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rule win_xbot_pos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.xbot_pos." 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.xbot_pos" 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 = { 52 8d85e4f1ffff 50 e8???????? 83c40c 898500f1ffff 8b8d00f1ffff } // n = 7, score = 100 // 52 | push edx // 8d85e4f1ffff | lea eax, dword ptr [ebp - 0xe1c] // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 898500f1ffff | mov dword ptr [ebp - 0xf00], eax // 8b8d00f1ffff | mov ecx, dword ptr [ebp - 0xf00] $sequence_1 = { 837d1000 740b 8b5510 8995e0ddffff eb0a c785e0ddffffa0925400 837d1000 } // n = 7, score = 100 // 837d1000 | cmp dword ptr [ebp + 0x10], 0 // 740b | je 0xd // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 8995e0ddffff | mov dword ptr [ebp - 0x2220], edx // eb0a | jmp 0xc // c785e0ddffffa0925400 | mov dword ptr [ebp - 0x2220], 0x5492a0 // 837d1000 | cmp dword ptr [ebp + 0x10], 0 $sequence_2 = { 8d8decfeffff e8???????? 8d8da8fcffff e8???????? 8d8588fcffff 50 8b4de8 } // n = 7, score = 100 // 8d8decfeffff | lea ecx, dword ptr [ebp - 0x114] // e8???????? | // 8d8da8fcffff | lea ecx, dword ptr [ebp - 0x358] // e8???????? | // 8d8588fcffff | lea eax, dword ptr [ebp - 0x378] // 50 | push eax // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] $sequence_3 = { e9???????? 8b4d0c 83e90b 51 8b5508 83ea0b } // n = 6, score = 100 // e9???????? | // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 83e90b | sub ecx, 0xb // 51 | push ecx // 8b5508 | mov edx, dword ptr [ebp + 8] // 83ea0b | sub edx, 0xb $sequence_4 = { 898550feffff 8b8d50feffff 0fbe11 85d2 0f8541010000 8b45dc 8945d0 } // n = 7, score = 100 // 898550feffff | mov dword ptr [ebp - 0x1b0], eax // 8b8d50feffff | mov ecx, dword ptr [ebp - 0x1b0] // 0fbe11 | movsx edx, byte ptr [ecx] // 85d2 | test edx, edx // 0f8541010000 | jne 0x147 // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 8945d0 | mov dword ptr [ebp - 0x30], eax $sequence_5 = { 006f49 4c 007c494c 0089494c0096 49 } // n = 5, score = 100 // 006f49 | add byte ptr [edi + 0x49], ch // 4c | dec esp // 007c494c | add byte ptr [ecx + ecx*2 + 0x4c], bh // 0089494c0096 | add byte ptr [ecx - 0x69ffb3b7], cl // 49 | dec ecx $sequence_6 = { 7535 8b4df8 e8???????? 8b4d0c 3b08 730b 8b550c } // n = 7, score = 100 // 7535 | jne 0x37 // 8b4df8 | mov ecx, dword ptr [ebp - 8] // e8???????? | // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 3b08 | cmp ecx, dword ptr [eax] // 730b | jae 0xd // 8b550c | mov edx, dword ptr [ebp + 0xc] $sequence_7 = { 85c9 7408 8b55f0 8955e0 eb07 c745e0c8415600 } // n = 6, score = 100 // 85c9 | test ecx, ecx // 7408 | je 0xa // 8b55f0 | mov edx, dword ptr [ebp - 0x10] // 8955e0 | mov dword ptr [ebp - 0x20], edx // eb07 | jmp 9 // c745e0c8415600 | mov dword ptr [ebp - 0x20], 0x5641c8 $sequence_8 = { 03c8 898d2cfeffff 8b8d58fcffff 0fb711 8d049560885500 898544fcffff 8b8d58fcffff } // n = 7, score = 100 // 03c8 | add ecx, eax // 898d2cfeffff | mov dword ptr [ebp - 0x1d4], ecx // 8b8d58fcffff | mov ecx, dword ptr [ebp - 0x3a8] // 0fb711 | movzx edx, word ptr [ecx] // 8d049560885500 | lea eax, dword ptr [edx*4 + 0x558860] // 898544fcffff | mov dword ptr [ebp - 0x3bc], eax // 8b8d58fcffff | mov ecx, dword ptr [ebp - 0x3a8] $sequence_9 = { 8bcd 50 8d1560844800 e8???????? 58 5a 5f } // n = 7, score = 100 // 8bcd | mov ecx, ebp // 50 | push eax // 8d1560844800 | lea edx, dword ptr [0x488460] // e8???????? | // 58 | pop eax // 5a | pop edx // 5f | pop edi condition: 7 of them and filesize < 3031040 }
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