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rule win_atomsilo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.atomsilo." 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.atomsilo" 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 = { f348ab 488bca e8???????? 90 488d4d20 e8???????? 488bc6 } // n = 7, score = 100 // f348ab | dec eax // 488bca | lea ecx, [esp + 0x30] // e8???????? | // 90 | dec eax // 488d4d20 | mov edx, dword ptr [esp + 0x40] // e8???????? | // 488bc6 | dec esp $sequence_1 = { 57 4156 4157 488d6c24d0 4881ec30010000 48c7442438feffffff 48899c2470010000 } // n = 7, score = 100 // 57 | mov ebp, edx // 4156 | dec esp // 4157 | mov esi, ecx // 488d6c24d0 | dec eax // 4881ec30010000 | lea eax, [0x33e12] // 48c7442438feffffff | dec eax // 48899c2470010000 | mov dword ptr [ecx], eax $sequence_2 = { e8???????? 90 b9c0010000 bab8010000 488b83c0010000 483983b8010000 0f42ca } // n = 7, score = 100 // e8???????? | // 90 | dec eax // b9c0010000 | lea edx, [0x22e40] // bab8010000 | vsubsd xmm4, xmm1, xmm2 // 488b83c0010000 | les eax, ptr [ecx - 0x3ef3a6a5] // 483983b8010000 | vmovapd xmm5, xmm1 // 0f42ca | dec esp $sequence_3 = { 4e8b5401f8 4d85d2 4e897439f8 4d8937 440f44e8 4b8d0c2f 493bc8 } // n = 7, score = 100 // 4e8b5401f8 | mov ebx, eax // 4d85d2 | dec eax // 4e897439f8 | mov dword ptr [ecx + 8], ebx // 4d8937 | dec ecx // 440f44e8 | mov ecx, eax // 4b8d0c2f | dec esp // 493bc8 | mov esi, dword ptr [esp + 0x88] $sequence_4 = { ff5008 0fb6e8 488b542440 4883fa10 7232 48ffc2 488b4c2428 } // n = 7, score = 100 // ff5008 | test eax, eax // 0fb6e8 | nop // 488b542440 | dec eax // 4883fa10 | mov ecx, dword ptr [ebp + 0x30] // 7232 | dec eax // 48ffc2 | cmp dword ptr [ebp + 0x28], ecx // 488b4c2428 | dec eax $sequence_5 = { 4c8d34cd00000000 488b4b08 4a833c3100 7516 b910000000 e8???????? 488b4b08 } // n = 7, score = 100 // 4c8d34cd00000000 | cmp edx, eax // 488b4b08 | dec esp // 4a833c3100 | mov ecx, ecx // 7516 | dec esp // b910000000 | cmovb eax, edx // e8???????? | // 488b4b08 | dec ebp $sequence_6 = { f30f7f442468 4885ff 7410 488b07 4885c0 7408 488b00 } // n = 7, score = 100 // f30f7f442468 | mov ecx, eax // 4885ff | dec esp // 7410 | mov eax, dword ptr [ebp + 0x88] // 488b07 | dec eax // 4885c0 | mov edx, dword ptr [ebp + 0x28] // 7408 | dec eax // 488b00 | mov ecx, dword ptr [ebp + 0x78] $sequence_7 = { 4055 4883ec20 488bea 8b8590010000 83e004 85c0 7410 } // n = 7, score = 100 // 4055 | dec eax // 4883ec20 | mov eax, esi // 488bea | add al, 0xd // 8b8590010000 | xor eax, 0x4d // 83e004 | mov byte ptr [esp + 0x61], al // 85c0 | mov eax, dword ptr [esp + 0x50] // 7410 | add al, 0xe $sequence_8 = { 896f48 48c74758ffffffff 48896f60 48896f68 488bd3 488bcf e8???????? } // n = 7, score = 100 // 896f48 | dec eax // 48c74758ffffffff | sub eax, 1 // 48896f60 | jne 0x1298 // 48896f68 | dec eax // 488bd3 | mov ecx, dword ptr [esp + 0x58] // 488bcf | dec eax // e8???????? | $sequence_9 = { 4584ff 0f44c3 4c8d9c2490000000 498b5b20 498b6b30 498b7338 } // n = 6, score = 100 // 4584ff | dec eax // 0f44c3 | lea ecx, [esp + 0x28] // 4c8d9c2490000000 | nop // 498b5b20 | dec eax // 498b6b30 | lea edx, [0x66e13] // 498b7338 | dec eax condition: 7 of them and filesize < 1785856 }
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