win.torrentlocker (Back to overview)

TorrentLocker


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References
2014-09-11 ⋅ BleepingComputer ForumsDecrypterFixer
@online{decrypterfixer:20140911:torrentlocker:10d80ec, author = {DecrypterFixer}, title = {{TorrentLocker Ransomware Cracked and Decrypter has been made}}, date = {2014-09-11}, organization = {BleepingComputer Forums}, url = {http://www.bleepingcomputer.com/forums/t/547708/torrentlocker-ransomware-cracked-and-decrypter-has-been-made/}, language = {English}, urldate = {2020-01-06} } TorrentLocker Ransomware Cracked and Decrypter has been made
TorrentLocker
Yara Rules
[TLP:WHITE] win_torrentlocker_auto (20190204 | autogenerated rule brought to you by yara-signator)
rule win_torrentlocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2019-11-26"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator 0.1a"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.torrentlocker"
        malpedia_version = "20190204"
        malpedia_license = "CC BY-NC-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 / approach will be published in the near future 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 = { 8965e8 c745fc00000000 6800000900 e8???????? }
            // n = 4, score = 300
            //   8965e8               | mov                 dword ptr [ebp - 0x18], esp
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   6800000900           | push                0x90000
            //   e8????????           |                     

        $sequence_1 = { 51 6a01 6a00 0d00800000 }
            // n = 4, score = 300
            //   51                   | push                ecx
            //   6a01                 | push                1
            //   6a00                 | push                0
            //   0d00800000           | or                  eax, 0x8000

        $sequence_2 = { 64a300000000 8965e8 c745fc00000000 6800000900 e8???????? }
            // n = 5, score = 300
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8965e8               | mov                 dword ptr [ebp - 0x18], esp
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   6800000900           | push                0x90000
            //   e8????????           |                     

        $sequence_3 = { 2d00000900 50 6800000900 e8???????? 83c408 85c0 743a }
            // n = 7, score = 300
            //   2d00000900           | sub                 eax, 0x90000
            //   50                   | push                eax
            //   6800000900           | push                0x90000
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   743a                 | je                  0x3c

        $sequence_4 = { 85c0 7ff4 5f 33c0 5e c3 }
            // n = 6, score = 300
            //   85c0                 | test                eax, eax
            //   7ff4                 | jg                  0xfffffff6
            //   5f                   | pop                 edi
            //   33c0                 | xor                 eax, eax
            //   5e                   | pop                 esi
            //   c3                   | ret                 

        $sequence_5 = { 64a300000000 8965e8 c745fc00000000 6800000900 e8???????? 83c404 }
            // n = 6, score = 300
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8965e8               | mov                 dword ptr [ebp - 0x18], esp
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   6800000900           | push                0x90000
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_6 = { c745fc00000000 6800000900 e8???????? 83c404 85c0 7454 8b4508 }
            // n = 7, score = 300
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   6800000900           | push                0x90000
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax
            //   7454                 | je                  0x56
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_7 = { 85c0 7514 e8???????? 3d00000600 1bc0 40 }
            // n = 6, score = 300
            //   85c0                 | test                eax, eax
            //   7514                 | jne                 0x16
            //   e8????????           |                     
            //   3d00000600           | cmp                 eax, 0x60000
            //   1bc0                 | sbb                 eax, eax
            //   40                   | inc                 eax

        $sequence_8 = { 8965e8 c745fc00000000 6800000900 e8???????? 83c404 85c0 }
            // n = 6, score = 300
            //   8965e8               | mov                 dword ptr [ebp - 0x18], esp
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   6800000900           | push                0x90000
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax

        $sequence_9 = { 2d00000900 50 6800000900 e8???????? }
            // n = 4, score = 300
            //   2d00000900           | sub                 eax, 0x90000
            //   50                   | push                eax
            //   6800000900           | push                0x90000
            //   e8????????           |                     

    condition:
        7 of them
}
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