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 (20201023 | autogenerated rule brought to you by yara-signator)
rule win_bitsran_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.bitsran"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 85ff 0f8469010000 83ffff 0f8460010000 8d85c0f6ffff 50 57 }
            // n = 7, score = 100
            //   85ff                 | test                edi, edi
            //   0f8469010000         | je                  0x16f
            //   83ffff               | cmp                 edi, -1
            //   0f8460010000         | je                  0x166
            //   8d85c0f6ffff         | lea                 eax, [ebp - 0x940]
            //   50                   | push                eax
            //   57                   | push                edi

        $sequence_1 = { 8b55f4 57 03c8 51 }
            // n = 4, score = 100
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   57                   | push                edi
            //   03c8                 | add                 ecx, eax
            //   51                   | push                ecx

        $sequence_2 = { b808400000 e8???????? a1???????? 33c5 8945fc e8???????? 8d85f8bfffff }
            // n = 7, score = 100
            //   b808400000           | mov                 eax, 0x4008
            //   e8????????           |                     
            //   a1????????           |                     
            //   33c5                 | xor                 eax, ebp
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   e8????????           |                     
            //   8d85f8bfffff         | lea                 eax, [ebp - 0x4008]

        $sequence_3 = { 85f6 740a 8b85f4feffff 56 50 eb3a 8b0d???????? }
            // n = 7, score = 100
            //   85f6                 | test                esi, esi
            //   740a                 | je                  0xc
            //   8b85f4feffff         | mov                 eax, dword ptr [ebp - 0x10c]
            //   56                   | push                esi
            //   50                   | push                eax
            //   eb3a                 | jmp                 0x3c
            //   8b0d????????         |                     

        $sequence_4 = { 894de8 3bf9 733b b901000000 8d4900 }
            // n = 5, score = 100
            //   894de8               | mov                 dword ptr [ebp - 0x18], ecx
            //   3bf9                 | cmp                 edi, ecx
            //   733b                 | jae                 0x3d
            //   b901000000           | mov                 ecx, 1
            //   8d4900               | lea                 ecx, [ecx]

        $sequence_5 = { 52 8985d0fcffff ff15???????? 8b85d8fcffff 8b8ddcfcffff }
            // n = 5, score = 100
            //   52                   | push                edx
            //   8985d0fcffff         | mov                 dword ptr [ebp - 0x330], eax
            //   ff15????????         |                     
            //   8b85d8fcffff         | mov                 eax, dword ptr [ebp - 0x328]
            //   8b8ddcfcffff         | mov                 ecx, dword ptr [ebp - 0x324]

        $sequence_6 = { c70104000000 e9???????? a840 0f84b9feffff 8b45fc }
            // n = 5, score = 100
            //   c70104000000         | mov                 dword ptr [ecx], 4
            //   e9????????           |                     
            //   a840                 | test                al, 0x40
            //   0f84b9feffff         | je                  0xfffffebf
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_7 = { 0bc2 c7451000000000 89450c 83ff03 72cd 8bc8 83e107 }
            // n = 7, score = 100
            //   0bc2                 | or                  eax, edx
            //   c7451000000000       | mov                 dword ptr [ebp + 0x10], 0
            //   89450c               | mov                 dword ptr [ebp + 0xc], eax
            //   83ff03               | cmp                 edi, 3
            //   72cd                 | jb                  0xffffffcf
            //   8bc8                 | mov                 ecx, eax
            //   83e107               | and                 ecx, 7

        $sequence_8 = { 5d c3 c7450800000000 8b5d08 eb08 8b461c 894508 }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   c7450800000000       | mov                 dword ptr [ebp + 8], 0
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   eb08                 | jmp                 0xa
            //   8b461c               | mov                 eax, dword ptr [esi + 0x1c]
            //   894508               | mov                 dword ptr [ebp + 8], eax

        $sequence_9 = { 83f85c 740c 6685c0 7427 668379023a 7520 51 }
            // n = 7, score = 100
            //   83f85c               | cmp                 eax, 0x5c
            //   740c                 | je                  0xe
            //   6685c0               | test                ax, ax
            //   7427                 | je                  0x29
            //   668379023a           | cmp                 word ptr [ecx + 2], 0x3a
            //   7520                 | jne                 0x22
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 344064
}
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