Actor(s): GreyEnergy, TeleBots
There is no description at this point.
rule win_grey_energy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-10-07" version = "1" description = "Detects win.grey_energy." 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.grey_energy" malpedia_rule_date = "20211007" malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535" malpedia_version = "20211008" 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 = { 8945d4 e8???????? 68???????? 8945d0 } // n = 4, score = 500 // 8945d4 | mov dword ptr [ebp - 0x2c], eax // e8???????? | // 68???????? | // 8945d0 | mov dword ptr [ebp - 0x30], eax $sequence_1 = { 68???????? 8945cc e8???????? 68???????? 8945d4 } // n = 5, score = 500 // 68???????? | // 8945cc | mov dword ptr [ebp - 0x34], eax // e8???????? | // 68???????? | // 8945d4 | mov dword ptr [ebp - 0x2c], eax $sequence_2 = { 53 6800000008 57 53 53 } // n = 5, score = 500 // 53 | push ebx // 6800000008 | push 0x8000000 // 57 | push edi // 53 | push ebx // 53 | push ebx $sequence_3 = { 8b45f8 0345ec 8808 eb10 } // n = 4, score = 400 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 0345ec | add eax, dword ptr [ebp - 0x14] // 8808 | mov byte ptr [eax], cl // eb10 | jmp 0x12 $sequence_4 = { 8b4d08 0fb70c41 8b45f0 33d2 } // n = 4, score = 400 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 0fb70c41 | movzx ecx, word ptr [ecx + eax*2] // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 33d2 | xor edx, edx $sequence_5 = { 8b45ec 8b55f8 66890c42 eb14 8b45ec 8b4df8 } // n = 6, score = 400 // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8b55f8 | mov edx, dword ptr [ebp - 8] // 66890c42 | mov word ptr [edx + eax*2], cx // eb14 | jmp 0x16 // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8b4df8 | mov ecx, dword ptr [ebp - 8] $sequence_6 = { eb14 8b45ec 8b4df8 8b55f0 8b7508 668b1456 } // n = 6, score = 400 // eb14 | jmp 0x16 // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8b55f0 | mov edx, dword ptr [ebp - 0x10] // 8b7508 | mov esi, dword ptr [ebp + 8] // 668b1456 | mov dx, word ptr [esi + edx*2] $sequence_7 = { 41 48 75f9 53 ff15???????? 8b75f8 } // n = 6, score = 400 // 41 | inc ecx // 48 | dec eax // 75f9 | jne 0xfffffffb // 53 | push ebx // ff15???????? | // 8b75f8 | mov esi, dword ptr [ebp - 8] $sequence_8 = { 8945f8 837df800 7507 33c0 e9???????? c745f004000000 } // n = 6, score = 400 // 8945f8 | mov dword ptr [ebp - 8], eax // 837df800 | cmp dword ptr [ebp - 8], 0 // 7507 | jne 9 // 33c0 | xor eax, eax // e9???????? | // c745f004000000 | mov dword ptr [ebp - 0x10], 4 $sequence_9 = { 8b4508 0345f0 0fbe08 8b45f0 } // n = 4, score = 400 // 8b4508 | mov eax, dword ptr [ebp + 8] // 0345f0 | add eax, dword ptr [ebp - 0x10] // 0fbe08 | movsx ecx, byte ptr [eax] // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_10 = { 50 6a40 ff15???????? 8945f8 837df800 7507 } // n = 6, score = 400 // 50 | push eax // 6a40 | push 0x40 // ff15???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 837df800 | cmp dword ptr [ebp - 8], 0 // 7507 | jne 9 $sequence_11 = { 8819 41 48 75fa 56 ff15???????? ff75f8 } // n = 7, score = 300 // 8819 | mov byte ptr [ecx], bl // 41 | inc ecx // 48 | dec eax // 75fa | jne 0xfffffffc // 56 | push esi // ff15???????? | // ff75f8 | push dword ptr [ebp - 8] $sequence_12 = { 7407 c60100 41 48 75f9 ff75f8 } // n = 6, score = 300 // 7407 | je 9 // c60100 | mov byte ptr [ecx], 0 // 41 | inc ecx // 48 | dec eax // 75f9 | jne 0xfffffffb // ff75f8 | push dword ptr [ebp - 8] $sequence_13 = { e8???????? ff75e8 e8???????? 837df400 } // n = 4, score = 200 // e8???????? | // ff75e8 | push dword ptr [ebp - 0x18] // e8???????? | // 837df400 | cmp dword ptr [ebp - 0xc], 0 $sequence_14 = { 56 e8???????? 8b75e4 3bf3 } // n = 4, score = 200 // 56 | push esi // e8???????? | // 8b75e4 | mov esi, dword ptr [ebp - 0x1c] // 3bf3 | cmp esi, ebx $sequence_15 = { 8d4594 50 e8???????? 837df800 } // n = 4, score = 200 // 8d4594 | lea eax, dword ptr [ebp - 0x6c] // 50 | push eax // e8???????? | // 837df800 | cmp dword ptr [ebp - 8], 0 $sequence_16 = { ff75e8 53 ffd6 034514 50 } // n = 5, score = 200 // ff75e8 | push dword ptr [ebp - 0x18] // 53 | push ebx // ffd6 | call esi // 034514 | add eax, dword ptr [ebp + 0x14] // 50 | push eax $sequence_17 = { 51 e8???????? 85c0 0f84be000000 } // n = 4, score = 200 // 51 | push ecx // e8???????? | // 85c0 | test eax, eax // 0f84be000000 | je 0xc4 condition: 7 of them and filesize < 303104 }
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