Actor(s): Lazarus Group
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rule win_joanap_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.joanap." 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.joanap" 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 = { 7cda 8bc7 5f ddd8 5e c3 5f } // n = 7, score = 100 // 7cda | jl 0xffffffdc // 8bc7 | mov eax, edi // 5f | pop edi // ddd8 | fstp st(0) // 5e | pop esi // c3 | ret // 5f | pop edi $sequence_1 = { f2ae f7d1 49 03eb 8d7c2906 83c9ff f2ae } // n = 7, score = 100 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 49 | dec ecx // 03eb | add ebp, ebx // 8d7c2906 | lea edi, [ecx + ebp + 6] // 83c9ff | or ecx, 0xffffffff // f2ae | repne scasb al, byte ptr es:[edi] $sequence_2 = { 51 56 c7803c05000001000000 e8???????? 83c414 83f8ff 7440 } // n = 7, score = 100 // 51 | push ecx // 56 | push esi // c7803c05000001000000 | mov dword ptr [eax + 0x53c], 1 // e8???????? | // 83c414 | add esp, 0x14 // 83f8ff | cmp eax, -1 // 7440 | je 0x42 $sequence_3 = { c3 8b5c2414 50 ff15???????? 5f 5e 8bc3 } // n = 7, score = 100 // c3 | ret // 8b5c2414 | mov ebx, dword ptr [esp + 0x14] // 50 | push eax // ff15???????? | // 5f | pop edi // 5e | pop esi // 8bc3 | mov eax, ebx $sequence_4 = { 8b44241c 50 ff15???????? 8b442420 5b 85c0 750e } // n = 7, score = 100 // 8b44241c | mov eax, dword ptr [esp + 0x1c] // 50 | push eax // ff15???????? | // 8b442420 | mov eax, dword ptr [esp + 0x20] // 5b | pop ebx // 85c0 | test eax, eax // 750e | jne 0x10 $sequence_5 = { ff15???????? 8b4c2410 6a01 6860ea0000 8d9424a0000000 } // n = 5, score = 100 // ff15???????? | // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // 6a01 | push 1 // 6860ea0000 | push 0xea60 // 8d9424a0000000 | lea edx, [esp + 0xa0] $sequence_6 = { 6683780400 7422 8b0d???????? 8b10 8911 8b5004 895104 } // n = 7, score = 100 // 6683780400 | cmp word ptr [eax + 4], 0 // 7422 | je 0x24 // 8b0d???????? | // 8b10 | mov edx, dword ptr [eax] // 8911 | mov dword ptr [ecx], edx // 8b5004 | mov edx, dword ptr [eax + 4] // 895104 | mov dword ptr [ecx + 4], edx $sequence_7 = { 52 56 ffd7 85c0 a3???????? 7533 8d8c2408010000 } // n = 7, score = 100 // 52 | push edx // 56 | push esi // ffd7 | call edi // 85c0 | test eax, eax // a3???????? | // 7533 | jne 0x35 // 8d8c2408010000 | lea ecx, [esp + 0x108] $sequence_8 = { e8???????? 6a04 6a00 68???????? 8d542440 68???????? 52 } // n = 7, score = 100 // e8???????? | // 6a04 | push 4 // 6a00 | push 0 // 68???????? | // 8d542440 | lea edx, [esp + 0x40] // 68???????? | // 52 | push edx $sequence_9 = { 55 8bec 83ec4c 56 8d45f0 57 50 } // n = 7, score = 100 // 55 | push ebp // 8bec | mov ebp, esp // 83ec4c | sub esp, 0x4c // 56 | push esi // 8d45f0 | lea eax, [ebp - 0x10] // 57 | push edi // 50 | push eax condition: 7 of them and filesize < 270336 }
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