win.vawtrak (Back to overview)

Vawtrak

aka: Catch, grabnew, NeverQuest

Actor(s): Lunar Spider

URLhaus    

There is no description at this point.

References
https://www.blueliv.com/downloads/network-insights-into-vawtrak-v2.pdf
https://info.phishlabs.com/blog/the-unrelenting-evolution-of-vawtrak
https://threatpost.com/pos-attacks-net-crooks-20-million-stolen-bank-cards/117595/
http://thehackernews.com/2017/01/neverquest-fbi-hacker.html
https://blog.fox-it.com/2018/08/09/bokbot-the-rebirth-of-a-banker/
https://www.crowdstrike.com/blog/sin-ful-spiders-wizard-spider-and-lunar-spider-sharing-the-same-web/
Yara Rules
[TLP:WHITE] win_vawtrak_auto (20190620 | autogenerated rule brought to you by yara-signator)
rule win_vawtrak_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2019-07-05"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator 0.2a"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.vawtrak"
        malpedia_version = "20190620"
        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 / approach 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 = { eb?? e8???????? 83f806 73?? }
            // n = 4, score = 2800
            //   eb??                 |                     
            //   e8????????           |                     
            //   83f806               | cmp                 eax, 6
            //   73??                 |                     

        $sequence_1 = { eb?? e8???????? 83f806 73?? }
            // n = 4, score = 2800
            //   eb??                 |                     
            //   e8????????           |                     
            //   83f806               | cmp                 eax, 6
            //   73??                 |                     

        $sequence_2 = { 50 6a00 6a00 e8???????? 50 ff15???????? }
            // n = 6, score = 2600
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   e8????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_3 = { 6a01 ff35???????? 6a04 6a01 50 }
            // n = 5, score = 2600
            //   6a01                 | push                1
            //   ff35????????         |                     
            //   6a04                 | push                4
            //   6a01                 | push                1
            //   50                   | push                eax

        $sequence_4 = { 74?? 6a01 ff35???????? 6a04 6a01 50 ff15???????? }
            // n = 7, score = 2600
            //   74??                 |                     
            //   6a01                 | push                1
            //   ff35????????         |                     
            //   6a04                 | push                4
            //   6a01                 | push                1
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_5 = { 8bc6 8703 3bc6 74?? }
            // n = 4, score = 2600
            //   8bc6                 | mov                 eax, esi
            //   8703                 | xchg                dword ptr [ebx], eax
            //   3bc6                 | cmp                 eax, esi
            //   74??                 |                     

        $sequence_6 = { 8bc6 8703 3bc6 74?? }
            // n = 4, score = 2600
            //   8bc6                 | mov                 eax, esi
            //   8703                 | xchg                dword ptr [ebx], eax
            //   3bc6                 | cmp                 eax, esi
            //   74??                 |                     

        $sequence_7 = { ff35???????? 6a04 6a01 50 ff15???????? }
            // n = 5, score = 2600
            //   ff35????????         |                     
            //   6a04                 | push                4
            //   6a01                 | push                1
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_8 = { 6a04 6a01 50 ff15???????? 85c0 }
            // n = 5, score = 2600
            //   6a04                 | push                4
            //   6a01                 | push                1
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_9 = { ff35???????? 6a04 6a01 50 ff15???????? 85c0 }
            // n = 6, score = 2600
            //   ff35????????         |                     
            //   6a04                 | push                4
            //   6a01                 | push                1
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_10 = { 81f903010000 74?? ba00ff0000 8bc1 23c2 3bc2 74?? }
            // n = 7, score = 2400
            //   81f903010000         | cmp                 ecx, 0x103
            //   74??                 |                     
            //   ba00ff0000           | mov                 edx, 0xff00
            //   8bc1                 | mov                 eax, ecx
            //   23c2                 | and                 eax, edx
            //   3bc2                 | cmp                 eax, edx
            //   74??                 |                     

        $sequence_11 = { 81f903010000 74?? ba00ff0000 8bc1 23c2 3bc2 }
            // n = 6, score = 2400
            //   81f903010000         | cmp                 ecx, 0x103
            //   74??                 |                     
            //   ba00ff0000           | mov                 edx, 0xff00
            //   8bc1                 | mov                 eax, ecx
            //   23c2                 | and                 eax, edx
            //   3bc2                 | cmp                 eax, edx

        $sequence_12 = { 8bc1 23c2 3bc2 74?? }
            // n = 4, score = 2400
            //   8bc1                 | mov                 eax, ecx
            //   23c2                 | and                 eax, edx
            //   3bc2                 | cmp                 eax, edx
            //   74??                 |                     

        $sequence_13 = { 74?? ba00ff0000 8bc1 23c2 3bc2 74?? }
            // n = 6, score = 2400
            //   74??                 |                     
            //   ba00ff0000           | mov                 edx, 0xff00
            //   8bc1                 | mov                 eax, ecx
            //   23c2                 | and                 eax, edx
            //   3bc2                 | cmp                 eax, edx
            //   74??                 |                     

        $sequence_14 = { 74?? ba00ff0000 8bc1 23c2 3bc2 }
            // n = 5, score = 2400
            //   74??                 |                     
            //   ba00ff0000           | mov                 edx, 0xff00
            //   8bc1                 | mov                 eax, ecx
            //   23c2                 | and                 eax, edx
            //   3bc2                 | cmp                 eax, edx

        $sequence_15 = { ba00ff0000 8bc1 23c2 3bc2 }
            // n = 4, score = 2400
            //   ba00ff0000           | mov                 edx, 0xff00
            //   8bc1                 | mov                 eax, ecx
            //   23c2                 | and                 eax, edx
            //   3bc2                 | cmp                 eax, edx

        $sequence_16 = { c1e910 e9???????? 8ac1 c1e904 c0e004 }
            // n = 5, score = 1200
            //   c1e910               | shr                 ecx, 0x10
            //   e9????????           |                     
            //   8ac1                 | mov                 al, cl
            //   c1e904               | shr                 ecx, 4
            //   c0e004               | shl                 al, 4

        $sequence_17 = { c1e910 e9???????? 8ac1 c1e904 }
            // n = 4, score = 1200
            //   c1e910               | shr                 ecx, 0x10
            //   e9????????           |                     
            //   8ac1                 | mov                 al, cl
            //   c1e904               | shr                 ecx, 4

        $sequence_18 = { e9???????? 8ac1 c1e904 c0e004 }
            // n = 4, score = 1200
            //   e9????????           |                     
            //   8ac1                 | mov                 al, cl
            //   c1e904               | shr                 ecx, 4
            //   c0e004               | shl                 al, 4

        $sequence_19 = { c1e908 eb?? 8ac1 c0e004 }
            // n = 4, score = 1200
            //   c1e908               | shr                 ecx, 8
            //   eb??                 |                     
            //   8ac1                 | mov                 al, cl
            //   c0e004               | shl                 al, 4

        $sequence_20 = { 3d80000000 74?? 83f8ff 75?? }
            // n = 4, score = 1100
            //   3d80000000           | cmp                 eax, 0x80
            //   74??                 |                     
            //   83f8ff               | cmp                 eax, -1
            //   75??                 |                     

        $sequence_21 = { e8???????? eb?? 3c0f 75?? }
            // n = 4, score = 1100
            //   e8????????           |                     
            //   eb??                 |                     
            //   3c0f                 | cmp                 al, 0xf
            //   75??                 |                     

    condition:
        7 of them
}
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