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rule win_mutabaha_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.mutabaha." 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.mutabaha" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 766b 8d7308 6690 f60610 7406 c7060d000000 ffb598feffff } // n = 7, score = 100 // 766b | jbe 0x6d // 8d7308 | lea esi, [ebx + 8] // 6690 | nop // f60610 | test byte ptr [esi], 0x10 // 7406 | je 8 // c7060d000000 | mov dword ptr [esi], 0xd // ffb598feffff | push dword ptr [ebp - 0x168] $sequence_1 = { 69f6000031f2 2bc8 c1e910 69c197605b40 2bf0 8d0437 8b7dfc } // n = 7, score = 100 // 69f6000031f2 | imul esi, esi, 0xf2310000 // 2bc8 | sub ecx, eax // c1e910 | shr ecx, 0x10 // 69c197605b40 | imul eax, ecx, 0x405b6097 // 2bf0 | sub esi, eax // 8d0437 | lea eax, [edi + esi] // 8b7dfc | mov edi, dword ptr [ebp - 4] $sequence_2 = { 3bc8 7512 8b4d18 8bc6 890e 8b4d1c 894e04 } // n = 7, score = 100 // 3bc8 | cmp ecx, eax // 7512 | jne 0x14 // 8b4d18 | mov ecx, dword ptr [ebp + 0x18] // 8bc6 | mov eax, esi // 890e | mov dword ptr [esi], ecx // 8b4d1c | mov ecx, dword ptr [ebp + 0x1c] // 894e04 | mov dword ptr [esi + 4], ecx $sequence_3 = { 8bce e8???????? 84c0 0f84c5feffff 8b55b8 85ff 7410 } // n = 7, score = 100 // 8bce | mov ecx, esi // e8???????? | // 84c0 | test al, al // 0f84c5feffff | je 0xfffffecb // 8b55b8 | mov edx, dword ptr [ebp - 0x48] // 85ff | test edi, edi // 7410 | je 0x12 $sequence_4 = { 8d8570ffffff c645fc0f 50 8d8568ffffff 50 8d4de8 e8???????? } // n = 7, score = 100 // 8d8570ffffff | lea eax, [ebp - 0x90] // c645fc0f | mov byte ptr [ebp - 4], 0xf // 50 | push eax // 8d8568ffffff | lea eax, [ebp - 0x98] // 50 | push eax // 8d4de8 | lea ecx, [ebp - 0x18] // e8???????? | $sequence_5 = { 68ffffff7f 68???????? 51 8d8c246c060000 2bd0 8d0c41 } // n = 6, score = 100 // 68ffffff7f | push 0x7fffffff // 68???????? | // 51 | push ecx // 8d8c246c060000 | lea ecx, [esp + 0x66c] // 2bd0 | sub edx, eax // 8d0c41 | lea ecx, [ecx + eax*2] $sequence_6 = { 83bdd8fbffff08 8d8dc4fbffff ba58020000 0f438dc4fbffff e8???????? 84c0 7504 } // n = 7, score = 100 // 83bdd8fbffff08 | cmp dword ptr [ebp - 0x428], 8 // 8d8dc4fbffff | lea ecx, [ebp - 0x43c] // ba58020000 | mov edx, 0x258 // 0f438dc4fbffff | cmovae ecx, dword ptr [ebp - 0x43c] // e8???????? | // 84c0 | test al, al // 7504 | jne 6 $sequence_7 = { 8945d0 8d4598 50 8d45d0 c745c800000000 50 c645b800 } // n = 7, score = 100 // 8945d0 | mov dword ptr [ebp - 0x30], eax // 8d4598 | lea eax, [ebp - 0x68] // 50 | push eax // 8d45d0 | lea eax, [ebp - 0x30] // c745c800000000 | mov dword ptr [ebp - 0x38], 0 // 50 | push eax // c645b800 | mov byte ptr [ebp - 0x48], 0 $sequence_8 = { 8d8d00fdffff 50 ffb500fdffff e8???????? 8bbd38fdffff 8b45ec 83f808 } // n = 7, score = 100 // 8d8d00fdffff | lea ecx, [ebp - 0x300] // 50 | push eax // ffb500fdffff | push dword ptr [ebp - 0x300] // e8???????? | // 8bbd38fdffff | mov edi, dword ptr [ebp - 0x2c8] // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 83f808 | cmp eax, 8 $sequence_9 = { e9???????? 8d8d54ffffff e9???????? e8???????? c3 8b542408 8d420c } // n = 7, score = 100 // e9???????? | // 8d8d54ffffff | lea ecx, [ebp - 0xac] // e9???????? | // e8???????? | // c3 | ret // 8b542408 | mov edx, dword ptr [esp + 8] // 8d420c | lea eax, [edx + 0xc] condition: 7 of them and filesize < 1220608 }
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