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 = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { c645ff30 e8???????? 85c0 7505 } // n = 4, score = 2600 // c645ff30 | mov byte ptr [ebp - 1], 0x30 // e8???????? | // 85c0 | test eax, eax // 7505 | jne 7 $sequence_1 = { 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_2 = { 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_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 = { e8???????? 89450c 56 85c0 } // n = 4, score = 2600 // e8???????? | // 89450c | mov dword ptr [ebp + 0xc], eax // 56 | push esi // 85c0 | test eax, eax $sequence_5 = { 50 68???????? 6a0d 68???????? } // n = 4, score = 2500 // 50 | push eax // 68???????? | // 6a0d | push 0xd // 68???????? | $sequence_6 = { 7ce0 a1???????? 5e 85c0 } // n = 4, score = 2400 // 7ce0 | jl 0xffffffe2 // a1???????? | // 5e | pop esi // 85c0 | test eax, eax $sequence_7 = { 7411 6a04 68???????? 68???????? e8???????? } // n = 5, score = 2400 // 7411 | je 0x13 // 6a04 | push 4 // 68???????? | // 68???????? | // e8???????? | $sequence_8 = { 51 6802020000 68???????? 50 } // n = 4, score = 2400 // 51 | push ecx // 6802020000 | push 0x202 // 68???????? | // 50 | push eax $sequence_9 = { b8f2eeeeee 8b4df0 64890d00000000 59 5f 5e 5b } // n = 7, score = 2200 // b8f2eeeeee | mov eax, 0xeeeeeef2 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_10 = { ff15???????? 83c604 81fe???????? 7ce0 a1???????? } // n = 5, score = 2200 // ff15???????? | // 83c604 | add esi, 4 // 81fe???????? | // 7ce0 | jl 0xffffffe2 // a1???????? | $sequence_11 = { be???????? 8b06 85c0 740f 50 } // n = 5, score = 2200 // be???????? | // 8b06 | mov eax, dword ptr [esi] // 85c0 | test eax, eax // 740f | je 0x11 // 50 | push eax $sequence_12 = { 56 8b35???????? 85c0 741a 50 } // n = 5, score = 2200 // 56 | push esi // 8b35???????? | // 85c0 | test eax, eax // 741a | je 0x1c // 50 | push eax $sequence_13 = { ffd6 8b0d???????? 894124 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 894124 | mov dword ptr [ecx + 0x24], eax // 85c0 | test eax, eax $sequence_14 = { ffd6 8b0d???????? 898198000000 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 898198000000 | mov dword ptr [ecx + 0x98], eax // 85c0 | test eax, eax $sequence_15 = { 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_16 = { ff90a8010000 85c0 7405 e8???????? } // n = 4, score = 500 // ff90a8010000 | xor eax, eax // 85c0 | dec eax // 7405 | mov ecx, dword ptr [esp + 0x50] // e8???????? | $sequence_17 = { ba10270000 488b0d???????? 488b05???????? ff5010 } // n = 4, score = 500 // ba10270000 | call dword ptr [eax + 0x2c8] // 488b0d???????? | // 488b05???????? | // ff5010 | test eax, eax $sequence_18 = { 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_19 = { c744242004000000 4533c9 4533c0 ba00000080 } // n = 4, score = 500 // c744242004000000 | inc ebp // 4533c9 | xor eax, eax // 4533c0 | mov edx, 0xc0000000 // ba00000080 | inc ebp $sequence_20 = { 68???????? e8???????? 8b35???????? 83c404 6a00 } // n = 5, score = 500 // 68???????? | // e8???????? | // 8b35???????? | // 83c404 | call esi // 6a00 | mov ecx, dword ptr [ebp - 4] $sequence_21 = { 488b4c2450 488b05???????? ff90c8020000 85c0 } // n = 4, score = 500 // 488b4c2450 | inc ecx // 488b05???????? | // ff90c8020000 | mov ecx, 3 // 85c0 | inc ebp $sequence_22 = { 6a00 68???????? 6aff 68???????? 6a00 } // n = 5, score = 500 // 6a00 | test eax, eax // 68???????? | // 6aff | add esi, 4 // 68???????? | // 6a00 | jl 0xffffffe2 $sequence_23 = { 4533c0 ba000000c0 488b0d???????? 488b05???????? } // n = 4, score = 500 // 4533c0 | call dword ptr [eax + 0x1a8] // ba000000c0 | test eax, eax // 488b0d???????? | // 488b05???????? | $sequence_24 = { 6800010000 6a00 68???????? e8???????? 6800020000 6a00 } // n = 6, score = 500 // 6800010000 | pop edi // 6a00 | pop esi // 68???????? | // e8???????? | // 6800020000 | add esp, 0xc // 6a00 | mov eax, 0xeeeeeef7 $sequence_25 = { 4889442420 41b906000200 4533c0 488b15???????? 48c7c101000080 488b05???????? } // n = 6, score = 500 // 4889442420 | mov eax, 0xeeeeeef6 // 41b906000200 | mov ecx, dword ptr [ebp - 0x10] // 4533c0 | mov dword ptr fs:[0], ecx // 488b15???????? | // 48c7c101000080 | pop ecx // 488b05???????? | $sequence_26 = { 4533c0 33d2 488bc8 488b05???????? } // n = 4, score = 500 // 4533c0 | je 9 // 33d2 | mov edx, 0x2710 // 488bc8 | call dword ptr [eax + 0x10] // 488b05???????? | $sequence_27 = { 68???????? 6a00 6a00 ffd6 8b4dfc 5f } // n = 6, score = 500 // 68???????? | // 6a00 | push 0x100 // 6a00 | push 0 // ffd6 | push 0x200 // 8b4dfc | add esp, 4 // 5f | push 0 $sequence_28 = { ffd6 50 68???????? 6aff } // n = 4, score = 500 // ffd6 | call esi // 50 | push 0x100 // 68???????? | // 6aff | push 0 $sequence_29 = { ffd6 8b4dfc 5f 5e 33cd b8???????? } // n = 6, score = 400 // ffd6 | push 0 // 8b4dfc | call esi // 5f | push eax // 5e | push -1 // 33cd | push 0 // b8???????? | $sequence_30 = { 7cd5 68???????? e8???????? 8b4dfc } // n = 4, score = 400 // 7cd5 | push -1 // 68???????? | // e8???????? | // 8b4dfc | push 0 $sequence_31 = { 75f9 2bcf 3bf1 7cd4 68???????? } // n = 5, score = 300 // 75f9 | jl 0xffffffd7 // 2bcf | mov ecx, dword ptr [ebp - 4] // 3bf1 | add esp, 4 // 7cd4 | call esi // 68???????? | $sequence_32 = { 68???????? e8???????? 83c40c b901000000 } // n = 4, score = 300 // 68???????? | // e8???????? | // 83c40c | xor ecx, ebp // b901000000 | pop ebx $sequence_33 = { 741f 6a07 68???????? e8???????? } // n = 4, score = 200 // 741f | je 0x21 // 6a07 | push 7 // 68???????? | // e8???????? | $sequence_34 = { 8b85e4feffff 8945f0 8b4df0 e8???????? } // n = 4, score = 200 // 8b85e4feffff | mov eax, dword ptr [ebp - 0x11c] // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // e8???????? | $sequence_35 = { 8b06 50 8b08 ff9180000000 8b06 } // n = 5, score = 200 // 8b06 | mov eax, dword ptr [esi] // 50 | push eax // 8b08 | mov ecx, dword ptr [eax] // ff9180000000 | call dword ptr [ecx + 0x80] // 8b06 | mov eax, dword ptr [esi] $sequence_36 = { 68???????? e8???????? 85c0 7402 eb0d 68e0930400 ff15???????? } // n = 7, score = 200 // 68???????? | // e8???????? | // 85c0 | test eax, eax // 7402 | je 4 // eb0d | jmp 0xf // 68e0930400 | push 0x493e0 // ff15???????? | $sequence_37 = { 57 50 ff512c 8bce 8bd8 e8???????? 57 } // n = 7, score = 200 // 57 | push edi // 50 | push eax // ff512c | call dword ptr [ecx + 0x2c] // 8bce | mov ecx, esi // 8bd8 | mov ebx, eax // e8???????? | // 57 | push edi $sequence_38 = { 83ec24 53 56 57 c745dce197af54 0f6e45dc 0f72f002 } // n = 7, score = 200 // 83ec24 | sub esp, 0x24 // 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_39 = { 56 57 894df0 ff15???????? 8945fc } // n = 5, score = 200 // 56 | push esi // 57 | push edi // 894df0 | mov dword ptr [ebp - 0x10], ecx // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax $sequence_40 = { 53 56 57 c785ecfeffff01000000 c785e8feffffe197af54 0f6e85e8feffff } // n = 6, score = 200 // 53 | push ebx // 56 | push esi // 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_41 = { a1???????? 8d4c241c 8d54242c 51 52 56 } // n = 6, score = 100 // a1???????? | // 8d4c241c | push ebx // 8d54242c | mov dword ptr [esp + 0x14], ebx // 51 | mov cl, byte ptr [esp + 0x13] // 52 | mov byte ptr [esp + 0x28], cl // 56 | lea ecx, [esp + 0x28] $sequence_42 = { ff15???????? 8b15???????? 8d4d98 8b02 50 6a00 } // n = 6, score = 100 // ff15???????? | // 8b15???????? | // 8d4d98 | mov cl, byte ptr [ebp - 0x68] // 8b02 | sub esp, 0x10 // 50 | mov esi, esp // 6a00 | mov dword ptr [ebp - 0x24], esp $sequence_43 = { 83f801 7706 ff15???????? 8b4c2424 6a00 8d7901 } // n = 6, score = 100 // 83f801 | xor ebp, ebp // 7706 | mov esi, dword ptr [esp + 0x3c] // ff15???????? | // 8b4c2424 | mov dl, byte ptr [esp + 0x1c] // 6a00 | mov byte ptr [esi], dl // 8d7901 | mov dword ptr [esi + 4], ebp $sequence_44 = { 8b54242c 0fbec3 03d1 8ae0 8802 8b542428 } // n = 6, score = 100 // 8b54242c | push 0 // 0fbec3 | dec edi // 03d1 | jne 0xffffffb6 // 8ae0 | xor ebp, ebp // 8802 | mov esi, dword ptr [esp + 0x3c] // 8b542428 | mov dl, byte ptr [esp + 0x1c] $sequence_45 = { 4f 75b3 33ed 8b74243c 8a54241c } // n = 5, score = 100 // 4f | pop ecx // 75b3 | pop edi // 33ed | test eax, eax // 8b74243c | jne 7 // 8a54241c | pop ebx $sequence_46 = { ff15???????? 53 895c2414 8a4c2413 884c2428 8d4c2428 } // n = 6, score = 100 // ff15???????? | // 53 | mov edx, dword ptr [esp + 0x28] // 895c2414 | mov dword ptr [esp + 0x2c], esi // 8a4c2413 | mov byte ptr [edx + esi], 0 // 884c2428 | inc edi // 8d4c2428 | mov byte ptr [ebp - 4], 6 $sequence_47 = { 8b542428 8974242c c6043200 47 } // n = 4, score = 100 // 8b542428 | mov eax, 0xeeeeeef6 // 8974242c | mov ecx, dword ptr [ebp - 0x10] // c6043200 | mov dword ptr fs:[0], ecx // 47 | pop ecx $sequence_48 = { c645fc06 ff15???????? 8a4d98 83ec10 8bf4 8965dc 6a00 } // n = 7, score = 100 // c645fc06 | pop edi // ff15???????? | // 8a4d98 | pop esi // 83ec10 | add esp, 0xc // 8bf4 | mov eax, 1 // 8965dc | mov ecx, dword ptr [ebp - 0x10] // 6a00 | mov dword ptr fs:[0], ecx condition: 7 of them and filesize < 1586176 }
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