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rule win_icedid_downloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { eb1c 83f803 7519 8b06 } // n = 4, score = 400 // eb1c | jmp 0x1e // 83f803 | cmp eax, 3 // 7519 | jne 0x1b // 8b06 | mov eax, dword ptr [esi] $sequence_1 = { e8???????? 8365f400 8d45b0 8945f8 64a118000000 59 59 } // n = 7, score = 400 // e8???????? | // 8365f400 | and dword ptr [ebp - 0xc], 0 // 8d45b0 | lea eax, [ebp - 0x50] // 8945f8 | mov dword ptr [ebp - 8], eax // 64a118000000 | mov eax, dword ptr fs:[0x18] // 59 | pop ecx // 59 | pop ecx $sequence_2 = { 8d4568 50 8d4558 50 8d45c8 6a04 } // n = 6, score = 400 // 8d4568 | lea eax, [ebp + 0x68] // 50 | push eax // 8d4558 | lea eax, [ebp + 0x58] // 50 | push eax // 8d45c8 | lea eax, [ebp - 0x38] // 6a04 | push 4 $sequence_3 = { 8d75d4 33c0 c745dc00330000 6a16 } // n = 4, score = 400 // 8d75d4 | lea esi, [ebp - 0x2c] // 33c0 | xor eax, eax // c745dc00330000 | mov dword ptr [ebp - 0x24], 0x3300 // 6a16 | push 0x16 $sequence_4 = { ff7508 895dfc 895df4 895df8 895dec 895de4 } // n = 6, score = 400 // ff7508 | push dword ptr [ebp + 8] // 895dfc | mov dword ptr [ebp - 4], ebx // 895df4 | mov dword ptr [ebp - 0xc], ebx // 895df8 | mov dword ptr [ebp - 8], ebx // 895dec | mov dword ptr [ebp - 0x14], ebx // 895de4 | mov dword ptr [ebp - 0x1c], ebx $sequence_5 = { ffd7 ff15???????? 83f87a 0f85e9000000 8b442410 85c0 0f84dd000000 } // n = 7, score = 400 // ffd7 | call edi // ff15???????? | // 83f87a | cmp eax, 0x7a // 0f85e9000000 | jne 0xef // 8b442410 | mov eax, dword ptr [esp + 0x10] // 85c0 | test eax, eax // 0f84dd000000 | je 0xe3 $sequence_6 = { 894528 8d4518 50 ff15???????? } // n = 4, score = 400 // 894528 | mov dword ptr [ebp + 0x28], eax // 8d4518 | lea eax, [ebp + 0x18] // 50 | push eax // ff15???????? | $sequence_7 = { 89442408 8944240c 8bf0 8944241c 8d442408 } // n = 5, score = 400 // 89442408 | mov dword ptr [esp + 8], eax // 8944240c | mov dword ptr [esp + 0xc], eax // 8bf0 | mov esi, eax // 8944241c | mov dword ptr [esp + 0x1c], eax // 8d442408 | lea eax, [esp + 8] $sequence_8 = { 50 53 53 53 6a04 ff75fc e8???????? } // n = 7, score = 400 // 50 | push eax // 53 | push ebx // 53 | push ebx // 53 | push ebx // 6a04 | push 4 // ff75fc | push dword ptr [ebp - 4] // e8???????? | $sequence_9 = { 6689442434 8d54242c 8b442414 52 57 } // n = 5, score = 400 // 6689442434 | mov word ptr [esp + 0x34], ax // 8d54242c | lea edx, [esp + 0x2c] // 8b442414 | mov eax, dword ptr [esp + 0x14] // 52 | push edx // 57 | push edi condition: 7 of them and filesize < 40960 }
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