Actor(s): Dropping Elephant
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rule win_tinytyphon_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8d8c08d9026f67 894ddc 8b55dc c1e20e 8b45dc } // n = 5, score = 200 // 8d8c08d9026f67 | lea ecx, [eax + ecx + 0x676f02d9] // 894ddc | mov dword ptr [ebp - 0x24], ecx // 8b55dc | mov edx, dword ptr [ebp - 0x24] // c1e20e | shl edx, 0xe // 8b45dc | mov eax, dword ptr [ebp - 0x24] $sequence_1 = { 8b4508 8b08 894df8 8b55f8 035510 81e2ffffff1f 8b4508 } // n = 7, score = 200 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b08 | mov ecx, dword ptr [eax] // 894df8 | mov dword ptr [ebp - 8], ecx // 8b55f8 | mov edx, dword ptr [ebp - 8] // 035510 | add edx, dword ptr [ebp + 0x10] // 81e2ffffff1f | and edx, 0x1fffffff // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_2 = { 8b55f8 c1ea19 0bca 894df8 8b45f8 0345e4 8945f8 } // n = 7, score = 200 // 8b55f8 | mov edx, dword ptr [ebp - 8] // c1ea19 | shr edx, 0x19 // 0bca | or ecx, edx // 894df8 | mov dword ptr [ebp - 8], ecx // 8b45f8 | mov eax, dword ptr [ebp - 8] // 0345e4 | add eax, dword ptr [ebp - 0x1c] // 8945f8 | mov dword ptr [ebp - 8], eax $sequence_3 = { 034164 8b55e0 8d840292cc0c8f 8945e0 8b4de0 c1e10a } // n = 6, score = 200 // 034164 | add eax, dword ptr [ecx + 0x64] // 8b55e0 | mov edx, dword ptr [ebp - 0x20] // 8d840292cc0c8f | lea eax, [edx + eax - 0x70f3336e] // 8945e0 | mov dword ptr [ebp - 0x20], eax // 8b4de0 | mov ecx, dword ptr [ebp - 0x20] // c1e10a | shl ecx, 0xa $sequence_4 = { 8d8c082211906b 894df8 8b55f8 c1e207 8b45f8 c1e819 0bd0 } // n = 7, score = 200 // 8d8c082211906b | lea ecx, [eax + ecx + 0x6b901122] // 894df8 | mov dword ptr [ebp - 8], ecx // 8b55f8 | mov edx, dword ptr [ebp - 8] // c1e207 | shl edx, 7 // 8b45f8 | mov eax, dword ptr [ebp - 8] // c1e819 | shr eax, 0x19 // 0bd0 | or edx, eax $sequence_5 = { c1e10a 8b55e0 c1ea16 0bca 894de0 8b45e0 } // n = 6, score = 200 // c1e10a | shl ecx, 0xa // 8b55e0 | mov edx, dword ptr [ebp - 0x20] // c1ea16 | shr edx, 0x16 // 0bca | or ecx, edx // 894de0 | mov dword ptr [ebp - 0x20], ecx // 8b45e0 | mov eax, dword ptr [ebp - 0x20] $sequence_6 = { 7d1e 8b4dc8 8b55d4 8a02 8801 8b4dc8 83c101 } // n = 7, score = 200 // 7d1e | jge 0x20 // 8b4dc8 | mov ecx, dword ptr [ebp - 0x38] // 8b55d4 | mov edx, dword ptr [ebp - 0x2c] // 8a02 | mov al, byte ptr [edx] // 8801 | mov byte ptr [ecx], al // 8b4dc8 | mov ecx, dword ptr [ebp - 0x38] // 83c101 | add ecx, 1 $sequence_7 = { 6800380000 ff15???????? ebd5 33c0 837df401 0f94c0 50 } // n = 7, score = 200 // 6800380000 | push 0x3800 // ff15???????? | // ebd5 | jmp 0xffffffd7 // 33c0 | xor eax, eax // 837df401 | cmp dword ptr [ebp - 0xc], 1 // 0f94c0 | sete al // 50 | push eax $sequence_8 = { 8b8de8feffff 51 ff15???????? 85c0 7557 8b9598fdffff 52 } // n = 7, score = 200 // 8b8de8feffff | mov ecx, dword ptr [ebp - 0x118] // 51 | push ecx // ff15???????? | // 85c0 | test eax, eax // 7557 | jne 0x59 // 8b9598fdffff | mov edx, dword ptr [ebp - 0x268] // 52 | push edx $sequence_9 = { e8???????? 83c404 837dfc03 7c23 837df000 741d ff15???????? } // n = 7, score = 200 // e8???????? | // 83c404 | add esp, 4 // 837dfc03 | cmp dword ptr [ebp - 4], 3 // 7c23 | jl 0x25 // 837df000 | cmp dword ptr [ebp - 0x10], 0 // 741d | je 0x1f // ff15???????? | condition: 7 of them and filesize < 90112 }
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