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rule win_seasalt_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.seasalt." 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.seasalt" 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 = { 888800d90010 eb1f 83f861 7213 } // n = 4, score = 100 // 888800d90010 | mov byte ptr [eax + 0x1000d900], cl // eb1f | jmp 0x21 // 83f861 | cmp eax, 0x61 // 7213 | jb 0x15 $sequence_1 = { a3???????? 3bc6 7513 68e0930400 ff15???????? 8975fc } // n = 6, score = 100 // a3???????? | // 3bc6 | cmp eax, esi // 7513 | jne 0x15 // 68e0930400 | push 0x493e0 // ff15???????? | // 8975fc | mov dword ptr [ebp - 4], esi $sequence_2 = { 83d8ff 3bc3 758c b901040000 33c0 } // n = 5, score = 100 // 83d8ff | sbb eax, -1 // 3bc3 | cmp eax, ebx // 758c | jne 0xffffff8e // b901040000 | mov ecx, 0x401 // 33c0 | xor eax, eax $sequence_3 = { f2ae a1???????? 68???????? f7d1 } // n = 4, score = 100 // f2ae | repne scasb al, byte ptr es:[edi] // a1???????? | // 68???????? | // f7d1 | not ecx $sequence_4 = { 8b8c2454010000 6a00 8d442428 6800010000 50 } // n = 5, score = 100 // 8b8c2454010000 | mov ecx, dword ptr [esp + 0x154] // 6a00 | push 0 // 8d442428 | lea eax, [esp + 0x28] // 6800010000 | push 0x100 // 50 | push eax $sequence_5 = { 6aff 50 ff15???????? 85c0 6a00 } // n = 5, score = 100 // 6aff | push -1 // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 6a00 | push 0 $sequence_6 = { 8bf7 c1e902 8bfa 8d942488010000 f3a5 } // n = 5, score = 100 // 8bf7 | mov esi, edi // c1e902 | shr ecx, 2 // 8bfa | mov edi, edx // 8d942488010000 | lea edx, [esp + 0x188] // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] $sequence_7 = { 7ced 55 8bac2418020000 6a00 8d442414 6804020000 50 } // n = 7, score = 100 // 7ced | jl 0xffffffef // 55 | push ebp // 8bac2418020000 | mov ebp, dword ptr [esp + 0x218] // 6a00 | push 0 // 8d442414 | lea eax, [esp + 0x14] // 6804020000 | push 0x204 // 50 | push eax $sequence_8 = { 8dbc2419020000 c684241802000000 f3ab 66ab 6a00 } // n = 5, score = 100 // 8dbc2419020000 | lea edi, [esp + 0x219] // c684241802000000 | mov byte ptr [esp + 0x218], 0 // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // 6a00 | push 0 $sequence_9 = { c1e902 83e203 83f908 7229 f3a5 ff2495c8350010 8bc7 } // n = 7, score = 100 // c1e902 | shr ecx, 2 // 83e203 | and edx, 3 // 83f908 | cmp ecx, 8 // 7229 | jb 0x2b // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // ff2495c8350010 | jmp dword ptr [edx*4 + 0x100035c8] // 8bc7 | mov eax, edi condition: 7 of them and filesize < 139264 }
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