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rule win_sysjoker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.sysjoker." 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.sysjoker" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { e8???????? c645fc08 8b45d0 8b48f0 85c9 740b } // n = 6, score = 100 // e8???????? | // c645fc08 | mov byte ptr [ebp - 4], 8 // 8b45d0 | mov eax, dword ptr [ebp - 0x30] // 8b48f0 | mov ecx, dword ptr [eax - 0x10] // 85c9 | test ecx, ecx // 740b | je 0xd $sequence_1 = { ff15???????? e8???????? 8bc8 85c9 0f84a7030000 8b01 8b400c } // n = 7, score = 100 // ff15???????? | // e8???????? | // 8bc8 | mov ecx, eax // 85c9 | test ecx, ecx // 0f84a7030000 | je 0x3ad // 8b01 | mov eax, dword ptr [ecx] // 8b400c | mov eax, dword ptr [eax + 0xc] $sequence_2 = { 2bc1 83f80b 0f8200020000 833d????????10 b8???????? 6a0b 0f4305???????? } // n = 7, score = 100 // 2bc1 | sub eax, ecx // 83f80b | cmp eax, 0xb // 0f8200020000 | jb 0x206 // 833d????????10 | // b8???????? | // 6a0b | push 0xb // 0f4305???????? | $sequence_3 = { 745b 8bf1 2bf0 c1fe04 56 e8???????? } // n = 6, score = 100 // 745b | je 0x5d // 8bf1 | mov esi, ecx // 2bf0 | sub esi, eax // c1fe04 | sar esi, 4 // 56 | push esi // e8???????? | $sequence_4 = { 85f6 7407 83feff 7576 eb56 8b04852ce04400 6800080000 } // n = 7, score = 100 // 85f6 | test esi, esi // 7407 | je 9 // 83feff | cmp esi, -1 // 7576 | jne 0x78 // eb56 | jmp 0x58 // 8b04852ce04400 | mov eax, dword ptr [eax*4 + 0x44e02c] // 6800080000 | push 0x800 $sequence_5 = { c645fc2c 8b7d88 8bd0 51 8bcf e8???????? c645fc2b } // n = 7, score = 100 // c645fc2c | mov byte ptr [ebp - 4], 0x2c // 8b7d88 | mov edi, dword ptr [ebp - 0x78] // 8bd0 | mov edx, eax // 51 | push ecx // 8bcf | mov ecx, edi // e8???????? | // c645fc2b | mov byte ptr [ebp - 4], 0x2b $sequence_6 = { 8bc6 8b9580feffff 83c2f0 f00fc1420c 48 85c0 } // n = 6, score = 100 // 8bc6 | mov eax, esi // 8b9580feffff | mov edx, dword ptr [ebp - 0x180] // 83c2f0 | add edx, -0x10 // f00fc1420c | lock xadd dword ptr [edx + 0xc], eax // 48 | dec eax // 85c0 | test eax, eax $sequence_7 = { ffb5dcfcffff 8d8d2cffffff e8???????? 83ce04 89b500fdffff c645fc29 8d852cffffff } // n = 7, score = 100 // ffb5dcfcffff | push dword ptr [ebp - 0x324] // 8d8d2cffffff | lea ecx, [ebp - 0xd4] // e8???????? | // 83ce04 | or esi, 4 // 89b500fdffff | mov dword ptr [ebp - 0x300], esi // c645fc29 | mov byte ptr [ebp - 4], 0x29 // 8d852cffffff | lea eax, [ebp - 0xd4] $sequence_8 = { 8bc8 8b10 ff5210 8b16 8bd8 8b07 } // n = 6, score = 100 // 8bc8 | mov ecx, eax // 8b10 | mov edx, dword ptr [eax] // ff5210 | call dword ptr [edx + 0x10] // 8b16 | mov edx, dword ptr [esi] // 8bd8 | mov ebx, eax // 8b07 | mov eax, dword ptr [edi] $sequence_9 = { 8d4db4 e8???????? 83c404 ff30 ff15???????? 8b55b4 8bc6 } // n = 7, score = 100 // 8d4db4 | lea ecx, [ebp - 0x4c] // e8???????? | // 83c404 | add esp, 4 // ff30 | push dword ptr [eax] // ff15???????? | // 8b55b4 | mov edx, dword ptr [ebp - 0x4c] // 8bc6 | mov eax, esi condition: 7 of them and filesize < 832512 }
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