elf.bashlite (Back to overview)

Bashlite

aka: gayfgt, Gafgyt, qbot, torlus, lizkebab
URLhaus        

There is no description at this point.

References
2016-09-21 ⋅ Brian Krebs
@online{krebs:20160921:krebsonsecurity:259c3cd, author = {Brian Krebs}, title = {{KrebsOnSecurity Hit With Record DDoS}}, date = {2016-09-21}, url = {https://krebsonsecurity.com/2016/09/krebsonsecurity-hit-with-record-ddos/}, language = {English}, urldate = {2019-12-18} } KrebsOnSecurity Hit With Record DDoS
Bashlite
2014-11-13 ⋅ Trend MicroRhena Inocencio
@online{inocencio:20141113:bashlite:647137b, author = {Rhena Inocencio}, title = {{BASHLITE Affects Devices Running on BusyBox}}, date = {2014-11-13}, organization = {Trend Micro}, url = {http://blog.trendmicro.com/trendlabs-security-intelligence/bashlite-affects-devices-running-on-busybox/}, language = {English}, urldate = {2019-07-10} } BASHLITE Affects Devices Running on BusyBox
Bashlite
Yara Rules
[TLP:WHITE] elf_bashlite_auto (20190204 | autogenerated rule brought to you by yara-signator)
rule elf_bashlite_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/elf.bashlite"
        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 = { 85c0 750c c785ecefffff01000000 eb0a c785ecefffff00000000 }
            // n = 5, score = 300
            //   85c0                 | test                eax, eax
            //   750c                 | jne                 0xe
            //   c785ecefffff01000000     | mov    dword ptr [ebp - 0x1014], 1
            //   eb0a                 | jmp                 0xc
            //   c785ecefffff00000000     | mov    dword ptr [ebp - 0x1014], 0

        $sequence_1 = { 750c c785ecefffff01000000 eb0a c785ecefffff00000000 8b85ecefffff c9 }
            // n = 6, score = 300
            //   750c                 | jne                 0xe
            //   c785ecefffff01000000     | mov    dword ptr [ebp - 0x1014], 1
            //   eb0a                 | jmp                 0xc
            //   c785ecefffff00000000     | mov    dword ptr [ebp - 0x1014], 0
            //   8b85ecefffff         | mov                 eax, dword ptr [ebp - 0x1014]
            //   c9                   | leave               

        $sequence_2 = { c785ecefffff01000000 eb0a c785ecefffff00000000 8b85ecefffff c9 c3 55 }
            // n = 7, score = 300
            //   c785ecefffff01000000     | mov    dword ptr [ebp - 0x1014], 1
            //   eb0a                 | jmp                 0xc
            //   c785ecefffff00000000     | mov    dword ptr [ebp - 0x1014], 0
            //   8b85ecefffff         | mov                 eax, dword ptr [ebp - 0x1014]
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_3 = { 894210 c9 c3 55 }
            // n = 4, score = 300
            //   894210               | mov                 dword ptr [edx + 0x10], eax
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_4 = { eb0d e8???????? c70061000000 31d2 }
            // n = 4, score = 300
            //   eb0d                 | jmp                 0xf
            //   e8????????           |                     
            //   c70061000000         | mov                 dword ptr [eax], 0x61
            //   31d2                 | xor                 edx, edx

        $sequence_5 = { 8b85ecefffff c9 c3 55 }
            // n = 4, score = 300
            //   8b85ecefffff         | mov                 eax, dword ptr [ebp - 0x1014]
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_6 = { eb0a c785ecefffff00000000 8b85ecefffff c9 c3 55 }
            // n = 6, score = 300
            //   eb0a                 | jmp                 0xc
            //   c785ecefffff00000000     | mov    dword ptr [ebp - 0x1014], 0
            //   8b85ecefffff         | mov                 eax, dword ptr [ebp - 0x1014]
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_7 = { e8???????? 89c2 89d0 c1e81f 01d0 d1f8 }
            // n = 6, score = 300
            //   e8????????           |                     
            //   89c2                 | mov                 edx, eax
            //   89d0                 | mov                 eax, edx
            //   c1e81f               | shr                 eax, 0x1f
            //   01d0                 | add                 eax, edx
            //   d1f8                 | sar                 eax, 1

        $sequence_8 = { e8???????? 89c2 89d0 c1e81f }
            // n = 4, score = 300
            //   e8????????           |                     
            //   89c2                 | mov                 edx, eax
            //   89d0                 | mov                 eax, edx
            //   c1e81f               | shr                 eax, 0x1f

        $sequence_9 = { 21d0 3345fc c9 c3 55 }
            // n = 5, score = 300
            //   21d0                 | and                 eax, edx
            //   3345fc               | xor                 eax, dword ptr [ebp - 4]
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp

    condition:
        7 of them
}
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