SYMBOLCOMMON_NAMEaka. SYNONYMS
win.zlob (Back to overview)

Zlob


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References
2020-08-23Nullteilerfrei BlogLars Wallenborn
@online{wallenborn:20200823:programmatically:e6fd043, author = {Lars Wallenborn}, title = {{Programmatically NOP the Current Selection in Ghidra}}, date = {2020-08-23}, organization = {Nullteilerfrei Blog}, url = {https://blag.nullteilerfrei.de/2020/08/23/programmatically-nop-the-current-selection-in-ghidra/}, language = {English}, urldate = {2020-08-24} } Programmatically NOP the Current Selection in Ghidra
Zlob
2020-03WikipediaWikipedia
@online{wikipedia:202003:zlob:f921cd7, author = {Wikipedia}, title = {{Zlob trojan}}, date = {2020-03}, organization = {Wikipedia}, url = {https://en.wikipedia.org/wiki/Zlob_trojan}, language = {English}, urldate = {2020-12-14} } Zlob trojan
Zlob
Yara Rules
[TLP:WHITE] win_zlob_auto (20220411 | Detects win.zlob.)
rule win_zlob_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.zlob."
        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.zlob"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 8b09 8344241424 891481 40 3b430c }
            // n = 5, score = 200
            //   8b09                 | mov                 ecx, dword ptr [ecx]
            //   8344241424           | add                 dword ptr [esp + 0x14], 0x24
            //   891481               | mov                 dword ptr [ecx + eax*4], edx
            //   40                   | inc                 eax
            //   3b430c               | cmp                 eax, dword ptr [ebx + 0xc]

        $sequence_1 = { 7504 4f 4f 4b 4b 8b45ec 8d4801 }
            // n = 7, score = 200
            //   7504                 | jne                 6
            //   4f                   | dec                 edi
            //   4f                   | dec                 edi
            //   4b                   | dec                 ebx
            //   4b                   | dec                 ebx
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   8d4801               | lea                 ecx, dword ptr [eax + 1]

        $sequence_2 = { ff750c ffd6 33c0 384514 6aff ff750c }
            // n = 6, score = 200
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ffd6                 | call                esi
            //   33c0                 | xor                 eax, eax
            //   384514               | cmp                 byte ptr [ebp + 0x14], al
            //   6aff                 | push                -1
            //   ff750c               | push                dword ptr [ebp + 0xc]

        $sequence_3 = { c685e8feffff6f c685e9feffff67 c685eafeffff6f c685ebfeffff6e 889decfeffff ff15???????? 3bc3 }
            // n = 7, score = 200
            //   c685e8feffff6f       | mov                 byte ptr [ebp - 0x118], 0x6f
            //   c685e9feffff67       | mov                 byte ptr [ebp - 0x117], 0x67
            //   c685eafeffff6f       | mov                 byte ptr [ebp - 0x116], 0x6f
            //   c685ebfeffff6e       | mov                 byte ptr [ebp - 0x115], 0x6e
            //   889decfeffff         | mov                 byte ptr [ebp - 0x114], bl
            //   ff15????????         |                     
            //   3bc3                 | cmp                 eax, ebx

        $sequence_4 = { 6a00 ff742418 ff7500 ff15???????? 8b4510 3b450c 8944241c }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   ff742418             | push                dword ptr [esp + 0x18]
            //   ff7500               | push                dword ptr [ebp]
            //   ff15????????         |                     
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   3b450c               | cmp                 eax, dword ptr [ebp + 0xc]
            //   8944241c             | mov                 dword ptr [esp + 0x1c], eax

        $sequence_5 = { e8???????? 33d8 83c444 53 ff7508 83c708 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   33d8                 | xor                 ebx, eax
            //   83c444               | add                 esp, 0x44
            //   53                   | push                ebx
            //   ff7508               | push                dword ptr [ebp + 8]
            //   83c708               | add                 edi, 8

        $sequence_6 = { 50 e8???????? 8364242c00 85c0 59 89442430 0f8e60020000 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   8364242c00           | and                 dword ptr [esp + 0x2c], 0
            //   85c0                 | test                eax, eax
            //   59                   | pop                 ecx
            //   89442430             | mov                 dword ptr [esp + 0x30], eax
            //   0f8e60020000         | jle                 0x266

        $sequence_7 = { 8a45ff 5e 5b c9 c3 83ec0c 83242400 }
            // n = 7, score = 200
            //   8a45ff               | mov                 al, byte ptr [ebp - 1]
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   c9                   | leave               
            //   c3                   | ret                 
            //   83ec0c               | sub                 esp, 0xc
            //   83242400             | and                 dword ptr [esp], 0

        $sequence_8 = { 6a01 68???????? 8bc8 e8???????? a3???????? }
            // n = 5, score = 200
            //   6a01                 | push                1
            //   68????????           |                     
            //   8bc8                 | mov                 ecx, eax
            //   e8????????           |                     
            //   a3????????           |                     

        $sequence_9 = { ffb42418010000 ff15???????? 50 68???????? }
            // n = 4, score = 200
            //   ffb42418010000       | push                dword ptr [esp + 0x118]
            //   ff15????????         |                     
            //   50                   | push                eax
            //   68????????           |                     

    condition:
        7 of them and filesize < 98304
}
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