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rule win_thanatos_ransom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.thanatos_ransom." 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.thanatos_ransom" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 50 ff75e0 e8???????? 8b4df8 8bc7 5f 33cd } // n = 7, score = 100 // 50 | push eax // ff75e0 | push dword ptr [ebp - 0x20] // e8???????? | // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8bc7 | mov eax, edi // 5f | pop edi // 33cd | xor ecx, ebp $sequence_1 = { 8b00 8bc8 e8???????? c645fc0a } // n = 4, score = 100 // 8b00 | mov eax, dword ptr [eax] // 8bc8 | mov ecx, eax // e8???????? | // c645fc0a | mov byte ptr [ebp - 4], 0xa $sequence_2 = { 50 e8???????? 56 8bd0 c645fc04 } // n = 5, score = 100 // 50 | push eax // e8???????? | // 56 | push esi // 8bd0 | mov edx, eax // c645fc04 | mov byte ptr [ebp - 4], 4 $sequence_3 = { 83c404 c60300 ff15???????? 50 e8???????? be14000000 } // n = 6, score = 100 // 83c404 | add esp, 4 // c60300 | mov byte ptr [ebx], 0 // ff15???????? | // 50 | push eax // e8???????? | // be14000000 | mov esi, 0x14 $sequence_4 = { c745500f000000 c7454c00000000 c6453c00 83f810 7242 8b4d54 } // n = 6, score = 100 // c745500f000000 | mov dword ptr [ebp + 0x50], 0xf // c7454c00000000 | mov dword ptr [ebp + 0x4c], 0 // c6453c00 | mov byte ptr [ebp + 0x3c], 0 // 83f810 | cmp eax, 0x10 // 7242 | jb 0x44 // 8b4d54 | mov ecx, dword ptr [ebp + 0x54] $sequence_5 = { 88441de8 43 8975e0 83fb04 757c 33f6 8a4435e8 } // n = 7, score = 100 // 88441de8 | mov byte ptr [ebp + ebx - 0x18], al // 43 | inc ebx // 8975e0 | mov dword ptr [ebp - 0x20], esi // 83fb04 | cmp ebx, 4 // 757c | jne 0x7e // 33f6 | xor esi, esi // 8a4435e8 | mov al, byte ptr [ebp + esi - 0x18] $sequence_6 = { 8b0c85e0774300 8a06 46 8844392c 2bf2 eb14 } // n = 6, score = 100 // 8b0c85e0774300 | mov ecx, dword ptr [eax*4 + 0x4377e0] // 8a06 | mov al, byte ptr [esi] // 46 | inc esi // 8844392c | mov byte ptr [ecx + edi + 0x2c], al // 2bf2 | sub esi, edx // eb14 | jmp 0x16 $sequence_7 = { 0f8580000000 8b4508 dd00 ebc6 c745e0a0bd4200 e9???????? } // n = 6, score = 100 // 0f8580000000 | jne 0x86 // 8b4508 | mov eax, dword ptr [ebp + 8] // dd00 | fld qword ptr [eax] // ebc6 | jmp 0xffffffc8 // c745e0a0bd4200 | mov dword ptr [ebp - 0x20], 0x42bda0 // e9???????? | $sequence_8 = { 40 8d4de0 50 ff75e0 e8???????? 8b4df8 } // n = 6, score = 100 // 40 | inc eax // 8d4de0 | lea ecx, [ebp - 0x20] // 50 | push eax // ff75e0 | push dword ptr [ebp - 0x20] // e8???????? | // 8b4df8 | mov ecx, dword ptr [ebp - 8] $sequence_9 = { e8???????? c70021000000 e9???????? 894ddc c745e034bf4200 e9???????? c745e030bf4200 } // n = 7, score = 100 // e8???????? | // c70021000000 | mov dword ptr [eax], 0x21 // e9???????? | // 894ddc | mov dword ptr [ebp - 0x24], ecx // c745e034bf4200 | mov dword ptr [ebp - 0x20], 0x42bf34 // e9???????? | // c745e030bf4200 | mov dword ptr [ebp - 0x20], 0x42bf30 condition: 7 of them and filesize < 516096 }
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