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rule win_greenshaitan_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.greenshaitan." 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.greenshaitan" 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 = { 57 8bf9 8bda 57 e8???????? 8bf0 85f6 } // n = 7, score = 100 // 57 | push edi // 8bf9 | mov edi, ecx // 8bda | mov ebx, edx // 57 | push edi // e8???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi $sequence_1 = { 8b442418 8b4c2424 83ec14 53 8b5c2438 55 56 } // n = 7, score = 100 // 8b442418 | mov eax, dword ptr [esp + 0x18] // 8b4c2424 | mov ecx, dword ptr [esp + 0x24] // 83ec14 | sub esp, 0x14 // 53 | push ebx // 8b5c2438 | mov ebx, dword ptr [esp + 0x38] // 55 | push ebp // 56 | push esi $sequence_2 = { 889c2480020000 e8???????? 8d573c 8d742430 e8???????? 6a00 50 } // n = 7, score = 100 // 889c2480020000 | mov byte ptr [esp + 0x280], bl // e8???????? | // 8d573c | lea edx, [edi + 0x3c] // 8d742430 | lea esi, [esp + 0x30] // e8???????? | // 6a00 | push 0 // 50 | push eax $sequence_3 = { ffd0 56 53 e8???????? 5b 8be5 } // n = 6, score = 100 // ffd0 | call eax // 56 | push esi // 53 | push ebx // e8???????? | // 5b | pop ebx // 8be5 | mov esp, ebp $sequence_4 = { 8bf0 c1ee02 8a9e685b6e00 0fb6d2 8bf2 83e003 } // n = 6, score = 100 // 8bf0 | mov esi, eax // c1ee02 | shr esi, 2 // 8a9e685b6e00 | mov bl, byte ptr [esi + 0x6e5b68] // 0fb6d2 | movzx edx, dl // 8bf2 | mov esi, edx // 83e003 | and eax, 3 $sequence_5 = { 8d7c2474 895c246c 885c245c e8???????? 50 bf???????? 8d74241c } // n = 7, score = 100 // 8d7c2474 | lea edi, [esp + 0x74] // 895c246c | mov dword ptr [esp + 0x6c], ebx // 885c245c | mov byte ptr [esp + 0x5c], bl // e8???????? | // 50 | push eax // bf???????? | // 8d74241c | lea esi, [esp + 0x1c] $sequence_6 = { 8b0424 7409 83caff 83c408 c20c00 8b542404 } // n = 6, score = 100 // 8b0424 | mov eax, dword ptr [esp] // 7409 | je 0xb // 83caff | or edx, 0xffffffff // 83c408 | add esp, 8 // c20c00 | ret 0xc // 8b542404 | mov edx, dword ptr [esp + 4] $sequence_7 = { 50 8d8f2c010000 51 8d8710010000 50 55 } // n = 6, score = 100 // 50 | push eax // 8d8f2c010000 | lea ecx, [edi + 0x12c] // 51 | push ecx // 8d8710010000 | lea eax, [edi + 0x110] // 50 | push eax // 55 | push ebp $sequence_8 = { 83e703 89442424 85c9 7511 } // n = 4, score = 100 // 83e703 | and edi, 3 // 89442424 | mov dword ptr [esp + 0x24], eax // 85c9 | test ecx, ecx // 7511 | jne 0x13 $sequence_9 = { 57 33c0 8d642400 880408 40 3d00010000 7cf5 } // n = 7, score = 100 // 57 | push edi // 33c0 | xor eax, eax // 8d642400 | lea esp, [esp] // 880408 | mov byte ptr [eax + ecx], al // 40 | inc eax // 3d00010000 | cmp eax, 0x100 // 7cf5 | jl 0xfffffff7 condition: 7 of them and filesize < 253952 }
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