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 = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { ba???????? 6a00 6800000080 6a00 6a00 68???????? 53 } // n = 7, score = 200 // ba???????? | // 6a00 | push 0 // 6800000080 | push 0x80000000 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // 53 | push ebx $sequence_1 = { 89442440 85c0 752b 50 68???????? } // n = 5, score = 200 // 89442440 | mov dword ptr [esp + 0x40], eax // 85c0 | test eax, eax // 752b | jne 0x2d // 50 | push eax // 68???????? | $sequence_2 = { eb7c c745e000fe4100 ebbb d9e8 8b4510 } // n = 5, score = 200 // eb7c | jmp 0x7e // c745e000fe4100 | mov dword ptr [ebp - 0x20], 0x41fe00 // ebbb | jmp 0xffffffbd // d9e8 | fld1 // 8b4510 | mov eax, dword ptr [ebp + 0x10] $sequence_3 = { e8???????? 83c408 89442418 85c0 0f8479020000 } // n = 5, score = 200 // e8???????? | // 83c408 | add esp, 8 // 89442418 | mov dword ptr [esp + 0x18], eax // 85c0 | test eax, eax // 0f8479020000 | je 0x27f $sequence_4 = { 68e8030000 ff15???????? 8d8c2418030000 8d5101 } // n = 4, score = 200 // 68e8030000 | push 0x3e8 // ff15???????? | // 8d8c2418030000 | lea ecx, [esp + 0x318] // 8d5101 | lea edx, [ecx + 1] $sequence_5 = { 7432 8d842418030000 68???????? 50 e8???????? 8bf0 } // n = 6, score = 200 // 7432 | je 0x34 // 8d842418030000 | lea eax, [esp + 0x318] // 68???????? | // 50 | push eax // e8???????? | // 8bf0 | mov esi, eax $sequence_6 = { 8bf2 0f1f4000 8a02 42 84c0 75f9 8dbc2400070000 } // n = 7, score = 200 // 8bf2 | mov esi, edx // 0f1f4000 | nop dword ptr [eax] // 8a02 | mov al, byte ptr [edx] // 42 | inc edx // 84c0 | test al, al // 75f9 | jne 0xfffffffb // 8dbc2400070000 | lea edi, [esp + 0x700] $sequence_7 = { 8d0439 7413 0f1f4000 803823 740a } // n = 5, score = 200 // 8d0439 | lea eax, [ecx + edi] // 7413 | je 0x15 // 0f1f4000 | nop dword ptr [eax] // 803823 | cmp byte ptr [eax], 0x23 // 740a | je 0xc condition: 7 of them and filesize < 327680 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below. Changes regarding references should be proposed on the Malpedia library page.
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY