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rule win_satana_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.satana" 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 = { 83c40c 660fd645f0 660fefc0 68???????? 884df8 660fd645c0 660fd645c8 } // n = 7, score = 100 // 83c40c | add esp, 0xc // 660fd645f0 | movq qword ptr [ebp - 0x10], xmm0 // 660fefc0 | pxor xmm0, xmm0 // 68???????? | // 884df8 | mov byte ptr [ebp - 8], cl // 660fd645c0 | movq qword ptr [ebp - 0x40], xmm0 // 660fd645c8 | movq qword ptr [ebp - 0x38], xmm0 $sequence_1 = { 83e10f 0fb64c0de8 8848fe 0fb64c35ad } // n = 4, score = 100 // 83e10f | and ecx, 0xf // 0fb64c0de8 | movzx ecx, byte ptr [ebp + ecx - 0x18] // 8848fe | mov byte ptr [eax - 2], cl // 0fb64c35ad | movzx ecx, byte ptr [ebp + esi - 0x53] $sequence_2 = { 8d8530ffffff 6a00 50 e8???????? 6a74 8d8d78ffffff 6a00 } // n = 7, score = 100 // 8d8530ffffff | lea eax, [ebp - 0xd0] // 6a00 | push 0 // 50 | push eax // e8???????? | // 6a74 | push 0x74 // 8d8d78ffffff | lea ecx, [ebp - 0x88] // 6a00 | push 0 $sequence_3 = { 5f 80895df000895d fc 895df8 } // n = 4, score = 100 // 5f | pop edi // 80895df000895d | or byte ptr [ecx - 0x76ff0fa3], 0x5d // fc | cld // 895df8 | mov dword ptr [ebp - 8], ebx $sequence_4 = { 750f 47 8984bd6cffffff 83ff0f 7330 eb15 6a44 } // n = 7, score = 100 // 750f | jne 0x11 // 47 | inc edi // 8984bd6cffffff | mov dword ptr [ebp + edi*4 - 0x94], eax // 83ff0f | cmp edi, 0xf // 7330 | jae 0x32 // eb15 | jmp 0x17 // 6a44 | push 0x44 $sequence_5 = { c645fd00 84db 7426 0fb6d3 0fb682581e4100 0fb615???????? 03c2 } // n = 7, score = 100 // c645fd00 | mov byte ptr [ebp - 3], 0 // 84db | test bl, bl // 7426 | je 0x28 // 0fb6d3 | movzx edx, bl // 0fb682581e4100 | movzx eax, byte ptr [edx + 0x411e58] // 0fb615???????? | // 03c2 | add eax, edx $sequence_6 = { 8d45dc 50 57 ff15???????? 8b75dc 8975bc } // n = 6, score = 100 // 8d45dc | lea eax, [ebp - 0x24] // 50 | push eax // 57 | push edi // ff15???????? | // 8b75dc | mov esi, dword ptr [ebp - 0x24] // 8975bc | mov dword ptr [ebp - 0x44], esi $sequence_7 = { 6a04 8d44240c 50 6a07 ff15???????? } // n = 5, score = 100 // 6a04 | push 4 // 8d44240c | lea eax, [esp + 0xc] // 50 | push eax // 6a07 | push 7 // ff15???????? | $sequence_8 = { ffd6 8b4dec 8b15???????? 51 6a08 52 } // n = 6, score = 100 // ffd6 | call esi // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 8b15???????? | // 51 | push ecx // 6a08 | push 8 // 52 | push edx $sequence_9 = { 6a00 50 c745c43c000000 e8???????? 83c40c } // n = 5, score = 100 // 6a00 | push 0 // 50 | push eax // c745c43c000000 | mov dword ptr [ebp - 0x3c], 0x3c // e8???????? | // 83c40c | add esp, 0xc condition: 7 of them and filesize < 221184 }
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