SYMBOLCOMMON_NAMEaka. SYNONYMS
win.lazardoor (Back to overview)

LazarDoor

Actor(s): Lazarus Group


There is no description at this point.

References
2022-10-24AhnLabASEC Analysis Team
@online{team:20221024:malware:495a611, author = {ASEC Analysis Team}, title = {{Malware infection case of Lazarus attack group that neutralizes antivirus program with BYOVD technique}}, date = {2022-10-24}, organization = {AhnLab}, url = {https://asec.ahnlab.com/ko/40495/}, language = {Korean}, urldate = {2022-10-25} } Malware infection case of Lazarus attack group that neutralizes antivirus program with BYOVD technique
LazarDoor
Yara Rules
[TLP:WHITE] win_lazardoor_auto (20230125 | Detects win.lazardoor.)
rule win_lazardoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.lazardoor."
        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.lazardoor"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 7542 8d58b0 498bce 448bc3 488d15b4b50000 e8???????? }
            // n = 6, score = 100
            //   7542                 | dec                 eax
            //   8d58b0               | lea                 edx, [0xca21]
            //   498bce               | dec                 eax
            //   448bc3               | lea                 edx, [0x12db6]
            //   488d15b4b50000       | mov                 ecx, ebx
            //   e8????????           |                     

        $sequence_1 = { 740d 488bc8 49878cff40740200 eb0a 4d87b4ff40740200 33c0 }
            // n = 6, score = 100
            //   740d                 | dec                 eax
            //   488bc8               | lea                 eax, [0x147a6]
            //   49878cff40740200     | dec                 eax
            //   eb0a                 | mov                 ecx, dword ptr [esp + 0x30]
            //   4d87b4ff40740200     | dec                 eax
            //   33c0                 | cmp                 ecx, eax

        $sequence_2 = { 0fb75814 4883c320 66443b7006 733f 4803d8 f7431c00000020 }
            // n = 6, score = 100
            //   0fb75814             | mov                 ebx, eax
            //   4883c320             | dec                 eax
            //   66443b7006           | test                eax, eax
            //   733f                 | je                  0x3fe
            //   4803d8               | mov                 ecx, 0x1fffff
            //   f7431c00000020       | dec                 eax

        $sequence_3 = { 44397e18 7e38 498bdf 0f1f4000 660f1f840000000000 488b4e10 488b040b }
            // n = 7, score = 100
            //   44397e18             | mov                 dword ptr [esp + 0x70], esi
            //   7e38                 | test                eax, eax
            //   498bdf               | jne                 0x36b
            //   0f1f4000             | mov                 dword ptr [esp + 0x40], eax
            //   660f1f840000000000     | jmp    0x3c3
            //   488b4e10             | test                eax, eax
            //   488b040b             | jne                 0x37e

        $sequence_4 = { 8bd9 488d1572ef0000 33c9 ff15???????? 85c0 741f 488b4c2438 }
            // n = 7, score = 100
            //   8bd9                 | dec                 eax
            //   488d1572ef0000       | mov                 dword ptr [esp + 0x28], eax
            //   33c9                 | dec                 esp
            //   ff15????????         |                     
            //   85c0                 | mov                 dword ptr [esp + 0x20], esi
            //   741f                 | mov                 byte ptr [esp + 0x61], 1
            //   488b4c2438           | dec                 esp

        $sequence_5 = { 0f1f00 b8abaaaaaa 448bc1 f7e1 c1ea05 8d0452 c1e004 }
            // n = 7, score = 100
            //   0f1f00               | add                 ecx, ebp
            //   b8abaaaaaa           | mov                 dword ptr [ebx - 4], ecx
            //   448bc1               | dec                 esp
            //   f7e1                 | mov                 edi, dword ptr [esp + 0x50]
            //   c1ea05               | jmp                 0x61c
            //   8d0452               | mov                 ecx, dword ptr [ebx]
            //   c1e004               | dec                 eax

        $sequence_6 = { 41b8ffff0000 8bd3 8bc7 2bc3 413bc0 440f42c0 }
            // n = 6, score = 100
            //   41b8ffff0000         | dec                 eax
            //   8bd3                 | mov                 edi, eax
            //   8bc7                 | dec                 eax
            //   2bc3                 | test                eax, eax
            //   413bc0               | je                  0x4fe
            //   440f42c0             | dec                 eax

        $sequence_7 = { c744242803000000 4c89742420 ff15???????? 488905???????? 4885c0 7531 488b0d???????? }
            // n = 7, score = 100
            //   c744242803000000     | pandn               xmm3, xmm5
            //   4c89742420           | add                 edi, 8
            //   ff15????????         |                     
            //   488905????????       |                     
            //   4885c0               | movdqa              xmm5, xmm0
            //   7531                 | paddd               xmm4, xmm0
            //   488b0d????????       |                     

        $sequence_8 = { 48ffc0 66833c4700 75f6 4c89b42420060000 4885c0 }
            // n = 5, score = 100
            //   48ffc0               | dec                 eax
            //   66833c4700           | lea                 edx, [esp + 0x40]
            //   75f6                 | mov                 dword ptr [esp + 0x20], ebp
            //   4c89b42420060000     | inc                 ebp
            //   4885c0               | lea                 eax, [ecx + 8]

        $sequence_9 = { 4c2bc7 420fb64cf03e 460fbebc39e0680200 41ffc7 458bef 442bea 4d63d5 }
            // n = 7, score = 100
            //   4c2bc7               | mov                 ecx, dword ptr [ebp - 0x28]
            //   420fb64cf03e         | inc                 ebp
            //   460fbebc39e0680200     | lea    eax, [ecx + 4]
            //   41ffc7               | dec                 esp
            //   458bef               | mov                 edi, eax
            //   442bea               | dec                 eax
            //   4d63d5               | mov                 dword ptr [esp + 0x30], eax

    condition:
        7 of them and filesize < 405504
}
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