Actor(s): Sofacy
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rule win_sedreco_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-11-21" 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 = "20221118" malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af" malpedia_version = "20221125" 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 = { 55 8bec 51 836d0804 53 56 8b750c } // n = 7, score = 2600 // 55 | push ebp // 8bec | mov ebp, esp // 51 | push ecx // 836d0804 | sub dword ptr [ebp + 8], 4 // 53 | push ebx // 56 | push esi // 8b750c | mov esi, dword ptr [ebp + 0xc] $sequence_2 = { c645ff30 e8???????? 85c0 7505 } // n = 4, score = 2600 // c645ff30 | mov byte ptr [ebp - 1], 0x30 // e8???????? | // 85c0 | test eax, eax // 7505 | jne 7 $sequence_3 = { 8b750c 56 e8???????? 6a08 } // n = 4, score = 2600 // 8b750c | mov esi, dword ptr [ebp + 0xc] // 56 | push esi // e8???????? | // 6a08 | push 8 $sequence_4 = { 50 68???????? 6a0d 68???????? } // n = 4, score = 2500 // 50 | push eax // 68???????? | // 6a0d | push 0xd // 68???????? | $sequence_5 = { 7411 6a04 68???????? 68???????? e8???????? } // n = 5, score = 2400 // 7411 | je 0x13 // 6a04 | push 4 // 68???????? | // 68???????? | // e8???????? | $sequence_6 = { 7ce0 a1???????? 5e 85c0 } // n = 4, score = 2400 // 7ce0 | jl 0xffffffe2 // a1???????? | // 5e | pop esi // 85c0 | test eax, eax $sequence_7 = { 51 6802020000 68???????? 50 } // n = 4, score = 2400 // 51 | push ecx // 6802020000 | push 0x202 // 68???????? | // 50 | push eax $sequence_8 = { 57 8b3d???????? 56 683f000f00 6a00 } // n = 5, score = 2200 // 57 | push edi // 8b3d???????? | // 56 | push esi // 683f000f00 | push 0xf003f // 6a00 | push 0 $sequence_9 = { 83c40c b8f2eeeeee 8b4df0 64890d00000000 59 5f } // n = 6, score = 2200 // 83c40c | add esp, 0xc // b8f2eeeeee | mov eax, 0xeeeeeef2 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5f | pop edi $sequence_10 = { ff15???????? 83c604 81fe???????? 7ce0 a1???????? } // n = 5, score = 2200 // ff15???????? | // 83c604 | add esi, 4 // 81fe???????? | // 7ce0 | jl 0xffffffe2 // a1???????? | $sequence_11 = { 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_12 = { ffd6 8b0d???????? 898158010000 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 898158010000 | mov dword ptr [ecx + 0x158], eax // 85c0 | test eax, eax $sequence_13 = { 8bf0 85f6 7429 6afe 8d45f0 } // n = 5, score = 2200 // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 7429 | je 0x2b // 6afe | push -2 // 8d45f0 | lea eax, [ebp - 0x10] $sequence_14 = { 833d????????00 750c 833d????????00 7503 33c0 c3 } // n = 6, score = 1800 // 833d????????00 | // 750c | jne 0xe // 833d????????00 | // 7503 | jne 5 // 33c0 | xor eax, eax // c3 | ret $sequence_15 = { 6a01 68???????? ff35???????? ff15???????? ffd0 } // n = 5, score = 1100 // 6a01 | push 1 // 68???????? | // ff35???????? | // ff15???????? | // ffd0 | call eax $sequence_16 = { 6800010000 6a00 68???????? e8???????? 6800020000 6a00 } // n = 6, score = 500 // 6800010000 | add esi, 4 // 6a00 | jl 0xffffffe5 // 68???????? | // e8???????? | // 6800020000 | pop esi // 6a00 | test eax, eax $sequence_17 = { 50 68???????? 6aff 68???????? 6a00 } // n = 5, score = 500 // 50 | pop edi // 68???????? | // 6aff | je 0x2e // 68???????? | // 6a00 | test eax, eax $sequence_18 = { 33d2 488d4c2450 488b05???????? ff90d8020000 } // n = 4, score = 500 // 33d2 | call dword ptr [eax + 0x48] // 488d4c2450 | je 7 // 488b05???????? | // ff90d8020000 | xor edx, edx $sequence_19 = { 488b4c2450 488b05???????? ff90c8020000 85c0 } // n = 4, score = 500 // 488b4c2450 | dec eax // 488b05???????? | // ff90c8020000 | mov ecx, dword ptr [esp + 0x50] // 85c0 | call dword ptr [eax + 0x2c8] $sequence_20 = { ba10270000 488b0d???????? 488b05???????? ff5010 85c0 } // n = 5, score = 500 // ba10270000 | call dword ptr [eax + 0x2d8] // 488b0d???????? | // 488b05???????? | // ff5010 | call dword ptr [eax + 0x118] // 85c0 | je 7 $sequence_21 = { 488b15???????? 488d4c2438 e8???????? 89442430 } // n = 4, score = 500 // 488b15???????? | // 488d4c2438 | test eax, eax // e8???????? | // 89442430 | dec eax $sequence_22 = { ff90f0000000 488905???????? 488b05???????? ff5048 } // n = 4, score = 500 // ff90f0000000 | lea ecx, [esp + 0x38] // 488905???????? | // 488b05???????? | // ff5048 | mov dword ptr [esp + 0x30], eax $sequence_23 = { e8???????? 48833d????????00 7405 e8???????? } // n = 4, score = 500 // e8???????? | // 48833d????????00 | // 7405 | call dword ptr [eax + 0xf0] // e8???????? | $sequence_24 = { 68???????? 6a00 6a00 ffd6 50 68???????? } // n = 6, score = 500 // 68???????? | // 6a00 | lea eax, [ebp - 0x10] // 6a00 | push eax // ffd6 | call esi // 50 | mov dword ptr [ecx + 0x158], eax // 68???????? | $sequence_25 = { eb04 4883c010 4883c428 c3 48890d???????? } // n = 5, score = 500 // eb04 | mov edx, 0x2710 // 4883c010 | call dword ptr [eax + 0x10] // 4883c428 | test eax, eax // c3 | jmp 6 // 48890d???????? | $sequence_26 = { 33c0 4883c428 c3 48895c2408 57 4883ec20 498bd8 } // n = 7, score = 500 // 33c0 | add esp, 0x28 // 4883c428 | ret // c3 | ret // 48895c2408 | dec eax // 57 | mov dword ptr [esp + 0x10], ebx // 4883ec20 | dec eax // 498bd8 | mov dword ptr [esp + 0x18], esi $sequence_27 = { 8b35???????? 83c404 6a00 68???????? 6aff } // n = 5, score = 500 // 8b35???????? | // 83c404 | push 0 // 6a00 | push 0 // 68???????? | // 6aff | call esi $sequence_28 = { 7cd5 68???????? e8???????? 8b4dfc 83c404 } // n = 5, score = 400 // 7cd5 | push 0 // 68???????? | // e8???????? | // 8b4dfc | call esi // 83c404 | mov ecx, dword ptr [ebp - 4] $sequence_29 = { ffd6 8b4dfc 5f 5e 33cd b8???????? } // n = 6, score = 400 // ffd6 | push 0 // 8b4dfc | push 0 // 5f | push -1 // 5e | push 0 // 33cd | push 0 // b8???????? | $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???????? 83c40c b901000000 e8???????? } // n = 4, score = 300 // e8???????? | // 83c40c | xor ecx, ebp // b901000000 | pop ebx // e8???????? | $sequence_32 = { 33c9 e8???????? 8b3d???????? 50 ffd7 a3???????? } // n = 6, score = 300 // 33c9 | mov ecx, dword ptr [ebp - 4] // e8???????? | // 8b3d???????? | // 50 | pop edi // ffd7 | pop esi // a3???????? | $sequence_33 = { 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_34 = { 83fefd 742b 8a4a01 3a4801 751a 83fefe } // n = 6, score = 300 // 83fefd | mov ecx, dword ptr [ebp - 4] // 742b | pop edi // 8a4a01 | pop esi // 3a4801 | xor ecx, ebp // 751a | push 0 // 83fefe | call esi $sequence_35 = { 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_36 = { 751a 83fefe 741e 8a4a02 3a4802 750d } // n = 6, score = 300 // 751a | mov ecx, dword ptr [ebp - 4] // 83fefe | pop edi // 741e | pop esi // 8a4a02 | xor ecx, ebp // 3a4802 | pop ebx // 750d | pop ebx $sequence_37 = { 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_38 = { 8b08 52 57 50 ff512c 8bce 8bd8 } // n = 7, score = 200 // 8b08 | mov ecx, dword ptr [eax] // 52 | push edx // 57 | push edi // 50 | push eax // ff512c | call dword ptr [ecx + 0x2c] // 8bce | mov ecx, esi // 8bd8 | mov ebx, eax $sequence_39 = { 57 894df0 ff15???????? 8945fc 8b45f0 8945f4 8b45f4 } // n = 7, 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 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] $sequence_40 = { 50 ff512c 8bf0 f7de } // n = 4, score = 200 // 50 | push eax // ff512c | call dword ptr [ecx + 0x2c] // 8bf0 | mov esi, eax // f7de | neg esi $sequence_41 = { 57 c745dce197af54 0f6e45dc 0f72f002 } // n = 4, score = 200 // 57 | push edi // c745dce197af54 | mov dword ptr [ebp - 0x24], 0x54af97e1 // 0f6e45dc | movd mm0, dword ptr [ebp - 0x24] // 0f72f002 | pslld mm0, 2 $sequence_42 = { 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_43 = { 81ec24010000 53 56 57 c785ecfeffff01000000 c785e8feffffe197af54 } // n = 6, score = 200 // 81ec24010000 | sub esp, 0x124 // 53 | push ebx // 56 | push esi // 57 | push edi // c785ecfeffff01000000 | mov dword ptr [ebp - 0x114], 1 // c785e8feffffe197af54 | mov dword ptr [ebp - 0x118], 0x54af97e1 $sequence_44 = { 68???????? e8???????? 85c0 7402 eb0d } // n = 5, score = 200 // 68???????? | // e8???????? | // 85c0 | test eax, eax // 7402 | je 4 // eb0d | jmp 0xf $sequence_45 = { ff512c 8bce 8bd8 e8???????? 57 ff15???????? 5f } // n = 7, score = 200 // ff512c | call dword ptr [ecx + 0x2c] // 8bce | mov ecx, esi // 8bd8 | mov ebx, eax // e8???????? | // 57 | push edi // ff15???????? | // 5f | pop edi $sequence_46 = { 8d4c2424 8b02 50 57 51 8bce } // n = 6, score = 100 // 8d4c2424 | call esi // 8b02 | mov dword ptr [ecx + 8], eax // 50 | test eax, eax // 57 | push edx // 51 | push eax // 8bce | mov ecx, dword ptr [esp + 0x10] $sequence_47 = { 51 52 50 8bce e8???????? 50 ffd7 } // n = 7, score = 100 // 51 | mov edx, dword ptr [esi + 0x2c] // 52 | push ecx // 50 | mov ecx, dword ptr [esp + 0x87c] // 8bce | mov ecx, 0x107 // e8???????? | // 50 | xor eax, eax // ffd7 | lea edi, [esp + 0x43c] $sequence_48 = { 894610 56 68???????? 8d442428 6a00 } // n = 5, score = 100 // 894610 | add esi, 4 // 56 | jl 0xffffffe2 // 68???????? | // 8d442428 | pop esi // 6a00 | test eax, eax $sequence_49 = { 8a4c2413 884c2428 8d4c2428 ff15???????? 8d542434 52 } // n = 6, score = 100 // 8a4c2413 | add esi, 4 // 884c2428 | jl 0xffffffe2 // 8d4c2428 | pop esi // ff15???????? | // 8d542434 | test eax, eax // 52 | mov eax, 0xeeeeeef2 $sequence_50 = { 52 50 ff15???????? 8b4c2410 8b562c 51 } // n = 6, score = 100 // 52 | jl 0xffffffe2 // 50 | pop esi // ff15???????? | // 8b4c2410 | add esi, 4 // 8b562c | jl 0xffffffe2 // 51 | add esi, 4 $sequence_51 = { 8b442410 8b4e2c 8b1d???????? 50 } // n = 4, score = 100 // 8b442410 | test eax, eax // 8b4e2c | je 0x15 // 8b1d???????? | // 50 | push eax $sequence_52 = { ff15???????? 6a01 8d4c242c c684244410000000 ff15???????? 8d4c2414 8d542438 } // n = 7, score = 100 // ff15???????? | // 6a01 | mov ecx, dword ptr [ebp - 0x10] // 8d4c242c | mov dword ptr fs:[0], ecx // c684244410000000 | pop ecx // ff15???????? | // 8d4c2414 | pop edi // 8d542438 | pop esi $sequence_53 = { 8b8c247c080000 e8???????? b907010000 33c0 8dbc243c040000 } // n = 5, score = 100 // 8b8c247c080000 | jl 0xffffffe2 // e8???????? | // b907010000 | pop esi // 33c0 | push esi // 8dbc243c040000 | mov eax, dword ptr [esi] condition: 7 of them and filesize < 1586176 }
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