Actor(s): Mirage
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rule win_tidepool_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" version = "1" description = "Detects win.tidepool." 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.tidepool" malpedia_rule_date = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 8bc6 5e c20400 80790800 c701???????? 740e } // n = 6, score = 1000 // 8bc6 | mov eax, esi // 5e | pop esi // c20400 | ret 4 // 80790800 | cmp byte ptr [ecx + 8], 0 // c701???????? | // 740e | je 0x10 $sequence_1 = { 5e 5b 8b8d00030000 33cd e8???????? 81c504030000 } // n = 6, score = 1000 // 5e | pop esi // 5b | pop ebx // 8b8d00030000 | mov ecx, dword ptr [ebp + 0x300] // 33cd | xor ecx, ebp // e8???????? | // 81c504030000 | add ebp, 0x304 $sequence_2 = { 6a00 50 8b08 ff91a4000000 } // n = 4, score = 1000 // 6a00 | push 0 // 50 | push eax // 8b08 | mov ecx, dword ptr [eax] // ff91a4000000 | call dword ptr [ecx + 0xa4] $sequence_3 = { 64890d00000000 59 5f 5e 5b 8b8d00030000 } // n = 6, score = 1000 // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5f | pop edi // 5e | pop esi // 5b | pop ebx // 8b8d00030000 | mov ecx, dword ptr [ebp + 0x300] $sequence_4 = { 83c40c 803d????????37 7518 68???????? } // n = 4, score = 900 // 83c40c | add esp, 0xc // 803d????????37 | // 7518 | jne 0x1a // 68???????? | $sequence_5 = { 33db 53 6a02 8bf1 e8???????? } // n = 5, score = 900 // 33db | xor ebx, ebx // 53 | push ebx // 6a02 | push 2 // 8bf1 | mov esi, ecx // e8???????? | $sequence_6 = { 6800000040 8d4500 50 ff15???????? } // n = 4, score = 900 // 6800000040 | push 0x40000000 // 8d4500 | lea eax, [ebp] // 50 | push eax // ff15???????? | $sequence_7 = { 2bc8 83e906 51 83c006 50 } // n = 5, score = 900 // 2bc8 | sub ecx, eax // 83e906 | sub ecx, 6 // 51 | push ecx // 83c006 | add eax, 6 // 50 | push eax $sequence_8 = { 57 50 6802020000 ff15???????? 68???????? ff15???????? 8bf8 } // n = 7, score = 800 // 57 | push edi // 50 | push eax // 6802020000 | push 0x202 // ff15???????? | // 68???????? | // ff15???????? | // 8bf8 | mov edi, eax $sequence_9 = { 52 8d5658 52 50 } // n = 4, score = 800 // 52 | push edx // 8d5658 | lea edx, [esi + 0x58] // 52 | push edx // 50 | push eax $sequence_10 = { 8d9698000000 52 8d5678 8b08 } // n = 4, score = 800 // 8d9698000000 | lea edx, [esi + 0x98] // 52 | push edx // 8d5678 | lea edx, [esi + 0x78] // 8b08 | mov ecx, dword ptr [eax] $sequence_11 = { 50 ff91d0000000 33ff 8b4654 } // n = 4, score = 800 // 50 | push eax // ff91d0000000 | call dword ptr [ecx + 0xd0] // 33ff | xor edi, edi // 8b4654 | mov eax, dword ptr [esi + 0x54] $sequence_12 = { 681f000200 56 68???????? 6801000080 } // n = 4, score = 800 // 681f000200 | push 0x2001f // 56 | push esi // 68???????? | // 6801000080 | push 0x80000001 $sequence_13 = { 8d45ec 50 681f000200 53 68???????? } // n = 5, score = 800 // 8d45ec | lea eax, [ebp - 0x14] // 50 | push eax // 681f000200 | push 0x2001f // 53 | push ebx // 68???????? | $sequence_14 = { e8???????? 68???????? 68???????? 68???????? 8d4500 50 } // n = 6, score = 800 // e8???????? | // 68???????? | // 68???????? | // 68???????? | // 8d4500 | lea eax, [ebp] // 50 | push eax $sequence_15 = { 6810270000 ff15???????? 8b45ec 8b08 } // n = 4, score = 800 // 6810270000 | push 0x2710 // ff15???????? | // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8b08 | mov ecx, dword ptr [eax] $sequence_16 = { 83ff14 7509 8b4654 50 8b08 ff5138 47 } // n = 7, score = 800 // 83ff14 | cmp edi, 0x14 // 7509 | jne 0xb // 8b4654 | mov eax, dword ptr [esi + 0x54] // 50 | push eax // 8b08 | mov ecx, dword ptr [eax] // ff5138 | call dword ptr [ecx + 0x38] // 47 | inc edi $sequence_17 = { ff25???????? 56 6800000300 6800000100 33f6 56 e8???????? } // n = 7, score = 800 // ff25???????? | // 56 | push esi // 6800000300 | push 0x30000 // 6800000100 | push 0x10000 // 33f6 | xor esi, esi // 56 | push esi // e8???????? | $sequence_18 = { 40 49 75f9 b8???????? b900000400 c60000 40 } // n = 7, score = 800 // 40 | inc eax // 49 | dec ecx // 75f9 | jne 0xfffffffb // b8???????? | // b900000400 | mov ecx, 0x40000 // c60000 | mov byte ptr [eax], 0 // 40 | inc eax $sequence_19 = { c3 56 8bf1 e8???????? 8b4654 6a00 } // n = 6, score = 800 // c3 | ret // 56 | push esi // 8bf1 | mov esi, ecx // e8???????? | // 8b4654 | mov eax, dword ptr [esi + 0x54] // 6a00 | push 0 $sequence_20 = { 57 7514 8bc1 8d7001 8a10 83c001 3ad3 } // n = 7, score = 600 // 57 | push edi // 7514 | jne 0x16 // 8bc1 | mov eax, ecx // 8d7001 | lea esi, [eax + 1] // 8a10 | mov dl, byte ptr [eax] // 83c001 | add eax, 1 // 3ad3 | cmp dl, bl $sequence_21 = { 8948fd 0f85bdfdffff 8b442418 8b4c2424 3bc1 0f8d78020000 } // n = 6, score = 600 // 8948fd | mov dword ptr [eax - 3], ecx // 0f85bdfdffff | jne 0xfffffdc3 // 8b442418 | mov eax, dword ptr [esp + 0x18] // 8b4c2424 | mov ecx, dword ptr [esp + 0x24] // 3bc1 | cmp eax, ecx // 0f8d78020000 | jge 0x27e $sequence_22 = { ff75ec ff15???????? 8b35???????? 6a04 } // n = 4, score = 400 // ff75ec | push dword ptr [ebp - 0x14] // ff15???????? | // 8b35???????? | // 6a04 | push 4 $sequence_23 = { ff5618 6a00 ff561c 6a01 58 } // n = 5, score = 200 // ff5618 | call dword ptr [esi + 0x18] // 6a00 | push 0 // ff561c | call dword ptr [esi + 0x1c] // 6a01 | push 1 // 58 | pop eax $sequence_24 = { a1???????? 8d55f4 53 52 8b08 50 } // n = 6, score = 200 // a1???????? | // 8d55f4 | lea edx, [ebp - 0xc] // 53 | push ebx // 52 | push edx // 8b08 | mov ecx, dword ptr [eax] // 50 | push eax $sequence_25 = { 393d???????? 59 59 7507 32c0 } // n = 5, score = 200 // 393d???????? | // 59 | pop ecx // 59 | pop ecx // 7507 | jne 9 // 32c0 | xor al, al $sequence_26 = { 53 55 ff15???????? 8d442418 } // n = 4, score = 200 // 53 | push ebx // 55 | push ebp // ff15???????? | // 8d442418 | lea eax, [esp + 0x18] $sequence_27 = { 8d45ec 50 53 e8???????? 8d5e01 53 } // n = 6, score = 200 // 8d45ec | lea eax, [ebp - 0x14] // 50 | push eax // 53 | push ebx // e8???????? | // 8d5e01 | lea ebx, [esi + 1] // 53 | push ebx $sequence_28 = { 56 33ff 8945ec ff15???????? } // n = 4, score = 200 // 56 | push esi // 33ff | xor edi, edi // 8945ec | mov dword ptr [ebp - 0x14], eax // ff15???????? | condition: 7 of them and filesize < 1998848 }
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