Actor(s): Sofacy
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rule win_sedreco_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 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_2 = { e8???????? 89450c 56 85c0 } // n = 4, score = 2600 // e8???????? | // 89450c | mov dword ptr [ebp + 0xc], eax // 56 | push esi // 85c0 | test eax, eax $sequence_3 = { 8bec 51 836d0804 53 56 } // n = 5, score = 2600 // 8bec | mov ebp, esp // 51 | push ecx // 836d0804 | sub dword ptr [ebp + 8], 4 // 53 | push ebx // 56 | push esi $sequence_4 = { 50 68???????? 6a0d 68???????? } // n = 4, score = 2500 // 50 | push eax // 68???????? | // 6a0d | push 0xd // 68???????? | $sequence_5 = { 7411 6a04 68???????? 68???????? } // n = 4, score = 2400 // 7411 | je 0x13 // 6a04 | push 4 // 68???????? | // 68???????? | $sequence_6 = { 51 6802020000 68???????? 50 } // n = 4, score = 2400 // 51 | push ecx // 6802020000 | push 0x202 // 68???????? | // 50 | push eax $sequence_7 = { 7ce0 a1???????? 5e 85c0 } // n = 4, score = 2400 // 7ce0 | jl 0xffffffe2 // a1???????? | // 5e | pop esi // 85c0 | test eax, eax $sequence_8 = { ffd6 8b0d???????? 894108 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 894108 | mov dword ptr [ecx + 8], eax // 85c0 | test eax, eax $sequence_9 = { ff15???????? 83c604 81fe???????? 7ce0 a1???????? } // n = 5, score = 2200 // ff15???????? | // 83c604 | add esi, 4 // 81fe???????? | // 7ce0 | jl 0xffffffe2 // a1???????? | $sequence_10 = { ffd6 8b0d???????? 8981e4000000 85c0 } // n = 4, score = 2200 // ffd6 | call esi // 8b0d???????? | // 8981e4000000 | mov dword ptr [ecx + 0xe4], eax // 85c0 | test eax, eax $sequence_11 = { e8???????? 83c40c b801000000 8b4df0 64890d00000000 59 5f } // n = 7, score = 2200 // e8???????? | // 83c40c | add esp, 0xc // b801000000 | mov eax, 1 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5f | pop edi $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 = { ff15???????? 8906 8bf0 85f6 } // n = 4, score = 1900 // ff15???????? | // 8906 | mov dword ptr [esi], eax // 8bf0 | mov esi, eax // 85f6 | test esi, esi $sequence_14 = { 50 68???????? 6aff 68???????? 6a00 6a00 ffd6 } // n = 7, score = 500 // 50 | mov dword ptr [ebp + 0xc], eax // 68???????? | // 6aff | push esi // 68???????? | // 6a00 | test eax, eax // 6a00 | push ebp // ffd6 | mov ebp, esp $sequence_15 = { ff90e8000000 488b0d???????? 488b05???????? ff5028 } // n = 4, score = 500 // ff90e8000000 | inc ebp // 488b0d???????? | // 488b05???????? | // ff5028 | xor eax, eax $sequence_16 = { ffd6 50 68???????? 6aff } // n = 4, score = 500 // ffd6 | push ebp // 50 | mov ebp, esp // 68???????? | // 6aff | push ecx $sequence_17 = { 6800010000 6a00 68???????? e8???????? 6800020000 6a00 } // n = 6, score = 500 // 6800010000 | push eax // 6a00 | jl 0xffffffe2 // 68???????? | // e8???????? | // 6800020000 | pop esi // 6a00 | test eax, eax $sequence_18 = { ff90e0000000 488b0d???????? 488b05???????? ff90a8010000 } // n = 4, score = 500 // ff90e0000000 | ret // 488b0d???????? | // 488b05???????? | // ff90a8010000 | dec eax $sequence_19 = { eb04 4883c010 4883c428 c3 48890d???????? c3 48895c2410 } // n = 7, score = 500 // eb04 | dec eax // 4883c010 | mov dword ptr [esp + 0x20], eax // 4883c428 | inc ecx // c3 | mov ecx, 3 // 48890d???????? | // c3 | inc ebp // 48895c2410 | xor eax, eax $sequence_20 = { 68???????? e8???????? 8b35???????? 83c404 6a00 } // n = 5, score = 500 // 68???????? | // e8???????? | // 8b35???????? | // 83c404 | sub dword ptr [ebp + 8], 4 // 6a00 | push ebx $sequence_21 = { 8b35???????? 83c404 6a00 68???????? 6aff 68???????? } // n = 6, score = 500 // 8b35???????? | // 83c404 | push ecx // 6a00 | sub dword ptr [ebp + 8], 4 // 68???????? | // 6aff | mov ebp, esp // 68???????? | $sequence_22 = { 33d2 33c9 488b05???????? ff90f0000000 } // n = 4, score = 500 // 33d2 | dec eax // 33c9 | mov ecx, 0x80000001 // 488b05???????? | // ff90f0000000 | call dword ptr [eax + 0x138] $sequence_23 = { ff90e8000000 ba10270000 488b0d???????? 488b05???????? ff5010 85c0 } // n = 6, score = 500 // ff90e8000000 | xor edx, edx // ba10270000 | xor ecx, ecx // 488b0d???????? | // 488b05???????? | // ff5010 | call dword ptr [eax + 0xf0] // 85c0 | call dword ptr [eax + 0xe8] $sequence_24 = { 4533c0 ba00000080 488b0d???????? 488b05???????? ff5040 } // n = 5, score = 500 // 4533c0 | mov edx, 0x2710 // ba00000080 | call dword ptr [eax + 0x10] // 488b0d???????? | // 488b05???????? | // ff5040 | test eax, eax $sequence_25 = { 89442428 488b442450 4889442420 41b903000000 4533c0 488b15???????? } // n = 6, score = 500 // 89442428 | call dword ptr [eax + 0x28] // 488b442450 | inc ebp // 4889442420 | xor ecx, ecx // 41b903000000 | inc ebp // 4533c0 | xor eax, eax // 488b15???????? | $sequence_26 = { 41b906000200 4533c0 488b15???????? 48c7c101000080 488b05???????? ff9038010000 } // n = 6, score = 500 // 41b906000200 | inc ecx // 4533c0 | mov ecx, 0x20006 // 488b15???????? | // 48c7c101000080 | inc ebp // 488b05???????? | // ff9038010000 | xor eax, eax $sequence_27 = { ffd6 8b4dfc 5f 5e 33cd b8???????? 5b } // n = 7, score = 400 // ffd6 | push 0 // 8b4dfc | push -1 // 5f | add esp, 4 // 5e | push 0 // 33cd | push -1 // b8???????? | // 5b | push 0 $sequence_28 = { 7cd5 68???????? e8???????? 8b4dfc } // n = 4, score = 400 // 7cd5 | push 0 // 68???????? | // e8???????? | // 8b4dfc | push 0 $sequence_29 = { b930000000 e8???????? 50 ffd7 a3???????? 85c0 } // n = 6, score = 300 // b930000000 | pop edi // e8???????? | // 50 | push -1 // ffd7 | push 0 // a3???????? | // 85c0 | push 0 $sequence_30 = { 6a01 68???????? 68???????? 8d45f8 50 } // n = 5, score = 300 // 6a01 | pop edi // 68???????? | // 68???????? | // 8d45f8 | push 0 // 50 | push 0 $sequence_31 = { 53 56 57 c785ecfeffff01000000 c785e8feffffe197af54 } // n = 5, 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 $sequence_32 = { 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_33 = { 894df0 ff15???????? 8945fc 8b45f0 8945f4 8b45f4 } // n = 6, score = 200 // 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_34 = { c785ecfeffff01000000 c785e8feffffe197af54 0f6e85e8feffff 0f72f002 } // n = 4, score = 200 // 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_35 = { 8b85ecfeffff 8b4df4 64890d00000000 5f 5e 5b } // n = 6, score = 200 // 8b85ecfeffff | mov eax, dword ptr [ebp - 0x114] // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_36 = { 56 57 c745dce197af54 0f6e45dc } // n = 4, score = 200 // 56 | push esi // 57 | push edi // c745dce197af54 | mov dword ptr [ebp - 0x24], 0x54af97e1 // 0f6e45dc | movd mm0, dword ptr [ebp - 0x24] $sequence_37 = { 741f 6a07 68???????? e8???????? 85c0 7402 eb0d } // n = 7, score = 200 // 741f | je 0x21 // 6a07 | push 7 // 68???????? | // e8???????? | // 85c0 | test eax, eax // 7402 | je 4 // eb0d | jmp 0xf $sequence_38 = { 52 57 50 ff512c 8bce 8bd8 e8???????? } // n = 7, score = 200 // 52 | push edx // 57 | push edi // 50 | push eax // ff512c | call dword ptr [ecx + 0x2c] // 8bce | mov ecx, esi // 8bd8 | mov ebx, eax // e8???????? | $sequence_39 = { 8b5608 c706???????? 52 ff15???????? 56 } // n = 5, score = 100 // 8b5608 | mov edx, 0xc0000000 // c706???????? | // 52 | call dword ptr [eax + 0x40] // ff15???????? | // 56 | dec eax $sequence_40 = { ff15???????? 8b75e8 e8???????? 6a00 6a00 6a00 6a00 } // n = 7, score = 100 // ff15???????? | // 8b75e8 | call dword ptr [eax + 0x1a8] // e8???????? | // 6a00 | call dword ptr [eax + 0xe8] // 6a00 | call dword ptr [eax + 0xe8] // 6a00 | mov edx, 0x2710 // 6a00 | inc ebp $sequence_41 = { 8b4c2420 3bce 66ab 741c 8a41ff 84c0 740b } // n = 7, score = 100 // 8b4c2420 | mov ecx, 0x20006 // 3bce | inc ebp // 66ab | xor eax, eax // 741c | dec eax // 8a41ff | mov ecx, 0x80000001 // 84c0 | call dword ptr [eax + 0x138] // 740b | call dword ptr [eax + 0xe0] $sequence_42 = { c6043900 8b442440 45 3be8 7c8e 83fe03 7d54 } // n = 7, score = 100 // c6043900 | add eax, 0x10 // 8b442440 | dec eax // 45 | add esp, 0x28 // 3be8 | ret // 7c8e | ret // 83fe03 | dec eax // 7d54 | mov dword ptr [esp + 0x10], ebx $sequence_43 = { 51 52 8944242c 53 c74424280c000000 8944242c c744243001000000 } // n = 7, score = 100 // 51 | call dword ptr [eax + 0xe8] // 52 | mov edx, 0x2710 // 8944242c | call dword ptr [eax + 0x10] // 53 | dec eax // c74424280c000000 | add esp, 0x28 // 8944242c | ret // c744243001000000 | ret $sequence_44 = { 8b54242c 8a5c3c14 8b08 2bca 83f901 7706 } // n = 6, score = 100 // 8b54242c | mov dword ptr [esp + 0x18], esi // 8a5c3c14 | push ebp // 8b08 | inc ebp // 2bca | xor ecx, ecx // 83f901 | inc ebp // 7706 | xor eax, eax $sequence_45 = { 8806 895e04 895e08 895e0c 68???????? 895c2420 } // n = 6, score = 100 // 8806 | dec eax // 895e04 | mov dword ptr [esp + 0x18], esi // 895e08 | dec eax // 895e0c | mov dword ptr [esp + 0x20], eax // 68???????? | // 895c2420 | inc ecx $sequence_46 = { 6a00 8d4da8 8845a8 ff15???????? } // n = 4, score = 100 // 6a00 | dec eax // 8d4da8 | mov dword ptr [esp + 0x10], ebx // 8845a8 | dec eax // ff15???????? | condition: 7 of them and filesize < 1586176 }
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