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rule win_oceansalt_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.oceansalt" 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 = { c785ccfdffff28010000 e8???????? 8d8dccfdffff 51 50 } // n = 5, score = 300 // c785ccfdffff28010000 | mov dword ptr [ebp - 0x234], 0x128 // e8???????? | // 8d8dccfdffff | lea ecx, [ebp - 0x234] // 51 | push ecx // 50 | push eax $sequence_1 = { 6808010000 8d95f4feffff 52 56 c745f800000000 ffd7 8b4dfc } // n = 7, score = 300 // 6808010000 | push 0x108 // 8d95f4feffff | lea edx, [ebp - 0x10c] // 52 | push edx // 56 | push esi // c745f800000000 | mov dword ptr [ebp - 8], 0 // ffd7 | call edi // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_2 = { 8d8dc8fdffff 51 56 ffd3 8d95c8fdffff } // n = 5, score = 300 // 8d8dc8fdffff | lea ecx, [ebp - 0x238] // 51 | push ecx // 56 | push esi // ffd3 | call ebx // 8d95c8fdffff | lea edx, [ebp - 0x238] $sequence_3 = { 56 8b7508 57 6a00 6804020000 } // n = 5, score = 300 // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 57 | push edi // 6a00 | push 0 // 6804020000 | push 0x204 $sequence_4 = { 6804020000 8d85f8fdffff 50 51 ff15???????? } // n = 5, score = 300 // 6804020000 | push 0x204 // 8d85f8fdffff | lea eax, [ebp - 0x208] // 50 | push eax // 51 | push ecx // ff15???????? | $sequence_5 = { 84c9 75ed 8b95d4fdffff 8955f4 } // n = 4, score = 300 // 84c9 | test cl, cl // 75ed | jne 0xffffffef // 8b95d4fdffff | mov edx, dword ptr [ebp - 0x22c] // 8955f4 | mov dword ptr [ebp - 0xc], edx $sequence_6 = { 68???????? 6a00 ff15???????? 33c0 8b4dfc } // n = 5, score = 300 // 68???????? | // 6a00 | push 0 // ff15???????? | // 33c0 | xor eax, eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_7 = { ff15???????? 57 ff15???????? 8b3d???????? 53 } // n = 5, score = 300 // ff15???????? | // 57 | push edi // ff15???????? | // 8b3d???????? | // 53 | push ebx $sequence_8 = { 66660f1f840000000000 8bce 8bc5 d3e8 85c0 } // n = 5, score = 100 // 66660f1f840000000000 | inc esi // 8bce | cmp esi, 0x1a // 8bc5 | jl 0xffffff6b // d3e8 | xor eax, eax // 85c0 | nop word ptr [eax + eax] $sequence_9 = { 488d4158 41b806000000 488d15f3830000 483950f0 740c } // n = 5, score = 100 // 488d4158 | mov eax, dword ptr [esp + 0x50] // 41b806000000 | dec eax // 488d15f3830000 | and dword ptr [esp + 0x20], 0 // 483950f0 | inc eax // 740c | mov byte ptr [esp + 0x5c], ch $sequence_10 = { 4833cc e8???????? 4c8d9c2470060000 498b6b20 498b7328 498be3 } // n = 6, score = 100 // 4833cc | lea eax, [ecx + 0x58] // e8???????? | // 4c8d9c2470060000 | inc ecx // 498b6b20 | mov eax, 6 // 498b7328 | dec eax // 498be3 | lea edx, [0x83f3] $sequence_11 = { 88440ffe 84c0 75f1 ffc6 83fe1a 0f8c65ffffff 33c0 } // n = 7, score = 100 // 88440ffe | inc ebp // 84c0 | lea eax, [ecx + 2] // 75f1 | dec eax // ffc6 | lea esi, [esp + 0x30] // 83fe1a | mov byte ptr [edi + ecx - 2], al // 0f8c65ffffff | test al, al // 33c0 | jne 0xfffffff5 $sequence_12 = { 488bce 488bd3 e8???????? 488bd7 660f1f840000000000 0fb6041a } // n = 6, score = 100 // 488bce | dec eax // 488bd3 | lea ecx, [0xff94] // e8???????? | // 488bd7 | dec esp // 660f1f840000000000 | lea ecx, [esp + 0x4c] // 0fb6041a | dec eax $sequence_13 = { 488b442450 488364242000 40886c245c 488d0d94ff0000 4c8d4c244c } // n = 5, score = 100 // 488b442450 | mov ecx, esi // 488364242000 | mov eax, ebp // 40886c245c | shr eax, cl // 488d0d94ff0000 | test eax, eax // 4c8d4c244c | dec eax $sequence_14 = { 488d542430 488bcb 458d4102 ff15???????? 488d742430 } // n = 5, score = 100 // 488d542430 | dec eax // 488bcb | lea edx, [esp + 0x30] // 458d4102 | dec eax // ff15???????? | // 488d742430 | mov ecx, ebx $sequence_15 = { 420fbe940ac0e60000 c1fa04 8954245c 8bca 413bd2 } // n = 5, score = 100 // 420fbe940ac0e60000 | dec eax // c1fa04 | cmp dword ptr [eax - 0x10], edx // 8954245c | je 0x19 // 8bca | dec eax // 413bd2 | mov ecx, esi condition: 7 of them and filesize < 212992 }
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