PWC describes this malware as a backdoor, capable of file management, upload and download of files, and execution of commands.
rule win_cameleon_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.cameleon." 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.cameleon" 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 = { 53 56 57 8bf9 897df0 c745ec00000000 8b07 } // n = 7, score = 100 // 53 | push ebx // 56 | push esi // 57 | push edi // 8bf9 | mov edi, ecx // 897df0 | mov dword ptr [ebp - 0x10], edi // c745ec00000000 | mov dword ptr [ebp - 0x14], 0 // 8b07 | mov eax, dword ptr [edi] $sequence_1 = { 8a80f8c70410 8807 47 46 8bcb c6458301 e8???????? } // n = 7, score = 100 // 8a80f8c70410 | mov al, byte ptr [eax + 0x1004c7f8] // 8807 | mov byte ptr [edi], al // 47 | inc edi // 46 | inc esi // 8bcb | mov ecx, ebx // c6458301 | mov byte ptr [ebp - 0x7d], 1 // e8???????? | $sequence_2 = { 83ec18 8bd4 8965ec c7421000000000 c7421400000000 } // n = 5, score = 100 // 83ec18 | sub esp, 0x18 // 8bd4 | mov edx, esp // 8965ec | mov dword ptr [ebp - 0x14], esp // c7421000000000 | mov dword ptr [edx + 0x10], 0 // c7421400000000 | mov dword ptr [edx + 0x14], 0 $sequence_3 = { 8d7dd0 837de408 0f437dd0 83ec18 8bd4 c7421000000000 c7421400000000 } // n = 7, score = 100 // 8d7dd0 | lea edi, [ebp - 0x30] // 837de408 | cmp dword ptr [ebp - 0x1c], 8 // 0f437dd0 | cmovae edi, dword ptr [ebp - 0x30] // 83ec18 | sub esp, 0x18 // 8bd4 | mov edx, esp // c7421000000000 | mov dword ptr [edx + 0x10], 0 // c7421400000000 | mov dword ptr [edx + 0x14], 0 $sequence_4 = { 48 a3???????? ff15???????? 8b0d???????? 89048d98ce0510 5d c3 } // n = 7, score = 100 // 48 | dec eax // a3???????? | // ff15???????? | // 8b0d???????? | // 89048d98ce0510 | mov dword ptr [ecx*4 + 0x1005ce98], eax // 5d | pop ebp // c3 | ret $sequence_5 = { 247f 88441628 eb12 0c80 88441628 8b0cbd50d60510 c644112900 } // n = 7, score = 100 // 247f | and al, 0x7f // 88441628 | mov byte ptr [esi + edx + 0x28], al // eb12 | jmp 0x14 // 0c80 | or al, 0x80 // 88441628 | mov byte ptr [esi + edx + 0x28], al // 8b0cbd50d60510 | mov ecx, dword ptr [edi*4 + 0x1005d650] // c644112900 | mov byte ptr [ecx + edx + 0x29], 0 $sequence_6 = { b83b000000 663bc8 0f94c0 84c0 7431 } // n = 5, score = 100 // b83b000000 | mov eax, 0x3b // 663bc8 | cmp cx, ax // 0f94c0 | sete al // 84c0 | test al, al // 7431 | je 0x33 $sequence_7 = { 8d55dc c645fc02 8d8d24ffffff e8???????? 8bc8 8b01 } // n = 6, score = 100 // 8d55dc | lea edx, [ebp - 0x24] // c645fc02 | mov byte ptr [ebp - 4], 2 // 8d8d24ffffff | lea ecx, [ebp - 0xdc] // e8???????? | // 8bc8 | mov ecx, eax // 8b01 | mov eax, dword ptr [ecx] $sequence_8 = { 8bd9 56 57 837b3800 0f848c010000 807b3d00 0f8482010000 } // n = 7, score = 100 // 8bd9 | mov ebx, ecx // 56 | push esi // 57 | push edi // 837b3800 | cmp dword ptr [ebx + 0x38], 0 // 0f848c010000 | je 0x192 // 807b3d00 | cmp byte ptr [ebx + 0x3d], 0 // 0f8482010000 | je 0x188 $sequence_9 = { 5d c20400 85ff 75d4 897e10 837e1408 720f } // n = 7, score = 100 // 5d | pop ebp // c20400 | ret 4 // 85ff | test edi, edi // 75d4 | jne 0xffffffd6 // 897e10 | mov dword ptr [esi + 0x10], edi // 837e1408 | cmp dword ptr [esi + 0x14], 8 // 720f | jb 0x11 condition: 7 of them and filesize < 824320 }
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