Actor(s): Gamaredon Group, Operation Armageddon
There is no description at this point.
rule win_pteranodon_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.pteranodon." 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.pteranodon" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { f2c3 8b4de4 33cd f2e81328feff } // n = 4, score = 100 // f2c3 | bnd ret // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 33cd | xor ecx, ebp // f2e81328feff | bnd call 0xfffe2819 $sequence_1 = { 40 8d8dd8feffff 50 ffb5d8feffff e8???????? 56 8d8dd8feffff } // n = 7, score = 100 // 40 | inc eax // 8d8dd8feffff | lea ecx, [ebp - 0x128] // 50 | push eax // ffb5d8feffff | push dword ptr [ebp - 0x128] // e8???????? | // 56 | push esi // 8d8dd8feffff | lea ecx, [ebp - 0x128] $sequence_2 = { 85c9 0f84d3000000 8b048d94f00210 89859cf8ffff 85c0 0f8498000000 } // n = 6, score = 100 // 85c9 | test ecx, ecx // 0f84d3000000 | je 0xd9 // 8b048d94f00210 | mov eax, dword ptr [ecx*4 + 0x1002f094] // 89859cf8ffff | mov dword ptr [ebp - 0x764], eax // 85c0 | test eax, eax // 0f8498000000 | je 0x9e $sequence_3 = { 8d041f 8975d0 8975e0 8975f0 c745f4d0d00210 8b7485bc 8d4601 } // n = 7, score = 100 // 8d041f | lea eax, [edi + ebx] // 8975d0 | mov dword ptr [ebp - 0x30], esi // 8975e0 | mov dword ptr [ebp - 0x20], esi // 8975f0 | mov dword ptr [ebp - 0x10], esi // c745f4d0d00210 | mov dword ptr [ebp - 0xc], 0x1002d0d0 // 8b7485bc | mov esi, dword ptr [ebp + eax*4 - 0x44] // 8d4601 | lea eax, [esi + 1] $sequence_4 = { 8bc8 e8???????? 6a01 57 e8???????? 8d8520f9ffff } // n = 6, score = 100 // 8bc8 | mov ecx, eax // e8???????? | // 6a01 | push 1 // 57 | push edi // e8???????? | // 8d8520f9ffff | lea eax, [ebp - 0x6e0] $sequence_5 = { ffb590feffff e8???????? 8b858cfeffff c785a4feffff0f000000 c785a0feffff00000000 c68590feffff00 } // n = 6, score = 100 // ffb590feffff | push dword ptr [ebp - 0x170] // e8???????? | // 8b858cfeffff | mov eax, dword ptr [ebp - 0x174] // c785a4feffff0f000000 | mov dword ptr [ebp - 0x15c], 0xf // c785a0feffff00000000 | mov dword ptr [ebp - 0x160], 0 // c68590feffff00 | mov byte ptr [ebp - 0x170], 0 $sequence_6 = { c746140f000000 c7461000000000 c60600 807dec00 7504 } // n = 5, score = 100 // c746140f000000 | mov dword ptr [esi + 0x14], 0xf // c7461000000000 | mov dword ptr [esi + 0x10], 0 // c60600 | mov byte ptr [esi], 0 // 807dec00 | cmp byte ptr [ebp - 0x14], 0 // 7504 | jne 6 $sequence_7 = { 8d8d08f9ffff e8???????? 8d8da8f8ffff c645fc31 51 8bd0 8d8dc0f8ffff } // n = 7, score = 100 // 8d8d08f9ffff | lea ecx, [ebp - 0x6f8] // e8???????? | // 8d8da8f8ffff | lea ecx, [ebp - 0x758] // c645fc31 | mov byte ptr [ebp - 4], 0x31 // 51 | push ecx // 8bd0 | mov edx, eax // 8d8dc0f8ffff | lea ecx, [ebp - 0x740] $sequence_8 = { 50 ff15???????? 8b35???????? 83f801 } // n = 4, score = 100 // 50 | push eax // ff15???????? | // 8b35???????? | // 83f801 | cmp eax, 1 $sequence_9 = { 0f83c0000000 53 56 8d4dd8 e8???????? 8b4dec } // n = 6, score = 100 // 0f83c0000000 | jae 0xc6 // 53 | push ebx // 56 | push esi // 8d4dd8 | lea ecx, [ebp - 0x28] // e8???????? | // 8b4dec | mov ecx, dword ptr [ebp - 0x14] condition: 7 of them and filesize < 499712 }
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