Actor(s): MUSTANG PANDA
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rule win_mqsttang_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.mqsttang." info = "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.mqsttang" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { e8???????? 8d4c2430 668944245e e8???????? ba93244992 89c1 c7042400000000 } // n = 7, score = 100 // e8???????? | // 8d4c2430 | lea ecx, [esp + 0x30] // 668944245e | mov word ptr [esp + 0x5e], ax // e8???????? | // ba93244992 | mov edx, 0x92492493 // 89c1 | mov ecx, eax // c7042400000000 | mov dword ptr [esp], 0 $sequence_1 = { c745d0ffffffff 8b45d0 8d65f4 5b 5e 5f 5d } // n = 7, score = 100 // c745d0ffffffff | mov dword ptr [ebp - 0x30], 0xffffffff // 8b45d0 | mov eax, dword ptr [ebp - 0x30] // 8d65f4 | lea esp, [ebp - 0xc] // 5b | pop ebx // 5e | pop esi // 5f | pop edi // 5d | pop ebp $sequence_2 = { e9???????? 8b5518 89f1 891424 ffd0 83ec04 894510 } // n = 7, score = 100 // e9???????? | // 8b5518 | mov edx, dword ptr [ebp + 0x18] // 89f1 | mov ecx, esi // 891424 | mov dword ptr [esp], edx // ffd0 | call eax // 83ec04 | sub esp, 4 // 894510 | mov dword ptr [ebp + 0x10], eax $sequence_3 = { f3a4 e9???????? 6683bd60ffffff1e 668945c8 0f8785070000 83bd54ffffff01 0f8678070000 } // n = 7, score = 100 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // e9???????? | // 6683bd60ffffff1e | cmp word ptr [ebp - 0xa0], 0x1e // 668945c8 | mov word ptr [ebp - 0x38], ax // 0f8785070000 | ja 0x78b // 83bd54ffffff01 | cmp dword ptr [ebp - 0xac], 1 // 0f8678070000 | jbe 0x77e $sequence_4 = { e8???????? 8b542414 8b442410 8b4a08 85c9 7413 89442410 } // n = 7, score = 100 // e8???????? | // 8b542414 | mov edx, dword ptr [esp + 0x14] // 8b442410 | mov eax, dword ptr [esp + 0x10] // 8b4a08 | mov ecx, dword ptr [edx + 8] // 85c9 | test ecx, ecx // 7413 | je 0x15 // 89442410 | mov dword ptr [esp + 0x10], eax $sequence_5 = { e9???????? 837d1480 7520 31d2 e9???????? 83f802 7ebf } // n = 7, score = 100 // e9???????? | // 837d1480 | cmp dword ptr [ebp + 0x14], -0x80 // 7520 | jne 0x22 // 31d2 | xor edx, edx // e9???????? | // 83f802 | cmp eax, 2 // 7ebf | jle 0xffffffc1 $sequence_6 = { e8???????? 8b45e4 c744240400000000 89f1 8b5004 8b45e0 8b4004 } // n = 7, score = 100 // e8???????? | // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // c744240400000000 | mov dword ptr [esp + 4], 0 // 89f1 | mov ecx, esi // 8b5004 | mov edx, dword ptr [eax + 4] // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 8b4004 | mov eax, dword ptr [eax + 4] $sequence_7 = { e8???????? 8b45b4 8b10 85d2 7581 c744240804000000 c744240402000000 } // n = 7, score = 100 // e8???????? | // 8b45b4 | mov eax, dword ptr [ebp - 0x4c] // 8b10 | mov edx, dword ptr [eax] // 85d2 | test edx, edx // 7581 | jne 0xffffff83 // c744240804000000 | mov dword ptr [esp + 8], 4 // c744240402000000 | mov dword ptr [esp + 4], 2 $sequence_8 = { e9???????? 890424 e8???????? e9???????? 893c24 e8???????? 8b442414 } // n = 7, score = 100 // e9???????? | // 890424 | mov dword ptr [esp], eax // e8???????? | // e9???????? | // 893c24 | mov dword ptr [esp], edi // e8???????? | // 8b442414 | mov eax, dword ptr [esp + 0x14] $sequence_9 = { e9???????? 8b5d0c 85db 0f8481fdffff 31db eb21 8b7d14 } // n = 7, score = 100 // e9???????? | // 8b5d0c | mov ebx, dword ptr [ebp + 0xc] // 85db | test ebx, ebx // 0f8481fdffff | je 0xfffffd87 // 31db | xor ebx, ebx // eb21 | jmp 0x23 // 8b7d14 | mov edi, dword ptr [ebp + 0x14] condition: 7 of them and filesize < 12651520 }
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