SYMBOLCOMMON_NAMEaka. SYNONYMS
win.korlia (Back to overview)

Korlia

aka: Bisonal

Actor(s): Tonto Team


There is no description at this point.

References
2022-07-07Sentinel LABSTom Hegel
@online{hegel:20220707:targets:174ab91, author = {Tom Hegel}, title = {{Targets of Interest - Russian Organizations Increasingly Under Attack By Chinese APTs}}, date = {2022-07-07}, organization = {Sentinel LABS}, url = {https://www.sentinelone.com/labs/targets-of-interest-russian-organizations-increasingly-under-attack-by-chinese-apts/}, language = {English}, urldate = {2022-07-12} } Targets of Interest - Russian Organizations Increasingly Under Attack By Chinese APTs
8.t Dropper Korlia
2021-07-08YouTube (PT Product Update)Denis Kuvshinov
@online{kuvshinov:20210708:how:ea6d201, author = {Denis Kuvshinov}, title = {{How winnti APT grouping works}}, date = {2021-07-08}, organization = {YouTube (PT Product Update)}, url = {https://www.youtube.com/watch?v=_fstHQSK-kk}, language = {Russian}, urldate = {2021-09-20} } How winnti APT grouping works
Korlia ShadowPad Winnti
2021-07-08PTSecurityDenis Kuvshinov
@techreport{kuvshinov:20210708:how:2e5a659, author = {Denis Kuvshinov}, title = {{How winnti APT grouping works}}, date = {2021-07-08}, institution = {PTSecurity}, url = {https://www.ptsecurity.com/upload/corporate/ru-ru/webinars/ics/winnti-shadowpad.pdf}, language = {Russian}, urldate = {2021-09-20} } How winnti APT grouping works
Korlia ShadowPad Winnti
2020-09-08PTSecurityPTSecurity
@techreport{ptsecurity:20200908:shadowpad:2903f45, author = {PTSecurity}, title = {{ShadowPad: new activity from the Winnti group}}, date = {2020-09-08}, institution = {PTSecurity}, url = {https://www.ptsecurity.com/upload/corporate/ww-en/pt-esc/winnti-2020-eng.pdf}, language = {English}, urldate = {2020-10-08} } ShadowPad: new activity from the Winnti group
CCleaner Backdoor Korlia ShadowPad TypeHash
2020-08-13Kaspersky LabsKonstantin Zykov
@online{zykov:20200813:cactuspete:6753952, author = {Konstantin Zykov}, title = {{CactusPete APT group’s updated Bisonal backdoor}}, date = {2020-08-13}, organization = {Kaspersky Labs}, url = {https://securelist.com/cactuspete-apt-groups-updated-bisonal-backdoor/97962/}, language = {English}, urldate = {2020-08-14} } CactusPete APT group’s updated Bisonal backdoor
Korlia Tonto Team
2020-03-12Check PointCheck Point Research
@online{research:20200312:vicious:3218bb8, author = {Check Point Research}, title = {{Vicious Panda: The COVID Campaign}}, date = {2020-03-12}, organization = {Check Point}, url = {https://research.checkpoint.com/2020/vicious-panda-the-covid-campaign/}, language = {English}, urldate = {2020-03-13} } Vicious Panda: The COVID Campaign
8.t Dropper BYEBY Enfal Korlia Poison Ivy
2020-03-05AhnLabAhnLab ASEC Analysis Team
@online{team:20200305:bisonal:96d4292, author = {AhnLab ASEC Analysis Team}, title = {{신천지 비상연락처 위장한 Bisonal 악성코드 유포 중}}, date = {2020-03-05}, organization = {AhnLab}, url = {https://asec.ahnlab.com/1298}, language = {Korean}, urldate = {2020-03-09} } 신천지 비상연락처 위장한 Bisonal 악성코드 유포 중
Korlia
2020-03-05Cisco TalosWarren Mercer, Paul Rascagnères, Vitor Ventura
@online{mercer:20200305:bisonal:7885944, author = {Warren Mercer and Paul Rascagnères and Vitor Ventura}, title = {{Bisonal: 10 years of play}}, date = {2020-03-05}, organization = {Cisco Talos}, url = {https://blog.talosintelligence.com/2020/03/bisonal-10-years-of-play.html}, language = {English}, urldate = {2020-03-05} } Bisonal: 10 years of play
Korlia
2020-01-29nao_sec blognao_sec
@online{naosec:20200129:overhead:ec0aeb5, author = {nao_sec}, title = {{An Overhead View of the Royal Road}}, date = {2020-01-29}, organization = {nao_sec blog}, url = {https://nao-sec.org/2020/01/an-overhead-view-of-the-royal-road.html}, language = {English}, urldate = {2020-02-03} } An Overhead View of the Royal Road
BLACKCOFFEE Cotx RAT Datper DDKONG Derusbi Icefog Korlia NewCore RAT PLAINTEE Poison Ivy Sisfader
2020-01-17NTT SecurityTakai Hajime
@techreport{hajime:20200117:operation:ef488fd, author = {Takai Hajime}, title = {{Operation Bitter Biscuit}}, date = {2020-01-17}, institution = {NTT Security}, url = {https://jsac.jpcert.or.jp/archive/2020/pdf/JSAC2020_3_takai_jp.pdf}, language = {Japanese}, urldate = {2020-07-20} } Operation Bitter Biscuit
Korlia
2020SecureworksSecureWorks
@online{secureworks:2020:bronze:3d292d3, author = {SecureWorks}, title = {{BRONZE HUNTLEY}}, date = {2020}, organization = {Secureworks}, url = {https://www.secureworks.com/research/threat-profiles/bronze-huntley}, language = {English}, urldate = {2020-05-23} } BRONZE HUNTLEY
Korlia
2019-03-22AhnLabAhnLab ASEC Analysis Team
@techreport{team:20190322:asec:3a00378, author = {AhnLab ASEC Analysis Team}, title = {{ASEC REPORT VOL.93 Q4 2018}}, date = {2019-03-22}, institution = {AhnLab}, url = {https://global.ahnlab.com/global/upload/download/asecreport/ASEC%20REPORT_vol.93_ENG.pdf}, language = {English}, urldate = {2020-07-24} } ASEC REPORT VOL.93 Q4 2018
Korlia
2018-07-31Palo Alto Networks Unit 42Kaoru Hayashi, Vicky Ray
@online{hayashi:20180731:bisonal:8ca9ce6, author = {Kaoru Hayashi and Vicky Ray}, title = {{Bisonal Malware Used in Attacks Against Russia and South Korea}}, date = {2018-07-31}, organization = {Palo Alto Networks Unit 42}, url = {https://unit42.paloaltonetworks.com/unit42-bisonal-malware-used-attacks-russia-south-korea/}, language = {English}, urldate = {2020-07-20} } Bisonal Malware Used in Attacks Against Russia and South Korea
Korlia
2018-05-15BSides DetroitKeven Murphy, Stefano Maccaglia
@online{murphy:20180515:ir:ac5b561, author = {Keven Murphy and Stefano Maccaglia}, title = {{IR in Heterogeneous Environment}}, date = {2018-05-15}, organization = {BSides Detroit}, url = {https://www.slideshare.net/StefanoMaccaglia/bsides-ir-in-heterogeneous-environment}, language = {English}, urldate = {2020-07-20} } IR in Heterogeneous Environment
Korlia Poison Ivy
2014-11-25Adventures in SecurityNick Hoffman
@online{hoffman:20141125:curious:57f7b6a, author = {Nick Hoffman}, title = {{Curious Korlia}}, date = {2014-11-25}, organization = {Adventures in Security}, url = {https://github.com/malware-kitten/securitykitten.github.io/blob/master/_posts/2014-11-25-curious-korlia.md}, language = {English}, urldate = {2022-09-19} } Curious Korlia
Korlia
2013FireEyeAlex Lanstein
@techreport{lanstein:2013:apts:2b30193, author = {Alex Lanstein}, title = {{APTs By The Dozen: Dissecting Advanced Attacks}}, date = {2013}, institution = {FireEye}, url = {https://web.archive.org/web/20130920120931/https:/www.rsaconference.com/writable/presentations/file_upload/cle-t04_final_v1.pdf}, language = {English}, urldate = {2020-08-14} } APTs By The Dozen: Dissecting Advanced Attacks
Korlia
Yara Rules
[TLP:WHITE] win_korlia_auto (20221125 | Detects win.korlia.)
rule win_korlia_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.korlia."
        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.korlia"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 6a32 50 ff15???????? 85c0 }
            // n = 4, score = 2700
            //   6a32                 | push                0x32
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_1 = { 6a00 ffd6 ff15???????? 8bf8 b83bd4b531 f7ef c1fa18 }
            // n = 7, score = 2600
            //   6a00                 | push                0
            //   ffd6                 | call                esi
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax
            //   b83bd4b531           | mov                 eax, 0x31b5d43b
            //   f7ef                 | imul                edi
            //   c1fa18               | sar                 edx, 0x18

        $sequence_2 = { c645e401 c745fc00000000 52 51 53 }
            // n = 5, score = 2600
            //   c645e401             | mov                 byte ptr [ebp - 0x1c], 1
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   52                   | push                edx
            //   51                   | push                ecx
            //   53                   | push                ebx

        $sequence_3 = { 8bc7 b9005c2605 99 f7f9 b859be904a }
            // n = 5, score = 2600
            //   8bc7                 | mov                 eax, edi
            //   b9005c2605           | mov                 ecx, 0x5265c00
            //   99                   | cdq                 
            //   f7f9                 | idiv                ecx
            //   b859be904a           | mov                 eax, 0x4a90be59

        $sequence_4 = { 6aff 53 6a00 6a00 ffd6 ff15???????? }
            // n = 6, score = 2600
            //   6aff                 | push                -1
            //   53                   | push                ebx
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ffd6                 | call                esi
            //   ff15????????         |                     

        $sequence_5 = { 59 5a c745fcffffffff 8a45e4 8b4df0 64890d00000000 5f }
            // n = 7, score = 2600
            //   59                   | pop                 ecx
            //   5a                   | pop                 edx
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff
            //   8a45e4               | mov                 al, byte ptr [ebp - 0x1c]
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   5f                   | pop                 edi

        $sequence_6 = { 83c9ff 33c0 f2ae f7d1 49 83f90f 7604 }
            // n = 7, score = 2600
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   49                   | dec                 ecx
            //   83f90f               | cmp                 ecx, 0xf
            //   7604                 | jbe                 6

        $sequence_7 = { 81fb68584d56 0f9445e4 5b 59 5a c745fcffffffff }
            // n = 6, score = 2600
            //   81fb68584d56         | cmp                 ebx, 0x564d5868
            //   0f9445e4             | sete                byte ptr [ebp - 0x1c]
            //   5b                   | pop                 ebx
            //   59                   | pop                 ecx
            //   5a                   | pop                 edx
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff

        $sequence_8 = { 6a01 53 53 53 51 ff15???????? }
            // n = 6, score = 2300
            //   6a01                 | push                1
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   51                   | push                ecx
            //   ff15????????         |                     

        $sequence_9 = { e8???????? 83c410 85c0 7f14 }
            // n = 4, score = 1700
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   7f14                 | jg                  0x16

        $sequence_10 = { 8b65e8 ff7588 ff15???????? 833d????????ff 750c }
            // n = 5, score = 700
            //   8b65e8               | mov                 esp, dword ptr [ebp - 0x18]
            //   ff7588               | push                dword ptr [ebp - 0x78]
            //   ff15????????         |                     
            //   833d????????ff       |                     
            //   750c                 | jne                 0xe

        $sequence_11 = { ff742410 e8???????? c21000 e8???????? 8a4c2404 6a01 }
            // n = 6, score = 700
            //   ff742410             | push                dword ptr [esp + 0x10]
            //   e8????????           |                     
            //   c21000               | ret                 0x10
            //   e8????????           |                     
            //   8a4c2404             | mov                 cl, byte ptr [esp + 4]
            //   6a01                 | push                1

        $sequence_12 = { e8???????? 8a4c2404 6a01 884814 8b4c240c 898840200000 }
            // n = 6, score = 700
            //   e8????????           |                     
            //   8a4c2404             | mov                 cl, byte ptr [esp + 4]
            //   6a01                 | push                1
            //   884814               | mov                 byte ptr [eax + 0x14], cl
            //   8b4c240c             | mov                 ecx, dword ptr [esp + 0xc]
            //   898840200000         | mov                 dword ptr [eax + 0x2040], ecx

        $sequence_13 = { 884814 8b4c240c 898840200000 58 c20800 e9???????? }
            // n = 6, score = 700
            //   884814               | mov                 byte ptr [eax + 0x14], cl
            //   8b4c240c             | mov                 ecx, dword ptr [esp + 0xc]
            //   898840200000         | mov                 dword ptr [eax + 0x2040], ecx
            //   58                   | pop                 eax
            //   c20800               | ret                 8
            //   e9????????           |                     

        $sequence_14 = { f2ae f7d1 2bf9 6810270000 }
            // n = 4, score = 700
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   2bf9                 | sub                 edi, ecx
            //   6810270000           | push                0x2710

        $sequence_15 = { 6a00 680030c800 6a00 6a00 68???????? }
            // n = 5, score = 500
            //   6a00                 | push                0
            //   680030c800           | push                0xc83000
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   68????????           |                     

        $sequence_16 = { 8bf9 81e7ff000000 03f2 03f7 }
            // n = 4, score = 500
            //   8bf9                 | mov                 edi, ecx
            //   81e7ff000000         | and                 edi, 0xff
            //   03f2                 | add                 esi, edx
            //   03f7                 | add                 esi, edi

        $sequence_17 = { b8447c0000 e8???????? 53 56 57 }
            // n = 5, score = 500
            //   b8447c0000           | mov                 eax, 0x7c44
            //   e8????????           |                     
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_18 = { 8d442444 894d00 8b542438 83c504 50 895500 83c504 }
            // n = 7, score = 500
            //   8d442444             | lea                 eax, [esp + 0x44]
            //   894d00               | mov                 dword ptr [ebp], ecx
            //   8b542438             | mov                 edx, dword ptr [esp + 0x38]
            //   83c504               | add                 ebp, 4
            //   50                   | push                eax
            //   895500               | mov                 dword ptr [ebp], edx
            //   83c504               | add                 ebp, 4

        $sequence_19 = { ffd6 8d44240c 6804010000 50 }
            // n = 4, score = 400
            //   ffd6                 | call                esi
            //   8d44240c             | lea                 eax, [esp + 0xc]
            //   6804010000           | push                0x104
            //   50                   | push                eax

        $sequence_20 = { 750c ff15???????? 53 e9???????? }
            // n = 4, score = 400
            //   750c                 | jne                 0xe
            //   ff15????????         |                     
            //   53                   | push                ebx
            //   e9????????           |                     

        $sequence_21 = { 51 ff15???????? a1???????? b981000000 }
            // n = 4, score = 400
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   a1????????           |                     
            //   b981000000           | mov                 ecx, 0x81

        $sequence_22 = { 6a00 6880000000 6800000400 8bce }
            // n = 4, score = 400
            //   6a00                 | push                0
            //   6880000000           | push                0x80
            //   6800000400           | push                0x40000
            //   8bce                 | mov                 ecx, esi

        $sequence_23 = { 3bc3 57 740b 8b35???????? 50 ffd6 }
            // n = 6, score = 300
            //   3bc3                 | cmp                 eax, ebx
            //   57                   | push                edi
            //   740b                 | je                  0xd
            //   8b35????????         |                     
            //   50                   | push                eax
            //   ffd6                 | call                esi

        $sequence_24 = { a1???????? 3bc3 7403 50 ffd6 b912010000 }
            // n = 6, score = 300
            //   a1????????           |                     
            //   3bc3                 | cmp                 eax, ebx
            //   7403                 | je                  5
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   b912010000           | mov                 ecx, 0x112

        $sequence_25 = { 33c0 8dbc245e020000 66899c245c020000 f3ab }
            // n = 4, score = 300
            //   33c0                 | xor                 eax, eax
            //   8dbc245e020000       | lea                 edi, [esp + 0x25e]
            //   66899c245c020000     | mov                 word ptr [esp + 0x25c], bx
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_26 = { ff15???????? 50 ff15???????? 68d0070000 ff15???????? }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   68d0070000           | push                0x7d0
            //   ff15????????         |                     

        $sequence_27 = { ff15???????? 85c0 740a 56 50 ff15???????? }
            // n = 6, score = 300
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   740a                 | je                  0xc
            //   56                   | push                esi
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_28 = { 68???????? 68???????? c785e4edffff0c000000 c785e8edffff00000000 }
            // n = 4, score = 100
            //   68????????           |                     
            //   68????????           |                     
            //   c785e4edffff0c000000     | mov    dword ptr [ebp - 0x121c], 0xc
            //   c785e8edffff00000000     | mov    dword ptr [ebp - 0x1218], 0

        $sequence_29 = { 8b54241c 83c404 52 ff15???????? 5f 5e 5d }
            // n = 7, score = 100
            //   8b54241c             | mov                 edx, dword ptr [esp + 0x1c]
            //   83c404               | add                 esp, 4
            //   52                   | push                edx
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp

        $sequence_30 = { 880a 3d80000000 7ce0 33f6 }
            // n = 4, score = 100
            //   880a                 | mov                 byte ptr [edx], cl
            //   3d80000000           | cmp                 eax, 0x80
            //   7ce0                 | jl                  0xffffffe2
            //   33f6                 | xor                 esi, esi

        $sequence_31 = { 8bec b84c7c0000 e8???????? a1???????? 33c5 8945fc }
            // n = 6, score = 100
            //   8bec                 | mov                 ebp, esp
            //   b84c7c0000           | mov                 eax, 0x7c4c
            //   e8????????           |                     
            //   a1????????           |                     
            //   33c5                 | xor                 eax, ebp
            //   8945fc               | mov                 dword ptr [ebp - 4], eax

        $sequence_32 = { 53 55 8bac2440540000 56 57 }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   8bac2440540000       | mov                 ebp, dword ptr [esp + 0x5440]
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_33 = { 51 50 e8???????? 56 83ec0c e8???????? 8b4dfc }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   50                   | push                eax
            //   e8????????           |                     
            //   56                   | push                esi
            //   83ec0c               | sub                 esp, 0xc
            //   e8????????           |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_34 = { ffd6 68???????? ff7724 894710 ffd6 68???????? ff7724 }
            // n = 7, score = 100
            //   ffd6                 | call                esi
            //   68????????           |                     
            //   ff7724               | push                dword ptr [edi + 0x24]
            //   894710               | mov                 dword ptr [edi + 0x10], eax
            //   ffd6                 | call                esi
            //   68????????           |                     
            //   ff7724               | push                dword ptr [edi + 0x24]

        $sequence_35 = { 53 55 57 8b5801 8d6801 83c504 c744240c01000000 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   57                   | push                edi
            //   8b5801               | mov                 ebx, dword ptr [eax + 1]
            //   8d6801               | lea                 ebp, [eax + 1]
            //   83c504               | add                 ebp, 4
            //   c744240c01000000     | mov                 dword ptr [esp + 0xc], 1

        $sequence_36 = { 68???????? ff75fc ffd6 85c0 0f85d2000000 8d45f8 50 }
            // n = 7, score = 100
            //   68????????           |                     
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   0f85d2000000         | jne                 0xd8
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 263168
}
[TLP:WHITE] win_korlia_w0   (20180125 | No description)
rule win_korlia_w0 { 
    meta:
        author = "Nick Hoffman" 
        company = "CBTS - ACS"
        information = "korlia malware found in apt dump" 
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.korlia"
        malpedia_version = "20180125"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

        //case a
        //b2 1f mov dl, 0x1f ; mov key (wildcard) 
        // ----------------- 
        //8A 86 98 40 00 71 mov al, byte ptr url[esi]
        //BF 98 40 00 71 mov edi, offset url 
        //32 C2 xor al, dl 
        //83 C9 FF or ecx, 0FFFFFFFFh 
        //88 86 98 40 00 71 mov byte ptr url[esi], al 
        //33 C0 xor eax, eax 
        //46 inc esi 
        //F2 AE repne scasb 
        //F7 D1 not ecx 
        //49 dec ecx 
        //3B F1 cmp esi, ecx 
        //72 DE jb short loc_71001DE0

        //case b (variant of loop a) 
        //8A 8A 28 50 40 00 mov cl, byte_405028[edx] 
        //BF 28 50 40 00 mov edi, offset byte_405028 
        //32 CB xor cl, bl 
        //33 C0 xor eax, eax 
        //88 8A 28 50 40 00 mov byte_405028[edx], cl
        //83 C9 FF or ecx, 0FFFFFFFFh 
        //42 inc edx 
        //F2 AE repne scasb 
        //F7 D1 not ecx 
        //49 dec ecx 
        //3B D1 cmp edx, ecx 
        //72 DE jb short loc_4047F2 

        //case c (not a variant of the above loop) 
        //8A 0C 28 mov cl, [eax+ebp] 
        //80 F1 28 xor cl, 28h 
        //88 0C 28 mov [eax+ebp], cl 
        //8B 4C 24 14 mov ecx, [esp+0D78h+var_D64]
        //40 inc eax 
        //3B C1 cmp eax, ecx 
        //7C EE jl short loc_404F1C 

    strings:
        $a = {b2 ?? 8A 86 98 40 00 71 BF 98 40 00 71 32 c2 83 C9 FF 88 86 98 40 00 71 33 C0 46 F2 AE F7 D1 49 3B F1} 
        $b = {B3 ?? ?? ?? 8A 8A 28 50 40 00 BF 28 50 40 00 32 CB 33 C0 88 8A 28 50 40 00 83 C9 FF 42 F2 AE F7 D1 49 3B D1} 
        $c = {8A 0C 28 80 F1 ?? 88 0C 28 8B 4C 24 14 40 3B C1} 
        $d = {00 62 69 73 6F 6E 61 6C 00} //config marker "\x00bisonal\x00"
    condition:
        any of them 
}
[TLP:WHITE] win_korlia_w1   (20210204 | rule to detect korlia/bisonal)
rule win_korlia_w1 { 
    meta: 
        author = "pinksawtooth"
        source = "https://github.com/nao-sec/yara_rules/blob/master/Malware/bisonal.yar"
        reference = "https://www.paloaltonetworks.jp/company/in-the-news/2018/unit42-bisonal-malware-used-attacks-russia-south-korea"
        description = "rule to detect korlia/bisonal"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.korlia"
        malpedia_rule_date = "20210204"
        malpedia_hash = ""
        malpedia_version = "20210204"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings: 
        $s1 = "akspbu.txt" ascii wide 
        $s2 = "ks8d" ascii wide 
        $s3 = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.1.4322" ascii wide 
        /* bisonal_decode_jsac */ 
        $decode = { bb bf 58 00 00 [0-2] 8d 0c 40 c1 e1 04 2b c8 8d 0c 49 8d 0c 89 8d 0c c9 8d 04 48 83 c9 ff } 
    condition: 
            uint16(0) == 0x5A4D 
        and
            (all of ($s*) or $decode) 
}
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