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rule win_seasalt_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "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 = { e8???????? 8d542430 68e8010000 8d842434020000 } // n = 4, score = 100 // e8???????? | // 8d542430 | lea edx, [esp + 0x30] // 68e8010000 | push 0x1e8 // 8d842434020000 | lea eax, [esp + 0x234] $sequence_1 = { 8bf8 85ff 745d 6a00 56 } // n = 5, score = 100 // 8bf8 | mov edi, eax // 85ff | test edi, edi // 745d | je 0x5f // 6a00 | push 0 // 56 | push esi $sequence_2 = { ff15???????? 85c0 7f85 899c2478100000 } // n = 4, score = 100 // ff15???????? | // 85c0 | test eax, eax // 7f85 | jg 0xffffff87 // 899c2478100000 | mov dword ptr [esp + 0x1078], ebx $sequence_3 = { 85c0 75bb 8b442414 8d942420010000 52 } // n = 5, score = 100 // 85c0 | test eax, eax // 75bb | jne 0xffffffbd // 8b442414 | mov eax, dword ptr [esp + 0x14] // 8d942420010000 | lea edx, [esp + 0x120] // 52 | push edx $sequence_4 = { 0f8557030000 c745fc00000000 8b35???????? 68???????? ffd6 85c0 } // n = 6, score = 100 // 0f8557030000 | jne 0x35d // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 8b35???????? | // 68???????? | // ffd6 | call esi // 85c0 | test eax, eax $sequence_5 = { 6a00 51 ff15???????? 83f81f 6a00 } // n = 5, score = 100 // 6a00 | push 0 // 51 | push ecx // ff15???????? | // 83f81f | cmp eax, 0x1f // 6a00 | push 0 $sequence_6 = { 49 8d84248c010000 51 50 } // n = 4, score = 100 // 49 | dec ecx // 8d84248c010000 | lea eax, [esp + 0x18c] // 51 | push ecx // 50 | push eax $sequence_7 = { 50 53 ffd5 8d4c2412 51 e8???????? } // n = 6, score = 100 // 50 | push eax // 53 | push ebx // ffd5 | call ebp // 8d4c2412 | lea ecx, [esp + 0x12] // 51 | push ecx // e8???????? | $sequence_8 = { 5e 83c420 c3 53 8b1d???????? 8d4c2410 } // n = 6, score = 100 // 5e | pop esi // 83c420 | add esp, 0x20 // c3 | ret // 53 | push ebx // 8b1d???????? | // 8d4c2410 | lea ecx, [esp + 0x10] $sequence_9 = { 83e01f 8b0c8d40db0010 8d04c0 8d0481 eb05 } // n = 5, score = 100 // 83e01f | and eax, 0x1f // 8b0c8d40db0010 | mov ecx, dword ptr [ecx*4 + 0x1000db40] // 8d04c0 | lea eax, [eax + eax*8] // 8d0481 | lea eax, [ecx + eax*4] // eb05 | jmp 7 condition: 7 of them and filesize < 139264 }
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