Actor(s): TA428
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rule win_tmanger_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { c7410491b20524 c74108cc6188ff c7410c16d9fdf8 c741103a71c135 c74114c2a02ab0 c74118d95dc845 c7411cf8f0564e } // n = 7, score = 200 // c7410491b20524 | mov ecx, ebx // c74108cc6188ff | call esi // c7410c16d9fdf8 | inc edi // c741103a71c135 | mov ecx, dword ptr [ebp - 0x318] // c74114c2a02ab0 | mov eax, dword ptr [ecx + 4] // c74118d95dc845 | mov dword ptr [ebp - 0x310], eax // c7411cf8f0564e | test eax, eax $sequence_1 = { c74118d95dc845 c7411cf8f0564e c7412066b8276e c7412425d933d1 c7412861fdc72a c7412cdf9134d2 c74130324d251d } // n = 7, score = 200 // c74118d95dc845 | call esi // c7411cf8f0564e | mov dword ptr [ebx + 0x7c], eax // c7412066b8276e | test eax, eax // c7412425d933d1 | je 0x151d // c7412861fdc72a | mov eax, dword ptr [ebx] // c7412cdf9134d2 | mov esi, dword ptr [eax + 0x30] // c74130324d251d | mov ecx, ebx $sequence_2 = { c741103a71c135 c74114c2a02ab0 c74118d95dc845 c7411cf8f0564e c7412066b8276e } // n = 5, score = 200 // c741103a71c135 | mov ecx, dword ptr [ebp - 0x3b4] // c74114c2a02ab0 | lea ecx, [ecx - 0x10] // c74118d95dc845 | lea ecx, [ebp - 0x3e8] // c7411cf8f0564e | lea ecx, [ebp - 0x3b4] // c7412066b8276e | push 0 $sequence_3 = { c7415565449eac c741594d68b93a c7415d382cd7bd c74161d47bdb0f } // n = 4, score = 200 // c7415565449eac | lea eax, [0xa594] // c741594d68b93a | dec eax // c7415d382cd7bd | lea edx, [0x8b45] // c74161d47bdb0f | mov ecx, 4 $sequence_4 = { c74145aed72316 c74149ff663a9d c7414dd22a7e91 c741510f9f2997 c7415565449eac } // n = 5, score = 200 // c74145aed72316 | mov ecx, dword ptr [ebp - 0xc] // c74149ff663a9d | lea ecx, [ebp - 0x3dc] // c7414dd22a7e91 | lea ecx, [ebp - 0x155c] // c741510f9f2997 | lea ecx, [ebp - 0x118] // c7415565449eac | lea ecx, [ebp - 0xdc] $sequence_5 = { c7410c16d9fdf8 c741103a71c135 c74114c2a02ab0 c74118d95dc845 } // n = 4, score = 200 // c7410c16d9fdf8 | sub esp, eax // c741103a71c135 | pop edi // c74114c2a02ab0 | ret // c74118d95dc845 | mov eax, 0xf17b3d $sequence_6 = { c74130324d251d c74134375ec19d c7413893c82e55 c7413c1b4a468b } // n = 4, score = 200 // c74130324d251d | lea ecx, [ebp - 0x2f0] // c74134375ec19d | lea ecx, [ebp - 0x3d4] // c7413893c82e55 | push dword ptr [ebp - 0xa4] // c7413c1b4a468b | push dword ptr [ebp - 0x184] $sequence_7 = { c741594d68b93a c7415d382cd7bd c74161d47bdb0f c741651f013f62 c74169388b8e92 c7416d9b14f6a0 } // n = 6, score = 200 // c741594d68b93a | sar ecx, 6 // c7415d382cd7bd | imul eax, eax, 0x30 // c74161d47bdb0f | add eax, dword ptr [ecx*4 + 0x465b40] // c741651f013f62 | mov eax, edx // c74169388b8e92 | mov ecx, 0x40 // c7416d9b14f6a0 | and eax, 0x3f $sequence_8 = { c7412425d933d1 c7412861fdc72a c7412cdf9134d2 c74130324d251d c74134375ec19d c7413893c82e55 } // n = 6, score = 200 // c7412425d933d1 | jle 0xc5 // c7412861fdc72a | lea edx, [edi + eax] // c7412cdf9134d2 | mov eax, ecx // c74130324d251d | cmp dword ptr [eax*8 + 0x420188], edx // c74134375ec19d | je 0xab // c7413893c82e55 | inc eax $sequence_9 = { c74169388b8e92 c7416d9b14f6a0 c7417180fcd6bb c74175d7401d36 c7417958fffa19 } // n = 5, score = 200 // c74169388b8e92 | mov byte ptr [ebp - 4], 0x4b // c7416d9b14f6a0 | push eax // c7417180fcd6bb | lea ecx, [ebp - 0x3d8] // c74175d7401d36 | lea edi, [ebx + 0x9038] // c7417958fffa19 | mov byte ptr [ebp - 4], 0x47 condition: 7 of them and filesize < 8252416 }
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