Actor(s): Dropping Elephant
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rule win_tinytyphon_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.tinytyphon." 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.tinytyphon" 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 = { 50 8d4dfc 51 6a00 6806000200 6a00 } // n = 6, score = 200 // 50 | push eax // 8d4dfc | lea ecx, [ebp - 4] // 51 | push ecx // 6a00 | push 0 // 6806000200 | push 0x20006 // 6a00 | push 0 $sequence_1 = { 50 8d95f0fdffff 52 6a01 a1???????? 50 8d8de0fbffff } // n = 7, score = 200 // 50 | push eax // 8d95f0fdffff | lea edx, [ebp - 0x210] // 52 | push edx // 6a01 | push 1 // a1???????? | // 50 | push eax // 8d8de0fbffff | lea ecx, [ebp - 0x420] $sequence_2 = { ff15???????? 83c418 6898000000 6a00 8b550c 52 e8???????? } // n = 7, score = 200 // ff15???????? | // 83c418 | add esp, 0x18 // 6898000000 | push 0x98 // 6a00 | push 0 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 52 | push edx // e8???????? | $sequence_3 = { ff15???????? 50 ff15???????? 8b85e8feffff 50 ff15???????? 8b8da0fdffff } // n = 7, score = 200 // ff15???????? | // 50 | push eax // ff15???????? | // 8b85e8feffff | mov eax, dword ptr [ebp - 0x118] // 50 | push eax // ff15???????? | // 8b8da0fdffff | mov ecx, dword ptr [ebp - 0x260] $sequence_4 = { c7458800000000 c745e000000000 c645ac00 c645ad00 c645ae00 c645af00 c645b000 } // n = 7, score = 200 // c7458800000000 | mov dword ptr [ebp - 0x78], 0 // c745e000000000 | mov dword ptr [ebp - 0x20], 0 // c645ac00 | mov byte ptr [ebp - 0x54], 0 // c645ad00 | mov byte ptr [ebp - 0x53], 0 // c645ae00 | mov byte ptr [ebp - 0x52], 0 // c645af00 | mov byte ptr [ebp - 0x51], 0 // c645b000 | mov byte ptr [ebp - 0x50], 0 $sequence_5 = { 668955fc 33c0 668945fc eb0c 668b4dfc 6683c101 66894dfc } // n = 7, score = 200 // 668955fc | mov word ptr [ebp - 4], dx // 33c0 | xor eax, eax // 668945fc | mov word ptr [ebp - 4], ax // eb0c | jmp 0xe // 668b4dfc | mov cx, word ptr [ebp - 4] // 6683c101 | add cx, 1 // 66894dfc | mov word ptr [ebp - 4], cx $sequence_6 = { 0f94c0 50 e8???????? 83c404 c745fc00000000 c745ec00000000 c745f000000000 } // n = 7, score = 200 // 0f94c0 | sete al // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // c745fc00000000 | mov dword ptr [ebp - 4], 0 // c745ec00000000 | mov dword ptr [ebp - 0x14], 0 // c745f000000000 | mov dword ptr [ebp - 0x10], 0 $sequence_7 = { eb09 8b4dc0 83e901 894dc0 837dc000 7c12 8b55c8 } // n = 7, score = 200 // eb09 | jmp 0xb // 8b4dc0 | mov ecx, dword ptr [ebp - 0x40] // 83e901 | sub ecx, 1 // 894dc0 | mov dword ptr [ebp - 0x40], ecx // 837dc000 | cmp dword ptr [ebp - 0x40], 0 // 7c12 | jl 0x14 // 8b55c8 | mov edx, dword ptr [ebp - 0x38] $sequence_8 = { 0fb74dfc 0fb75510 3bca 7d0f 0fb745fc } // n = 5, score = 200 // 0fb74dfc | movzx ecx, word ptr [ebp - 4] // 0fb75510 | movzx edx, word ptr [ebp + 0x10] // 3bca | cmp ecx, edx // 7d0f | jge 0x11 // 0fb745fc | movzx eax, word ptr [ebp - 4] $sequence_9 = { 8b450c 8b4d0c 8a11 885050 8b450c 8b08 c1e908 } // n = 7, score = 200 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 8a11 | mov dl, byte ptr [ecx] // 885050 | mov byte ptr [eax + 0x50], dl // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8b08 | mov ecx, dword ptr [eax] // c1e908 | shr ecx, 8 condition: 7 of them and filesize < 90112 }
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