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 = "2023-03-29" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 53 53 6800000008 57 } // n = 4, score = 500 // 53 | push ebx // 53 | push ebx // 6800000008 | push 0x8000000 // 57 | push edi $sequence_1 = { 6800000008 57 53 53 } // n = 4, score = 500 // 6800000008 | push 0x8000000 // 57 | push edi // 53 | push ebx // 53 | push ebx $sequence_2 = { 8945cc e8???????? 68???????? 8945d4 } // n = 4, score = 500 // 8945cc | mov dword ptr [ebp - 0x34], eax // e8???????? | // 68???????? | // 8945d4 | mov dword ptr [ebp - 0x2c], eax $sequence_3 = { 68???????? 8945d4 e8???????? 68???????? 8945d0 e8???????? } // n = 6, score = 500 // 68???????? | // 8945d4 | mov dword ptr [ebp - 0x2c], eax // e8???????? | // 68???????? | // 8945d0 | mov dword ptr [ebp - 0x30], eax // e8???????? | $sequence_4 = { 75f9 53 ff15???????? 8b75f8 } // n = 4, score = 400 // 75f9 | jne 0xfffffffb // 53 | push ebx // ff15???????? | // 8b75f8 | mov esi, dword ptr [ebp - 8] $sequence_5 = { 8b4508 0345f0 0fbe08 8b45f0 33d2 } // n = 5, 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] // 33d2 | xor edx, edx $sequence_6 = { 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_7 = { 8b45f0 8b4d08 0fb70c41 8b45f0 } // n = 4, score = 400 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 0fb70c41 | movzx ecx, word ptr [ecx + eax*2] // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_8 = { 81e1ff000000 8b45ec 8b55f8 66890c42 eb14 8b45ec } // n = 6, score = 400 // 81e1ff000000 | and ecx, 0xff // 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] $sequence_9 = { 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_10 = { 6a40 ff15???????? 8945f8 837df800 7507 33c0 } // n = 6, score = 400 // 6a40 | push 0x40 // ff15???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 837df800 | cmp dword ptr [ebp - 8], 0 // 7507 | jne 9 // 33c0 | xor eax, eax $sequence_11 = { 7507 33c0 e9???????? c745f004000000 } // n = 4, score = 400 // 7507 | jne 9 // 33c0 | xor eax, eax // e9???????? | // c745f004000000 | mov dword ptr [ebp - 0x10], 4 $sequence_12 = { 75fa 56 ff15???????? ff75f8 } // n = 4, score = 300 // 75fa | jne 0xfffffffc // 56 | push esi // ff15???????? | // ff75f8 | push dword ptr [ebp - 8] $sequence_13 = { c60100 41 48 75f9 ff75f8 } // n = 5, score = 300 // c60100 | mov byte ptr [ecx], 0 // 41 | inc ecx // 48 | dec eax // 75f9 | jne 0xfffffffb // ff75f8 | push dword ptr [ebp - 8] $sequence_14 = { 837de405 7519 397df4 7507 } // n = 4, score = 200 // 837de405 | cmp dword ptr [ebp - 0x1c], 5 // 7519 | jne 0x1b // 397df4 | cmp dword ptr [ebp - 0xc], edi // 7507 | jne 9 $sequence_15 = { 68???????? e8???????? 8945b4 68???????? e8???????? } // n = 5, score = 200 // 68???????? | // e8???????? | // 8945b4 | mov dword ptr [ebp - 0x4c], eax // 68???????? | // e8???????? | $sequence_16 = { 895dec 66c745f00005 ff15???????? 85c0 741e 8d45fc } // n = 6, score = 200 // 895dec | mov dword ptr [ebp - 0x14], ebx // 66c745f00005 | mov word ptr [ebp - 0x10], 0x500 // ff15???????? | // 85c0 | test eax, eax // 741e | je 0x20 // 8d45fc | lea eax, [ebp - 4] condition: 7 of them and filesize < 303104 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below.
Please propose all changes regarding references on the Malpedia library page
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY