Actor(s): Equation Group
Standalone implant. Potentially tied to a framework called PATROLWAGON.
rule win_tildeb_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.tildeb." 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.tildeb" 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 = { 899de4fdffff 6800100000 ff15???????? b9900c0000 33c0 bf???????? f3ab } // n = 7, score = 100 // 899de4fdffff | mov dword ptr [ebp - 0x21c], ebx // 6800100000 | push 0x1000 // ff15???????? | // b9900c0000 | mov ecx, 0xc90 // 33c0 | xor eax, eax // bf???????? | // f3ab | rep stosd dword ptr es:[edi], eax $sequence_1 = { 81c494010000 c3 b809000000 5e 81c494010000 } // n = 5, score = 100 // 81c494010000 | add esp, 0x194 // c3 | ret // b809000000 | mov eax, 9 // 5e | pop esi // 81c494010000 | add esp, 0x194 $sequence_2 = { 50 ffd6 893d???????? 6a02 8b15???????? } // n = 5, score = 100 // 50 | push eax // ffd6 | call esi // 893d???????? | // 6a02 | push 2 // 8b15???????? | $sequence_3 = { e9???????? 8d4c2428 e8???????? 8d4c241c 88442417 } // n = 5, score = 100 // e9???????? | // 8d4c2428 | lea ecx, [esp + 0x28] // e8???????? | // 8d4c241c | lea ecx, [esp + 0x1c] // 88442417 | mov byte ptr [esp + 0x17], al $sequence_4 = { 8d431c b910000000 8bf5 8bf8 6a40 50 f3a5 } // n = 7, score = 100 // 8d431c | lea eax, [ebx + 0x1c] // b910000000 | mov ecx, 0x10 // 8bf5 | mov esi, ebp // 8bf8 | mov edi, eax // 6a40 | push 0x40 // 50 | push eax // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] $sequence_5 = { 51 6899190000 68???????? 68???????? } // n = 4, score = 100 // 51 | push ecx // 6899190000 | push 0x1999 // 68???????? | // 68???????? | $sequence_6 = { 50 ffd6 893d???????? 6a02 8b15???????? 52 e8???????? } // n = 7, score = 100 // 50 | push eax // ffd6 | call esi // 893d???????? | // 6a02 | push 2 // 8b15???????? | // 52 | push edx // e8???????? | $sequence_7 = { 8b1d???????? 83c408 33ff 8b28 8d7004 8d561c 6a5c } // n = 7, score = 100 // 8b1d???????? | // 83c408 | add esp, 8 // 33ff | xor edi, edi // 8b28 | mov ebp, dword ptr [eax] // 8d7004 | lea esi, [eax + 4] // 8d561c | lea edx, [esi + 0x1c] // 6a5c | push 0x5c $sequence_8 = { 8bdd f2ae f7d1 2bf9 8bc1 } // n = 5, score = 100 // 8bdd | mov ebx, ebp // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 2bf9 | sub edi, ecx // 8bc1 | mov eax, ecx $sequence_9 = { a1???????? 85c0 0f85b6010000 55 e8???????? 8b1d???????? } // n = 6, score = 100 // a1???????? | // 85c0 | test eax, eax // 0f85b6010000 | jne 0x1bc // 55 | push ebp // e8???????? | // 8b1d???????? | condition: 7 of them and filesize < 8532488 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below.
Please propose all changes regarding references on the Malpedia library page
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY