Actor(s): Dropping Elephant
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rule win_tinytyphon_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "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 = { 8b55e0 c1e20a 8b45e0 c1e816 0bd0 } // n = 5, score = 200 // 8b55e0 | mov edx, dword ptr [ebp - 0x20] // c1e20a | shl edx, 0xa // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // c1e816 | shr eax, 0x16 // 0bd0 | or edx, eax $sequence_1 = { 0bd1 8b45f4 0fb6480f c1e118 0bd1 8b4508 895064 } // n = 7, score = 200 // 0bd1 | or edx, ecx // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 0fb6480f | movzx ecx, byte ptr [eax + 0xf] // c1e118 | shl ecx, 0x18 // 0bd1 | or edx, ecx // 8b4508 | mov eax, dword ptr [ebp + 8] // 895064 | mov dword ptr [eax + 0x64], edx $sequence_2 = { 50 8d8df0fdffff 51 ff15???????? 6a00 8d95f0fdffff 52 } // n = 7, score = 200 // 50 | push eax // 8d8df0fdffff | lea ecx, dword ptr [ebp - 0x210] // 51 | push ecx // ff15???????? | // 6a00 | push 0 // 8d95f0fdffff | lea edx, dword ptr [ebp - 0x210] // 52 | push edx $sequence_3 = { ff15???????? 8b15???????? 8995f4feffff eb0e 8b85f4feffff 8b08 898df4feffff } // n = 7, score = 200 // ff15???????? | // 8b15???????? | // 8995f4feffff | mov dword ptr [ebp - 0x10c], edx // eb0e | jmp 0x10 // 8b85f4feffff | mov eax, dword ptr [ebp - 0x10c] // 8b08 | mov ecx, dword ptr [eax] // 898df4feffff | mov dword ptr [ebp - 0x10c], ecx $sequence_4 = { 7e2d 8b45f0 8945f8 8b4dfc 8b55f0 8b02 } // n = 6, score = 200 // 7e2d | jle 0x2f // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8945f8 | mov dword ptr [ebp - 8], eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 8b55f0 | mov edx, dword ptr [ebp - 0x10] // 8b02 | mov eax, dword ptr [edx] $sequence_5 = { 234de4 334df8 8b5508 038a84000000 8b45dc } // n = 5, score = 200 // 234de4 | and ecx, dword ptr [ebp - 0x1c] // 334df8 | xor ecx, dword ptr [ebp - 8] // 8b5508 | mov edx, dword ptr [ebp + 8] // 038a84000000 | add ecx, dword ptr [edx + 0x84] // 8b45dc | mov eax, dword ptr [ebp - 0x24] $sequence_6 = { 898558ffffff 83bd58ffffff00 7409 83bd58ffffffff 750a b801000000 e9???????? } // n = 7, score = 200 // 898558ffffff | mov dword ptr [ebp - 0xa8], eax // 83bd58ffffff00 | cmp dword ptr [ebp - 0xa8], 0 // 7409 | je 0xb // 83bd58ffffffff | cmp dword ptr [ebp - 0xa8], -1 // 750a | jne 0xc // b801000000 | mov eax, 1 // e9???????? | $sequence_7 = { 0fb64827 c1e118 0bd1 8b4508 89507c } // n = 5, score = 200 // 0fb64827 | movzx ecx, byte ptr [eax + 0x27] // c1e118 | shl ecx, 0x18 // 0bd1 | or edx, ecx // 8b4508 | mov eax, dword ptr [ebp + 8] // 89507c | mov dword ptr [eax + 0x7c], edx $sequence_8 = { ff15???????? 037514 03c6 8985d4feffff 8b95d4feffff } // n = 5, score = 200 // ff15???????? | // 037514 | add esi, dword ptr [ebp + 0x14] // 03c6 | add eax, esi // 8985d4feffff | mov dword ptr [ebp - 0x12c], eax // 8b95d4feffff | mov edx, dword ptr [ebp - 0x12c] $sequence_9 = { 55 8bec 83ec10 c745fc???????? a1???????? } // n = 5, score = 200 // 55 | push ebp // 8bec | mov ebp, esp // 83ec10 | sub esp, 0x10 // c745fc???????? | // a1???????? | condition: 7 of them and filesize < 90112 }
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