Actor(s): APT32
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rule win_salgorea_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.salgorea." 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.salgorea" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 66c1e105 9e f7d1 53 } // n = 5, score = 300 // 51 | push ecx // 66c1e105 | shl cx, 5 // 9e | sahf // f7d1 | not ecx // 53 | push ebx $sequence_1 = { 51 66b9bc00 66f7e1 53 c1fb02 d50a 8bc3 } // n = 7, score = 300 // 51 | push ecx // 66b9bc00 | mov cx, 0xbc // 66f7e1 | mul cx // 53 | push ebx // c1fb02 | sar ebx, 2 // d50a | aad // 8bc3 | mov eax, ebx $sequence_2 = { 51 66b9b469 66f7f1 f7da 66b89e00 66b97900 66f7e1 } // n = 7, score = 300 // 51 | push ecx // 66b9b469 | mov cx, 0x69b4 // 66f7f1 | div cx // f7da | neg edx // 66b89e00 | mov ax, 0x9e // 66b97900 | mov cx, 0x79 // 66f7e1 | mul cx $sequence_3 = { 66c1e804 8b44240c 0fbafa00 0fbcd2 8b542418 52 9d } // n = 7, score = 300 // 66c1e804 | shr ax, 4 // 8b44240c | mov eax, dword ptr [esp + 0xc] // 0fbafa00 | btc edx, 0 // 0fbcd2 | bsf edx, edx // 8b542418 | mov edx, dword ptr [esp + 0x18] // 52 | push edx // 9d | popfd $sequence_4 = { 27 664a 43 37 } // n = 4, score = 300 // 27 | daa // 664a | dec dx // 43 | inc ebx // 37 | aaa $sequence_5 = { 66c1e804 f8 660fbae803 f8 0fcb 33d8 } // n = 6, score = 300 // 66c1e804 | shr ax, 4 // f8 | clc // 660fbae803 | bts ax, 3 // f8 | clc // 0fcb | bswap ebx // 33d8 | xor ebx, eax $sequence_6 = { 66c1e306 80eb38 80e6ee f8 f6d1 52 40 } // n = 7, score = 300 // 66c1e306 | shl bx, 6 // 80eb38 | sub bl, 0x38 // 80e6ee | and dh, 0xee // f8 | clc // f6d1 | not cl // 52 | push edx // 40 | inc eax $sequence_7 = { 51 6698 f7db 33d2 b889510000 b98c0b0000 f7f1 } // n = 7, score = 300 // 51 | push ecx // 6698 | cbw // f7db | neg ebx // 33d2 | xor edx, edx // b889510000 | mov eax, 0x5189 // b98c0b0000 | mov ecx, 0xb8c // f7f1 | div ecx $sequence_8 = { a1???????? 8945cc 8d45cc 3930 } // n = 4, score = 200 // a1???????? | // 8945cc | mov dword ptr [ebp - 0x34], eax // 8d45cc | lea eax, dword ptr [ebp - 0x34] // 3930 | cmp dword ptr [eax], esi $sequence_9 = { 8d85bcfeffff 50 53 68???????? ffb5c4feffff 899dbcfeffff c785c0feffff24010000 } // n = 7, score = 100 // 8d85bcfeffff | lea eax, dword ptr [ebp - 0x144] // 50 | push eax // 53 | push ebx // 68???????? | // ffb5c4feffff | push dword ptr [ebp - 0x13c] // 899dbcfeffff | mov dword ptr [ebp - 0x144], ebx // c785c0feffff24010000 | mov dword ptr [ebp - 0x140], 0x124 $sequence_10 = { 8d85bdfcffff 83e841 c745f4c0ffffff 297df4 } // n = 4, score = 100 // 8d85bdfcffff | lea eax, dword ptr [ebp - 0x343] // 83e841 | sub eax, 0x41 // c745f4c0ffffff | mov dword ptr [ebp - 0xc], 0xffffffc0 // 297df4 | sub dword ptr [ebp - 0xc], edi $sequence_11 = { 8d85c0feffff 0fb70a 83c202 8808 } // n = 4, score = 100 // 8d85c0feffff | lea eax, dword ptr [ebp - 0x140] // 0fb70a | movzx ecx, word ptr [edx] // 83c202 | add edx, 2 // 8808 | mov byte ptr [eax], cl $sequence_12 = { 8d85bdfcffff 8945ec 8d85ddfcffff 83e841 } // n = 4, score = 100 // 8d85bdfcffff | lea eax, dword ptr [ebp - 0x343] // 8945ec | mov dword ptr [ebp - 0x14], eax // 8d85ddfcffff | lea eax, dword ptr [ebp - 0x323] // 83e841 | sub eax, 0x41 $sequence_13 = { 8d85c0feffff 50 8d85c8feffff 50 8d85bcfeffff } // n = 5, score = 100 // 8d85c0feffff | lea eax, dword ptr [ebp - 0x140] // 50 | push eax // 8d85c8feffff | lea eax, dword ptr [ebp - 0x138] // 50 | push eax // 8d85bcfeffff | lea eax, dword ptr [ebp - 0x144] $sequence_14 = { 8d85c0fcffff e8???????? 33c0 899d60fcffff } // n = 4, score = 100 // 8d85c0fcffff | lea eax, dword ptr [ebp - 0x340] // e8???????? | // 33c0 | xor eax, eax // 899d60fcffff | mov dword ptr [ebp - 0x3a0], ebx $sequence_15 = { 8d85c0fcffff 50 8d85a4fcffff 50 } // n = 4, score = 100 // 8d85c0fcffff | lea eax, dword ptr [ebp - 0x340] // 50 | push eax // 8d85a4fcffff | lea eax, dword ptr [ebp - 0x35c] // 50 | push eax condition: 7 of them and filesize < 2007040 }
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