SYMBOLCOMMON_NAMEaka. SYNONYMS
win.ehdevel (Back to overview)

EHDevel


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References
2017-09-01BitdefenderAlexandru Maximciuc, Cristina Vatamanu
@online{maximciuc:20170901:ehdevel:6440974, author = {Alexandru Maximciuc and Cristina Vatamanu}, title = {{EHDevel – The story of a continuously improving advanced threat creation toolkit}}, date = {2017-09-01}, organization = {Bitdefender}, url = {https://labs.bitdefender.com/2017/09/ehdevel-the-story-of-a-continuously-improving-advanced-threat-creation-toolkit/}, language = {English}, urldate = {2019-12-10} } EHDevel – The story of a continuously improving advanced threat creation toolkit
EHDevel
Yara Rules
[TLP:WHITE] win_ehdevel_auto (20220516 | Detects win.ehdevel.)
rule win_ehdevel_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.ehdevel."
        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.ehdevel"
        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 = { 8b4d08 83c404 8bdf e8???????? 8ad8 }
            // n = 5, score = 100
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   83c404               | add                 esp, 4
            //   8bdf                 | mov                 ebx, edi
            //   e8????????           |                     
            //   8ad8                 | mov                 bl, al

        $sequence_1 = { 52 ffd6 57 ffd6 68???????? e8???????? 8b4dfc }
            // n = 7, score = 100
            //   52                   | push                edx
            //   ffd6                 | call                esi
            //   57                   | push                edi
            //   ffd6                 | call                esi
            //   68????????           |                     
            //   e8????????           |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_2 = { d1f8 5e 5d c20400 8bc6 }
            // n = 5, score = 100
            //   d1f8                 | sar                 eax, 1
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   8bc6                 | mov                 eax, esi

        $sequence_3 = { e8???????? 8bce c745fc01000000 e8???????? c745fcffffffff 837de808 720c }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8bce                 | mov                 ecx, esi
            //   c745fc01000000       | mov                 dword ptr [ebp - 4], 1
            //   e8????????           |                     
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff
            //   837de808             | cmp                 dword ptr [ebp - 0x18], 8
            //   720c                 | jb                  0xe

        $sequence_4 = { 5d c3 68???????? e8???????? 83c404 56 e8???????? }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   56                   | push                esi
            //   e8????????           |                     

        $sequence_5 = { e8???????? 8b8c2418080000 83c404 5f 5e 5b }
            // n = 6, score = 100
            //   e8????????           |                     
            //   8b8c2418080000       | mov                 ecx, dword ptr [esp + 0x818]
            //   83c404               | add                 esp, 4
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_6 = { 83e4f8 81ec0c0c0000 a1???????? 33c4 898424080c0000 53 68???????? }
            // n = 7, score = 100
            //   83e4f8               | and                 esp, 0xfffffff8
            //   81ec0c0c0000         | sub                 esp, 0xc0c
            //   a1????????           |                     
            //   33c4                 | xor                 eax, esp
            //   898424080c0000       | mov                 dword ptr [esp + 0xc08], eax
            //   53                   | push                ebx
            //   68????????           |                     

        $sequence_7 = { 750a 68???????? e9???????? 68???????? e8???????? 8b8c2408200000 83c404 }
            // n = 7, score = 100
            //   750a                 | jne                 0xc
            //   68????????           |                     
            //   e9????????           |                     
            //   68????????           |                     
            //   e8????????           |                     
            //   8b8c2408200000       | mov                 ecx, dword ptr [esp + 0x2008]
            //   83c404               | add                 esp, 4

        $sequence_8 = { 52 6800040000 8d442410 68???????? 50 e8???????? 8b8c2420180000 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   6800040000           | push                0x400
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b8c2420180000       | mov                 ecx, dword ptr [esp + 0x1820]

        $sequence_9 = { 8b4614 8985e8f7ffff 895e10 895e14 eb02 33db c645fc03 }
            // n = 7, score = 100
            //   8b4614               | mov                 eax, dword ptr [esi + 0x14]
            //   8985e8f7ffff         | mov                 dword ptr [ebp - 0x818], eax
            //   895e10               | mov                 dword ptr [esi + 0x10], ebx
            //   895e14               | mov                 dword ptr [esi + 0x14], ebx
            //   eb02                 | jmp                 4
            //   33db                 | xor                 ebx, ebx
            //   c645fc03             | mov                 byte ptr [ebp - 4], 3

    condition:
        7 of them and filesize < 524288
}
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