Actor(s): DragonOK
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rule win_new_ct_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.new_ct" 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 = { 51 ffd7 8b542428 52 ffd7 8b8580030000 50 } // n = 7, score = 200 // 51 | push ecx // ffd7 | call edi // 8b542428 | mov edx, dword ptr [esp + 0x28] // 52 | push edx // ffd7 | call edi // 8b8580030000 | mov eax, dword ptr [ebp + 0x380] // 50 | push eax $sequence_1 = { c1e902 f3a5 8bc8 83e103 f3a4 8b4c2414 8d7c1104 } // n = 7, score = 200 // c1e902 | shr ecx, 2 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bc8 | mov ecx, eax // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 8d7c1104 | lea edi, [ecx + edx + 4] $sequence_2 = { 53 52 e8???????? 8dbc2480020000 83c9ff 33c0 83c440 } // n = 7, score = 200 // 53 | push ebx // 52 | push edx // e8???????? | // 8dbc2480020000 | lea edi, [esp + 0x280] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // 83c440 | add esp, 0x40 $sequence_3 = { 85c0 0f846b020000 68???????? 8d85e4feffff 50 ff15???????? } // n = 6, score = 200 // 85c0 | test eax, eax // 0f846b020000 | je 0x271 // 68???????? | // 8d85e4feffff | lea eax, [ebp - 0x11c] // 50 | push eax // ff15???????? | $sequence_4 = { ff15???????? 50 ff15???????? 68e8030000 ff15???????? 8bc7 5f } // n = 7, score = 200 // ff15???????? | // 50 | push eax // ff15???????? | // 68e8030000 | push 0x3e8 // ff15???????? | // 8bc7 | mov eax, edi // 5f | pop edi $sequence_5 = { 83c40c f2ae f7d1 49 8d7c2478 } // n = 5, score = 200 // 83c40c | add esp, 0xc // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 49 | dec ecx // 8d7c2478 | lea edi, [esp + 0x78] $sequence_6 = { 740d 8d942414020000 52 ffd0 83c404 5f 5e } // n = 7, score = 200 // 740d | je 0xf // 8d942414020000 | lea edx, [esp + 0x214] // 52 | push edx // ffd0 | call eax // 83c404 | add esp, 4 // 5f | pop edi // 5e | pop esi $sequence_7 = { 8995d4feffff 8b8584faffff 8985ccfeffff 8b4510 890c03 83c304 } // n = 6, score = 200 // 8995d4feffff | mov dword ptr [ebp - 0x12c], edx // 8b8584faffff | mov eax, dword ptr [ebp - 0x57c] // 8985ccfeffff | mov dword ptr [ebp - 0x134], eax // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 890c03 | mov dword ptr [ebx + eax], ecx // 83c304 | add ebx, 4 $sequence_8 = { 5b 81c4680f0000 c21400 8b8e80030000 33d2 bb19000000 8b39 } // n = 7, score = 200 // 5b | pop ebx // 81c4680f0000 | add esp, 0xf68 // c21400 | ret 0x14 // 8b8e80030000 | mov ecx, dword ptr [esi + 0x380] // 33d2 | xor edx, edx // bb19000000 | mov ebx, 0x19 // 8b39 | mov edi, dword ptr [ecx] $sequence_9 = { 8d7c240d 8844240c 33c0 f3ab 8d8c24a4000000 51 } // n = 6, score = 200 // 8d7c240d | lea edi, [esp + 0xd] // 8844240c | mov byte ptr [esp + 0xc], al // 33c0 | xor eax, eax // f3ab | rep stosd dword ptr es:[edi], eax // 8d8c24a4000000 | lea ecx, [esp + 0xa4] // 51 | push ecx condition: 7 of them and filesize < 122880 }
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