Actor(s): DarkHotel
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rule win_jaku_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" version = "1" description = "Detects win.jaku." 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.jaku" malpedia_rule_date = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 6609beb8160000 8b7e08 8a9eb8160000 881c39 ff4614 } // n = 5, score = 1500 // 6609beb8160000 | or word ptr [esi + 0x16b8], di // 8b7e08 | mov edi, dword ptr [esi + 8] // 8a9eb8160000 | mov bl, byte ptr [esi + 0x16b8] // 881c39 | mov byte ptr [ecx + edi], bl // ff4614 | inc dword ptr [esi + 0x14] $sequence_1 = { 7520 f6c140 0f85c6010000 6a01 5a d3e2 0fb74df2 } // n = 7, score = 1500 // 7520 | jne 0x22 // f6c140 | test cl, 0x40 // 0f85c6010000 | jne 0x1cc // 6a01 | push 1 // 5a | pop edx // d3e2 | shl edx, cl // 0fb74df2 | movzx ecx, word ptr [ebp - 0xe] $sequence_2 = { 57 0f840d120000 8b701c 3bf2 } // n = 4, score = 1500 // 57 | push edi // 0f840d120000 | je 0x1213 // 8b701c | mov esi, dword ptr [eax + 0x1c] // 3bf2 | cmp esi, edx $sequence_3 = { 6685c9 741b 0fb7c1 8b4d1c 0fb7444588 66893441 } // n = 6, score = 1500 // 6685c9 | test cx, cx // 741b | je 0x1d // 0fb7c1 | movzx eax, cx // 8b4d1c | mov ecx, dword ptr [ebp + 0x1c] // 0fb7444588 | movzx eax, word ptr [ebp + eax*2 - 0x78] // 66893441 | mov word ptr [ecx + eax*2], si $sequence_4 = { 0f8305020000 8b4d1c 894d1c 8acb 2a4dfc 884d11 } // n = 6, score = 1500 // 0f8305020000 | jae 0x20b // 8b4d1c | mov ecx, dword ptr [ebp + 0x1c] // 894d1c | mov dword ptr [ebp + 0x1c], ecx // 8acb | mov cl, bl // 2a4dfc | sub cl, byte ptr [ebp - 4] // 884d11 | mov byte ptr [ebp + 0x11], cl $sequence_5 = { 56 8b7510 57 6a08 33c0 59 } // n = 6, score = 1500 // 56 | push esi // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 57 | push edi // 6a08 | push 8 // 33c0 | xor eax, eax // 59 | pop ecx $sequence_6 = { 85d2 0f85760c0000 eb0b 8b4620 85c0 7404 83601c00 } // n = 7, score = 1500 // 85d2 | test edx, edx // 0f85760c0000 | jne 0xc7c // eb0b | jmp 0xd // 8b4620 | mov eax, dword ptr [esi + 0x20] // 85c0 | test eax, eax // 7404 | je 6 // 83601c00 | and dword ptr [eax + 0x1c], 0 $sequence_7 = { 668b566c 33db 66891441 ff4e78 75b6 ff466c 8b466c } // n = 7, score = 1500 // 668b566c | mov dx, word ptr [esi + 0x6c] // 33db | xor ebx, ebx // 66891441 | mov word ptr [ecx + eax*2], dx // ff4e78 | dec dword ptr [esi + 0x78] // 75b6 | jne 0xffffffb8 // ff466c | inc dword ptr [esi + 0x6c] // 8b466c | mov eax, dword ptr [esi + 0x6c] $sequence_8 = { 68???????? ff15???????? c3 b8???????? e8???????? 83ec2c } // n = 6, score = 800 // 68???????? | // ff15???????? | // c3 | ret // b8???????? | // e8???????? | // 83ec2c | sub esp, 0x2c $sequence_9 = { ff742408 e8???????? c20800 8bc1 } // n = 4, score = 600 // ff742408 | push dword ptr [esp + 8] // e8???????? | // c20800 | ret 8 // 8bc1 | mov eax, ecx $sequence_10 = { 53 68000000a0 6a03 53 } // n = 4, score = 500 // 53 | push ebx // 68000000a0 | push 0xa0000000 // 6a03 | push 3 // 53 | push ebx $sequence_11 = { 7508 83c8ff e9???????? 8b839f830000 } // n = 4, score = 500 // 7508 | jne 0xa // 83c8ff | or eax, 0xffffffff // e9???????? | // 8b839f830000 | mov eax, dword ptr [ebx + 0x839f] $sequence_12 = { 5b c3 55 8bec 833d????????00 53 56 } // n = 7, score = 500 // 5b | pop ebx // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 833d????????00 | // 53 | push ebx // 56 | push esi $sequence_13 = { 7507 b800308000 eb02 33c0 } // n = 4, score = 500 // 7507 | jne 9 // b800308000 | mov eax, 0x803000 // eb02 | jmp 4 // 33c0 | xor eax, eax $sequence_14 = { 55 56 57 6880020000 } // n = 4, score = 500 // 55 | push ebp // 56 | push esi // 57 | push edi // 6880020000 | push 0x280 $sequence_15 = { 75dd 57 e8???????? 59 } // n = 4, score = 500 // 75dd | jne 0xffffffdf // 57 | push edi // e8???????? | // 59 | pop ecx $sequence_16 = { 6a01 03c3 68???????? 50 e8???????? 83c40c 85c0 } // n = 7, score = 500 // 6a01 | push 1 // 03c3 | add eax, ebx // 68???????? | // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax $sequence_17 = { 50 e8???????? 59 8b4e2c } // n = 4, score = 400 // 50 | push eax // e8???????? | // 59 | pop ecx // 8b4e2c | mov ecx, dword ptr [esi + 0x2c] $sequence_18 = { e8???????? 59 eb57 53 } // n = 4, score = 400 // e8???????? | // 59 | pop ecx // eb57 | jmp 0x59 // 53 | push ebx $sequence_19 = { 56 e8???????? 59 8b4620 } // n = 4, score = 400 // 56 | push esi // e8???????? | // 59 | pop ecx // 8b4620 | mov eax, dword ptr [esi + 0x20] $sequence_20 = { 0245fd 3245fe 8a4dff d2c8 } // n = 4, score = 400 // 0245fd | add al, byte ptr [ebp - 3] // 3245fe | xor al, byte ptr [ebp - 2] // 8a4dff | mov cl, byte ptr [ebp - 1] // d2c8 | ror al, cl $sequence_21 = { 85ed 8bf5 746e 8dbed8010000 } // n = 4, score = 400 // 85ed | test ebp, ebp // 8bf5 | mov esi, ebp // 746e | je 0x70 // 8dbed8010000 | lea edi, [esi + 0x1d8] $sequence_22 = { 016c242c 8b44242c 5f 5e 5d } // n = 5, score = 400 // 016c242c | add dword ptr [esp + 0x2c], ebp // 8b44242c | mov eax, dword ptr [esp + 0x2c] // 5f | pop edi // 5e | pop esi // 5d | pop ebp $sequence_23 = { 8b4dec 2bc8 8d5c0bff 40 8945ec } // n = 5, score = 300 // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 2bc8 | sub ecx, eax // 8d5c0bff | lea ebx, [ebx + ecx - 1] // 40 | inc eax // 8945ec | mov dword ptr [ebp - 0x14], eax $sequence_24 = { 33c9 66898875830000 889877830000 66898878830000 } // n = 4, score = 300 // 33c9 | xor ecx, ecx // 66898875830000 | mov word ptr [eax + 0x8375], cx // 889877830000 | mov byte ptr [eax + 0x8377], bl // 66898878830000 | mov word ptr [eax + 0x8378], cx $sequence_25 = { 8b4508 895dcc 895d28 7303 } // n = 4, score = 300 // 8b4508 | mov eax, dword ptr [ebp + 8] // 895dcc | mov dword ptr [ebp - 0x34], ebx // 895d28 | mov dword ptr [ebp + 0x28], ebx // 7303 | jae 5 $sequence_26 = { 66398731770000 7505 e8???????? 0fbf4508 } // n = 4, score = 300 // 66398731770000 | cmp word ptr [edi + 0x7731], ax // 7505 | jne 7 // e8???????? | // 0fbf4508 | movsx eax, word ptr [ebp + 8] $sequence_27 = { 6a00 56 53 8b03 ff502c } // n = 5, score = 200 // 6a00 | push 0 // 56 | push esi // 53 | push ebx // 8b03 | mov eax, dword ptr [ebx] // ff502c | call dword ptr [eax + 0x2c] $sequence_28 = { 59 ff431c 66c743107c02 833d????????00 } // n = 4, score = 200 // 59 | pop ecx // ff431c | inc dword ptr [ebx + 0x1c] // 66c743107c02 | mov word ptr [ebx + 0x10], 0x27c // 833d????????00 | condition: 7 of them and filesize < 2220032 }
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