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rule win_farseer_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.farseer" 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 = { 83c404 8b8c2458040000 64890d00000000 59 5f 5e 5d } // n = 7, score = 100 // 83c404 | add esp, 4 // 8b8c2458040000 | mov ecx, dword ptr [esp + 0x458] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5f | pop edi // 5e | pop esi // 5d | pop ebp $sequence_1 = { 75f6 8b3d???????? 33d2 668954246c 33db be41000000 } // n = 6, score = 100 // 75f6 | jne 0xfffffff8 // 8b3d???????? | // 33d2 | xor edx, edx // 668954246c | mov word ptr [esp + 0x6c], dx // 33db | xor ebx, ebx // be41000000 | mov esi, 0x41 $sequence_2 = { e9???????? 8d8d9cfeffff e9???????? 8b542408 8d8298feffff } // n = 5, score = 100 // e9???????? | // 8d8d9cfeffff | lea ecx, [ebp - 0x164] // e9???????? | // 8b542408 | mov edx, dword ptr [esp + 8] // 8d8298feffff | lea eax, [edx - 0x168] $sequence_3 = { 83c420 0174241c 83d000 89442420 39442428 } // n = 5, score = 100 // 83c420 | add esp, 0x20 // 0174241c | add dword ptr [esp + 0x1c], esi // 83d000 | adc eax, 0 // 89442420 | mov dword ptr [esp + 0x20], eax // 39442428 | cmp dword ptr [esp + 0x28], eax $sequence_4 = { 83fe10 7304 8d4c2434 8bd5 8a01 8802 } // n = 6, score = 100 // 83fe10 | cmp esi, 0x10 // 7304 | jae 6 // 8d4c2434 | lea ecx, [esp + 0x34] // 8bd5 | mov edx, ebp // 8a01 | mov al, byte ptr [ecx] // 8802 | mov byte ptr [edx], al $sequence_5 = { 8d042f 50 53 ff15???????? 85c0 7e6c } // n = 6, score = 100 // 8d042f | lea eax, [edi + ebp] // 50 | push eax // 53 | push ebx // ff15???????? | // 85c0 | test eax, eax // 7e6c | jle 0x6e $sequence_6 = { 8d0c3e 51 53 ffd5 85c0 7e2f 03f0 } // n = 7, score = 100 // 8d0c3e | lea ecx, [esi + edi] // 51 | push ecx // 53 | push ebx // ffd5 | call ebp // 85c0 | test eax, eax // 7e2f | jle 0x31 // 03f0 | add esi, eax $sequence_7 = { ff15???????? 6804010000 8d54245a b901000000 52 } // n = 5, score = 100 // ff15???????? | // 6804010000 | push 0x104 // 8d54245a | lea edx, [esp + 0x5a] // b901000000 | mov ecx, 1 // 52 | push edx $sequence_8 = { 50 eb5a 3bf8 7609 } // n = 4, score = 100 // 50 | push eax // eb5a | jmp 0x5c // 3bf8 | cmp edi, eax // 7609 | jbe 0xb $sequence_9 = { 8bfa 33ed 895c2434 897c2454 896c242c 89ac2484000000 8bb424a0000000 } // n = 7, score = 100 // 8bfa | mov edi, edx // 33ed | xor ebp, ebp // 895c2434 | mov dword ptr [esp + 0x34], ebx // 897c2454 | mov dword ptr [esp + 0x54], edi // 896c242c | mov dword ptr [esp + 0x2c], ebp // 89ac2484000000 | mov dword ptr [esp + 0x84], ebp // 8bb424a0000000 | mov esi, dword ptr [esp + 0xa0] condition: 7 of them and filesize < 347328 }
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