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rule win_solarbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.solarbot." 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.solarbot" 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 = { 0f8407feffff bb01000000 4b 90 43 8b854cfeffff } // n = 6, score = 300 // 0f8407feffff | je 0xfffffe0d // bb01000000 | mov ebx, 1 // 4b | dec ebx // 90 | nop // 43 | inc ebx // 8b854cfeffff | mov eax, dword ptr [ebp - 0x1b4] $sequence_1 = { 50 8d8500fcffff 50 6a00 } // n = 4, score = 300 // 50 | push eax // 8d8500fcffff | lea eax, [ebp - 0x400] // 50 | push eax // 6a00 | push 0 $sequence_2 = { 85db 7463 ff75f8 e8???????? 84c0 7457 } // n = 6, score = 300 // 85db | test ebx, ebx // 7463 | je 0x65 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 84c0 | test al, al // 7457 | je 0x59 $sequence_3 = { 8d85f4fdffff 50 e8???????? 6a0c 8d85e8fdffff 50 e8???????? } // n = 7, score = 300 // 8d85f4fdffff | lea eax, [ebp - 0x20c] // 50 | push eax // e8???????? | // 6a0c | push 0xc // 8d85e8fdffff | lea eax, [ebp - 0x218] // 50 | push eax // e8???????? | $sequence_4 = { 50 e8???????? 680c010000 8d85f4faffff } // n = 4, score = 300 // 50 | push eax // e8???????? | // 680c010000 | push 0x10c // 8d85f4faffff | lea eax, [ebp - 0x50c] $sequence_5 = { 8b4508 8945cc 8b7d0c 8b4510 } // n = 4, score = 300 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8945cc | mov dword ptr [ebp - 0x34], eax // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 8b4510 | mov eax, dword ptr [ebp + 0x10] $sequence_6 = { 53 e8???????? 83fe0c 7509 ff75f0 } // n = 5, score = 300 // 53 | push ebx // e8???????? | // 83fe0c | cmp esi, 0xc // 7509 | jne 0xb // ff75f0 | push dword ptr [ebp - 0x10] $sequence_7 = { 85c0 0f847d000000 ff75f4 e8???????? } // n = 4, score = 300 // 85c0 | test eax, eax // 0f847d000000 | je 0x83 // ff75f4 | push dword ptr [ebp - 0xc] // e8???????? | $sequence_8 = { c645c401 eb23 6a00 6a00 6a00 } // n = 5, score = 300 // c645c401 | mov byte ptr [ebp - 0x3c], 1 // eb23 | jmp 0x25 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_9 = { 83c040 8985e4fdffff 8b85e0fdffff 0385d0fdffff 8b583c 83bdccfdffff0c } // n = 6, score = 300 // 83c040 | add eax, 0x40 // 8985e4fdffff | mov dword ptr [ebp - 0x21c], eax // 8b85e0fdffff | mov eax, dword ptr [ebp - 0x220] // 0385d0fdffff | add eax, dword ptr [ebp - 0x230] // 8b583c | mov ebx, dword ptr [eax + 0x3c] // 83bdccfdffff0c | cmp dword ptr [ebp - 0x234], 0xc condition: 7 of them and filesize < 204800 }
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