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rule win_seasalt_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 85c0 75a2 e9???????? ffd3 83f812 } // n = 5, score = 100 // 85c0 | test eax, eax // 75a2 | jne 0xffffffa4 // e9???????? | // ffd3 | call ebx // 83f812 | cmp eax, 0x12 $sequence_1 = { 83f80c 77b8 ff2485b01c0010 8b15???????? 52 e8???????? } // n = 6, score = 100 // 83f80c | cmp eax, 0xc // 77b8 | ja 0xffffffba // ff2485b01c0010 | jmp dword ptr [eax*4 + 0x10001cb0] // 8b15???????? | // 52 | push edx // e8???????? | $sequence_2 = { 57 8965f0 e8???????? b909000000 be???????? 8dbd78feffff 33c0 } // n = 7, score = 100 // 57 | push edi // 8965f0 | mov dword ptr [ebp - 0x10], esp // e8???????? | // b909000000 | mov ecx, 9 // be???????? | // 8dbd78feffff | lea edi, [ebp - 0x188] // 33c0 | xor eax, eax $sequence_3 = { 8bc6 c1f805 8d1c8540db0010 8bc6 83e01f 8d34c0 } // n = 6, score = 100 // 8bc6 | mov eax, esi // c1f805 | sar eax, 5 // 8d1c8540db0010 | lea ebx, [eax*4 + 0x1000db40] // 8bc6 | mov eax, esi // 83e01f | and eax, 0x1f // 8d34c0 | lea esi, [eax + eax*8] $sequence_4 = { 8b0cf504c90010 5e 8908 c3 81f9bc000000 } // n = 5, score = 100 // 8b0cf504c90010 | mov ecx, dword ptr [esi*8 + 0x1000c904] // 5e | pop esi // 8908 | mov dword ptr [eax], ecx // c3 | ret // 81f9bc000000 | cmp ecx, 0xbc $sequence_5 = { eba0 8b0d???????? 8d85e0feffff 50 } // n = 4, score = 100 // eba0 | jmp 0xffffffa2 // 8b0d???????? | // 8d85e0feffff | lea eax, [ebp - 0x120] // 50 | push eax $sequence_6 = { a1???????? 53 53 68???????? 8d942484000000 6800020000 } // n = 6, score = 100 // a1???????? | // 53 | push ebx // 53 | push ebx // 68???????? | // 8d942484000000 | lea edx, [esp + 0x84] // 6800020000 | push 0x200 $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 = { 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 = { 68???????? 51 8975e0 8975e8 8975dc 8975fc } // n = 6, 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 // 8975fc | mov dword ptr [ebp - 4], esi condition: 7 of them and filesize < 139264 }
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