SYMBOLCOMMON_NAMEaka. SYNONYMS
win.elirks (Back to overview)

Elirks


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References
2016-09-15Palo Alto Networks Unit 42Kaoru Hayashi
@online{hayashi:20160915:mile:302680e, author = {Kaoru Hayashi}, title = {{MILE TEA: Cyber Espionage Campaign Targets Asia Pacific Businesses and Government Agencies}}, date = {2016-09-15}, organization = {Palo Alto Networks Unit 42}, url = {https://researchcenter.paloaltonetworks.com/2016/09/mile-tea-cyber-espionage-campaign-targets-asia-pacific-businesses-and-government-agencies/}, language = {English}, urldate = {2019-12-20} } MILE TEA: Cyber Espionage Campaign Targets Asia Pacific Businesses and Government Agencies
Elirks Logedrut Micrass
Yara Rules
[TLP:WHITE] win_elirks_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_elirks_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.elirks"
        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 = { 68???????? 56 ff15???????? 8bf8 3bfb 897c2420 }
            // n = 6, score = 100
            //   68????????           |                     
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax
            //   3bfb                 | cmp                 edi, ebx
            //   897c2420             | mov                 dword ptr [esp + 0x20], edi

        $sequence_1 = { f7ea 8bc2 c1e81f 03c2 03c0 03c0 85c9 }
            // n = 7, score = 100
            //   f7ea                 | imul                edx
            //   8bc2                 | mov                 eax, edx
            //   c1e81f               | shr                 eax, 0x1f
            //   03c2                 | add                 eax, edx
            //   03c0                 | add                 eax, eax
            //   03c0                 | add                 eax, eax
            //   85c9                 | test                ecx, ecx

        $sequence_2 = { 8b4c2408 8d742410 e8???????? 8d742408 e8???????? 5f 5e }
            // n = 7, score = 100
            //   8b4c2408             | mov                 ecx, dword ptr [esp + 8]
            //   8d742410             | lea                 esi, [esp + 0x10]
            //   e8????????           |                     
            //   8d742408             | lea                 esi, [esp + 8]
            //   e8????????           |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_3 = { 51 ff15???????? c744240801000080 8b54240c 52 ff15???????? }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   c744240801000080     | mov                 dword ptr [esp + 8], 0x80000001
            //   8b54240c             | mov                 edx, dword ptr [esp + 0xc]
            //   52                   | push                edx
            //   ff15????????         |                     

        $sequence_4 = { 8d942424030000 52 bf???????? e8???????? 83c410 85c0 7448 }
            // n = 7, score = 100
            //   8d942424030000       | lea                 edx, [esp + 0x324]
            //   52                   | push                edx
            //   bf????????           |                     
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   7448                 | je                  0x4a

        $sequence_5 = { 8b4c2418 6bf64c 03f3 8bc6 8b10 8911 8b5004 }
            // n = 7, score = 100
            //   8b4c2418             | mov                 ecx, dword ptr [esp + 0x18]
            //   6bf64c               | imul                esi, esi, 0x4c
            //   03f3                 | add                 esi, ebx
            //   8bc6                 | mov                 eax, esi
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   8911                 | mov                 dword ptr [ecx], edx
            //   8b5004               | mov                 edx, dword ptr [eax + 4]

        $sequence_6 = { c7861860000007010200 c744240c10000000 ff15???????? 8b442404 8d542404 }
            // n = 5, score = 100
            //   c7861860000007010200     | mov    dword ptr [esi + 0x6018], 0x20107
            //   c744240c10000000     | mov                 dword ptr [esp + 0xc], 0x10
            //   ff15????????         |                     
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   8d542404             | lea                 edx, [esp + 4]

        $sequence_7 = { 83c501 83fd1a 0f8c5fffffff 5f }
            // n = 4, score = 100
            //   83c501               | add                 ebp, 1
            //   83fd1a               | cmp                 ebp, 0x1a
            //   0f8c5fffffff         | jl                  0xffffff65
            //   5f                   | pop                 edi

        $sequence_8 = { 2bd1 8d4aff 85c9 8908 7e28 8b4c241c }
            // n = 6, score = 100
            //   2bd1                 | sub                 edx, ecx
            //   8d4aff               | lea                 ecx, [edx - 1]
            //   85c9                 | test                ecx, ecx
            //   8908                 | mov                 dword ptr [eax], ecx
            //   7e28                 | jle                 0x2a
            //   8b4c241c             | mov                 ecx, dword ptr [esp + 0x1c]

        $sequence_9 = { 51 ff15???????? 55 6800010000 6a02 55 6a01 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   55                   | push                ebp
            //   6800010000           | push                0x100
            //   6a02                 | push                2
            //   55                   | push                ebp
            //   6a01                 | push                1

    condition:
        7 of them and filesize < 81920
}
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