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 = "2023-01-25" 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 = "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 = { 66a1???????? 8d9424b0020000 668907 8bf2 0f1f4000 8a02 42 } // n = 7, score = 200 // 66a1???????? | // 8d9424b0020000 | lea edx, [esp + 0x2b0] // 668907 | mov word ptr [edi], ax // 8bf2 | mov esi, edx // 0f1f4000 | nop dword ptr [eax] // 8a02 | mov al, byte ptr [edx] // 42 | inc edx $sequence_1 = { 75f3 68a0860100 ff74241c 50 e8???????? 8b7c241c } // n = 6, score = 200 // 75f3 | jne 0xfffffff5 // 68a0860100 | push 0x186a0 // ff74241c | push dword ptr [esp + 0x1c] // 50 | push eax // e8???????? | // 8b7c241c | mov edi, dword ptr [esp + 0x1c] $sequence_2 = { 83c004 68e8030000 50 8d8424580b0000 50 e8???????? } // n = 6, score = 200 // 83c004 | add eax, 4 // 68e8030000 | push 0x3e8 // 50 | push eax // 8d8424580b0000 | lea eax, [esp + 0xb58] // 50 | push eax // e8???????? | $sequence_3 = { 8d85b4f3ffff 50 8bcb 8d1432 } // n = 4, score = 200 // 8d85b4f3ffff | lea eax, [ebp - 0xc4c] // 50 | push eax // 8bcb | mov ecx, ebx // 8d1432 | lea edx, [edx + esi] $sequence_4 = { 6b45e430 8945e0 8d8048334200 8945e4 803800 } // n = 5, score = 200 // 6b45e430 | imul eax, dword ptr [ebp - 0x1c], 0x30 // 8945e0 | mov dword ptr [ebp - 0x20], eax // 8d8048334200 | lea eax, [eax + 0x423348] // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 803800 | cmp byte ptr [eax], 0 $sequence_5 = { 56 e8???????? 83c410 33f6 83ff05 0f8e33010000 } // n = 6, score = 200 // 56 | push esi // e8???????? | // 83c410 | add esp, 0x10 // 33f6 | xor esi, esi // 83ff05 | cmp edi, 5 // 0f8e33010000 | jle 0x139 $sequence_6 = { 8d040f 50 e8???????? 83c410 ff742424 } // n = 5, score = 200 // 8d040f | lea eax, [edi + ecx] // 50 | push eax // e8???????? | // 83c410 | add esp, 0x10 // ff742424 | push dword ptr [esp + 0x24] $sequence_7 = { 8a45fe 8b0c8d48404200 88441129 8b0b } // n = 4, score = 200 // 8a45fe | mov al, byte ptr [ebp - 2] // 8b0c8d48404200 | mov ecx, dword ptr [ecx*4 + 0x424048] // 88441129 | mov byte ptr [ecx + edx + 0x29], al // 8b0b | mov ecx, dword ptr [ebx] condition: 7 of them and filesize < 327680 }
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