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rule win_icedid_downloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 6a04 8b08 a5 50 a5 a5 a5 } // n = 7, score = 400 // 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] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] $sequence_1 = { ffd3 8b4c2418 8bf8 8d442414 50 } // n = 5, score = 400 // ffd3 | call ebx // 8b4c2418 | mov ecx, dword ptr [esp + 0x18] // 8bf8 | mov edi, eax // 8d442414 | lea eax, [esp + 0x14] // 50 | push eax $sequence_2 = { e8???????? 83c40c 8975d4 8d45d4 50 ff15???????? } // n = 6, score = 400 // e8???????? | // 83c40c | add esp, 0xc // 8975d4 | mov dword ptr [ebp - 0x2c], esi // 8d45d4 | lea eax, [ebp - 0x2c] // 50 | push eax // ff15???????? | $sequence_3 = { 55 55 55 83c8ff 50 55 } // n = 6, score = 400 // 55 | push ebp // 55 | push ebp // 55 | push ebp // 83c8ff | or eax, 0xffffffff // 50 | push eax // 55 | push ebp $sequence_4 = { eb02 47 4e 803f00 75f9 53 } // n = 6, score = 400 // eb02 | jmp 4 // 47 | inc edi // 4e | dec esi // 803f00 | cmp byte ptr [edi], 0 // 75f9 | jne 0xfffffffb // 53 | push ebx $sequence_5 = { 50 68???????? e8???????? 8b1d???????? 8d442448 59 59 } // n = 7, score = 400 // 50 | push eax // 68???????? | // e8???????? | // 8b1d???????? | // 8d442448 | lea eax, [esp + 0x48] // 59 | pop ecx // 59 | pop ecx $sequence_6 = { ffd7 8d842494000000 896c2410 50 68???????? } // n = 5, score = 400 // ffd7 | call edi // 8d842494000000 | lea eax, [esp + 0x94] // 896c2410 | mov dword ptr [esp + 0x10], ebp // 50 | push eax // 68???????? | $sequence_7 = { e8???????? 85c0 0f8584000000 8b85e8feffff 8b7508 } // n = 5, score = 400 // e8???????? | // 85c0 | test eax, eax // 0f8584000000 | jne 0x8a // 8b85e8feffff | mov eax, dword ptr [ebp - 0x118] // 8b7508 | mov esi, dword ptr [ebp + 8] $sequence_8 = { a5 a5 ff5150 8b45fc 8d75c4 83ec10 8bfc } // n = 7, score = 400 // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // ff5150 | call dword ptr [ecx + 0x50] // 8b45fc | mov eax, dword ptr [ebp - 4] // 8d75c4 | lea esi, [ebp - 0x3c] // 83ec10 | sub esp, 0x10 // 8bfc | mov edi, esp $sequence_9 = { b805400080 eb76 ff7508 ff15???????? } // n = 4, score = 400 // b805400080 | mov eax, 0x80004005 // eb76 | jmp 0x78 // ff7508 | push dword ptr [ebp + 8] // ff15???????? | condition: 7 of them and filesize < 40960 }
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