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rule win_sword_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.sword" 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 = { 7578 8d942484020000 6a5c 52 } // n = 4, score = 100 // 7578 | jne 0x7a // 8d942484020000 | lea edx, [esp + 0x284] // 6a5c | push 0x5c // 52 | push edx $sequence_1 = { 8dbc2478010000 83c9ff 33c0 83c408 f2ae 8b8424d80f0000 } // n = 6, score = 100 // 8dbc2478010000 | lea edi, [esp + 0x178] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // 83c408 | add esp, 8 // f2ae | repne scasb al, byte ptr es:[edi] // 8b8424d80f0000 | mov eax, dword ptr [esp + 0xfd8] $sequence_2 = { 50 8d54241c 51 52 ff15???????? 85c0 0f8488090000 } // n = 7, score = 100 // 50 | push eax // 8d54241c | lea edx, [esp + 0x1c] // 51 | push ecx // 52 | push edx // ff15???????? | // 85c0 | test eax, eax // 0f8488090000 | je 0x98e $sequence_3 = { 8d842470010000 68???????? 50 e8???????? 8dbc2478010000 83c9ff 33c0 } // n = 7, score = 100 // 8d842470010000 | lea eax, [esp + 0x170] // 68???????? | // 50 | push eax // e8???????? | // 8dbc2478010000 | lea edi, [esp + 0x178] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax $sequence_4 = { 6a10 51 56 ffd3 83f8ff 750a } // n = 6, score = 100 // 6a10 | push 0x10 // 51 | push ecx // 56 | push esi // ffd3 | call ebx // 83f8ff | cmp eax, -1 // 750a | jne 0xc $sequence_5 = { 77c8 bf???????? 83c9ff 33c0 f2ae f7d1 } // n = 6, score = 100 // 77c8 | ja 0xffffffca // bf???????? | // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx $sequence_6 = { 0bc9 0f8495000000 8b7508 8b7d0c 8d05a49e4000 83780800 7543 } // n = 7, score = 100 // 0bc9 | or ecx, ecx // 0f8495000000 | je 0x9b // 8b7508 | mov esi, dword ptr [ebp + 8] // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 8d05a49e4000 | lea eax, [0x409ea4] // 83780800 | cmp dword ptr [eax + 8], 0 // 7543 | jne 0x45 $sequence_7 = { 668b11 f6c201 7416 8088????????10 8a9405ecfdffff 8890e09e4000 } // n = 6, score = 100 // 668b11 | mov dx, word ptr [ecx] // f6c201 | test dl, 1 // 7416 | je 0x18 // 8088????????10 | // 8a9405ecfdffff | mov dl, byte ptr [ebp + eax - 0x214] // 8890e09e4000 | mov byte ptr [eax + 0x409ee0], dl $sequence_8 = { 8d842470010000 50 ff15???????? 50 e8???????? } // n = 5, score = 100 // 8d842470010000 | lea eax, [esp + 0x170] // 50 | push eax // ff15???????? | // 50 | push eax // e8???????? | $sequence_9 = { f7d1 49 83f903 77c8 bf???????? } // n = 5, score = 100 // f7d1 | not ecx // 49 | dec ecx // 83f903 | cmp ecx, 3 // 77c8 | ja 0xffffffca // bf???????? | condition: 7 of them and filesize < 106496 }
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