SYMBOLCOMMON_NAMEaka. SYNONYMS
win.underminer_ek (Back to overview)

UnderminerEK


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References
2022-01-12AvastJan Vojtěšek
@online{vojtek:20220112:exploit:479fe11, author = {Jan Vojtěšek}, title = {{Exploit Kits vs. Google Chrome}}, date = {2022-01-12}, organization = {Avast}, url = {https://decoded.avast.io/janvojtesek/exploit-kits-vs-google-chrome/}, language = {English}, urldate = {2022-07-01} } Exploit Kits vs. Google Chrome
Magniber UnderminerEK
2021-11-02MinervaNatalie Zargarov
@online{zargarov:20211102:underminer:f03f426, author = {Natalie Zargarov}, title = {{Underminer Exploit Kit: The More You Check The More Evasive You Become}}, date = {2021-11-02}, organization = {Minerva}, url = {https://blog.minerva-labs.com/underminer-exploit-kit-the-more-you-check-the-more-evasive-you-become}, language = {English}, urldate = {2021-11-03} } Underminer Exploit Kit: The More You Check The More Evasive You Become
Amadey Oski Stealer RedLine Stealer UnderminerEK
Yara Rules
[TLP:WHITE] win_underminer_ek_auto (20220516 | Detects win.underminer_ek.)
rule win_underminer_ek_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.underminer_ek."
        info = "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.underminer_ek"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 0303 50 e8???????? 837e1410 7205 8b36 8975fc }
            // n = 7, score = 100
            //   0303                 | add                 eax, dword ptr [ebx]
            //   50                   | push                eax
            //   e8????????           |                     
            //   837e1410             | cmp                 dword ptr [esi + 0x14], 0x10
            //   7205                 | jb                  7
            //   8b36                 | mov                 esi, dword ptr [esi]
            //   8975fc               | mov                 dword ptr [ebp - 4], esi

        $sequence_1 = { 0305???????? 5f 03c1 0115???????? }
            // n = 4, score = 100
            //   0305????????         |                     
            //   5f                   | pop                 edi
            //   03c1                 | add                 eax, ecx
            //   0115????????         |                     

        $sequence_2 = { ff75f8 56 53 e8???????? 83c414 5f }
            // n = 6, score = 100
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   56                   | push                esi
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   5f                   | pop                 edi

        $sequence_3 = { 684e34fa7e ff7508 53 e8???????? 83c410 85c0 750c }
            // n = 7, score = 100
            //   684e34fa7e           | push                0x7efa344e
            //   ff7508               | push                dword ptr [ebp + 8]
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   750c                 | jne                 0xe

        $sequence_4 = { 0135???????? 33c2 8d9335f23abd 0345d8 }
            // n = 4, score = 100
            //   0135????????         |                     
            //   33c2                 | xor                 eax, edx
            //   8d9335f23abd         | lea                 edx, [ebx - 0x42c50dcb]
            //   0345d8               | add                 eax, dword ptr [ebp - 0x28]

        $sequence_5 = { 7404 3bc1 7501 48 }
            // n = 4, score = 100
            //   7404                 | je                  6
            //   3bc1                 | cmp                 eax, ecx
            //   7501                 | jne                 3
            //   48                   | dec                 eax

        $sequence_6 = { 03048d582c4300 eb05 b8???????? f6402820 }
            // n = 4, score = 100
            //   03048d582c4300       | add                 eax, dword ptr [ecx*4 + 0x432c58]
            //   eb05                 | jmp                 7
            //   b8????????           |                     
            //   f6402820             | test                byte ptr [eax + 0x28], 0x20

        $sequence_7 = { 3bc5 7547 3b6b04 7242 }
            // n = 4, score = 100
            //   3bc5                 | cmp                 eax, ebp
            //   7547                 | jne                 0x49
            //   3b6b04               | cmp                 ebp, dword ptr [ebx + 4]
            //   7242                 | jb                  0x44

        $sequence_8 = { e8???????? 83c40c 8b4d08 03de 3b4d0c }
            // n = 5, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   03de                 | add                 ebx, esi
            //   3b4d0c               | cmp                 ecx, dword ptr [ebp + 0xc]

        $sequence_9 = { 03048d582c4300 50 ff15???????? 5d }
            // n = 4, score = 100
            //   03048d582c4300       | add                 eax, dword ptr [ecx*4 + 0x432c58]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   5d                   | pop                 ebp

        $sequence_10 = { 8907 59 895704 e9???????? }
            // n = 4, score = 100
            //   8907                 | mov                 dword ptr [edi], eax
            //   59                   | pop                 ecx
            //   895704               | mov                 dword ptr [edi + 4], edx
            //   e9????????           |                     

        $sequence_11 = { 895df4 e8???????? 85c0 59 742b }
            // n = 5, score = 100
            //   895df4               | mov                 dword ptr [ebp - 0xc], ebx
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   59                   | pop                 ecx
            //   742b                 | je                  0x2d

        $sequence_12 = { 0f8537010000 0fb74614 6a40 6800101000 ff7650 }
            // n = 5, score = 100
            //   0f8537010000         | jne                 0x13d
            //   0fb74614             | movzx               eax, word ptr [esi + 0x14]
            //   6a40                 | push                0x40
            //   6800101000           | push                0x101000
            //   ff7650               | push                dword ptr [esi + 0x50]

        $sequence_13 = { 03148d582c4300 8b00 894218 8a441f04 }
            // n = 4, score = 100
            //   03148d582c4300       | add                 edx, dword ptr [ecx*4 + 0x432c58]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   894218               | mov                 dword ptr [edx + 0x18], eax
            //   8a441f04             | mov                 al, byte ptr [edi + ebx + 4]

        $sequence_14 = { 010d???????? 0bf1 33f2 0375d4 }
            // n = 4, score = 100
            //   010d????????         |                     
            //   0bf1                 | or                  esi, ecx
            //   33f2                 | xor                 esi, edx
            //   0375d4               | add                 esi, dword ptr [ebp - 0x2c]

    condition:
        7 of them and filesize < 466944
}
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