SYMBOLCOMMON_NAMEaka. SYNONYMS
win.makloader (Back to overview)

MakLoader

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References
2018-10-01Twitter (@James_inthe_box)James_inthe_box
@online{jamesinthebox:20181001:dga:c78b3d8, author = {James_inthe_box}, title = {{Tweet on DGA using TLD xyz}}, date = {2018-10-01}, organization = {Twitter (@James_inthe_box)}, url = {https://twitter.com/James_inthe_box/status/1046844087469391872}, language = {English}, urldate = {2020-01-08} } Tweet on DGA using TLD xyz
MakLoader
Yara Rules
[TLP:WHITE] win_makloader_auto (20220808 | Detects win.makloader.)
rule win_makloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.makloader."
        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.makloader"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 894df8 c745fc00000000 eb09 8b45fc 83c001 8945fc 837dfc42 }
            // n = 7, score = 200
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   eb09                 | jmp                 0xb
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   83c001               | add                 eax, 1
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   837dfc42             | cmp                 dword ptr [ebp - 4], 0x42

        $sequence_1 = { eb09 8b45fc 83c001 8945fc 837dfc02 7332 8b4dfc }
            // n = 7, score = 200
            //   eb09                 | jmp                 0xb
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   83c001               | add                 eax, 1
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   837dfc02             | cmp                 dword ptr [ebp - 4], 2
            //   7332                 | jae                 0x34
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_2 = { 6bc215 8b4d08 0fb61401 52 }
            // n = 4, score = 200
            //   6bc215               | imul                eax, edx, 0x15
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   0fb61401             | movzx               edx, byte ptr [ecx + eax]
            //   52                   | push                edx

        $sequence_3 = { e8???????? 8bca ba08000000 c1e202 898500fdffff }
            // n = 5, score = 200
            //   e8????????           |                     
            //   8bca                 | mov                 ecx, edx
            //   ba08000000           | mov                 edx, 8
            //   c1e202               | shl                 edx, 2
            //   898500fdffff         | mov                 dword ptr [ebp - 0x300], eax

        $sequence_4 = { e8???????? 83c404 ba01000000 6bca03 8b5508 0fbe0c0a 33c1 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   ba01000000           | mov                 edx, 1
            //   6bca03               | imul                ecx, edx, 3
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   0fbe0c0a             | movsx               ecx, byte ptr [edx + ecx]
            //   33c1                 | xor                 eax, ecx

        $sequence_5 = { 8b84d108010000 8b94d10c010000 b118 e8???????? 8b55f8 8b4d08 8844d104 }
            // n = 7, score = 200
            //   8b84d108010000       | mov                 eax, dword ptr [ecx + edx*8 + 0x108]
            //   8b94d10c010000       | mov                 edx, dword ptr [ecx + edx*8 + 0x10c]
            //   b118                 | mov                 cl, 0x18
            //   e8????????           |                     
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8844d104             | mov                 byte ptr [ecx + edx*8 + 4], al

        $sequence_6 = { 68???????? e8???????? 83c404 83f0ff 50 0fb685ede5ffff }
            // n = 6, score = 200
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   83f0ff               | xor                 eax, 0xffffffff
            //   50                   | push                eax
            //   0fb685ede5ffff       | movzx               eax, byte ptr [ebp - 0x1a13]

        $sequence_7 = { 03148d885d4200 8b00 894218 8a441f04 884228 8b45fc 47 }
            // n = 7, score = 200
            //   03148d885d4200       | add                 edx, dword ptr [ecx*4 + 0x425d88]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   894218               | mov                 dword ptr [edx + 0x18], eax
            //   8a441f04             | mov                 al, byte ptr [edi + ebx + 4]
            //   884228               | mov                 byte ptr [edx + 0x28], al
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   47                   | inc                 edi

        $sequence_8 = { 894604 c7460c000e0000 c7461078d14100 e8???????? 85c0 791c ff15???????? }
            // n = 7, score = 200
            //   894604               | mov                 dword ptr [esi + 4], eax
            //   c7460c000e0000       | mov                 dword ptr [esi + 0xc], 0xe00
            //   c7461078d14100       | mov                 dword ptr [esi + 0x10], 0x41d178
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   791c                 | jns                 0x1e
            //   ff15????????         |                     

        $sequence_9 = { 52 e8???????? 83c40c 8b450c 83c003 89450c }
            // n = 6, score = 200
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   83c003               | add                 eax, 3
            //   89450c               | mov                 dword ptr [ebp + 0xc], eax

    condition:
        7 of them and filesize < 335872
}
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