inc eax // c744243c44000000 | mov dword ptr [esp + 0x18], eax // 89742440 | mov eax, dword ptr [esp + 0x40] // 89742448 | inc esi // 89742444 | mov ecx, dword ptr [esp + 0x2048] // 89742458 | mov dword ptr [esp + 0x18], ebx $sequence_45 = { 40 89442418 8b442440 46 } // n = 4, score = 100 // 40 | push 0xd // 89442418 | push ecx // 8b442440 | push 0x202 // 46 | push eax $sequence_46 = { 85c9 8944241c 0f85aefeffff 85ff 897c241c } // n = 5, score = 100 // 85c9 | mov ecx, edx // 8944241c | and ecx, 3 // 0f85aefeffff | rep stosb byte ptr es:[edi], al // 85ff | mov bl, byte ptr [esp + 0x11] // 897c241c | mov al, byte ptr [esp + 0x10] $sequence_47 = { 03c2 8ae9 8808 8b442428 8974242c c6043000 47 } // n = 7, score = 100 // 03c2 | mov dl, bl // 8ae9 | mov cl, al // 8808 | mov dword ptr [esp + 0x38], eax // 8b442428 | mov dword ptr [esp + 0x3c], 0x44 // 8974242c | mov dword ptr [esp + 0x40], esi // c6043000 | mov dword ptr [esp + 0x48], esi // 47 | mov dword ptr [esp + 0x44], esi $sequence_48 = { 8b8c2448200000 895c2418 3bcb 895c241c 895c2420 } // n = 5, score = 100 // 8b8c2448200000 | je 0x13 // 895c2418 | push 4 // 3bcb | je 0x13 // 895c241c | push 4 // 895c2420 | jl 0xffffffe2 condition: 7 of them and filesize < 1586176 }
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