Actor(s): Sofacy
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rule win_sedreco_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-06-10" 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 = "20210604" malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd" malpedia_version = "20210616" 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 = { 8b750c 56 e8???????? 6a08 } // n = 4, score = 2600 // 8b750c | mov esi, dword ptr [ebp + 0xc] // 56 | push esi // e8???????? | // 6a08 | push 8 $sequence_1 = { 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_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 = { e8???????? 89450c 56 85c0 } // n = 4, score = 2600 // e8???????? | // 89450c | mov dword ptr [ebp + 0xc], eax // 56 | push esi // 85c0 | test eax, eax $sequence_4 = { 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_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 | sub dword ptr [ebp + 8], 4 // 68???????? | // 50 | push ebx $sequence_7 = { 7411 6a04 68???????? 68???????? e8???????? } // n = 5, score = 2400 // 7411 | je 0x13 // 6a04 | push 4 // 68???????? | // 68???????? | // e8???????? | $sequence_8 = { 7ce0 a1???????? 5e 85c0 } // n = 4, score = 2400 // 7ce0 | jl 0xffffffe2 // a1???????? | // 5e | pop esi // 85c0 | test eax, eax $sequence_9 = { ffd6 8b0d???????? 894138 85c0 } // n = 4, score = 2200 // ffd6 | mov ebp, esp // 8b0d???????? | // 894138 | push ecx // 85c0 | sub dword ptr [ebp + 8], 4 $sequence_10 = { 57 8b3d???????? 56 683f000f00 6a00 } // n = 5, score = 2200 // 57 | push ecx // 8b3d???????? | // 56 | sub dword ptr [ebp + 8], 4 // 683f000f00 | push ebx // 6a00 | push ebp $sequence_11 = { ffd6 8b0d???????? 898150010000 85c0 } // n = 4, score = 2200 // ffd6 | test eax, eax // 8b0d???????? | // 898150010000 | jne 0xd // 85c0 | push ebp $sequence_12 = { ffd6 8b0d???????? 894118 85c0 } // n = 4, score = 2200 // ffd6 | push ecx // 8b0d???????? | // 894118 | sub dword ptr [ebp + 8], 4 // 85c0 | push ebx $sequence_13 = { ffd6 ffd0 a3???????? 5e 85c0 } // n = 5, score = 2200 // ffd6 | push ecx // ffd0 | sub dword ptr [ebp + 8], 4 // a3???????? | // 5e | mov byte ptr [ebp - 1], 0x30 // 85c0 | test eax, eax $sequence_14 = { ffd6 8b0d???????? 898168010000 85c0 } // n = 4, score = 2200 // ffd6 | jne 9 // 8b0d???????? | // 898168010000 | push ecx // 85c0 | sub dword ptr [ebp + 8], 4 $sequence_15 = { 6a01 68???????? ff35???????? ff15???????? ffd0 } // n = 5, score = 1100 // 6a01 | push ebp // 68???????? | // ff35???????? | // ff15???????? | // ffd0 | mov ebp, esp $sequence_16 = { 33d2 488b0d???????? ff15???????? 90 } // n = 4, score = 500 // 33d2 | dec eax // 488b0d???????? | // ff15???????? | // 90 | add esp, 0x28 $sequence_17 = { 6800010000 6a00 68???????? e8???????? 6800020000 6a00 } // n = 6, score = 500 // 6800010000 | sub dword ptr [ebp + 8], 4 // 6a00 | jl 0xffffffe2 // 68???????? | // e8???????? | // 6800020000 | pop esi // 6a00 | test eax, eax $sequence_18 = { 4533c9 4533c0 ba00000080 488b0d???????? 488b05???????? ff5040 } // n = 6, score = 500 // 4533c9 | xor edx, edx // 4533c0 | dec eax // ba00000080 | mov ecx, eax // 488b0d???????? | // 488b05???????? | // ff5040 | call dword ptr [eax + 0xe0] $sequence_19 = { 488b0d???????? 488b05???????? ff90e8000000 ba10270000 488b0d???????? 488b05???????? } // n = 6, score = 500 // 488b0d???????? | // 488b05???????? | // ff90e8000000 | call dword ptr [eax + 0x1a8] // ba10270000 | inc ebp // 488b0d???????? | // 488b05???????? | $sequence_20 = { 8b35???????? 83c404 6a00 68???????? 6aff 68???????? } // n = 6, score = 500 // 8b35???????? | // 83c404 | push esi // 6a00 | push 8 // 68???????? | // 6aff | push ecx // 68???????? | $sequence_21 = { 488b05???????? ff90e0000000 488b0d???????? 488b05???????? ff90a8010000 } // n = 5, score = 500 // 488b05???????? | // ff90e0000000 | inc ebp // 488b0d???????? | // 488b05???????? | // ff90a8010000 | xor eax, eax $sequence_22 = { 68???????? 6aff 68???????? 6a00 6a00 ffd6 8b4dfc } // n = 7, score = 500 // 68???????? | // 6aff | push ebx // 68???????? | // 6a00 | push esi // 6a00 | mov esi, dword ptr [ebp + 0xc] // ffd6 | mov dword ptr [ebp + 0xc], eax // 8b4dfc | push esi $sequence_23 = { 4533c9 4533c0 33d2 488bc8 488b05???????? } // n = 5, score = 500 // 4533c9 | add esp, 0x28 // 4533c0 | ret // 33d2 | inc ebp // 488bc8 | xor ecx, ecx // 488b05???????? | $sequence_24 = { 488b442450 4889442420 41b903000000 4533c0 } // n = 4, score = 500 // 488b442450 | ret // 4889442420 | dec eax // 41b903000000 | mov dword ptr [esp + 8], ebx // 4533c0 | push edi $sequence_25 = { eb04 4883c010 4883c428 c3 48890d???????? } // n = 5, score = 500 // eb04 | jmp 6 // 4883c010 | dec eax // 4883c428 | add eax, 0x10 // c3 | dec eax // 48890d???????? | $sequence_26 = { 6a00 ffd6 50 68???????? 6aff } // n = 5, score = 500 // 6a00 | push eax // ffd6 | push -1 // 50 | call esi // 68???????? | // 6aff | push eax $sequence_27 = { c705????????01000000 33c0 4883c428 c3 48895c2408 57 4883ec20 } // n = 7, score = 500 // c705????????01000000 | // 33c0 | call dword ptr [eax + 0x40] // 4883c428 | dec eax // c3 | add esp, 0x28 // 48895c2408 | ret // 57 | ret // 4883ec20 | dec eax $sequence_28 = { ff15???????? 6a10 6a01 68???????? 68???????? } // n = 5, score = 500 // ff15???????? | // 6a10 | mov byte ptr [ebp - 1], 0x30 // 6a01 | test eax, eax // 68???????? | // 68???????? | $sequence_29 = { 68???????? e8???????? 8b35???????? 83c404 6a00 } // n = 5, score = 500 // 68???????? | // e8???????? | // 8b35???????? | // 83c404 | push 0 // 6a00 | call esi $sequence_30 = { 7cd5 68???????? e8???????? 8b4dfc } // n = 4, score = 400 // 7cd5 | push 0x100 // 68???????? | // e8???????? | // 8b4dfc | push 0 $sequence_31 = { 6a00 ffd6 8b4dfc 5f 5e 33cd b8???????? } // n = 7, score = 400 // 6a00 | push 0 // ffd6 | add esp, 4 // 8b4dfc | push 0 // 5f | push -1 // 5e | push 0 // 33cd | push 0 // b8???????? | $sequence_32 = { ff512c 8bce 8bd8 e8???????? 57 ff15???????? } // n = 6, score = 200 // ff512c | jmp 0xf // 8bce | push 0x493e0 // 8bd8 | push ebx // e8???????? | // 57 | push esi // ff15???????? | $sequence_33 = { 8d443001 6a00 51 50 56 57 } // n = 6, score = 200 // 8d443001 | call esi // 6a00 | mov dword ptr [ecx + 0x140], eax // 51 | test eax, eax // 50 | push 6 // 56 | push 2 // 57 | push 0 $sequence_34 = { 53 56 57 c785ecfeffff01000000 c785e8feffffe197af54 0f6e85e8feffff 0f72f002 } // n = 7, score = 200 // 53 | call esi // 56 | call eax // 57 | pop esi // c785ecfeffff01000000 | test eax, eax // c785e8feffffe197af54 | call esi // 0f6e85e8feffff | mov dword ptr [ecx + 0x168], eax // 0f72f002 | test eax, eax $sequence_35 = { 57 894df0 ff15???????? 8945fc 8b45f0 } // n = 5, score = 200 // 57 | push edi // 894df0 | push edi // ff15???????? | // 8945fc | push eax // 8b45f0 | call dword ptr [ecx + 0x2c] $sequence_36 = { 6a06 6a02 6a00 6a00 6800000040 68???????? } // n = 6, score = 200 // 6a06 | push ecx // 6a02 | sub dword ptr [ebp + 8], 4 // 6a00 | push ebx // 6a00 | push esi // 6800000040 | mov ebp, esp // 68???????? | $sequence_37 = { 8bec 83ec24 53 56 57 c745dce197af54 } // n = 6, score = 200 // 8bec | pslld mm0, 2 // 83ec24 | lea eax, dword ptr [eax + esi + 1] // 53 | push 0 // 56 | push ecx // 57 | push eax // c745dce197af54 | push esi $sequence_38 = { 68???????? e8???????? 85c0 7402 eb0d 68e0930400 } // n = 6, score = 200 // 68???????? | // e8???????? | // 85c0 | mov esi, dword ptr [ebp + 0xc] // 7402 | jl 0xffffffe2 // eb0d | pop esi // 68e0930400 | test eax, eax $sequence_39 = { 52 57 50 ff512c 8bce 8bd8 } // n = 6, score = 200 // 52 | push ecx // 57 | sub dword ptr [ebp + 8], 4 // 50 | push ebx // ff512c | sub dword ptr [ebp + 8], 4 // 8bce | push ebx // 8bd8 | push esi $sequence_40 = { 5b 83c424 c21000 49 51 } // n = 5, score = 100 // 5b | pop esi // 83c424 | call esi // c21000 | mov ecx, dword ptr [ebp - 4] // 49 | pop edi // 51 | pop esi $sequence_41 = { c6003d 8b4c2420 89742424 c6043100 4f 75b3 } // n = 6, score = 100 // c6003d | push 0 // 8b4c2420 | call esi // 89742424 | mov ecx, dword ptr [ebp - 4] // c6043100 | pop edi // 4f | pop esi // 75b3 | xor ecx, ebp $sequence_42 = { 0f84b1000000 8a542413 56 8d4c242c } // n = 4, score = 100 // 0f84b1000000 | push 0 // 8a542413 | call esi // 56 | mov ecx, dword ptr [ebp - 4] // 8d4c242c | pop edi $sequence_43 = { c7442414d4522500 51 8d4c2434 ff15???????? 8d542430 } // n = 5, score = 100 // c7442414d4522500 | push 0x100 // 51 | push 0 // 8d4c2434 | pop ebx // ff15???????? | // 8d542430 | push 0x100 $sequence_44 = { 895e08 895e0c 68???????? 895c2420 } // n = 4, score = 100 // 895e08 | pop ebx // 895e0c | mov ecx, dword ptr [ebp - 4] // 68???????? | // 895c2420 | pop edi $sequence_45 = { 8a18 8b02 8b542424 2bc2 83f801 } // n = 5, score = 100 // 8a18 | xor ecx, ebp // 8b02 | mov ecx, dword ptr [ebp - 4] // 8b542424 | pop edi // 2bc2 | pop esi // 83f801 | xor ecx, ebp $sequence_46 = { 897de4 ff15???????? 84c0 7425 8bcf 8b7b04 8bc1 } // n = 7, score = 100 // 897de4 | push 0 // ff15???????? | // 84c0 | mov ecx, dword ptr [ebp - 4] // 7425 | pop edi // 8bcf | pop esi // 8b7b04 | xor ecx, ebp // 8bc1 | push 0 $sequence_47 = { e8???????? 8a55ef 83ec10 8bf4 } // n = 4, score = 100 // e8???????? | // 8a55ef | pop esi // 83ec10 | xor ecx, ebp // 8bf4 | pop ebx condition: 7 of them and filesize < 1586176 }
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