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rule win_seasalt_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 7515 8d4dd0 68???????? 51 } // n = 4, score = 100 // 7515 | jne 0x17 // 8d4dd0 | lea ecx, [ebp - 0x30] // 68???????? | // 51 | push ecx $sequence_1 = { 8b15???????? 6a00 8d8c2474010000 6804020000 51 52 ff15???????? } // n = 7, score = 100 // 8b15???????? | // 6a00 | push 0 // 8d8c2474010000 | lea ecx, [esp + 0x174] // 6804020000 | push 0x204 // 51 | push ecx // 52 | push edx // ff15???????? | $sequence_2 = { 7765 ff2485f4130010 8b0d???????? 68???????? 51 } // n = 5, score = 100 // 7765 | ja 0x67 // ff2485f4130010 | jmp dword ptr [eax*4 + 0x100013f4] // 8b0d???????? | // 68???????? | // 51 | push ecx $sequence_3 = { 6a07 8d55e8 51 52 e8???????? 83c40c 85c0 } // n = 7, score = 100 // 6a07 | push 7 // 8d55e8 | lea edx, [ebp - 0x18] // 51 | push ecx // 52 | push edx // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax $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 = { 6a00 6804020000 50 56 ff15???????? 33c0 } // n = 6, score = 100 // 6a00 | push 0 // 6804020000 | push 0x204 // 50 | push eax // 56 | push esi // ff15???????? | // 33c0 | xor eax, eax $sequence_7 = { 0fb601 0fb6fa 3bc7 7714 8b55fc 8a92c0cc0010 } // n = 6, score = 100 // 0fb601 | movzx eax, byte ptr [ecx] // 0fb6fa | movzx edi, dl // 3bc7 | cmp eax, edi // 7714 | ja 0x16 // 8b55fc | mov edx, dword ptr [ebp - 4] // 8a92c0cc0010 | mov dl, byte ptr [edx + 0x1000ccc0] $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 = { 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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