Actor(s): Greenbug, APT34
There is no description at this point.
rule win_ismagent_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.ismagent." 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.ismagent" 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 = { 03048d48404200 50 ff15???????? 5d } // n = 4, score = 200 // 03048d48404200 | add eax, dword ptr [ecx*4 + 0x424048] // 50 | push eax // ff15???????? | // 5d | pop ebp $sequence_1 = { 68a0860100 e8???????? ba???????? 89442444 8bf8 } // n = 5, score = 200 // 68a0860100 | push 0x186a0 // e8???????? | // ba???????? | // 89442444 | mov dword ptr [esp + 0x44], eax // 8bf8 | mov edi, eax $sequence_2 = { 81f900000200 741c 81f900000400 7542 0c80 88441628 8b04bd48404200 } // n = 7, score = 200 // 81f900000200 | cmp ecx, 0x20000 // 741c | je 0x1e // 81f900000400 | cmp ecx, 0x40000 // 7542 | jne 0x44 // 0c80 | or al, 0x80 // 88441628 | mov byte ptr [esi + edx + 0x28], al // 8b04bd48404200 | mov eax, dword ptr [edi*4 + 0x424048] $sequence_3 = { ff751c 57 ffd3 84c0 7405 833e00 } // n = 6, score = 200 // ff751c | push dword ptr [ebp + 0x1c] // 57 | push edi // ffd3 | call ebx // 84c0 | test al, al // 7405 | je 7 // 833e00 | cmp dword ptr [esi], 0 $sequence_4 = { 84c0 744d 8b9db8f3ffff 8dbdc0f7ffff 33f6 8d0433 50 } // n = 7, score = 200 // 84c0 | test al, al // 744d | je 0x4f // 8b9db8f3ffff | mov ebx, dword ptr [ebp - 0xc48] // 8dbdc0f7ffff | lea edi, [ebp - 0x840] // 33f6 | xor esi, esi // 8d0433 | lea eax, [ebx + esi] // 50 | push eax $sequence_5 = { 50 e8???????? 83a64840420000 59 83c604 } // n = 5, score = 200 // 50 | push eax // e8???????? | // 83a64840420000 | and dword ptr [esi + 0x424048], 0 // 59 | pop ecx // 83c604 | add esi, 4 $sequence_6 = { eb7c c745e000fe4100 ebbb d9e8 8b4510 dd18 e9???????? } // n = 7, score = 200 // eb7c | jmp 0x7e // c745e000fe4100 | mov dword ptr [ebp - 0x20], 0x41fe00 // ebbb | jmp 0xffffffbd // d9e8 | fld1 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // dd18 | fstp qword ptr [eax] // e9???????? | $sequence_7 = { 8b7c241c 83c40c c744241401000000 8d4e01 803c3900 8d0439 } // n = 6, score = 200 // 8b7c241c | mov edi, dword ptr [esp + 0x1c] // 83c40c | add esp, 0xc // c744241401000000 | mov dword ptr [esp + 0x14], 1 // 8d4e01 | lea ecx, [esi + 1] // 803c3900 | cmp byte ptr [ecx + edi], 0 // 8d0439 | lea eax, [ecx + edi] condition: 7 of them and filesize < 327680 }
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