Actor(s): IXESHE
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rule win_threebyte_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.threebyte." 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.threebyte" 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 = { c685eafbffff2f c685ebfbffff35 c685ecfbffff2e c685edfbffff30 c685eefbffff29 c685effbffff00 c645f447 } // n = 7, score = 200 // c685eafbffff2f | mov byte ptr [ebp - 0x416], 0x2f // c685ebfbffff35 | mov byte ptr [ebp - 0x415], 0x35 // c685ecfbffff2e | mov byte ptr [ebp - 0x414], 0x2e // c685edfbffff30 | mov byte ptr [ebp - 0x413], 0x30 // c685eefbffff29 | mov byte ptr [ebp - 0x412], 0x29 // c685effbffff00 | mov byte ptr [ebp - 0x411], 0 // c645f447 | mov byte ptr [ebp - 0xc], 0x47 $sequence_1 = { 50 e8???????? 83c404 83c8ff eb44 8b8d24f7ffff 038d14f7ffff } // n = 7, score = 200 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 83c8ff | or eax, 0xffffffff // eb44 | jmp 0x46 // 8b8d24f7ffff | mov ecx, dword ptr [ebp - 0x8dc] // 038d14f7ffff | add ecx, dword ptr [ebp - 0x8ec] $sequence_2 = { 52 e8???????? 83c408 8d85e8feffff 50 8b4d08 51 } // n = 7, score = 200 // 52 | push edx // e8???????? | // 83c408 | add esp, 8 // 8d85e8feffff | lea eax, [ebp - 0x118] // 50 | push eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 51 | push ecx $sequence_3 = { c685f0fdffff45 c685f1fdffff72 c685f2fdffff72 c685f3fdffff6f c685f4fdffff72 c685f5fdffff21 c685f6fdffff0d } // n = 7, score = 200 // c685f0fdffff45 | mov byte ptr [ebp - 0x210], 0x45 // c685f1fdffff72 | mov byte ptr [ebp - 0x20f], 0x72 // c685f2fdffff72 | mov byte ptr [ebp - 0x20e], 0x72 // c685f3fdffff6f | mov byte ptr [ebp - 0x20d], 0x6f // c685f4fdffff72 | mov byte ptr [ebp - 0x20c], 0x72 // c685f5fdffff21 | mov byte ptr [ebp - 0x20b], 0x21 // c685f6fdffff0d | mov byte ptr [ebp - 0x20a], 0xd $sequence_4 = { 8b4d08 33d2 8a11 8955f8 8b4508 83c001 } // n = 6, score = 200 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 33d2 | xor edx, edx // 8a11 | mov dl, byte ptr [ecx] // 8955f8 | mov dword ptr [ebp - 8], edx // 8b4508 | mov eax, dword ptr [ebp + 8] // 83c001 | add eax, 1 $sequence_5 = { 51 8d8d38feffff e8???????? 85c0 7517 6830750000 ff15???????? } // n = 7, score = 200 // 51 | push ecx // 8d8d38feffff | lea ecx, [ebp - 0x1c8] // e8???????? | // 85c0 | test eax, eax // 7517 | jne 0x19 // 6830750000 | push 0x7530 // ff15???????? | $sequence_6 = { 51 8d956cfbffff 52 6813000020 8b8564f7ffff 50 8b8d10f7ffff } // n = 7, score = 200 // 51 | push ecx // 8d956cfbffff | lea edx, [ebp - 0x494] // 52 | push edx // 6813000020 | push 0x20000013 // 8b8564f7ffff | mov eax, dword ptr [ebp - 0x89c] // 50 | push eax // 8b8d10f7ffff | mov ecx, dword ptr [ebp - 0x8f0] $sequence_7 = { 8d9518f7ffff 52 6805000020 8b8564f7ffff 50 8b8d10f7ffff ff5120 } // n = 7, score = 200 // 8d9518f7ffff | lea edx, [ebp - 0x8e8] // 52 | push edx // 6805000020 | push 0x20000005 // 8b8564f7ffff | mov eax, dword ptr [ebp - 0x89c] // 50 | push eax // 8b8d10f7ffff | mov ecx, dword ptr [ebp - 0x8f0] // ff5120 | call dword ptr [ecx + 0x20] $sequence_8 = { 52 6a00 ff15???????? 85c0 0f85ff000000 c68518ffffff43 c68519ffffff52 } // n = 7, score = 200 // 52 | push edx // 6a00 | push 0 // ff15???????? | // 85c0 | test eax, eax // 0f85ff000000 | jne 0x105 // c68518ffffff43 | mov byte ptr [ebp - 0xe8], 0x43 // c68519ffffff52 | mov byte ptr [ebp - 0xe7], 0x52 $sequence_9 = { 8b4dfc c6013d 8b55fc 83c201 8955fc 8b45fc 2b4510 } // n = 7, score = 200 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // c6013d | mov byte ptr [ecx], 0x3d // 8b55fc | mov edx, dword ptr [ebp - 4] // 83c201 | add edx, 1 // 8955fc | mov dword ptr [ebp - 4], edx // 8b45fc | mov eax, dword ptr [ebp - 4] // 2b4510 | sub eax, dword ptr [ebp + 0x10] condition: 7 of them and filesize < 180224 }
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