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rule win_icedid_downloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "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 = { 740a 83c002 663910 75eb } // n = 4, score = 400 // 740a | je 0xc // 83c002 | add eax, 2 // 663910 | cmp word ptr [eax], dx // 75eb | jne 0xffffffed $sequence_1 = { 8b4d08 8901 33c0 40 8be5 } // n = 5, score = 400 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8901 | mov dword ptr [ecx], eax // 33c0 | xor eax, eax // 40 | inc eax // 8be5 | mov esp, ebp $sequence_2 = { 83c8ff 668954242c 6689442434 8d54242c 8b442414 } // n = 5, score = 400 // 83c8ff | or eax, 0xffffffff // 668954242c | mov word ptr [esp + 0x2c], dx // 6689442434 | mov word ptr [esp + 0x34], ax // 8d54242c | lea edx, [esp + 0x2c] // 8b442414 | mov eax, dword ptr [esp + 0x14] $sequence_3 = { 85f6 7412 ff7558 e8???????? } // n = 4, score = 400 // 85f6 | test esi, esi // 7412 | je 0x14 // ff7558 | push dword ptr [ebp + 0x58] // e8???????? | $sequence_4 = { e8???????? 8d45b4 897518 50 68???????? c7451c40000000 } // n = 6, score = 400 // e8???????? | // 8d45b4 | lea eax, [ebp - 0x4c] // 897518 | mov dword ptr [ebp + 0x18], esi // 50 | push eax // 68???????? | // c7451c40000000 | mov dword ptr [ebp + 0x1c], 0x40 $sequence_5 = { 8bf8 56 8d442420 50 8b11 } // n = 5, score = 400 // 8bf8 | mov edi, eax // 56 | push esi // 8d442420 | lea eax, [esp + 0x20] // 50 | push eax // 8b11 | mov edx, dword ptr [ecx] $sequence_6 = { e8???????? 85c0 7847 395df4 7442 8d45f8 50 } // n = 7, score = 400 // e8???????? | // 85c0 | test eax, eax // 7847 | js 0x49 // 395df4 | cmp dword ptr [ebp - 0xc], ebx // 7442 | je 0x44 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax $sequence_7 = { 8bfc 6a04 8b08 a5 50 a5 } // n = 6, score = 400 // 8bfc | mov edi, esp // 6a04 | push 4 // 8b08 | mov ecx, dword ptr [eax] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // 50 | push eax // a5 | movsd dword ptr es:[edi], dword ptr [esi] $sequence_8 = { 53 8d45f0 66c745e80010 50 33db 6800000002 } // n = 6, score = 400 // 53 | push ebx // 8d45f0 | lea eax, [ebp - 0x10] // 66c745e80010 | mov word ptr [ebp - 0x18], 0x1000 // 50 | push eax // 33db | xor ebx, ebx // 6800000002 | push 0x2000000 $sequence_9 = { 8b4e08 8b4718 3b4108 7520 ff36 } // n = 5, score = 400 // 8b4e08 | mov ecx, dword ptr [esi + 8] // 8b4718 | mov eax, dword ptr [edi + 0x18] // 3b4108 | cmp eax, dword ptr [ecx + 8] // 7520 | jne 0x22 // ff36 | push dword ptr [esi] condition: 7 of them and filesize < 40960 }
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