Actor(s): TA428
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rule win_tmanger_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.tmanger." 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.tmanger" 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 = { c7415d382cd7bd c74161d47bdb0f c741651f013f62 c74169388b8e92 c7416d9b14f6a0 c7417180fcd6bb c74175d7401d36 } // n = 7, score = 300 // c7415d382cd7bd | push dword ptr [ecx + edi + 0x20] // c74161d47bdb0f | push ebx // c741651f013f62 | sar edi, 4 // c74169388b8e92 | cmp eax, edx // c7416d9b14f6a0 | je 0x44f // c7417180fcd6bb | lea eax, [edi + 1] // c74175d7401d36 | shl eax, 4 $sequence_1 = { c7415d382cd7bd c74161d47bdb0f c741651f013f62 c74169388b8e92 c7416d9b14f6a0 } // n = 5, score = 300 // c7415d382cd7bd | lea eax, [ebp + 0x10] // c74161d47bdb0f | ret // c741651f013f62 | push ebp // c74169388b8e92 | mov ebp, esp // c7416d9b14f6a0 | mov eax, dword ptr [ebp + 8] $sequence_2 = { c74169388b8e92 c7416d9b14f6a0 c7417180fcd6bb c74175d7401d36 } // n = 4, score = 300 // c74169388b8e92 | add edx, ebx // c7416d9b14f6a0 | mov dword ptr [ebp - 0x28], edx // c7417180fcd6bb | lea edx, [ecx - 8] // c74175d7401d36 | lea edx, [ecx - 8] $sequence_3 = { c74108cc6188ff c7410c16d9fdf8 c741103a71c135 c74114c2a02ab0 c74118d95dc845 c7411cf8f0564e } // n = 6, score = 300 // c74108cc6188ff | mov edi, dword ptr [ecx] // c7410c16d9fdf8 | test edi, edi // c741103a71c135 | je 0x40f // c74114c2a02ab0 | mov eax, dword ptr [edi] // c74118d95dc845 | ret // c7411cf8f0564e | push edi $sequence_4 = { c74114c2a02ab0 c74118d95dc845 c7411cf8f0564e c7412066b8276e } // n = 4, score = 300 // c74114c2a02ab0 | mov dword ptr [esp + 0x10], eax // c74118d95dc845 | mov al, byte ptr [esi] // c7411cf8f0564e | lea ecx, [esi + 0xc] // c7412066b8276e | push 6 $sequence_5 = { c741510f9f2997 c7415565449eac c741594d68b93a c7415d382cd7bd } // n = 4, score = 300 // c741510f9f2997 | mov ecx, edi // c7415565449eac | lea edx, [eax + 0xe] // c741594d68b93a | dec eax // c7415d382cd7bd | lea ecx, [ebp + 0x220] $sequence_6 = { c741510f9f2997 c7415565449eac c741594d68b93a c7415d382cd7bd c74161d47bdb0f c741651f013f62 c74169388b8e92 } // n = 7, score = 300 // c741510f9f2997 | mov dword ptr [ebp - 0x20], ecx // c7415565449eac | mov eax, dword ptr [ebx*4 + 0x5d1870] // c741594d68b93a | movzx eax, byte ptr [eax + ecx + 0x28] // c7415d382cd7bd | sar ebx, 6 // c74161d47bdb0f | mov eax, esi // c741651f013f62 | and eax, 0x3f // c74169388b8e92 | imul ecx, eax, 0x30 $sequence_7 = { c741103a71c135 c74114c2a02ab0 c74118d95dc845 c7411cf8f0564e c7412066b8276e c7412425d933d1 c7412861fdc72a } // n = 7, score = 300 // c741103a71c135 | imul ecx, eax, 0x30 // c74114c2a02ab0 | mov eax, dword ptr [edx*4 + 0x10023fc0] // c74118d95dc845 | test byte ptr [eax + ecx + 0x28], 1 // c7411cf8f0564e | je 0x1a7 // c7412066b8276e | lea eax, [ebp + 8] // c7412425d933d1 | mov dword ptr [ebp - 4], eax // c7412861fdc72a | sar edx, 6 $sequence_8 = { c74141fdea7736 c74145aed72316 c74149ff663a9d c7414dd22a7e91 c741510f9f2997 c7415565449eac c741594d68b93a } // n = 7, score = 300 // c74141fdea7736 | mov eax, dword ptr [ebx*4 + 0x5d1870] // c74145aed72316 | mov dword ptr [ebp - 0x2c], eax // c74149ff663a9d | mov dword ptr [ebp - 0x18], edx // c7414dd22a7e91 | sar ebx, 6 // c741510f9f2997 | and eax, 0x3f // c7415565449eac | imul edx, eax, 0x30 // c741594d68b93a | mov dword ptr [ebp - 0x1c], ebx $sequence_9 = { c7412066b8276e c7412425d933d1 c7412861fdc72a c7412cdf9134d2 c74130324d251d } // n = 5, score = 300 // c7412066b8276e | ret // c7412425d933d1 | dec eax // c7412861fdc72a | sub esp, 0x38 // c7412cdf9134d2 | dec eax // c74130324d251d | lea eax, [0x92e5] condition: 7 of them and filesize < 8252416 }
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