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rule win_solarbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { c685f0feffff05 c685f2feffff00 c685f3feffff01 8b85e4feffff 8985f4feffff } // n = 5, score = 300 // c685f0feffff05 | mov byte ptr [ebp - 0x110], 5 // c685f2feffff00 | mov byte ptr [ebp - 0x10e], 0 // c685f3feffff01 | mov byte ptr [ebp - 0x10d], 1 // 8b85e4feffff | mov eax, dword ptr [ebp - 0x11c] // 8985f4feffff | mov dword ptr [ebp - 0x10c], eax $sequence_1 = { 8945fc 8b7d14 8b4518 8945f4 8b451c c745ec00000000 6a00 } // n = 7, score = 300 // 8945fc | mov dword ptr [ebp - 4], eax // 8b7d14 | mov edi, dword ptr [ebp + 0x14] // 8b4518 | mov eax, dword ptr [ebp + 0x18] // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b451c | mov eax, dword ptr [ebp + 0x1c] // c745ec00000000 | mov dword ptr [ebp - 0x14], 0 // 6a00 | push 0 $sequence_2 = { 85c0 762f c645c401 eb29 c645c401 eb23 6a00 } // n = 7, score = 300 // 85c0 | test eax, eax // 762f | jbe 0x31 // c645c401 | mov byte ptr [ebp - 0x3c], 1 // eb29 | jmp 0x2b // c645c401 | mov byte ptr [ebp - 0x3c], 1 // eb23 | jmp 0x25 // 6a00 | push 0 $sequence_3 = { 766f 89d8 05d0080000 89c6 56 e8???????? } // n = 6, score = 300 // 766f | jbe 0x71 // 89d8 | mov eax, ebx // 05d0080000 | add eax, 0x8d0 // 89c6 | mov esi, eax // 56 | push esi // e8???????? | $sequence_4 = { 83bdccfdffff26 7532 8b85e0fdffff 0385d0fdffff 8b38 } // n = 5, score = 300 // 83bdccfdffff26 | cmp dword ptr [ebp - 0x234], 0x26 // 7532 | jne 0x34 // 8b85e0fdffff | mov eax, dword ptr [ebp - 0x220] // 0385d0fdffff | add eax, dword ptr [ebp - 0x230] // 8b38 | mov edi, dword ptr [eax] $sequence_5 = { 0f8564010000 85ff 0f855c010000 ffb510f9ffff ffb5e8faffff e8???????? 89c7 } // n = 7, score = 300 // 0f8564010000 | jne 0x16a // 85ff | test edi, edi // 0f855c010000 | jne 0x162 // ffb510f9ffff | push dword ptr [ebp - 0x6f0] // ffb5e8faffff | push dword ptr [ebp - 0x518] // e8???????? | // 89c7 | mov edi, eax $sequence_6 = { e8???????? 85f6 7512 8b85e0fdffff 0385d0fdffff } // n = 5, score = 300 // e8???????? | // 85f6 | test esi, esi // 7512 | jne 0x14 // 8b85e0fdffff | mov eax, dword ptr [ebp - 0x220] // 0385d0fdffff | add eax, dword ptr [ebp - 0x230] $sequence_7 = { 8b7d0c 8b5d10 e8???????? 89c2 b000 6a00 6a00 } // n = 7, score = 300 // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 8b5d10 | mov ebx, dword ptr [ebp + 0x10] // e8???????? | // 89c2 | mov edx, eax // b000 | mov al, 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_8 = { 31c2 81e2ff000000 89d6 89c2 c1ea08 81e2ffffff00 } // n = 6, score = 300 // 31c2 | xor edx, eax // 81e2ff000000 | and edx, 0xff // 89d6 | mov esi, edx // 89c2 | mov edx, eax // c1ea08 | shr edx, 8 // 81e2ffffff00 | and edx, 0xffffff $sequence_9 = { 0f8618010000 6808020000 8d85f4fdffff 50 } // n = 4, score = 300 // 0f8618010000 | jbe 0x11e // 6808020000 | push 0x208 // 8d85f4fdffff | lea eax, [ebp - 0x20c] // 50 | push eax condition: 7 of them and filesize < 204800 }
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