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rule win_thanatos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.thanatos." 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" 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 = { 6a19 57 8b3d???????? ffd7 8b35???????? 50 ffd6 } // n = 7, score = 500 // 6a19 | push 0x19 // 57 | push edi // 8b3d???????? | // ffd7 | call edi // 8b35???????? | // 50 | push eax // ffd6 | call esi $sequence_1 = { 8b4d24 7403 83c108 f6462810 } // n = 4, score = 500 // 8b4d24 | mov ecx, dword ptr [ebp + 0x24] // 7403 | je 5 // 83c108 | add ecx, 8 // f6462810 | test byte ptr [esi + 0x28], 0x10 $sequence_2 = { 8bf2 8d85d8f2ffff 50 ba14000000 89b5d4f2ffff c785d0f2ffff00000000 e8???????? } // n = 7, score = 500 // 8bf2 | mov esi, edx // 8d85d8f2ffff | lea eax, [ebp - 0xd28] // 50 | push eax // ba14000000 | mov edx, 0x14 // 89b5d4f2ffff | mov dword ptr [ebp - 0xd2c], esi // c785d0f2ffff00000000 | mov dword ptr [ebp - 0xd30], 0 // e8???????? | $sequence_3 = { 741c 50 6a01 ba???????? b9???????? e8???????? 83c408 } // n = 7, score = 500 // 741c | je 0x1e // 50 | push eax // 6a01 | push 1 // ba???????? | // b9???????? | // e8???????? | // 83c408 | add esp, 8 $sequence_4 = { a3???????? e8???????? ba799e75a6 8bcf a3???????? e8???????? } // n = 6, score = 500 // a3???????? | // e8???????? | // ba799e75a6 | mov edx, 0xa6759e79 // 8bcf | mov ecx, edi // a3???????? | // e8???????? | $sequence_5 = { 0f845a010000 8b5d10 53 56 51 ffd0 83c40c } // n = 7, score = 500 // 0f845a010000 | je 0x160 // 8b5d10 | mov ebx, dword ptr [ebp + 0x10] // 53 | push ebx // 56 | push esi // 51 | push ecx // ffd0 | call eax // 83c40c | add esp, 0xc $sequence_6 = { 51 e9???????? 8b4dfc 5f 5e 33cd } // n = 6, score = 500 // 51 | push ecx // e9???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 5f | pop edi // 5e | pop esi // 33cd | xor ecx, ebp $sequence_7 = { f6c101 7414 8b4df4 81c900000002 894e04 } // n = 5, score = 500 // f6c101 | test cl, 1 // 7414 | je 0x16 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 81c900000002 | or ecx, 0x2000000 // 894e04 | mov dword ptr [esi + 4], ecx $sequence_8 = { 0f841b010000 6a00 6a00 6a00 } // n = 4, score = 500 // 0f841b010000 | je 0x121 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_9 = { 68???????? 46 8a4415f4 3086a35b0210 ff15???????? 3bf0 7ce1 } // n = 7, score = 500 // 68???????? | // 46 | inc esi // 8a4415f4 | mov al, byte ptr [ebp + edx - 0xc] // 3086a35b0210 | xor byte ptr [esi + 0x10025ba3], al // ff15???????? | // 3bf0 | cmp esi, eax // 7ce1 | jl 0xffffffe3 condition: 7 of them and filesize < 1810432 }
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