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rule win_tofsee_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.tofsee" 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 = { 57 e8???????? 8d85f0f7ffff 50 6800040000 ff15???????? } // n = 6, score = 400 // 57 | push edi // e8???????? | // 8d85f0f7ffff | lea eax, [ebp - 0x810] // 50 | push eax // 6800040000 | push 0x400 // ff15???????? | $sequence_1 = { e8???????? 80782451 0f84cf040000 57 8bcb } // n = 5, score = 400 // e8???????? | // 80782451 | cmp byte ptr [eax + 0x24], 0x51 // 0f84cf040000 | je 0x4d5 // 57 | push edi // 8bcb | mov ecx, ebx $sequence_2 = { 80f95a 7f16 80f961 7c06 8b5208 8002e0 8b4e24 } // n = 7, score = 400 // 80f95a | cmp cl, 0x5a // 7f16 | jg 0x18 // 80f961 | cmp cl, 0x61 // 7c06 | jl 8 // 8b5208 | mov edx, dword ptr [edx + 8] // 8002e0 | add byte ptr [edx], 0xe0 // 8b4e24 | mov ecx, dword ptr [esi + 0x24] $sequence_3 = { 53 e8???????? 83c40c 6683631000 8d4f30 6a12 5e } // n = 7, score = 400 // 53 | push ebx // e8???????? | // 83c40c | add esp, 0xc // 6683631000 | and word ptr [ebx + 0x10], 0 // 8d4f30 | lea ecx, [edi + 0x30] // 6a12 | push 0x12 // 5e | pop esi $sequence_4 = { 6a40 8d4580 50 ff75fc 8975ec 8975e8 } // n = 6, score = 400 // 6a40 | push 0x40 // 8d4580 | lea eax, [ebp - 0x80] // 50 | push eax // ff75fc | push dword ptr [ebp - 4] // 8975ec | mov dword ptr [ebp - 0x14], esi // 8975e8 | mov dword ptr [ebp - 0x18], esi $sequence_5 = { 8945ec ff15???????? 3bc7 8945f4 7507 33c0 5f } // n = 7, score = 400 // 8945ec | mov dword ptr [ebp - 0x14], eax // ff15???????? | // 3bc7 | cmp eax, edi // 8945f4 | mov dword ptr [ebp - 0xc], eax // 7507 | jne 9 // 33c0 | xor eax, eax // 5f | pop edi $sequence_6 = { 3bf7 8945f8 897dfc 7507 33c0 e9???????? 6a10 } // n = 7, score = 400 // 3bf7 | cmp esi, edi // 8945f8 | mov dword ptr [ebp - 8], eax // 897dfc | mov dword ptr [ebp - 4], edi // 7507 | jne 9 // 33c0 | xor eax, eax // e9???????? | // 6a10 | push 0x10 $sequence_7 = { 8d45e8 57 50 e8???????? 83c40c ff750c ff15???????? } // n = 7, score = 400 // 8d45e8 | lea eax, [ebp - 0x18] // 57 | push edi // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // ff750c | push dword ptr [ebp + 0xc] // ff15???????? | $sequence_8 = { 57 8b7d08 8d5f04 68???????? } // n = 4, score = 400 // 57 | push edi // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8d5f04 | lea ebx, [edi + 4] // 68???????? | $sequence_9 = { 57 ff75ec 897df0 ff75e8 e8???????? 83c40c } // n = 6, score = 400 // 57 | push edi // ff75ec | push dword ptr [ebp - 0x14] // 897df0 | mov dword ptr [ebp - 0x10], edi // ff75e8 | push dword ptr [ebp - 0x18] // e8???????? | // 83c40c | add esp, 0xc condition: 7 of them and filesize < 147456 }
rule win_tofsee_w0 { meta: author="akrasuski1" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.tofsee" malpedia_version = "20171121" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $decryptStr = {32 55 14 88 10 8A D1 02 55 18 F6 D9 00 55 14} $xorGreet = {C1 EB 03 C0 E1 05 0A D9 32 DA 34 C6 88 1E} $xorCrypt = {F7 FB 8A 44 0A 04 30 06 FF 41 0C} $string_res1 = "loader_id" $string_res2 = "born_date" $string_res3 = "work_srv" $string_res4 = "flags_upd" $string_res5 = "lid_file_upd" $string_res6 = "localcfg" $string_var0 = "%RND_NUM" $string_var1 = "%SYS_JR" $string_var2 = "%SYS_N" $string_var3 = "%SYS_RN" $string_var4 = "%RND_SPACE" $string_var5 = "%RND_DIGIT" $string_var6 = "%RND_HEX" $string_var7 = "%RND_hex" $string_var8 = "%RND_char" $string_var9 = "%RND_CHAR" condition: (7 of ($string_var*) and 4 of ($string_res*)) or (7 of ($string_var*) and 2 of ($decryptStr, $xorGreet, $xorCrypt)) or (4 of ($string_res*) and 2 of ($decryptStr, $xorGreet, $xorCrypt)) }
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