SYMBOLCOMMON_NAMEaka. SYNONYMS
win.bitsran (Back to overview)

Bitsran

aka: SHADYCAT

Actor(s): Lazarus Group


SHADYCAT is a dropper and spreader component for the HERMES 2.1 RANSOMWARE radical edition.

References
2018-01-29ProofpointDarien Huss
@techreport{huss:20180129:north:438b45d, author = {Darien Huss}, title = {{North Korea Bitten by Bitcoin Bug}}, date = {2018-01-29}, institution = {Proofpoint}, url = {https://www.proofpoint.com/sites/default/files/pfpt-us-wp-north-korea-bitten-by-bitcoin-bug-180129.pdf}, language = {English}, urldate = {2020-01-05} } North Korea Bitten by Bitcoin Bug
Bitsran
2018FireEyeFireEye
@online{fireeye:2018:apt38:20161b7, author = {FireEye}, title = {{APT38}}, date = {2018}, organization = {FireEye}, url = {https://content.fireeye.com/apt/rpt-apt38}, language = {English}, urldate = {2020-01-13} } APT38
Bitsran BLINDTOAD BOOTWRECK Contopee DarkComet DYEPACK HOTWAX NESTEGG PowerRatankba REDSHAWL WORMHOLE Lazarus Group
2017-10-16Sergei Shevchenko, Hirman Muhammad bin Abu Bakar, James Wong
@online{shevchenko:20171016:taiwan:081b125, author = {Sergei Shevchenko and Hirman Muhammad bin Abu Bakar and James Wong}, title = {{Taiwan Heist: Lazarus Tools and Ransomware}}, date = {2017-10-16}, url = {http://baesystemsai.blogspot.de/2017/10/taiwan-heist-lazarus-tools.html}, language = {English}, urldate = {2020-01-07} } Taiwan Heist: Lazarus Tools and Ransomware
Bitsran Hermes
Yara Rules
[TLP:WHITE] win_bitsran_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_bitsran_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.bitsran"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 2bc2 d1f8 0fb7844342020000 83f85c 741b 83f82f }
            // n = 6, score = 100
            //   2bc2                 | sub                 eax, edx
            //   d1f8                 | sar                 eax, 1
            //   0fb7844342020000     | movzx               eax, word ptr [ebx + eax*2 + 0x242]
            //   83f85c               | cmp                 eax, 0x5c
            //   741b                 | je                  0x1d
            //   83f82f               | cmp                 eax, 0x2f

        $sequence_1 = { 51 52 ff15???????? 8b4510 8b4df0 }
            // n = 5, score = 100
            //   51                   | push                ecx
            //   52                   | push                edx
            //   ff15????????         |                     
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]

        $sequence_2 = { 85c0 7403 8975fc 837dfc00 }
            // n = 4, score = 100
            //   85c0                 | test                eax, eax
            //   7403                 | je                  5
            //   8975fc               | mov                 dword ptr [ebp - 4], esi
            //   837dfc00             | cmp                 dword ptr [ebp - 4], 0

        $sequence_3 = { 2b0b 6afd 014b08 895304 8b5508 53 }
            // n = 6, score = 100
            //   2b0b                 | sub                 ecx, dword ptr [ebx]
            //   6afd                 | push                -3
            //   014b08               | add                 dword ptr [ebx + 8], ecx
            //   895304               | mov                 dword ptr [ebx + 4], edx
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   53                   | push                ebx

        $sequence_4 = { 2bd9 0fb64811 89480c 8b4818 894808 c70003000000 eb03 }
            // n = 7, score = 100
            //   2bd9                 | sub                 ebx, ecx
            //   0fb64811             | movzx               ecx, byte ptr [eax + 0x11]
            //   89480c               | mov                 dword ptr [eax + 0xc], ecx
            //   8b4818               | mov                 ecx, dword ptr [eax + 0x18]
            //   894808               | mov                 dword ptr [eax + 8], ecx
            //   c70003000000         | mov                 dword ptr [eax], 3
            //   eb03                 | jmp                 5

        $sequence_5 = { 83c410 85f6 7f12 8b07 50 }
            // n = 5, score = 100
            //   83c410               | add                 esp, 0x10
            //   85f6                 | test                esi, esi
            //   7f12                 | jg                  0x14
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   50                   | push                eax

        $sequence_6 = { 3bd8 72cd 8b0c8520454100 234d08 8b45fc }
            // n = 5, score = 100
            //   3bd8                 | cmp                 ebx, eax
            //   72cd                 | jb                  0xffffffcf
            //   8b0c8520454100       | mov                 ecx, dword ptr [eax*4 + 0x414520]
            //   234d08               | and                 ecx, dword ptr [ebp + 8]
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_7 = { 6a00 ff15???????? 85c0 7514 8d95fcfbffff 68???????? 52 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7514                 | jne                 0x16
            //   8d95fcfbffff         | lea                 edx, [ebp - 0x404]
            //   68????????           |                     
            //   52                   | push                edx

        $sequence_8 = { 8b7508 3bf0 745a 83f8ff 740b 8b07 50 }
            // n = 7, score = 100
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   3bf0                 | cmp                 esi, eax
            //   745a                 | je                  0x5c
            //   83f8ff               | cmp                 eax, -1
            //   740b                 | je                  0xd
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   50                   | push                eax

        $sequence_9 = { 0145fc 2945f8 014508 2945f0 83c40c 294604 }
            // n = 6, score = 100
            //   0145fc               | add                 dword ptr [ebp - 4], eax
            //   2945f8               | sub                 dword ptr [ebp - 8], eax
            //   014508               | add                 dword ptr [ebp + 8], eax
            //   2945f0               | sub                 dword ptr [ebp - 0x10], eax
            //   83c40c               | add                 esp, 0xc
            //   294604               | sub                 dword ptr [esi + 4], eax

    condition:
        7 of them and filesize < 344064
}
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