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rule win_icefog_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.icefog." 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.icefog" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { c3 56 8b750c b862000000 3bf1 7403 0fb606 } // n = 7, score = 200 // c3 | ret // 56 | push esi // 8b750c | mov esi, dword ptr [ebp + 0xc] // b862000000 | mov eax, 0x62 // 3bf1 | cmp esi, ecx // 7403 | je 5 // 0fb606 | movzx eax, byte ptr [esi] $sequence_1 = { c680e200000000 8b4e04 51 57 e8???????? eb42 6a00 } // n = 7, score = 200 // c680e200000000 | mov byte ptr [eax + 0xe2], 0 // 8b4e04 | mov ecx, dword ptr [esi + 4] // 51 | push ecx // 57 | push edi // e8???????? | // eb42 | jmp 0x44 // 6a00 | push 0 $sequence_2 = { e8???????? 83c414 8945e8 837de400 0f84f1010000 8b45e0 8b4de8 } // n = 7, score = 200 // e8???????? | // 83c414 | add esp, 0x14 // 8945e8 | mov dword ptr [ebp - 0x18], eax // 837de400 | cmp dword ptr [ebp - 0x1c], 0 // 0f84f1010000 | je 0x1f7 // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] $sequence_3 = { 8945f4 7414 53 6a00 6a02 8bc7 8bce } // n = 7, score = 200 // 8945f4 | mov dword ptr [ebp - 0xc], eax // 7414 | je 0x16 // 53 | push ebx // 6a00 | push 0 // 6a02 | push 2 // 8bc7 | mov eax, edi // 8bce | mov ecx, esi $sequence_4 = { 8b551c 8b4d24 89471c 895710 894f20 5f } // n = 6, score = 200 // 8b551c | mov edx, dword ptr [ebp + 0x1c] // 8b4d24 | mov ecx, dword ptr [ebp + 0x24] // 89471c | mov dword ptr [edi + 0x1c], eax // 895710 | mov dword ptr [edi + 0x10], edx // 894f20 | mov dword ptr [edi + 0x20], ecx // 5f | pop edi $sequence_5 = { e8???????? 83c408 897e70 8b4e70 014e48 83564c00 8b4dfc } // n = 7, score = 200 // e8???????? | // 83c408 | add esp, 8 // 897e70 | mov dword ptr [esi + 0x70], edi // 8b4e70 | mov ecx, dword ptr [esi + 0x70] // 014e48 | add dword ptr [esi + 0x48], ecx // 83564c00 | adc dword ptr [esi + 0x4c], 0 // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_6 = { 8bf1 f706feffffff 57 8bd8 7605 e8???????? 8d04dd00000000 } // n = 7, score = 200 // 8bf1 | mov esi, ecx // f706feffffff | test dword ptr [esi], 0xfffffffe // 57 | push edi // 8bd8 | mov ebx, eax // 7605 | jbe 7 // e8???????? | // 8d04dd00000000 | lea eax, [ebx*8] $sequence_7 = { e8???????? e9???????? 8b56e4 8b4604 8b4ef4 52 50 } // n = 7, score = 200 // e8???????? | // e9???????? | // 8b56e4 | mov edx, dword ptr [esi - 0x1c] // 8b4604 | mov eax, dword ptr [esi + 4] // 8b4ef4 | mov ecx, dword ptr [esi - 0xc] // 52 | push edx // 50 | push eax $sequence_8 = { 8b4dfc 33cd e8???????? 8be5 5d c3 668b8c4bb0000000 } // n = 7, score = 200 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 33cd | xor ecx, ebp // e8???????? | // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 668b8c4bb0000000 | mov cx, word ptr [ebx + ecx*2 + 0xb0] $sequence_9 = { 8bf0 8bfa e8???????? 895dfc 894df8 df6df8 c745f800c0692a } // n = 7, score = 200 // 8bf0 | mov esi, eax // 8bfa | mov edi, edx // e8???????? | // 895dfc | mov dword ptr [ebp - 4], ebx // 894df8 | mov dword ptr [ebp - 8], ecx // df6df8 | fild qword ptr [ebp - 8] // c745f800c0692a | mov dword ptr [ebp - 8], 0x2a69c000 condition: 7 of them and filesize < 1187840 }
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