SYMBOLCOMMON_NAMEaka. SYNONYMS
win.tildeb (Back to overview)

tildeb

Actor(s): Equation Group


Standalone implant. Potentially tied to a framework called PATROLWAGON.

References
2018-12-13Trend MicroMohamad Mokbel
@techreport{mokbel:20181213:tildeb:99fb939, author = {Mohamad Mokbel}, title = {{Tildeb: An Implant from the Shadow Brokers’ Leak}}, date = {2018-12-13}, institution = {Trend Micro}, url = {https://documents.trendmicro.com/assets/tech-brief-tildeb-analyzing-the-18-year-old-implant-from-the-shadow-brokers-leak.pdf}, language = {English}, urldate = {2021-09-19} } Tildeb: An Implant from the Shadow Brokers’ Leak
tildeb
Yara Rules
[TLP:WHITE] win_tildeb_auto (20220411 | Detects win.tildeb.)
rule win_tildeb_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        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 = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { e8???????? 85c0 7516 b801000000 8b4df0 64890d00000000 5f }
            // n = 7, score = 100
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7516                 | jne                 0x18
            //   b801000000           | mov                 eax, 1
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   5f                   | pop                 edi

        $sequence_1 = { 55 ff15???????? 3d040000c0 751b 8b07 50 ff15???????? }
            // n = 7, score = 100
            //   55                   | push                ebp
            //   ff15????????         |                     
            //   3d040000c0           | cmp                 eax, 0xc0000004
            //   751b                 | jne                 0x1d
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_2 = { 50 51 e8???????? 8d9424bc030000 6a21 8d84242c010000 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8d9424bc030000       | lea                 edx, dword ptr [esp + 0x3bc]
            //   6a21                 | push                0x21
            //   8d84242c010000       | lea                 eax, dword ptr [esp + 0x12c]

        $sequence_3 = { 52 8d43fe 50 68???????? 8d0c7570dc4000 51 ff15???????? }
            // n = 7, score = 100
            //   52                   | push                edx
            //   8d43fe               | lea                 eax, dword ptr [ebx - 2]
            //   50                   | push                eax
            //   68????????           |                     
            //   8d0c7570dc4000       | lea                 ecx, dword ptr [esi*2 + 0x40dc70]
            //   51                   | push                ecx
            //   ff15????????         |                     

        $sequence_4 = { 8b1d???????? 899dc4f5ffff 81fb86020000 0f87341a0000 }
            // n = 4, score = 100
            //   8b1d????????         |                     
            //   899dc4f5ffff         | mov                 dword ptr [ebp - 0xa3c], ebx
            //   81fb86020000         | cmp                 ebx, 0x286
            //   0f87341a0000         | ja                  0x1a3a

        $sequence_5 = { 50 ff15???????? 83c410 85c0 7544 c605????????01 eb3b }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   7544                 | jne                 0x46
            //   c605????????01       |                     
            //   eb3b                 | jmp                 0x3d

        $sequence_6 = { 884c3414 46 83c702 3bf3 72e0 5d }
            // n = 6, score = 100
            //   884c3414             | mov                 byte ptr [esp + esi + 0x14], cl
            //   46                   | inc                 esi
            //   83c702               | add                 edi, 2
            //   3bf3                 | cmp                 esi, ebx
            //   72e0                 | jb                  0xffffffe2
            //   5d                   | pop                 ebp

        $sequence_7 = { 894c2474 8b4c246c 33cd 33ca 8b542438 33ca }
            // n = 6, score = 100
            //   894c2474             | mov                 dword ptr [esp + 0x74], ecx
            //   8b4c246c             | mov                 ecx, dword ptr [esp + 0x6c]
            //   33cd                 | xor                 ecx, ebp
            //   33ca                 | xor                 ecx, edx
            //   8b542438             | mov                 edx, dword ptr [esp + 0x38]
            //   33ca                 | xor                 ecx, edx

        $sequence_8 = { 50 6a00 68???????? 51 c744241c04000000 ff15???????? 85c0 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   6a00                 | push                0
            //   68????????           |                     
            //   51                   | push                ecx
            //   c744241c04000000     | mov                 dword ptr [esp + 0x1c], 4
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_9 = { c1eb1b c1e705 0bdf 8bbc2418010000 33ee 03fb 33ea }
            // n = 7, score = 100
            //   c1eb1b               | shr                 ebx, 0x1b
            //   c1e705               | shl                 edi, 5
            //   0bdf                 | or                  ebx, edi
            //   8bbc2418010000       | mov                 edi, dword ptr [esp + 0x118]
            //   33ee                 | xor                 ebp, esi
            //   03fb                 | add                 edi, ebx
            //   33ea                 | xor                 ebp, edx

    condition:
        7 of them and filesize < 8532488
}
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