win.torrentlocker (Back to overview)

TorrentLocker


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References
http://www.bleepingcomputer.com/forums/t/547708/torrentlocker-ransomware-cracked-and-decrypter-has-been-made/
http://www.isightpartners.com/2014/08/analysis-torrentlocker-new-strain-malware-using-components-cryptolocker-cryptowall/
Yara Rules
[TLP:WHITE] win_torrentlocker_auto (20190620 | autogenerated rule brought to you by yara-signator)
rule win_torrentlocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2019-07-05"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator 0.2a"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.torrentlocker"
        malpedia_version = "20190620"
        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 / approach 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 = { 33ff 893d???????? 85ff 74?? }
            // n = 4, score = 500
            //   33ff                 | xor                 edi, edi
            //   893d????????         |                     
            //   85ff                 | test                edi, edi
            //   74??                 |                     

        $sequence_1 = { 33d2 0fb6c0 f6c101 75?? }
            // n = 4, score = 500
            //   33d2                 | xor                 edx, edx
            //   0fb6c0               | movzx               eax, al
            //   f6c101               | test                cl, 1
            //   75??                 |                     

        $sequence_2 = { 75?? 85c0 74?? c705???????????????? }
            // n = 4, score = 500
            //   75??                 |                     
            //   85c0                 | test                eax, eax
            //   74??                 |                     
            //   c705????????????????     |     

        $sequence_3 = { 33d2 0fb6c0 f6c101 75?? }
            // n = 4, score = 500
            //   33d2                 | xor                 edx, edx
            //   0fb6c0               | movzx               eax, al
            //   f6c101               | test                cl, 1
            //   75??                 |                     

        $sequence_4 = { 33ff 893d???????? 85ff 74?? }
            // n = 4, score = 500
            //   33ff                 | xor                 edi, edi
            //   893d????????         |                     
            //   85ff                 | test                edi, edi
            //   74??                 |                     

        $sequence_5 = { 75?? 85c0 74?? c705???????????????? }
            // n = 4, score = 500
            //   75??                 |                     
            //   85c0                 | test                eax, eax
            //   74??                 |                     
            //   c705????????????????     |     

        $sequence_6 = { 0fb711 6689140e 83c102 6685d2 75?? 8bcf }
            // n = 6, score = 400
            //   0fb711               | movzx               edx, word ptr [ecx]
            //   6689140e             | mov                 word ptr [esi + ecx], dx
            //   83c102               | add                 ecx, 2
            //   6685d2               | test                dx, dx
            //   75??                 |                     
            //   8bcf                 | mov                 ecx, edi

        $sequence_7 = { be06000000 8bc6 5e 5f c3 }
            // n = 5, score = 400
            //   be06000000           | mov                 esi, 6
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi
            //   c3                   | ret                 

        $sequence_8 = { 85c0 75?? e8???????? 3d00000600 1bc0 40 }
            // n = 6, score = 300
            //   85c0                 | test                eax, eax
            //   75??                 |                     
            //   e8????????           |                     
            //   3d00000600           | cmp                 eax, 0x60000
            //   1bc0                 | sbb                 eax, eax
            //   40                   | inc                 eax

        $sequence_9 = { 50 8d45f0 64a300000000 8965e8 c745fc00000000 6800000900 e8???????? }
            // n = 7, score = 300
            //   50                   | push                eax
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   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_10 = { c705???????????????? e8???????? 8bf0 e8???????? 03c6 }
            // n = 5, score = 300
            //   c705????????????????     |     
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     
            //   03c6                 | add                 eax, esi

        $sequence_11 = { 50 6800000900 e8???????? 83c408 85c0 74?? }
            // n = 6, score = 300
            //   50                   | push                eax
            //   6800000900           | push                0x90000
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   74??                 |                     

        $sequence_12 = { 33f6 85ff 74?? 8b04b3 85c0 74?? }
            // n = 6, score = 300
            //   33f6                 | xor                 esi, esi
            //   85ff                 | test                edi, edi
            //   74??                 |                     
            //   8b04b3               | mov                 eax, dword ptr [ebx + esi*4]
            //   85c0                 | test                eax, eax
            //   74??                 |                     

    condition:
        7 of them
}
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