Actor(s): RAZOR TIGER
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rule win_sidewinder_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.sidewinder." 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.sidewinder" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8b4588 8b00 ff7588 ff5058 dbe2 894584 837d8400 } // n = 7, score = 200 // 8b4588 | mov eax, dword ptr [ebp - 0x78] // 8b00 | mov eax, dword ptr [eax] // ff7588 | push dword ptr [ebp - 0x78] // ff5058 | call dword ptr [eax + 0x58] // dbe2 | fnclex // 894584 | mov dword ptr [ebp - 0x7c], eax // 837d8400 | cmp dword ptr [ebp - 0x7c], 0 $sequence_1 = { 1bf6 f7de 6a23 ff75b8 e8???????? 0fb600 f7d8 } // n = 7, score = 200 // 1bf6 | sbb esi, esi // f7de | neg esi // 6a23 | push 0x23 // ff75b8 | push dword ptr [ebp - 0x48] // e8???????? | // 0fb600 | movzx eax, byte ptr [eax] // f7d8 | neg eax $sequence_2 = { 8d855cffffff 50 8b8544ffffff 8b00 ffb544ffffff ff909c000000 dbe2 } // n = 7, score = 200 // 8d855cffffff | lea eax, [ebp - 0xa4] // 50 | push eax // 8b8544ffffff | mov eax, dword ptr [ebp - 0xbc] // 8b00 | mov eax, dword ptr [eax] // ffb544ffffff | push dword ptr [ebp - 0xbc] // ff909c000000 | call dword ptr [eax + 0x9c] // dbe2 | fnclex $sequence_3 = { 7d17 6a34 68???????? ff75b0 ff75c4 e8???????? 894590 } // n = 7, score = 200 // 7d17 | jge 0x19 // 6a34 | push 0x34 // 68???????? | // ff75b0 | push dword ptr [ebp - 0x50] // ff75c4 | push dword ptr [ebp - 0x3c] // e8???????? | // 894590 | mov dword ptr [ebp - 0x70], eax $sequence_4 = { ff75ec 8d45dc 50 e8???????? 83a540ffffff00 83bd40ffffff14 7309 } // n = 7, score = 200 // ff75ec | push dword ptr [ebp - 0x14] // 8d45dc | lea eax, [ebp - 0x24] // 50 | push eax // e8???????? | // 83a540ffffff00 | and dword ptr [ebp - 0xc0], 0 // 83bd40ffffff14 | cmp dword ptr [ebp - 0xc0], 0x14 // 7309 | jae 0xb $sequence_5 = { 8b4dcc 660fb60c08 6683e103 666bc940 0f8022050000 8b4508 8b4048 } // n = 7, score = 200 // 8b4dcc | mov ecx, dword ptr [ebp - 0x34] // 660fb60c08 | movzx cx, byte ptr [eax + ecx] // 6683e103 | and cx, 3 // 666bc940 | imul cx, cx, 0x40 // 0f8022050000 | jo 0x528 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b4048 | mov eax, dword ptr [eax + 0x48] $sequence_6 = { 89857cffffff ff75d4 8b450c ff30 e8???????? 0fb600 83e82b } // n = 7, score = 200 // 89857cffffff | mov dword ptr [ebp - 0x84], eax // ff75d4 | push dword ptr [ebp - 0x2c] // 8b450c | mov eax, dword ptr [ebp + 0xc] // ff30 | push dword ptr [eax] // e8???????? | // 0fb600 | movzx eax, byte ptr [eax] // 83e82b | sub eax, 0x2b $sequence_7 = { dd5dd4 8d45d4 50 8b45ec 8b00 } // n = 5, score = 200 // dd5dd4 | fstp qword ptr [ebp - 0x2c] // 8d45d4 | lea eax, [ebp - 0x2c] // 50 | push eax // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8b00 | mov eax, dword ptr [eax] $sequence_8 = { 68???????? e8???????? f7d8 1bc0 f7d8 f7d8 } // n = 6, score = 200 // 68???????? | // e8???????? | // f7d8 | neg eax // 1bc0 | sbb eax, eax // f7d8 | neg eax // f7d8 | neg eax $sequence_9 = { eb04 83659800 8b4508 8a4040 8845b8 6633c9 e8???????? } // n = 7, score = 200 // eb04 | jmp 6 // 83659800 | and dword ptr [ebp - 0x68], 0 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8a4040 | mov al, byte ptr [eax + 0x40] // 8845b8 | mov byte ptr [ebp - 0x48], al // 6633c9 | xor cx, cx // e8???????? | condition: 7 of them and filesize < 679936 }
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