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rule win_icedid_downloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.icedid_downloader." 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.icedid_downloader" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 8d45e4 50 e8???????? 85c0 0f8895000000 } // n = 5, score = 400 // 8d45e4 | lea eax, [ebp - 0x1c] // 50 | push eax // e8???????? | // 85c0 | test eax, eax // 0f8895000000 | js 0x9b $sequence_1 = { e8???????? 8d45c8 bf???????? 50 57 e8???????? } // n = 6, score = 400 // e8???????? | // 8d45c8 | lea eax, [ebp - 0x38] // bf???????? | // 50 | push eax // 57 | push edi // e8???????? | $sequence_2 = { e8???????? 85f6 740c 8b4508 3b07 7505 } // n = 6, score = 400 // e8???????? | // 85f6 | test esi, esi // 740c | je 0xe // 8b4508 | mov eax, dword ptr [ebp + 8] // 3b07 | cmp eax, dword ptr [edi] // 7505 | jne 7 $sequence_3 = { 50 6802000080 ffd7 5f 8bc6 5e 5d } // n = 7, score = 400 // 50 | push eax // 6802000080 | push 0x80000002 // ffd7 | call edi // 5f | pop edi // 8bc6 | mov eax, esi // 5e | pop esi // 5d | pop ebp $sequence_4 = { b8???????? 50 55 50 8d442424 50 56 } // n = 7, score = 400 // b8???????? | // 50 | push eax // 55 | push ebp // 50 | push eax // 8d442424 | lea eax, [esp + 0x24] // 50 | push eax // 56 | push esi $sequence_5 = { ff5150 8b45fc 8d75c4 83ec10 } // n = 4, score = 400 // ff5150 | call dword ptr [ecx + 0x50] // 8b45fc | mov eax, dword ptr [ebp - 4] // 8d75c4 | lea esi, [ebp - 0x3c] // 83ec10 | sub esp, 0x10 $sequence_6 = { 53 55 33ed 33db 43 896c2410 55 } // n = 7, score = 400 // 53 | push ebx // 55 | push ebp // 33ed | xor ebp, ebp // 33db | xor ebx, ebx // 43 | inc ebx // 896c2410 | mov dword ptr [esp + 0x10], ebp // 55 | push ebp $sequence_7 = { ff15???????? 6a05 5b 8d4554 c7450001000000 50 } // n = 6, score = 400 // ff15???????? | // 6a05 | push 5 // 5b | pop ebx // 8d4554 | lea eax, [ebp + 0x54] // c7450001000000 | mov dword ptr [ebp], 1 // 50 | push eax $sequence_8 = { 8bf8 56 8d442420 50 8b11 56 56 } // n = 7, score = 400 // 8bf8 | mov edi, eax // 56 | push esi // 8d442420 | lea eax, [esp + 0x20] // 50 | push eax // 8b11 | mov edx, dword ptr [ecx] // 56 | push esi // 56 | push esi $sequence_9 = { 83c410 8d442410 53 50 53 } // n = 5, score = 400 // 83c410 | add esp, 0x10 // 8d442410 | lea eax, [esp + 0x10] // 53 | push ebx // 50 | push eax // 53 | push ebx condition: 7 of them and filesize < 40960 }
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