SYMBOLCOMMON_NAMEaka. SYNONYMS
win.graftor (Back to overview)

Graftor

aka: MewsSpy
URLhaus    

There is no description at this point.

References
2017-09-05Cisco TalosHolger Unterbrink, Matthew Molyett
@online{unterbrink:20170905:graftor:ed3b2a3, author = {Holger Unterbrink and Matthew Molyett}, title = {{Graftor - But I Never Asked for This…}}, date = {2017-09-05}, organization = {Cisco Talos}, url = {http://blog.talosintelligence.com/2017/09/graftor-but-i-never-asked-for-this.html}, language = {English}, urldate = {2020-01-10} } Graftor - But I Never Asked for This…
Graftor
2017-09-05Talos IntelligenceMatthew Molyett, Holger Unterbrink
@online{molyett:20170905:graftor:d4dda71, author = {Matthew Molyett and Holger Unterbrink}, title = {{Graftor - But I Never Asked for This…}}, date = {2017-09-05}, organization = {Talos Intelligence}, url = {https://malware.news/t/graftor-but-i-never-asked-for-this/14857}, language = {English}, urldate = {2023-09-28} } Graftor - But I Never Asked for This…
Graftor
2015-01-21Johannes Bader's BlogJohannes Bader
@online{bader:20150121:dga:c2a0550, author = {Johannes Bader}, title = {{The DGA of Symmi}}, date = {2015-01-21}, organization = {Johannes Bader's Blog}, url = {https://bin.re/blog/the-dga-of-symmi/}, language = {English}, urldate = {2023-08-10} } The DGA of Symmi
Graftor
Yara Rules
[TLP:WHITE] win_graftor_auto (20230715 | Detects win.graftor.)
rule win_graftor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.graftor."
        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.graftor"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 56 ff15???????? eb54 a1???????? }
            // n = 4, score = 100
            //   56                   | push                esi
            //   ff15????????         |                     
            //   eb54                 | jmp                 0x56
            //   a1????????           |                     

        $sequence_1 = { 59 8b852cffffff 6bdb54 6bff54 03d8 }
            // n = 5, score = 100
            //   59                   | pop                 ecx
            //   8b852cffffff         | mov                 eax, dword ptr [ebp - 0xd4]
            //   6bdb54               | imul                ebx, ebx, 0x54
            //   6bff54               | imul                edi, edi, 0x54
            //   03d8                 | add                 ebx, eax

        $sequence_2 = { 83c40c 57 c745fc05000000 e8???????? 834dfcff 53 6a01 }
            // n = 7, score = 100
            //   83c40c               | add                 esp, 0xc
            //   57                   | push                edi
            //   c745fc05000000       | mov                 dword ptr [ebp - 4], 5
            //   e8????????           |                     
            //   834dfcff             | or                  dword ptr [ebp - 4], 0xffffffff
            //   53                   | push                ebx
            //   6a01                 | push                1

        $sequence_3 = { 53 53 e8???????? cc 6a20 b899a44c00 }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   e8????????           |                     
            //   cc                   | int3                
            //   6a20                 | push                0x20
            //   b899a44c00           | mov                 eax, 0x4ca499

        $sequence_4 = { 53 57 c645fc02 e8???????? 8d45d4 50 8d4508 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   57                   | push                edi
            //   c645fc02             | mov                 byte ptr [ebp - 4], 2
            //   e8????????           |                     
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   50                   | push                eax
            //   8d4508               | lea                 eax, [ebp + 8]

        $sequence_5 = { 50 8d8c2438020000 c684245c03000086 e8???????? 53 56 8d4c2434 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8d8c2438020000       | lea                 ecx, [esp + 0x238]
            //   c684245c03000086     | mov                 byte ptr [esp + 0x35c], 0x86
            //   e8????????           |                     
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8d4c2434             | lea                 ecx, [esp + 0x34]

        $sequence_6 = { 8d8424f8000000 c68424540300007d 8b4c2420 50 e8???????? 53 6a01 }
            // n = 7, score = 100
            //   8d8424f8000000       | lea                 eax, [esp + 0xf8]
            //   c68424540300007d     | mov                 byte ptr [esp + 0x354], 0x7d
            //   8b4c2420             | mov                 ecx, dword ptr [esp + 0x20]
            //   50                   | push                eax
            //   e8????????           |                     
            //   53                   | push                ebx
            //   6a01                 | push                1

        $sequence_7 = { ff15???????? 85db 5b 740e 8d85fcdfffff 50 e8???????? }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   85db                 | test                ebx, ebx
            //   5b                   | pop                 ebx
            //   740e                 | je                  0x10
            //   8d85fcdfffff         | lea                 eax, [ebp - 0x2004]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_8 = { 68d8db4c00 8db524ffffff e8???????? 8d8578ffffff 50 8d85b8feffff 68c8aa4d00 }
            // n = 7, score = 100
            //   68d8db4c00           | push                0x4cdbd8
            //   8db524ffffff         | lea                 esi, [ebp - 0xdc]
            //   e8????????           |                     
            //   8d8578ffffff         | lea                 eax, [ebp - 0x88]
            //   50                   | push                eax
            //   8d85b8feffff         | lea                 eax, [ebp - 0x148]
            //   68c8aa4d00           | push                0x4daac8

        $sequence_9 = { c68424580300008c e8???????? 59 59 57 53 8d8c246c010000 }
            // n = 7, score = 100
            //   c68424580300008c     | mov                 byte ptr [esp + 0x358], 0x8c
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   57                   | push                edi
            //   53                   | push                ebx
            //   8d8c246c010000       | lea                 ecx, [esp + 0x16c]

    condition:
        7 of them and filesize < 294912
}
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