Actor(s): Lazarus Group
There is no description at this point.
rule win_joanap_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 8d942433010000 52 56 ffd7 85c0 a3???????? } // n = 6, score = 100 // 8d942433010000 | lea edx, [esp + 0x133] // 52 | push edx // 56 | push esi // ffd7 | call edi // 85c0 | test eax, eax // a3???????? | $sequence_1 = { 83f8ff 0f8496000000 6683bc245810000000 0f8587000000 8bde 8b942454100000 c1e305 } // n = 7, score = 100 // 83f8ff | cmp eax, -1 // 0f8496000000 | je 0x9c // 6683bc245810000000 | cmp word ptr [esp + 0x1058], 0 // 0f8587000000 | jne 0x8d // 8bde | mov ebx, esi // 8b942454100000 | mov edx, dword ptr [esp + 0x1054] // c1e305 | shl ebx, 5 $sequence_2 = { 5d 5b 81c44c200000 c3 8b7c2428 8d4c2420 51 } // n = 7, score = 100 // 5d | pop ebp // 5b | pop ebx // 81c44c200000 | add esp, 0x204c // c3 | ret // 8b7c2428 | mov edi, dword ptr [esp + 0x28] // 8d4c2420 | lea ecx, [esp + 0x20] // 51 | push ecx $sequence_3 = { 6820bf0200 8d842488010000 8b5120 6a04 50 56 89942494010000 } // n = 7, score = 100 // 6820bf0200 | push 0x2bf20 // 8d842488010000 | lea eax, [esp + 0x188] // 8b5120 | mov edx, dword ptr [ecx + 0x20] // 6a04 | push 4 // 50 | push eax // 56 | push esi // 89942494010000 | mov dword ptr [esp + 0x194], edx $sequence_4 = { 6820bf0200 8d54245c 6a08 52 53 89442468 894c246c } // n = 7, score = 100 // 6820bf0200 | push 0x2bf20 // 8d54245c | lea edx, [esp + 0x5c] // 6a08 | push 8 // 52 | push edx // 53 | push ebx // 89442468 | mov dword ptr [esp + 0x68], eax // 894c246c | mov dword ptr [esp + 0x6c], ecx $sequence_5 = { 8d0440 83c408 c1e003 8b54242c 8d8898d72d00 89a898d72d00 897904 } // n = 7, score = 100 // 8d0440 | lea eax, [eax + eax*2] // 83c408 | add esp, 8 // c1e003 | shl eax, 3 // 8b54242c | mov edx, dword ptr [esp + 0x2c] // 8d8898d72d00 | lea ecx, [eax + 0x2dd798] // 89a898d72d00 | mov dword ptr [eax + 0x2dd798], ebp // 897904 | mov dword ptr [ecx + 4], edi $sequence_6 = { 0f85d9020000 8b442418 85c0 0f86f4010000 6681fb0640 7570 } // n = 6, score = 100 // 0f85d9020000 | jne 0x2df // 8b442418 | mov eax, dword ptr [esp + 0x18] // 85c0 | test eax, eax // 0f86f4010000 | jbe 0x1fa // 6681fb0640 | cmp bx, 0x4006 // 7570 | jne 0x72 $sequence_7 = { 83c404 eb58 8d4e03 51 e8???????? 83c404 eb4a } // n = 7, score = 100 // 83c404 | add esp, 4 // eb58 | jmp 0x5a // 8d4e03 | lea ecx, [esi + 3] // 51 | push ecx // e8???????? | // 83c404 | add esp, 4 // eb4a | jmp 0x4c $sequence_8 = { ff15???????? 85c0 0f84cf000000 8b4c2420 51 6a01 68ff0f1f00 } // n = 7, score = 100 // ff15???????? | // 85c0 | test eax, eax // 0f84cf000000 | je 0xd5 // 8b4c2420 | mov ecx, dword ptr [esp + 0x20] // 51 | push ecx // 6a01 | push 1 // 68ff0f1f00 | push 0x1f0fff $sequence_9 = { 0bc0 5b 81c470210000 c3 6a01 6820bf0200 8d8c2488010000 } // n = 7, score = 100 // 0bc0 | or eax, eax // 5b | pop ebx // 81c470210000 | add esp, 0x2170 // c3 | ret // 6a01 | push 1 // 6820bf0200 | push 0x2bf20 // 8d8c2488010000 | lea ecx, [esp + 0x188] condition: 7 of them and filesize < 270336 }
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