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rule win_thumbthief_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.thumbthief." 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.thumbthief" 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 = { ebac 834dfcff 33c0 8b7dc4 6689444ffe ff7310 e8???????? } // n = 7, score = 100 // ebac | jmp 0xffffffae // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 33c0 | xor eax, eax // 8b7dc4 | mov edi, dword ptr [ebp - 0x3c] // 6689444ffe | mov word ptr [edi + ecx*2 - 2], ax // ff7310 | push dword ptr [ebx + 0x10] // e8???????? | $sequence_1 = { ffd0 83c414 8bd8 85f6 7424 f6461840 8bce } // n = 7, score = 100 // ffd0 | call eax // 83c414 | add esp, 0x14 // 8bd8 | mov ebx, eax // 85f6 | test esi, esi // 7424 | je 0x26 // f6461840 | test byte ptr [esi + 0x18], 0x40 // 8bce | mov ecx, esi $sequence_2 = { c645fc02 8b750c 85f6 7526 68???????? 68???????? 8d8d38ffffff } // n = 7, score = 100 // c645fc02 | mov byte ptr [ebp - 4], 2 // 8b750c | mov esi, dword ptr [ebp + 0xc] // 85f6 | test esi, esi // 7526 | jne 0x28 // 68???????? | // 68???????? | // 8d8d38ffffff | lea ecx, [ebp - 0xc8] $sequence_3 = { ff7624 8b4620 ffd0 83c408 85c0 7409 83f805 } // n = 7, score = 100 // ff7624 | push dword ptr [esi + 0x24] // 8b4620 | mov eax, dword ptr [esi + 0x20] // ffd0 | call eax // 83c408 | add esp, 8 // 85c0 | test eax, eax // 7409 | je 0xb // 83f805 | cmp eax, 5 $sequence_4 = { eb02 33c9 46 894c2434 8d0448 03f0 83fe46 } // n = 7, score = 100 // eb02 | jmp 4 // 33c9 | xor ecx, ecx // 46 | inc esi // 894c2434 | mov dword ptr [esp + 0x34], ecx // 8d0448 | lea eax, [eax + ecx*2] // 03f0 | add esi, eax // 83fe46 | cmp esi, 0x46 $sequence_5 = { ff74241c ba15000000 8bce e8???????? 83c404 8b542408 33c9 } // n = 7, score = 100 // ff74241c | push dword ptr [esp + 0x1c] // ba15000000 | mov edx, 0x15 // 8bce | mov ecx, esi // e8???????? | // 83c404 | add esp, 4 // 8b542408 | mov edx, dword ptr [esp + 8] // 33c9 | xor ecx, ecx $sequence_6 = { fec8 884713 0fb6c0 8b44871c 50 6a00 ba0a000000 } // n = 7, score = 100 // fec8 | dec al // 884713 | mov byte ptr [edi + 0x13], al // 0fb6c0 | movzx eax, al // 8b44871c | mov eax, dword ptr [edi + eax*4 + 0x1c] // 50 | push eax // 6a00 | push 0 // ba0a000000 | mov edx, 0xa $sequence_7 = { e9???????? 8d8df4feffff e9???????? 8d8d1cffffff e9???????? 8d8d08ffffff e9???????? } // n = 7, score = 100 // e9???????? | // 8d8df4feffff | lea ecx, [ebp - 0x10c] // e9???????? | // 8d8d1cffffff | lea ecx, [ebp - 0xe4] // e9???????? | // 8d8d08ffffff | lea ecx, [ebp - 0xf8] // e9???????? | $sequence_8 = { e8???????? c645fc00 33c0 8b55bc 8bca 8b5dc0 8bfb } // n = 7, score = 100 // e8???????? | // c645fc00 | mov byte ptr [ebp - 4], 0 // 33c0 | xor eax, eax // 8b55bc | mov edx, dword ptr [ebp - 0x44] // 8bca | mov ecx, edx // 8b5dc0 | mov ebx, dword ptr [ebp - 0x40] // 8bfb | mov edi, ebx $sequence_9 = { c645fc01 e8???????? c645fc02 8d4508 c7473c00000000 8d4f44 c7474000000000 } // n = 7, score = 100 // c645fc01 | mov byte ptr [ebp - 4], 1 // e8???????? | // c645fc02 | mov byte ptr [ebp - 4], 2 // 8d4508 | lea eax, [ebp + 8] // c7473c00000000 | mov dword ptr [edi + 0x3c], 0 // 8d4f44 | lea ecx, [edi + 0x44] // c7474000000000 | mov dword ptr [edi + 0x40], 0 condition: 7 of them and filesize < 4235264 }
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