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 = "2022-11-21" version = "1" description = "Detects win.korlia." 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.korlia" malpedia_rule_date = "20221118" malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af" malpedia_version = "20221125" 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 = 2700 // 6a32 | push 0x32 // 50 | push eax // ff15???????? | // 85c0 | test eax, eax $sequence_1 = { 6a00 ffd6 ff15???????? 8bf8 b83bd4b531 f7ef c1fa18 } // n = 7, score = 2600 // 6a00 | push 0 // ffd6 | call esi // ff15???????? | // 8bf8 | mov edi, eax // b83bd4b531 | mov eax, 0x31b5d43b // f7ef | imul edi // c1fa18 | sar edx, 0x18 $sequence_2 = { c645e401 c745fc00000000 52 51 53 } // n = 5, score = 2600 // c645e401 | mov byte ptr [ebp - 0x1c], 1 // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 52 | push edx // 51 | push ecx // 53 | push ebx $sequence_3 = { 8bc7 b9005c2605 99 f7f9 b859be904a } // n = 5, score = 2600 // 8bc7 | mov eax, edi // b9005c2605 | mov ecx, 0x5265c00 // 99 | cdq // f7f9 | idiv ecx // b859be904a | mov eax, 0x4a90be59 $sequence_4 = { 6aff 53 6a00 6a00 ffd6 ff15???????? } // n = 6, score = 2600 // 6aff | push -1 // 53 | push ebx // 6a00 | push 0 // 6a00 | push 0 // ffd6 | call esi // ff15???????? | $sequence_5 = { 59 5a c745fcffffffff 8a45e4 8b4df0 64890d00000000 5f } // n = 7, score = 2600 // 59 | pop ecx // 5a | pop edx // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff // 8a45e4 | mov al, byte ptr [ebp - 0x1c] // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 64890d00000000 | mov dword ptr fs:[0], ecx // 5f | pop edi $sequence_6 = { 83c9ff 33c0 f2ae f7d1 49 83f90f 7604 } // n = 7, score = 2600 // 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 // 7604 | jbe 6 $sequence_7 = { 81fb68584d56 0f9445e4 5b 59 5a c745fcffffffff } // n = 6, score = 2600 // 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_8 = { 6a01 53 53 53 51 ff15???????? } // n = 6, score = 2300 // 6a01 | push 1 // 53 | push ebx // 53 | push ebx // 53 | push ebx // 51 | push ecx // ff15???????? | $sequence_9 = { e8???????? 83c410 85c0 7f14 } // n = 4, score = 1700 // e8???????? | // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 7f14 | jg 0x16 $sequence_10 = { 8b65e8 ff7588 ff15???????? 833d????????ff 750c } // n = 5, score = 700 // 8b65e8 | mov esp, dword ptr [ebp - 0x18] // ff7588 | push dword ptr [ebp - 0x78] // ff15???????? | // 833d????????ff | // 750c | jne 0xe $sequence_11 = { ff742410 e8???????? c21000 e8???????? 8a4c2404 6a01 } // n = 6, score = 700 // ff742410 | push dword ptr [esp + 0x10] // e8???????? | // c21000 | ret 0x10 // e8???????? | // 8a4c2404 | mov cl, byte ptr [esp + 4] // 6a01 | push 1 $sequence_12 = { e8???????? 8a4c2404 6a01 884814 8b4c240c 898840200000 } // n = 6, score = 700 // e8???????? | // 8a4c2404 | mov cl, byte ptr [esp + 4] // 6a01 | push 1 // 884814 | mov byte ptr [eax + 0x14], cl // 8b4c240c | mov ecx, dword ptr [esp + 0xc] // 898840200000 | mov dword ptr [eax + 0x2040], ecx $sequence_13 = { 884814 8b4c240c 898840200000 58 c20800 e9???????? } // n = 6, score = 700 // 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???????? | $sequence_14 = { f2ae f7d1 2bf9 6810270000 } // n = 4, score = 700 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 2bf9 | sub edi, ecx // 6810270000 | push 0x2710 $sequence_15 = { 6a00 680030c800 6a00 6a00 68???????? } // n = 5, score = 500 // 6a00 | push 0 // 680030c800 | push 0xc83000 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | $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 = { b8447c0000 e8???????? 53 56 57 } // n = 5, score = 500 // b8447c0000 | mov eax, 0x7c44 // e8???????? | // 53 | push ebx // 56 | push esi // 57 | push edi $sequence_18 = { 8d442444 894d00 8b542438 83c504 50 895500 83c504 } // n = 7, score = 500 // 8d442444 | lea eax, [esp + 0x44] // 894d00 | mov dword ptr [ebp], ecx // 8b542438 | mov edx, dword ptr [esp + 0x38] // 83c504 | add ebp, 4 // 50 | push eax // 895500 | mov dword ptr [ebp], edx // 83c504 | add ebp, 4 $sequence_19 = { ffd6 8d44240c 6804010000 50 } // n = 4, score = 400 // ffd6 | call esi // 8d44240c | lea eax, [esp + 0xc] // 6804010000 | push 0x104 // 50 | push eax $sequence_20 = { 750c ff15???????? 53 e9???????? } // n = 4, score = 400 // 750c | jne 0xe // ff15???????? | // 53 | push ebx // e9???????? | $sequence_21 = { 51 ff15???????? a1???????? b981000000 } // n = 4, score = 400 // 51 | push ecx // ff15???????? | // a1???????? | // b981000000 | mov ecx, 0x81 $sequence_22 = { 6a00 6880000000 6800000400 8bce } // n = 4, score = 400 // 6a00 | push 0 // 6880000000 | push 0x80 // 6800000400 | push 0x40000 // 8bce | mov ecx, esi $sequence_23 = { 3bc3 57 740b 8b35???????? 50 ffd6 } // n = 6, score = 300 // 3bc3 | cmp eax, ebx // 57 | push edi // 740b | je 0xd // 8b35???????? | // 50 | push eax // ffd6 | call esi $sequence_24 = { 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_25 = { 33c0 8dbc245e020000 66899c245c020000 f3ab } // n = 4, score = 300 // 33c0 | xor eax, eax // 8dbc245e020000 | lea edi, [esp + 0x25e] // 66899c245c020000 | mov word ptr [esp + 0x25c], bx // f3ab | rep stosd dword ptr es:[edi], eax $sequence_26 = { ff15???????? 50 ff15???????? 68d0070000 ff15???????? } // n = 5, score = 300 // ff15???????? | // 50 | push eax // ff15???????? | // 68d0070000 | push 0x7d0 // ff15???????? | $sequence_27 = { 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_28 = { 68???????? 68???????? c785e4edffff0c000000 c785e8edffff00000000 } // n = 4, score = 100 // 68???????? | // 68???????? | // c785e4edffff0c000000 | mov dword ptr [ebp - 0x121c], 0xc // c785e8edffff00000000 | mov dword ptr [ebp - 0x1218], 0 $sequence_29 = { 8b54241c 83c404 52 ff15???????? 5f 5e 5d } // n = 7, score = 100 // 8b54241c | mov edx, dword ptr [esp + 0x1c] // 83c404 | add esp, 4 // 52 | push edx // ff15???????? | // 5f | pop edi // 5e | pop esi // 5d | pop ebp $sequence_30 = { 880a 3d80000000 7ce0 33f6 } // n = 4, score = 100 // 880a | mov byte ptr [edx], cl // 3d80000000 | cmp eax, 0x80 // 7ce0 | jl 0xffffffe2 // 33f6 | xor esi, esi $sequence_31 = { 8bec b84c7c0000 e8???????? a1???????? 33c5 8945fc } // n = 6, score = 100 // 8bec | mov ebp, esp // b84c7c0000 | mov eax, 0x7c4c // e8???????? | // a1???????? | // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax $sequence_32 = { 53 55 8bac2440540000 56 57 } // n = 5, score = 100 // 53 | push ebx // 55 | push ebp // 8bac2440540000 | mov ebp, dword ptr [esp + 0x5440] // 56 | push esi // 57 | push edi $sequence_33 = { 51 50 e8???????? 56 83ec0c e8???????? 8b4dfc } // n = 7, score = 100 // 51 | push ecx // 50 | push eax // e8???????? | // 56 | push esi // 83ec0c | sub esp, 0xc // e8???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_34 = { ffd6 68???????? ff7724 894710 ffd6 68???????? ff7724 } // n = 7, score = 100 // ffd6 | call esi // 68???????? | // ff7724 | push dword ptr [edi + 0x24] // 894710 | mov dword ptr [edi + 0x10], eax // ffd6 | call esi // 68???????? | // ff7724 | push dword ptr [edi + 0x24] $sequence_35 = { 53 55 57 8b5801 8d6801 83c504 c744240c01000000 } // n = 7, score = 100 // 53 | push ebx // 55 | push ebp // 57 | push edi // 8b5801 | mov ebx, dword ptr [eax + 1] // 8d6801 | lea ebp, [eax + 1] // 83c504 | add ebp, 4 // c744240c01000000 | mov dword ptr [esp + 0xc], 1 $sequence_36 = { 68???????? ff75fc ffd6 85c0 0f85d2000000 8d45f8 50 } // n = 7, score = 100 // 68???????? | // ff75fc | push dword ptr [ebp - 4] // ffd6 | call esi // 85c0 | test eax, eax // 0f85d2000000 | jne 0xd8 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax condition: 7 of them and filesize < 263168 }
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) }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below.
Please propose all changes regarding references on the Malpedia library page
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY