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rule win_fickerstealer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.fickerstealer." 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.fickerstealer" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 8d4da4 f20f114b08 f20f1103 8d5de4 89da e8???????? f20f104750 } // n = 7, score = 200 // 8d4da4 | lea ecx, [ebp - 0x5c] // f20f114b08 | movsd qword ptr [ebx + 8], xmm1 // f20f1103 | movsd qword ptr [ebx], xmm0 // 8d5de4 | lea ebx, [ebp - 0x1c] // 89da | mov edx, ebx // e8???????? | // f20f104750 | movsd xmm0, qword ptr [edi + 0x50] $sequence_1 = { e8???????? 59 89f1 83fa04 0fc9 898dd4feffff 0f85f0250000 } // n = 7, score = 200 // e8???????? | // 59 | pop ecx // 89f1 | mov ecx, esi // 83fa04 | cmp edx, 4 // 0fc9 | bswap ecx // 898dd4feffff | mov dword ptr [ebp - 0x12c], ecx // 0f85f0250000 | jne 0x25f6 $sequence_2 = { f20f118c1198000000 f20f11841190000000 66894106 8b4c2414 8b5c2478 8b442418 f6d1 } // n = 7, score = 200 // f20f118c1198000000 | movsd qword ptr [ecx + edx + 0x98], xmm1 // f20f11841190000000 | movsd qword ptr [ecx + edx + 0x90], xmm0 // 66894106 | mov word ptr [ecx + 6], ax // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 8b5c2478 | mov ebx, dword ptr [esp + 0x78] // 8b442418 | mov eax, dword ptr [esp + 0x18] // f6d1 | not cl $sequence_3 = { e8???????? 59 5d c3 55 89e5 53 } // n = 7, score = 200 // e8???????? | // 59 | pop ecx // 5d | pop ebp // c3 | ret // 55 | push ebp // 89e5 | mov ebp, esp // 53 | push ebx $sequence_4 = { eb78 8d7c2410 89f9 e8???????? 8b5708 8b0f 89d3 } // n = 7, score = 200 // eb78 | jmp 0x7a // 8d7c2410 | lea edi, [esp + 0x10] // 89f9 | mov ecx, edi // e8???????? | // 8b5708 | mov edx, dword ptr [edi + 8] // 8b0f | mov ecx, dword ptr [edi] // 89d3 | mov ebx, edx $sequence_5 = { 8d4ddc f20f1045a0 f20f104d98 f20f114208 f20f110a 50 e8???????? } // n = 7, score = 200 // 8d4ddc | lea ecx, [ebp - 0x24] // f20f1045a0 | movsd xmm0, qword ptr [ebp - 0x60] // f20f104d98 | movsd xmm1, qword ptr [ebp - 0x68] // f20f114208 | movsd qword ptr [edx + 8], xmm0 // f20f110a | movsd qword ptr [edx], xmm1 // 50 | push eax // e8???????? | $sequence_6 = { 8b8d60feffff 21c1 8b4584 898d24fdffff 8d8d54feffff 8985d4feffff 8b45bc } // n = 7, score = 200 // 8b8d60feffff | mov ecx, dword ptr [ebp - 0x1a0] // 21c1 | and ecx, eax // 8b4584 | mov eax, dword ptr [ebp - 0x7c] // 898d24fdffff | mov dword ptr [ebp - 0x2dc], ecx // 8d8d54feffff | lea ecx, [ebp - 0x1ac] // 8985d4feffff | mov dword ptr [ebp - 0x12c], eax // 8b45bc | mov eax, dword ptr [ebp - 0x44] $sequence_7 = { b002 09f2 0f94c1 28c8 8d65f4 5e 5f } // n = 7, score = 200 // b002 | mov al, 2 // 09f2 | or edx, esi // 0f94c1 | sete cl // 28c8 | sub al, cl // 8d65f4 | lea esp, [ebp - 0xc] // 5e | pop esi // 5f | pop edi $sequence_8 = { e8???????? 59 31c9 85c0 0f445508 0f94c1 0f45f8 } // n = 7, score = 200 // e8???????? | // 59 | pop ecx // 31c9 | xor ecx, ecx // 85c0 | test eax, eax // 0f445508 | cmove edx, dword ptr [ebp + 8] // 0f94c1 | sete cl // 0f45f8 | cmovne edi, eax $sequence_9 = { c3 55 89e5 57 56 81ec80000000 8b750c } // n = 7, score = 200 // c3 | ret // 55 | push ebp // 89e5 | mov ebp, esp // 57 | push edi // 56 | push esi // 81ec80000000 | sub esp, 0x80 // 8b750c | mov esi, dword ptr [ebp + 0xc] condition: 7 of them and filesize < 598016 }
rule win_fickerstealer_w0 { meta: author = "Ben Cohen, CyberArk" date = "22-02-2021" version = "1.0" hash = "a4113ccb55e06e783b6cb213647614f039aa7dbb454baa338459ccf37897ebd6" source = "https://github.com/cyberark/malware-research/blob/master/FickerStealer/Ficker_Stealer.yar" description = "Yara rule for Ficker Stealer" malpedia_rule_date = "20210726" malpedia_hash = "" malpedia_version = "20210726" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.fickerstealer" strings: //$decryption_pattern = { 89 ?? C1 ?? ?? 31 ?? 89 ?? C1 ?? ?? 31 ?? 8B ?? ?? 89 ?? C1 ?? ?? 31 } $c2_const = { 0C 00 0F 0A [0-4] 0B 0A 0B 0A } $s1 = "kindmessage" $s2 = "SomeNone" $s3 = ".Kind" condition: //$decryption_pattern and $c2_const and (1 of ($s*)) and uint16(0) == 0x5A4D }
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