Actor(s): BlackTech
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rule win_icondown_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.icondown." 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.icondown" 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 = { 85c9 740d 8b01 6a01 ff10 8b4e10 } // n = 6, score = 200 // 85c9 | test ecx, ecx // 740d | je 0xf // 8b01 | mov eax, dword ptr [ecx] // 6a01 | push 1 // ff10 | call dword ptr [eax] // 8b4e10 | mov ecx, dword ptr [esi + 0x10] $sequence_1 = { 884c2436 88442437 8844243f 884c2441 884c2444 } // n = 5, score = 200 // 884c2436 | mov byte ptr [esp + 0x36], cl // 88442437 | mov byte ptr [esp + 0x37], al // 8844243f | mov byte ptr [esp + 0x3f], al // 884c2441 | mov byte ptr [esp + 0x41], cl // 884c2444 | mov byte ptr [esp + 0x44], cl $sequence_2 = { 6828130000 52 ff15???????? 8b4c2420 8b442418 8b54241c 2bc8 } // n = 7, score = 200 // 6828130000 | push 0x1328 // 52 | push edx // ff15???????? | // 8b4c2420 | mov ecx, dword ptr [esp + 0x20] // 8b442418 | mov eax, dword ptr [esp + 0x18] // 8b54241c | mov edx, dword ptr [esp + 0x1c] // 2bc8 | sub ecx, eax $sequence_3 = { 8b09 8988c0000000 c3 8bc1 83600400 } // n = 5, score = 200 // 8b09 | mov ecx, dword ptr [ecx] // 8988c0000000 | mov dword ptr [eax + 0xc0], ecx // c3 | ret // 8bc1 | mov eax, ecx // 83600400 | and dword ptr [eax + 4], 0 $sequence_4 = { 48 89866c1e4500 740c 8b442414 3986601e4500 7538 8b86681e4500 } // n = 7, score = 200 // 48 | dec eax // 89866c1e4500 | mov dword ptr [esi + 0x451e6c], eax // 740c | je 0xe // 8b442414 | mov eax, dword ptr [esp + 0x14] // 3986601e4500 | cmp dword ptr [esi + 0x451e60], eax // 7538 | jne 0x3a // 8b86681e4500 | mov eax, dword ptr [esi + 0x451e68] $sequence_5 = { 51 8b4c2420 2bd1 52 50 51 8b4c2450 } // n = 7, score = 200 // 51 | push ecx // 8b4c2420 | mov ecx, dword ptr [esp + 0x20] // 2bd1 | sub edx, ecx // 52 | push edx // 50 | push eax // 51 | push ecx // 8b4c2450 | mov ecx, dword ptr [esp + 0x50] $sequence_6 = { 6a6c 89742410 e8???????? 8dbeb8000000 c744241400000000 8bcf e8???????? } // n = 7, score = 200 // 6a6c | push 0x6c // 89742410 | mov dword ptr [esp + 0x10], esi // e8???????? | // 8dbeb8000000 | lea edi, [esi + 0xb8] // c744241400000000 | mov dword ptr [esp + 0x14], 0 // 8bcf | mov ecx, edi // e8???????? | $sequence_7 = { 84c0 7407 c644242401 ebbf 5f 5e 5d } // n = 7, score = 200 // 84c0 | test al, al // 7407 | je 9 // c644242401 | mov byte ptr [esp + 0x24], 1 // ebbf | jmp 0xffffffc1 // 5f | pop edi // 5e | pop esi // 5d | pop ebp $sequence_8 = { ff2485bc2f4000 56 8d44246c 55 50 e8???????? 83c40c } // n = 7, score = 200 // ff2485bc2f4000 | jmp dword ptr [eax*4 + 0x402fbc] // 56 | push esi // 8d44246c | lea eax, [esp + 0x6c] // 55 | push ebp // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc $sequence_9 = { 2bd9 2be8 33c9 33c0 } // n = 4, score = 200 // 2bd9 | sub ebx, ecx // 2be8 | sub ebp, eax // 33c9 | xor ecx, ecx // 33c0 | xor eax, eax condition: 7 of them and filesize < 5505024 }
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