Actor(s): PROMETHIUM, StrongPity
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rule win_strongpity_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.strongpity." 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.strongpity" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 7408 8818 40 83e901 75f8 ff75ec } // n = 7, score = 700 // 85c9 | test ecx, ecx // 7408 | je 0xa // 8818 | mov byte ptr [eax], bl // 40 | inc eax // 83e901 | sub ecx, 1 // 75f8 | jne 0xfffffffa // ff75ec | push dword ptr [ebp - 0x14] $sequence_1 = { 6800000020 bb???????? 6aff 0f45d8 53 56 } // n = 6, score = 700 // 6800000020 | push 0x20000000 // bb???????? | // 6aff | push -1 // 0f45d8 | cmovne ebx, eax // 53 | push ebx // 56 | push esi $sequence_2 = { 83e901 75f8 57 e8???????? 59 8b4df0 } // n = 6, score = 700 // 83e901 | sub ecx, 1 // 75f8 | jne 0xfffffffa // 57 | push edi // e8???????? | // 59 | pop ecx // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] $sequence_3 = { ff36 e8???????? 8b45d4 83c40c 894604 b908020000 } // n = 6, score = 700 // ff36 | push dword ptr [esi] // e8???????? | // 8b45d4 | mov eax, dword ptr [ebp - 0x2c] // 83c40c | add esp, 0xc // 894604 | mov dword ptr [esi + 4], eax // b908020000 | mov ecx, 0x208 $sequence_4 = { 58 6a68 668945ea 58 6a3a } // n = 5, score = 700 // 58 | pop eax // 6a68 | push 0x68 // 668945ea | mov word ptr [ebp - 0x16], ax // 58 | pop eax // 6a3a | push 0x3a $sequence_5 = { ff15???????? 85c0 74b8 6a14 59 } // n = 5, score = 700 // ff15???????? | // 85c0 | test eax, eax // 74b8 | je 0xffffffba // 6a14 | push 0x14 // 59 | pop ecx $sequence_6 = { 75f4 8d45c0 2bca 50 } // n = 4, score = 700 // 75f4 | jne 0xfffffff6 // 8d45c0 | lea eax, [ebp - 0x40] // 2bca | sub ecx, edx // 50 | push eax $sequence_7 = { 40 83e901 75f7 56 e8???????? } // n = 5, score = 700 // 40 | inc eax // 83e901 | sub ecx, 1 // 75f7 | jne 0xfffffff9 // 56 | push esi // e8???????? | $sequence_8 = { 5f 5e 8990b0010000 8bc5 5d 5b 83c40c } // n = 7, score = 300 // 5f | pop edi // 5e | pop esi // 8990b0010000 | mov dword ptr [eax + 0x1b0], edx // 8bc5 | mov eax, ebp // 5d | pop ebp // 5b | pop ebx // 83c40c | add esp, 0xc $sequence_9 = { 012e 885c240a e9???????? 84db 0f8434020000 } // n = 5, score = 300 // 012e | add dword ptr [esi], ebp // 885c240a | mov byte ptr [esp + 0xa], bl // e9???????? | // 84db | test bl, bl // 0f8434020000 | je 0x23a $sequence_10 = { 5f 5e 8990b8010000 8bc5 } // n = 4, score = 300 // 5f | pop edi // 5e | pop esi // 8990b8010000 | mov dword ptr [eax + 0x1b8], edx // 8bc5 | mov eax, ebp $sequence_11 = { 5f 5e 8990cc010000 8bc5 } // n = 4, score = 300 // 5f | pop edi // 5e | pop esi // 8990cc010000 | mov dword ptr [eax + 0x1cc], edx // 8bc5 | mov eax, ebp $sequence_12 = { 2bca 7422 49 7559 } // n = 4, score = 300 // 2bca | sub ecx, edx // 7422 | je 0x24 // 49 | dec ecx // 7559 | jne 0x5b $sequence_13 = { 012e 885c240a ebc3 80fb5d 7520 837c240c00 0f85fe020000 } // n = 7, score = 300 // 012e | add dword ptr [esi], ebp // 885c240a | mov byte ptr [esp + 0xa], bl // ebc3 | jmp 0xffffffc5 // 80fb5d | cmp bl, 0x5d // 7520 | jne 0x22 // 837c240c00 | cmp dword ptr [esp + 0xc], 0 // 0f85fe020000 | jne 0x304 $sequence_14 = { 5f 5e 8990c0010000 8bc5 } // n = 4, score = 300 // 5f | pop edi // 5e | pop esi // 8990c0010000 | mov dword ptr [eax + 0x1c0], edx // 8bc5 | mov eax, ebp $sequence_15 = { 0107 83be8800000002 8b07 0f85ad000000 83f814 } // n = 5, score = 300 // 0107 | add dword ptr [edi], eax // 83be8800000002 | cmp dword ptr [esi + 0x88], 2 // 8b07 | mov eax, dword ptr [edi] // 0f85ad000000 | jne 0xb3 // 83f814 | cmp eax, 0x14 condition: 7 of them and filesize < 999424 }
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