Actor(s): Mofang
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rule win_shimrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.shimrat." 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.shimrat" 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 = { 0f849e030000 48 0f840b030000 48 0f85a3030000 } // n = 5, score = 100 // 0f849e030000 | je 0x3a4 // 48 | dec eax // 0f840b030000 | je 0x311 // 48 | dec eax // 0f85a3030000 | jne 0x3a9 $sequence_1 = { e8???????? 8d4648 ebb9 33c0 5e 5d c21000 } // n = 7, score = 100 // e8???????? | // 8d4648 | lea eax, [esi + 0x48] // ebb9 | jmp 0xffffffbb // 33c0 | xor eax, eax // 5e | pop esi // 5d | pop ebp // c21000 | ret 0x10 $sequence_2 = { 50 8bce e8???????? 50 8d4d74 e8???????? 8d4d20 } // n = 7, score = 100 // 50 | push eax // 8bce | mov ecx, esi // e8???????? | // 50 | push eax // 8d4d74 | lea ecx, [ebp + 0x74] // e8???????? | // 8d4d20 | lea ecx, [ebp + 0x20] $sequence_3 = { eb07 c7461403000000 837e1403 6a04 5b 7513 8bce } // n = 7, score = 100 // eb07 | jmp 9 // c7461403000000 | mov dword ptr [esi + 0x14], 3 // 837e1403 | cmp dword ptr [esi + 0x14], 3 // 6a04 | push 4 // 5b | pop ebx // 7513 | jne 0x15 // 8bce | mov ecx, esi $sequence_4 = { 85c0 751e 8d4570 50 6a01 } // n = 5, score = 100 // 85c0 | test eax, eax // 751e | jne 0x20 // 8d4570 | lea eax, [ebp + 0x70] // 50 | push eax // 6a01 | push 1 $sequence_5 = { 8d4f60 e8???????? 660fbe06 0fb7c0 8945fc 0fb7c0 50 } // n = 7, score = 100 // 8d4f60 | lea ecx, [edi + 0x60] // e8???????? | // 660fbe06 | movsx ax, byte ptr [esi] // 0fb7c0 | movzx eax, ax // 8945fc | mov dword ptr [ebp - 4], eax // 0fb7c0 | movzx eax, ax // 50 | push eax $sequence_6 = { 83f8ff 0f845c020000 81c690000000 8bce e8???????? 50 } // n = 6, score = 100 // 83f8ff | cmp eax, -1 // 0f845c020000 | je 0x262 // 81c690000000 | add esi, 0x90 // 8bce | mov ecx, esi // e8???????? | // 50 | push eax $sequence_7 = { 50 8d4704 50 ff75f8 } // n = 4, score = 100 // 50 | push eax // 8d4704 | lea eax, [edi + 4] // 50 | push eax // ff75f8 | push dword ptr [ebp - 8] $sequence_8 = { 8d4df0 e8???????? 8bce e8???????? e9???????? } // n = 5, score = 100 // 8d4df0 | lea ecx, [ebp - 0x10] // e8???????? | // 8bce | mov ecx, esi // e8???????? | // e9???????? | $sequence_9 = { e8???????? 8b4d0c 33f6 56 56 6aff } // n = 6, score = 100 // e8???????? | // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 33f6 | xor esi, esi // 56 | push esi // 56 | push esi // 6aff | push -1 condition: 7 of them and filesize < 65536 }
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