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rule win_smanager_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.smanager." 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.smanager" 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 = { c7462cffffffff 7410 6a00 6a00 6830001100 } // n = 5, score = 600 // c7462cffffffff | mov dword ptr [esi + 0x2c], 0xffffffff // 7410 | je 0x12 // 6a00 | push 0 // 6a00 | push 0 // 6830001100 | push 0x110030 $sequence_1 = { 8b4510 85c0 7407 50 ff15???????? } // n = 5, score = 600 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 85c0 | test eax, eax // 7407 | je 9 // 50 | push eax // ff15???????? | $sequence_2 = { 8b7604 6a00 6a00 56 68???????? } // n = 5, score = 600 // 8b7604 | mov esi, dword ptr [esi + 4] // 6a00 | push 0 // 6a00 | push 0 // 56 | push esi // 68???????? | $sequence_3 = { 8b4608 85c0 7420 a801 } // n = 4, score = 600 // 8b4608 | mov eax, dword ptr [esi + 8] // 85c0 | test eax, eax // 7420 | je 0x22 // a801 | test al, 1 $sequence_4 = { 6a0d e8???????? 83c404 8bf0 } // n = 4, score = 600 // 6a0d | push 0xd // e8???????? | // 83c404 | add esp, 4 // 8bf0 | mov esi, eax $sequence_5 = { 6a00 6a00 ff15???????? 8bf8 897e28 } // n = 5, score = 600 // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // 8bf8 | mov edi, eax // 897e28 | mov dword ptr [esi + 0x28], edi $sequence_6 = { 83c602 6a22 56 e8???????? 83c408 85c0 } // n = 6, score = 600 // 83c602 | add esi, 2 // 6a22 | push 0x22 // 56 | push esi // e8???????? | // 83c408 | add esp, 8 // 85c0 | test eax, eax $sequence_7 = { 740e 3d45270000 7407 3d46270000 } // n = 4, score = 600 // 740e | je 0x10 // 3d45270000 | cmp eax, 0x2745 // 7407 | je 9 // 3d46270000 | cmp eax, 0x2746 $sequence_8 = { ff15???????? 32c0 e9???????? 0f1005???????? } // n = 4, score = 300 // ff15???????? | // 32c0 | xor al, al // e9???????? | // 0f1005???????? | $sequence_9 = { 0007 b15a 0007 b15a } // n = 4, score = 100 // 0007 | add byte ptr [ebx], al // b15a | mov cl, 0x57 // 0007 | add byte ptr [eax], al // b15a | or al, 0xc $sequence_10 = { 0003 b157 0000 0c0c } // n = 4, score = 100 // 0003 | add byte ptr [ecx], al // b157 | into // 0000 | push eax // 0c0c | add byte ptr [eax], cl $sequence_11 = { 720a 488b4c2448 e8???????? 488b8d70010000 4833cc e8???????? } // n = 6, score = 100 // 720a | test eax, eax // 488b4c2448 | cmp eax, 0x57 // e8???????? | // 488b8d70010000 | jne 0x1e6 // 4833cc | dec eax // e8???????? | $sequence_12 = { 0000 0c0c 0c0c 0c0c 0c0c 0c0c 0102 } // n = 7, score = 100 // 0000 | push 0xd // 0c0c | add esp, 4 // 0c0c | mov esi, eax // 0c0c | mov esi, dword ptr [esi + 4] // 0c0c | push 0 // 0c0c | push 0 // 0102 | push esi $sequence_13 = { 4c8bc6 ba57000000 488bcf e8???????? 488bd8 4885c0 7463 } // n = 7, score = 100 // 4c8bc6 | dec esp // ba57000000 | mov eax, esi // 488bcf | mov edx, 0x57 // e8???????? | // 488bd8 | dec eax // 4885c0 | mov ecx, edi // 7463 | dec eax $sequence_14 = { ff5308 83f801 7512 b001 } // n = 4, score = 100 // ff5308 | lea ecx, [0xc2ec] // 83f801 | inc ebp // 7512 | xor eax, eax // b001 | xor edx, edx $sequence_15 = { 0008 53 4f 00ef } // n = 4, score = 100 // 0008 | add byte ptr [edi], al // 53 | mov cl, 0x5a // 4f | add ah, al // 00ef | mov cl, 0x5a $sequence_16 = { 83f857 0f85e0010000 488d0decc20000 4533c0 33d2 ff15???????? } // n = 6, score = 100 // 83f857 | mov ecx, esi // 0f85e0010000 | mov edx, ebx // 488d0decc20000 | dec eax // 4533c0 | mov dword ptr [esp + 0x28], edi // 33d2 | dec esp // ff15???????? | $sequence_17 = { 488d442450 4533c9 448d4307 488bce 8bd3 48897c2428 } // n = 6, score = 100 // 488d442450 | mov ebx, eax // 4533c9 | dec eax // 448d4307 | test eax, eax // 488bce | je 0x65 // 8bd3 | dec eax // 48897c2428 | lea eax, [esp + 0x50] $sequence_18 = { 0007 b15a 00c4 b15a } // n = 4, score = 100 // 0007 | add byte ptr [edi], al // b15a | mov cl, 0x5a // 00c4 | add byte ptr [ecx - 0x76ffa550], cl // b15a | mov al, 0x5a $sequence_19 = { 4883ec20 8bf9 e8???????? 4885c0 7509 488d0593870100 eb04 } // n = 7, score = 100 // 4883ec20 | sub edx, 0x110020 // 8bf9 | je 0x8f // e8???????? | // 4885c0 | sub edx, 0x10 // 7509 | je 0x84 // 488d0593870100 | sub edx, 0x10 // eb04 | je 0x71 $sequence_20 = { 81ea20001100 0f8489000000 83ea10 7479 83ea10 7461 83ea30 } // n = 7, score = 100 // 81ea20001100 | mov eax, esi // 0f8489000000 | mov edx, 0x4d // 83ea10 | dec eax // 7479 | mov ecx, edi // 83ea10 | dec eax // 7461 | mov ebx, eax // 83ea30 | dec eax $sequence_21 = { 0007 b15a 0089b05a0089 b05a } // n = 4, score = 100 // 0007 | add byte ptr [edi], al // b15a | mov cl, 0x5a // 0089b05a0089 | add byte ptr [edi], al // b05a | mov cl, 0x5a $sequence_22 = { 0000 80ed4a 0044feff ff900100008c } // n = 4, score = 100 // 0000 | push 0 // 80ed4a | push 0 // 0044feff | push 0 // ff900100008c | mov edi, eax $sequence_23 = { 0001 ce 50 0008 } // n = 4, score = 100 // 0001 | add byte ptr [eax], al // ce | sub ch, 0x4a // 50 | add byte ptr [esi + edi*8 - 1], al // 0008 | call dword ptr [eax - 0x73ffffff] condition: 7 of them and filesize < 10013696 }
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