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rule win_stabuniq_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.stabuniq." 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.stabuniq" 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 = { 81c2e8110000 52 8b4510 ff5050 50 8b4d10 } // n = 6, score = 100 // 81c2e8110000 | add edx, 0x11e8 // 52 | push edx // 8b4510 | mov eax, dword ptr [ebp + 0x10] // ff5050 | call dword ptr [eax + 0x50] // 50 | push eax // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] $sequence_1 = { 8b5508 0fbe840a1c0c0000 85c0 0f84b2000000 c745b800000000 8b4dc0 6bc924 } // n = 7, score = 100 // 8b5508 | mov edx, dword ptr [ebp + 8] // 0fbe840a1c0c0000 | movsx eax, byte ptr [edx + ecx + 0xc1c] // 85c0 | test eax, eax // 0f84b2000000 | je 0xb8 // c745b800000000 | mov dword ptr [ebp - 0x48], 0 // 8b4dc0 | mov ecx, dword ptr [ebp - 0x40] // 6bc924 | imul ecx, ecx, 0x24 $sequence_2 = { 8b8204010000 8985c4feffff ebd2 83bdc8feffff00 743c 8b8dc8feffff } // n = 6, score = 100 // 8b8204010000 | mov eax, dword ptr [edx + 0x104] // 8985c4feffff | mov dword ptr [ebp - 0x13c], eax // ebd2 | jmp 0xffffffd4 // 83bdc8feffff00 | cmp dword ptr [ebp - 0x138], 0 // 743c | je 0x3e // 8b8dc8feffff | mov ecx, dword ptr [ebp - 0x138] $sequence_3 = { 50 8b4d0c ff9178010000 8945f8 837df800 7507 33c0 } // n = 7, score = 100 // 50 | push eax // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // ff9178010000 | call dword ptr [ecx + 0x178] // 8945f8 | mov dword ptr [ebp - 8], eax // 837df800 | cmp dword ptr [ebp - 8], 0 // 7507 | jne 9 // 33c0 | xor eax, eax $sequence_4 = { 50 8b4d08 ff9194010000 83f801 0f8524010000 8b5508 } // n = 6, score = 100 // 50 | push eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] // ff9194010000 | call dword ptr [ecx + 0x194] // 83f801 | cmp eax, 1 // 0f8524010000 | jne 0x12a // 8b5508 | mov edx, dword ptr [ebp + 8] $sequence_5 = { 8b951cfdffff 8b4210 50 8b8d1cfdffff 8b550c 035114 } // n = 6, score = 100 // 8b951cfdffff | mov edx, dword ptr [ebp - 0x2e4] // 8b4210 | mov eax, dword ptr [edx + 0x10] // 50 | push eax // 8b8d1cfdffff | mov ecx, dword ptr [ebp - 0x2e4] // 8b550c | mov edx, dword ptr [ebp + 0xc] // 035114 | add edx, dword ptr [ecx + 0x14] $sequence_6 = { ff15???????? 837d0c00 0f8488010000 837d1400 0f847e010000 8b4508 } // n = 6, score = 100 // ff15???????? | // 837d0c00 | cmp dword ptr [ebp + 0xc], 0 // 0f8488010000 | je 0x18e // 837d1400 | cmp dword ptr [ebp + 0x14], 0 // 0f847e010000 | je 0x184 // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_7 = { 52 8b4508 ff909c000000 8b4d08 8981d8010000 ba01000000 85d2 } // n = 7, score = 100 // 52 | push edx // 8b4508 | mov eax, dword ptr [ebp + 8] // ff909c000000 | call dword ptr [eax + 0x9c] // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8981d8010000 | mov dword ptr [ecx + 0x1d8], eax // ba01000000 | mov edx, 1 // 85d2 | test edx, edx $sequence_8 = { ff90a0010000 837df401 7707 33c0 e9???????? 8b4df4 51 } // n = 7, score = 100 // ff90a0010000 | call dword ptr [eax + 0x1a0] // 837df401 | cmp dword ptr [ebp - 0xc], 1 // 7707 | ja 9 // 33c0 | xor eax, eax // e9???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 51 | push ecx $sequence_9 = { 894df4 c745e800000000 8b55f4 833a00 747c 8b45f4 } // n = 6, score = 100 // 894df4 | mov dword ptr [ebp - 0xc], ecx // c745e800000000 | mov dword ptr [ebp - 0x18], 0 // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 833a00 | cmp dword ptr [edx], 0 // 747c | je 0x7e // 8b45f4 | mov eax, dword ptr [ebp - 0xc] condition: 7 of them and filesize < 57344 }
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