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rule win_seasalt_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 68???????? 50 c745e4f4010000 ff15???????? 3bc6 } // n = 5, score = 100 // 68???????? | // 50 | push eax // c745e4f4010000 | mov dword ptr [ebp - 0x1c], 0x1f4 // ff15???????? | // 3bc6 | cmp eax, esi $sequence_1 = { ff2485d0650010 834df0ff 8955cc 8955d8 8955e0 } // n = 5, score = 100 // ff2485d0650010 | jmp dword ptr [eax*4 + 0x100065d0] // 834df0ff | or dword ptr [ebp - 0x10], 0xffffffff // 8955cc | mov dword ptr [ebp - 0x34], edx // 8955d8 | mov dword ptr [ebp - 0x28], edx // 8955e0 | mov dword ptr [ebp - 0x20], edx $sequence_2 = { 68???????? 51 8975e0 8975e8 8975dc } // n = 5, score = 100 // 68???????? | // 51 | push ecx // 8975e0 | mov dword ptr [ebp - 0x20], esi // 8975e8 | mov dword ptr [ebp - 0x18], esi // 8975dc | mov dword ptr [ebp - 0x24], esi $sequence_3 = { 52 e8???????? 83c404 eba0 8b0d???????? 8d85e0feffff } // n = 6, score = 100 // 52 | push edx // e8???????? | // 83c404 | add esp, 4 // eba0 | jmp 0xffffffa2 // 8b0d???????? | // 8d85e0feffff | lea eax, [ebp - 0x120] $sequence_4 = { a3???????? 8b442408 48 7509 8b442404 a3???????? } // n = 6, score = 100 // a3???????? | // 8b442408 | mov eax, dword ptr [esp + 8] // 48 | dec eax // 7509 | jne 0xb // 8b442404 | mov eax, dword ptr [esp + 4] // a3???????? | $sequence_5 = { 40 3d00010000 7ced 6a00 8d54241c 6808010000 } // n = 6, score = 100 // 40 | inc eax // 3d00010000 | cmp eax, 0x100 // 7ced | jl 0xffffffef // 6a00 | push 0 // 8d54241c | lea edx, [esp + 0x1c] // 6808010000 | push 0x108 $sequence_6 = { 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_7 = { 68???????? 50 ff15???????? 8dbdd8fdffff 83c9ff } // n = 5, score = 100 // 68???????? | // 50 | push eax // ff15???????? | // 8dbdd8fdffff | lea edi, [ebp - 0x228] // 83c9ff | or ecx, 0xffffffff $sequence_8 = { 6800010000 56 50 ff15???????? b980000000 33c0 } // n = 6, score = 100 // 6800010000 | push 0x100 // 56 | push esi // 50 | push eax // ff15???????? | // b980000000 | mov ecx, 0x80 // 33c0 | xor eax, eax $sequence_9 = { 6a00 6a02 68???????? 52 ffd5 } // n = 5, score = 100 // 6a00 | push 0 // 6a02 | push 2 // 68???????? | // 52 | push edx // ffd5 | call ebp condition: 7 of them and filesize < 139264 }
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