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rule win_icefog_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 80e3fb 899588feffff 33d2 80c327 85ff 0f94c2 85d2 } // n = 7, score = 200 // 80e3fb | and bl, 0xfb // 899588feffff | mov dword ptr [ebp - 0x178], edx // 33d2 | xor edx, edx // 80c327 | add bl, 0x27 // 85ff | test edi, edi // 0f94c2 | sete dl // 85d2 | test edx, edx $sequence_1 = { c78530ffffff05000000 eb0f 83f803 750a c78530ffffff02000000 8b4604 50 } // n = 7, score = 200 // c78530ffffff05000000 | mov dword ptr [ebp - 0xd0], 5 // eb0f | jmp 0x11 // 83f803 | cmp eax, 3 // 750a | jne 0xc // c78530ffffff02000000 | mov dword ptr [ebp - 0xd0], 2 // 8b4604 | mov eax, dword ptr [esi + 4] // 50 | push eax $sequence_2 = { 751e 8b4d0c 8d450c 50 57 51 e8???????? } // n = 7, score = 200 // 751e | jne 0x20 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 8d450c | lea eax, [ebp + 0xc] // 50 | push eax // 57 | push edi // 51 | push ecx // e8???????? | $sequence_3 = { 8bec 53 56 33f6 39770c 7e24 33db } // n = 7, score = 200 // 8bec | mov ebp, esp // 53 | push ebx // 56 | push esi // 33f6 | xor esi, esi // 39770c | cmp dword ptr [edi + 0xc], esi // 7e24 | jle 0x26 // 33db | xor ebx, ebx $sequence_4 = { 8b5108 8b45f4 03d3 52 53 50 6a03 } // n = 7, score = 200 // 8b5108 | mov edx, dword ptr [ecx + 8] // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 03d3 | add edx, ebx // 52 | push edx // 53 | push ebx // 50 | push eax // 6a03 | push 3 $sequence_5 = { 50 e8???????? 8b0e 8d55d4 68ffffff7f 52 894de8 } // n = 7, score = 200 // 50 | push eax // e8???????? | // 8b0e | mov ecx, dword ptr [esi] // 8d55d4 | lea edx, [ebp - 0x2c] // 68ffffff7f | push 0x7fffffff // 52 | push edx // 894de8 | mov dword ptr [ebp - 0x18], ecx $sequence_6 = { 8b5610 0bf8 8b4508 52 50 e8???????? 8b4e18 } // n = 7, score = 200 // 8b5610 | mov edx, dword ptr [esi + 0x10] // 0bf8 | or edi, eax // 8b4508 | mov eax, dword ptr [ebp + 8] // 52 | push edx // 50 | push eax // e8???????? | // 8b4e18 | mov ecx, dword ptr [esi + 0x18] $sequence_7 = { 50 51 e8???????? 8bd8 83c408 85db 0f841b010000 } // n = 7, score = 200 // 50 | push eax // 51 | push ecx // e8???????? | // 8bd8 | mov ebx, eax // 83c408 | add esp, 8 // 85db | test ebx, ebx // 0f841b010000 | je 0x121 $sequence_8 = { e8???????? 53 e8???????? 53 57 e8???????? 83c42c } // n = 7, score = 200 // e8???????? | // 53 | push ebx // e8???????? | // 53 | push ebx // 57 | push edi // e8???????? | // 83c42c | add esp, 0x2c $sequence_9 = { dfe0 ddd9 f6c441 0f8572010000 dd05???????? d8d1 dfe0 } // n = 7, score = 200 // dfe0 | fnstsw ax // ddd9 | fstp st(1) // f6c441 | test ah, 0x41 // 0f8572010000 | jne 0x178 // dd05???????? | // d8d1 | fcom st(1) // dfe0 | fnstsw ax condition: 7 of them and filesize < 1187840 }
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