Actor(s): Tonto Team
There is no description at this point.
rule win_korlia_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.korlia" 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 = { 6a32 50 ff15???????? 85c0 } // n = 4, score = 2400 // 6a32 | push 0x32 // 50 | push eax // ff15???????? | // 85c0 | test eax, eax $sequence_1 = { ed 81fb68584d56 0f9445e4 5b 59 5a c745fcffffffff } // n = 7, score = 2200 // ed | in eax, dx // 81fb68584d56 | cmp ebx, 0x564d5868 // 0f9445e4 | sete byte ptr [ebp - 0x1c] // 5b | pop ebx // 59 | pop ecx // 5a | pop edx // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff $sequence_2 = { 83c9ff 33c0 f2ae f7d1 49 83f90f } // n = 6, score = 2200 // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 49 | dec ecx // 83f90f | cmp ecx, 0xf $sequence_3 = { 85db 7410 6a28 68???????? 6aff 53 6a00 } // n = 7, score = 2200 // 85db | test ebx, ebx // 7410 | je 0x12 // 6a28 | push 0x28 // 68???????? | // 6aff | push -1 // 53 | push ebx // 6a00 | push 0 $sequence_4 = { 8bc2 c1e81f 03d0 52 68???????? 51 ffd6 } // n = 7, score = 2200 // 8bc2 | mov eax, edx // c1e81f | shr eax, 0x1f // 03d0 | add edx, eax // 52 | push edx // 68???????? | // 51 | push ecx // ffd6 | call esi $sequence_5 = { 6a00 ffd6 68???????? c705????????1c010000 ff15???????? 85c0 } // n = 6, score = 2200 // 6a00 | push 0 // ffd6 | call esi // 68???????? | // c705????????1c010000 | // ff15???????? | // 85c0 | test eax, eax $sequence_6 = { ffd6 8bc7 b980ee3600 99 f7f9 b873b2e745 } // n = 6, score = 2200 // ffd6 | call esi // 8bc7 | mov eax, edi // b980ee3600 | mov ecx, 0x36ee80 // 99 | cdq // f7f9 | idiv ecx // b873b2e745 | mov eax, 0x45e7b273 $sequence_7 = { 68???????? 68???????? ffd6 b905000000 be???????? } // n = 5, score = 2200 // 68???????? | // 68???????? | // ffd6 | call esi // b905000000 | mov ecx, 5 // be???????? | $sequence_8 = { 53 53 6a01 53 53 53 51 } // n = 7, score = 1900 // 53 | push ebx // 53 | push ebx // 6a01 | push 1 // 53 | push ebx // 53 | push ebx // 53 | push ebx // 51 | push ecx $sequence_9 = { e8???????? 83c410 85c0 7f14 } // n = 4, score = 1500 // e8???????? | // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 7f14 | jg 0x16 $sequence_10 = { 8b442404 56 6a00 6a00 6a01 } // n = 5, score = 700 // 8b442404 | mov eax, dword ptr [esp + 4] // 56 | push esi // 6a00 | push 0 // 6a00 | push 0 // 6a01 | push 1 $sequence_11 = { 6a01 6a00 6a00 6800000040 50 ff15???????? 8bf0 } // n = 7, score = 700 // 6a01 | push 1 // 6a00 | push 0 // 6a00 | push 0 // 6800000040 | push 0x40000000 // 50 | push eax // ff15???????? | // 8bf0 | mov esi, eax $sequence_12 = { f2ae f7d1 2bf9 6810270000 } // n = 4, score = 600 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 2bf9 | sub edi, ecx // 6810270000 | push 0x2710 $sequence_13 = { 7423 8b542410 8b44240c 8d4c2408 6a00 } // n = 5, score = 600 // 7423 | je 0x25 // 8b542410 | mov edx, dword ptr [esp + 0x10] // 8b44240c | mov eax, dword ptr [esp + 0xc] // 8d4c2408 | lea ecx, [esp + 8] // 6a00 | push 0 $sequence_14 = { ff15???????? 8bf0 83feff 7423 8b542410 } // n = 5, score = 600 // ff15???????? | // 8bf0 | mov esi, eax // 83feff | cmp esi, -1 // 7423 | je 0x25 // 8b542410 | mov edx, dword ptr [esp + 0x10] $sequence_15 = { 50 56 ff15???????? 56 ff15???????? b001 5e } // n = 7, score = 600 // 50 | push eax // 56 | push esi // ff15???????? | // 56 | push esi // ff15???????? | // b001 | mov al, 1 // 5e | pop esi $sequence_16 = { 8bf9 81e7ff000000 03f2 03f7 } // n = 4, score = 500 // 8bf9 | mov edi, ecx // 81e7ff000000 | and edi, 0xff // 03f2 | add esi, edx // 03f7 | add esi, edi $sequence_17 = { ff742410 e8???????? c21000 e8???????? 8a4c2404 6a01 884814 } // n = 7, score = 400 // ff742410 | push dword ptr [esp + 0x10] // e8???????? | // c21000 | ret 0x10 // e8???????? | // 8a4c2404 | mov cl, byte ptr [esp + 4] // 6a01 | push 1 // 884814 | mov byte ptr [eax + 0x14], cl $sequence_18 = { c3 8b65e8 ff7588 ff15???????? 833d????????ff } // n = 5, score = 400 // c3 | ret // 8b65e8 | mov esp, dword ptr [ebp - 0x18] // ff7588 | push dword ptr [ebp - 0x78] // ff15???????? | // 833d????????ff | $sequence_19 = { ff15???????? 833d????????ff 750c ff742404 } // n = 4, score = 400 // ff15???????? | // 833d????????ff | // 750c | jne 0xe // ff742404 | push dword ptr [esp + 4] $sequence_20 = { 884814 8b4c240c 898840200000 58 c20800 e9???????? 6800060000 } // n = 7, score = 400 // 884814 | mov byte ptr [eax + 0x14], cl // 8b4c240c | mov ecx, dword ptr [esp + 0xc] // 898840200000 | mov dword ptr [eax + 0x2040], ecx // 58 | pop eax // c20800 | ret 8 // e9???????? | // 6800060000 | push 0x600 $sequence_21 = { 5b 81c414040000 c3 56 } // n = 4, score = 400 // 5b | pop ebx // 81c414040000 | add esp, 0x414 // c3 | ret // 56 | push esi $sequence_22 = { a1???????? 3bc3 7403 50 ffd6 b912010000 } // n = 6, score = 300 // a1???????? | // 3bc3 | cmp eax, ebx // 7403 | je 5 // 50 | push eax // ffd6 | call esi // b912010000 | mov ecx, 0x112 $sequence_23 = { 68???????? 51 ff15???????? 8b54240c 8bf0 52 } // n = 6, score = 300 // 68???????? | // 51 | push ecx // ff15???????? | // 8b54240c | mov edx, dword ptr [esp + 0xc] // 8bf0 | mov esi, eax // 52 | push edx $sequence_24 = { ff15???????? 85c0 740a 56 50 ff15???????? } // n = 6, score = 300 // ff15???????? | // 85c0 | test eax, eax // 740a | je 0xc // 56 | push esi // 50 | push eax // ff15???????? | $sequence_25 = { 8b35???????? 50 ffd6 eb06 8b35???????? a1???????? 3bc3 } // n = 7, score = 300 // 8b35???????? | // 50 | push eax // ffd6 | call esi // eb06 | jmp 8 // 8b35???????? | // a1???????? | // 3bc3 | cmp eax, ebx $sequence_26 = { 5b 40 81c408010000 c3 } // n = 4, score = 300 // 5b | pop ebx // 40 | inc eax // 81c408010000 | add esp, 0x108 // c3 | ret $sequence_27 = { 50 e8???????? d1e0 8bc8 894500 83c504 } // n = 6, score = 300 // 50 | push eax // e8???????? | // d1e0 | shl eax, 1 // 8bc8 | mov ecx, eax // 894500 | mov dword ptr [ebp], eax // 83c504 | add ebp, 4 $sequence_28 = { b90f000000 33c0 8d7c2425 c68424080a000000 f3ab 66ab } // n = 6, score = 300 // b90f000000 | mov ecx, 0xf // 33c0 | xor eax, eax // 8d7c2425 | lea edi, [esp + 0x25] // c68424080a000000 | mov byte ptr [esp + 0xa08], 0 // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax $sequence_29 = { 56 3bc3 57 740b 8b35???????? 50 } // n = 6, score = 300 // 56 | push esi // 3bc3 | cmp eax, ebx // 57 | push edi // 740b | je 0xd // 8b35???????? | // 50 | push eax $sequence_30 = { 8d4c2410 6804010000 51 aa } // n = 4, score = 300 // 8d4c2410 | lea ecx, [esp + 0x10] // 6804010000 | push 0x104 // 51 | push ecx // aa | stosb byte ptr es:[edi], al $sequence_31 = { 1bc0 5e 24fe 5b 40 } // n = 5, score = 300 // 1bc0 | sbb eax, eax // 5e | pop esi // 24fe | and al, 0xfe // 5b | pop ebx // 40 | inc eax $sequence_32 = { 8b44240c 8d4c2414 8d542418 51 52 6a00 6a00 } // n = 7, score = 300 // 8b44240c | mov eax, dword ptr [esp + 0xc] // 8d4c2414 | lea ecx, [esp + 0x14] // 8d542418 | lea edx, [esp + 0x18] // 51 | push ecx // 52 | push edx // 6a00 | push 0 // 6a00 | push 0 $sequence_33 = { ff15???????? 50 ff15???????? 68d0070000 ff15???????? } // n = 5, score = 300 // ff15???????? | // 50 | push eax // ff15???????? | // 68d0070000 | push 0x7d0 // ff15???????? | $sequence_34 = { 57 8d4c2414 e8???????? 33db b90b000000 33c0 8d7c2455 } // n = 7, score = 300 // 57 | push edi // 8d4c2414 | lea ecx, [esp + 0x14] // e8???????? | // 33db | xor ebx, ebx // b90b000000 | mov ecx, 0xb // 33c0 | xor eax, eax // 8d7c2455 | lea edi, [esp + 0x55] $sequence_35 = { e8???????? 6a00 6a00 8d542414 } // n = 4, score = 300 // e8???????? | // 6a00 | push 0 // 6a00 | push 0 // 8d542414 | lea edx, [esp + 0x14] $sequence_36 = { ffd6 8d44240c 6804010000 50 } // n = 4, score = 300 // ffd6 | call esi // 8d44240c | lea eax, [esp + 0xc] // 6804010000 | push 0x104 // 50 | push eax $sequence_37 = { 85c0 0f8599000000 53 56 57 b940000000 8d7c2411 } // n = 7, score = 300 // 85c0 | test eax, eax // 0f8599000000 | jne 0x9f // 53 | push ebx // 56 | push esi // 57 | push edi // b940000000 | mov ecx, 0x40 // 8d7c2411 | lea edi, [esp + 0x11] $sequence_38 = { 8d9dc4fdffff 803b00 0f84a0000000 bf???????? 83c9ff 33c0 be???????? } // n = 7, score = 100 // 8d9dc4fdffff | lea ebx, [ebp - 0x23c] // 803b00 | cmp byte ptr [ebx], 0 // 0f84a0000000 | je 0xa6 // bf???????? | // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // be???????? | $sequence_39 = { ffd3 8b4df4 8bc6 5f 5e 64890d00000000 5b } // n = 7, score = 100 // ffd3 | call ebx // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 8bc6 | mov eax, esi // 5f | pop edi // 5e | pop esi // 64890d00000000 | mov dword ptr fs:[0], ecx // 5b | pop ebx condition: 7 of them and filesize < 163840 }
rule win_korlia_w0 { meta: author = "Nick Hoffman" company = "CBTS - ACS" information = "korlia malware found in apt dump" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.korlia" malpedia_version = "20180125" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" //case a //b2 1f mov dl, 0x1f ; mov key (wildcard) // ----------------- //8A 86 98 40 00 71 mov al, byte ptr url[esi] //BF 98 40 00 71 mov edi, offset url //32 C2 xor al, dl //83 C9 FF or ecx, 0FFFFFFFFh //88 86 98 40 00 71 mov byte ptr url[esi], al //33 C0 xor eax, eax //46 inc esi //F2 AE repne scasb //F7 D1 not ecx //49 dec ecx //3B F1 cmp esi, ecx //72 DE jb short loc_71001DE0 //case b (variant of loop a) //8A 8A 28 50 40 00 mov cl, byte_405028[edx] //BF 28 50 40 00 mov edi, offset byte_405028 //32 CB xor cl, bl //33 C0 xor eax, eax //88 8A 28 50 40 00 mov byte_405028[edx], cl //83 C9 FF or ecx, 0FFFFFFFFh //42 inc edx //F2 AE repne scasb //F7 D1 not ecx //49 dec ecx //3B D1 cmp edx, ecx //72 DE jb short loc_4047F2 //case c (not a variant of the above loop) //8A 0C 28 mov cl, [eax+ebp] //80 F1 28 xor cl, 28h //88 0C 28 mov [eax+ebp], cl //8B 4C 24 14 mov ecx, [esp+0D78h+var_D64] //40 inc eax //3B C1 cmp eax, ecx //7C EE jl short loc_404F1C strings: $a = {b2 ?? 8A 86 98 40 00 71 BF 98 40 00 71 32 c2 83 C9 FF 88 86 98 40 00 71 33 C0 46 F2 AE F7 D1 49 3B F1} $b = {B3 ?? ?? ?? 8A 8A 28 50 40 00 BF 28 50 40 00 32 CB 33 C0 88 8A 28 50 40 00 83 C9 FF 42 F2 AE F7 D1 49 3B D1} $c = {8A 0C 28 80 F1 ?? 88 0C 28 8B 4C 24 14 40 3B C1} $d = {00 62 69 73 6F 6E 61 6C 00} //config marker "\x00bisonal\x00" condition: any of them }
rule win_korlia_w1 { meta: author = "pinksawtooth" source = "https://github.com/nao-sec/yara_rules/blob/master/Malware/bisonal.yar" reference = "https://www.paloaltonetworks.jp/company/in-the-news/2018/unit42-bisonal-malware-used-attacks-russia-south-korea" description = "rule to detect korlia/bisonal" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.korlia" malpedia_rule_date = "20210204" malpedia_hash = "" malpedia_version = "20210204" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s1 = "akspbu.txt" ascii wide $s2 = "ks8d" ascii wide $s3 = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.1.4322" ascii wide /* bisonal_decode_jsac */ $decode = { bb bf 58 00 00 [0-2] 8d 0c 40 c1 e1 04 2b c8 8d 0c 49 8d 0c 89 8d 0c c9 8d 04 48 83 c9 ff } condition: uint16(0) == 0x5A4D and (all of ($s*) or $decode) }
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