Actor(s): DarkHotel
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rule win_jaku_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 51 e8???????? 83c40c f6461102 7414 ff75f0 } // n = 6, score = 1500 // 51 | push ecx // e8???????? | // 83c40c | add esp, 0xc // f6461102 | test byte ptr [esi + 0x11], 2 // 7414 | je 0x16 // ff75f0 | push dword ptr [ebp - 0x10] $sequence_1 = { 234634 8b4e40 8b5644 668b6e6c } // n = 4, score = 1500 // 234634 | and eax, dword ptr [esi + 0x34] // 8b4e40 | mov ecx, dword ptr [esi + 0x40] // 8b5644 | mov edx, dword ptr [esi + 0x44] // 668b6e6c | mov bp, word ptr [esi + 0x6c] $sequence_2 = { 83c438 84c0 743d 8b45ec 3b450c 741c } // n = 6, score = 1500 // 83c438 | add esp, 0x38 // 84c0 | test al, al // 743d | je 0x3f // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 3b450c | cmp eax, dword ptr [ebp + 0xc] // 741c | je 0x1e $sequence_3 = { 7614 8b550c 0fb702 66ff4445a8 42 8d4c45a8 42 } // n = 7, score = 1500 // 7614 | jbe 0x16 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 0fb702 | movzx eax, word ptr [edx] // 66ff4445a8 | inc word ptr [ebp + eax*2 - 0x58] // 42 | inc edx // 8d4c45a8 | lea ecx, [ebp + eax*2 - 0x58] // 42 | inc edx $sequence_4 = { 53 e8???????? 2bf8 83c410 85ff 7fd7 5b } // n = 7, score = 1500 // 53 | push ebx // e8???????? | // 2bf8 | sub edi, eax // 83c410 | add esp, 0x10 // 85ff | test edi, edi // 7fd7 | jg 0xffffffd9 // 5b | pop ebx $sequence_5 = { 397508 8975ec c645f025 c645f252 } // n = 4, score = 1500 // 397508 | cmp dword ptr [ebp + 8], esi // 8975ec | mov dword ptr [ebp - 0x14], esi // c645f025 | mov byte ptr [ebp - 0x10], 0x25 // c645f252 | mov byte ptr [ebp - 0xe], 0x52 $sequence_6 = { 8b4e40 894dd0 894df0 3b4dec } // n = 4, score = 1500 // 8b4e40 | mov ecx, dword ptr [esi + 0x40] // 894dd0 | mov dword ptr [ebp - 0x30], ecx // 894df0 | mov dword ptr [ebp - 0x10], ecx // 3b4dec | cmp ecx, dword ptr [ebp - 0x14] $sequence_7 = { 894d1c 8acb 2a4dfc 884d11 8b4d1c 668b11 0fb7ca } // n = 7, score = 1500 // 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 // 8b4d1c | mov ecx, dword ptr [ebp + 0x1c] // 668b11 | mov dx, word ptr [ecx] // 0fb7ca | movzx ecx, dx $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 = { 7507 b800308000 eb02 33c0 } // n = 4, score = 500 // 7507 | jne 9 // b800308000 | mov eax, 0x803000 // eb02 | jmp 4 // 33c0 | xor eax, eax $sequence_11 = { 53 68000000a0 6a03 53 } // n = 4, score = 500 // 53 | push ebx // 68000000a0 | push 0xa0000000 // 6a03 | push 3 // 53 | push ebx $sequence_12 = { 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_13 = { 7508 83c8ff e9???????? 8b839f830000 } // n = 4, score = 500 // 7508 | jne 0xa // 83c8ff | or eax, 0xffffffff // e9???????? | // 8b839f830000 | mov eax, dword ptr [ebx + 0x839f] $sequence_14 = { 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_15 = { 75dd 57 e8???????? 59 } // n = 4, score = 500 // 75dd | jne 0xffffffdf // 57 | push edi // e8???????? | // 59 | pop ecx $sequence_16 = { 55 56 57 6880020000 } // n = 4, score = 500 // 55 | push ebp // 56 | push esi // 57 | push edi // 6880020000 | push 0x280 $sequence_17 = { e8???????? 59 eb57 53 } // n = 4, score = 400 // e8???????? | // 59 | pop ecx // eb57 | jmp 0x59 // 53 | push ebx $sequence_18 = { 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_19 = { 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_20 = { 56 e8???????? 59 8b4620 } // n = 4, score = 400 // 56 | push esi // e8???????? | // 59 | pop ecx // 8b4620 | mov eax, dword ptr [esi + 0x20] $sequence_21 = { 50 e8???????? 59 8b4e2c } // n = 4, score = 400 // 50 | push eax // e8???????? | // 59 | pop ecx // 8b4e2c | mov ecx, dword ptr [esi + 0x2c] $sequence_22 = { 85f6 0f849d000000 8d54241c 8d442420 52 6a04 } // n = 6, score = 400 // 85f6 | test esi, esi // 0f849d000000 | je 0xa3 // 8d54241c | lea edx, [esp + 0x1c] // 8d442420 | lea eax, [esp + 0x20] // 52 | push edx // 6a04 | push 4 $sequence_23 = { 40 99 2bc2 d1f8 ff45fc 6689864d720000 668b01 } // n = 7, score = 300 // 40 | inc eax // 99 | cdq // 2bc2 | sub eax, edx // d1f8 | sar eax, 1 // ff45fc | inc dword ptr [ebp - 4] // 6689864d720000 | mov word ptr [esi + 0x724d], ax // 668b01 | mov ax, word ptr [ecx] $sequence_24 = { 85c0 7539 ff15???????? 3d882f0000 } // n = 4, score = 300 // 85c0 | test eax, eax // 7539 | jne 0x3b // ff15???????? | // 3d882f0000 | cmp eax, 0x2f88 $sequence_25 = { 56 57 8965f0 8b7d24 33db 895dfc } // n = 6, score = 300 // 56 | push esi // 57 | push edi // 8965f0 | mov dword ptr [ebp - 0x10], esp // 8b7d24 | mov edi, dword ptr [ebp + 0x24] // 33db | xor ebx, ebx // 895dfc | mov dword ptr [ebp - 4], ebx $sequence_26 = { 0fb79e73830000 eb15 e8???????? 660145fc 0fb745fc } // n = 5, score = 300 // 0fb79e73830000 | movzx ebx, word ptr [esi + 0x8373] // eb15 | jmp 0x17 // e8???????? | // 660145fc | add word ptr [ebp - 4], ax // 0fb745fc | movzx eax, word ptr [ebp - 4] $sequence_27 = { 59 ff431c 66c74310a401 833d????????00 7512 ff05???????? } // n = 6, score = 200 // 59 | pop ecx // ff431c | inc dword ptr [ebx + 0x1c] // 66c74310a401 | mov word ptr [ebx + 0x10], 0x1a4 // 833d????????00 | // 7512 | jne 0x14 // ff05???????? | $sequence_28 = { 6a00 53 e8???????? 83c40c 33d2 8bc3 } // n = 6, score = 200 // 6a00 | push 0 // 53 | push ebx // e8???????? | // 83c40c | add esp, 0xc // 33d2 | xor edx, edx // 8bc3 | mov eax, ebx condition: 7 of them and filesize < 2220032 }
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