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rule win_icedid_downloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { ffd5 85f6 0f85fb000000 8d442440 50 68???????? e8???????? } // n = 7, score = 400 // ffd5 | call ebp // 85f6 | test esi, esi // 0f85fb000000 | jne 0x101 // 8d442440 | lea eax, [esp + 0x40] // 50 | push eax // 68???????? | // e8???????? | $sequence_1 = { c745f000100000 50 6a00 8d45f4 50 6aff } // n = 6, score = 400 // c745f000100000 | mov dword ptr [ebp - 0x10], 0x1000 // 50 | push eax // 6a00 | push 0 // 8d45f4 | lea eax, [ebp - 0xc] // 50 | push eax // 6aff | push -1 $sequence_2 = { 83c410 33f6 56 56 6a02 56 } // n = 6, score = 400 // 83c410 | add esp, 0x10 // 33f6 | xor esi, esi // 56 | push esi // 56 | push esi // 6a02 | push 2 // 56 | push esi $sequence_3 = { 43 896c2410 55 896c2410 896c2418 896c241c } // n = 6, score = 400 // 43 | inc ebx // 896c2410 | mov dword ptr [esp + 0x10], ebp // 55 | push ebp // 896c2410 | mov dword ptr [esp + 0x10], ebp // 896c2418 | mov dword ptr [esp + 0x18], ebp // 896c241c | mov dword ptr [esp + 0x1c], ebp $sequence_4 = { 50 6a08 6aff 885c241c ff15???????? 85c0 0f840f010000 } // n = 7, score = 400 // 50 | push eax // 6a08 | push 8 // 6aff | push -1 // 885c241c | mov byte ptr [esp + 0x1c], bl // ff15???????? | // 85c0 | test eax, eax // 0f840f010000 | je 0x115 $sequence_5 = { 8d442428 50 ff742438 ff15???????? 8d442440 50 68???????? } // n = 7, score = 400 // 8d442428 | lea eax, [esp + 0x28] // 50 | push eax // ff742438 | push dword ptr [esp + 0x38] // ff15???????? | // 8d442440 | lea eax, [esp + 0x40] // 50 | push eax // 68???????? | $sequence_6 = { 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_7 = { ff75f4 ff15???????? 8b45fc ff701c } // n = 4, score = 400 // ff75f4 | push dword ptr [ebp - 0xc] // ff15???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] // ff701c | push dword ptr [eax + 0x1c] $sequence_8 = { 33c0 eb46 8d442440 50 68???????? e8???????? } // n = 6, score = 400 // 33c0 | xor eax, eax // eb46 | jmp 0x48 // 8d442440 | lea eax, [esp + 0x40] // 50 | push eax // 68???????? | // e8???????? | $sequence_9 = { 395df0 0f8424010000 56 8d45d0 c745d00c000000 8945cc 8d45fc } // n = 7, score = 400 // 395df0 | cmp dword ptr [ebp - 0x10], ebx // 0f8424010000 | je 0x12a // 56 | push esi // 8d45d0 | lea eax, [ebp - 0x30] // c745d00c000000 | mov dword ptr [ebp - 0x30], 0xc // 8945cc | mov dword ptr [ebp - 0x34], eax // 8d45fc | lea eax, [ebp - 4] condition: 7 of them and filesize < 40960 }
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