SYMBOLCOMMON_NAMEaka. SYNONYMS
win.locky (Back to overview)

Locky

Actor(s): TA505

URLhaus    

Locky is a high profile ransomware family that first appeared in early 2016 and was observed being active until end of 2017. It encrypts files on the victim system and asks for ransom in order to have back original files. In its first version it added a .locky extension to the encrypted files, and in recent versions it added the .lukitus extension. The ransom amount is defined in BTC and depends on the actor.

References
2020-06-22CERT-FRCERT-FR
@techreport{certfr:20200622:volution:fba1cfa, author = {CERT-FR}, title = {{Évolution De Lactivité du Groupe Cybercriminel TA505}}, date = {2020-06-22}, institution = {CERT-FR}, url = {https://www.cert.ssi.gouv.fr/uploads/CERTFR-2020-CTI-006.pdf}, language = {French}, urldate = {2020-06-24} } Évolution De Lactivité du Groupe Cybercriminel TA505
Amadey AndroMut Bart Clop Dridex FlawedGrace Gandcrab Get2 GlobeImposter Jaff Locky Marap Philadephia Ransom QuantLoader Scarab Ransomware SDBbot ServHelper Silence tRat TrickBot
2020-05-21Intel 471Intel 471
@online{471:20200521:brief:048d164, author = {Intel 471}, title = {{A brief history of TA505}}, date = {2020-05-21}, organization = {Intel 471}, url = {https://blog.intel471.com/2020/05/21/a-brief-history-of-ta505/}, language = {English}, urldate = {2020-05-23} } A brief history of TA505
AndroMut Bart Dridex FlawedAmmyy FlawedGrace Gandcrab Get2 GlobeImposter Jaff Kegotip Locky Necurs Philadephia Ransom Pony QuantLoader Rockloader SDBbot ServHelper Shifu Snatch TrickBot
2020-02-10viXraJason Reaves
@techreport{reaves:20200210:case:3f668be, author = {Jason Reaves}, title = {{A Case Study into solving Crypters/Packers in Malware Obfuscation using an SMT approach}}, date = {2020-02-10}, institution = {viXra}, url = {https://vixra.org/pdf/2002.0183v1.pdf}, language = {English}, urldate = {2020-02-27} } A Case Study into solving Crypters/Packers in Malware Obfuscation using an SMT approach
Locky
2019-09-09McAfeeThomas Roccia, Marc Rivero López, Chintan Shah
@online{roccia:20190909:evolution:baf3b6c, author = {Thomas Roccia and Marc Rivero López and Chintan Shah}, title = {{Evolution of Malware Sandbox Evasion Tactics – A Retrospective Study}}, date = {2019-09-09}, organization = {McAfee}, url = {https://securingtomorrow.mcafee.com/other-blogs/mcafee-labs/evolution-of-malware-sandbox-evasion-tactics-a-retrospective-study/}, language = {English}, urldate = {2020-01-10} } Evolution of Malware Sandbox Evasion Tactics – A Retrospective Study
Cutwail Dridex Dyre Kovter Locky Phorpiex Simda
2019-07-30Dissecting MalwareMarius Genheimer
@online{genheimer:20190730:picking:cea78ea, author = {Marius Genheimer}, title = {{Picking Locky}}, date = {2019-07-30}, organization = {Dissecting Malware}, url = {https://dissectingmalwa.re/picking-locky.html}, language = {English}, urldate = {2020-03-27} } Picking Locky
Locky
2018-03-20StormshieldMehdi Talbi
@online{talbi:20180320:deobfuscating:7ac7605, author = {Mehdi Talbi}, title = {{De-obfuscating Jump Chains with Binary Ninja}}, date = {2018-03-20}, organization = {Stormshield}, url = {https://thisissecurity.stormshield.com/2018/03/20/de-obfuscating-jump-chains-with-binary-ninja/}, language = {English}, urldate = {2020-03-16} } De-obfuscating Jump Chains with Binary Ninja
Locky
2017-11-07ThreatVectorCylance Threat Research Team
@online{team:20171107:locky:a38e9b5, author = {Cylance Threat Research Team}, title = {{Locky Ransomware}}, date = {2017-11-07}, organization = {ThreatVector}, url = {https://www.cylance.com/en_us/blog/threat-spotlight-locky-ransomware.html}, language = {English}, urldate = {2020-01-07} } Locky Ransomware
Locky
2017-08-16Bleeping ComputerLawrence Abrams
@online{abrams:20170816:locky:7445bd0, author = {Lawrence Abrams}, title = {{Locky Ransomware switches to the Lukitus extension for Encrypted Files}}, date = {2017-08-16}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/locky-ransomware-switches-to-the-lukitus-extension-for-encrypted-files/}, language = {English}, urldate = {2019-12-20} } Locky Ransomware switches to the Lukitus extension for Encrypted Files
Locky
2017-08-10botfrei BlogTom Berchem
@online{berchem:20170810:weltweite:5df6bfa, author = {Tom Berchem}, title = {{Weltweite Spamwelle verbreitet teuflische Variante des Locky}}, date = {2017-08-10}, organization = {botfrei Blog}, url = {https://blog.botfrei.de/2017/08/weltweite-spamwelle-verbreitet-teufliche-variante-des-locky/}, language = {German}, urldate = {2019-12-10} } Weltweite Spamwelle verbreitet teuflische Variante des Locky
Locky
2017-06-22Bleeping ComputerCatalin Cimpanu
@online{cimpanu:20170622:locky:4a088f0, author = {Catalin Cimpanu}, title = {{Locky Ransomware Returns, but Targets Only Windows XP & Vista}}, date = {2017-06-22}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/locky-ransomware-returns-but-targets-only-windows-xp-and-vista/}, language = {English}, urldate = {2019-12-20} } Locky Ransomware Returns, but Targets Only Windows XP & Vista
Locky
2017-06-21CiscoAlex Chiu, Warren Mercer, Jaeson Schultz, Sean Baird, Matthew Molyett
@online{chiu:20170621:player:b44064a, author = {Alex Chiu and Warren Mercer and Jaeson Schultz and Sean Baird and Matthew Molyett}, title = {{Player 1 Limps Back Into the Ring - Hello again, Locky!}}, date = {2017-06-21}, organization = {Cisco}, url = {http://blog.talosintelligence.com/2017/06/necurs-locky-campaign.html}, language = {English}, urldate = {2019-12-17} } Player 1 Limps Back Into the Ring - Hello again, Locky!
Locky
2017-01-31MalwarebytesMalwarebytes Labs
@online{labs:20170131:locky:92db484, author = {Malwarebytes Labs}, title = {{Locky Bart ransomware and backend server analysis}}, date = {2017-01-31}, organization = {Malwarebytes}, url = {https://blog.malwarebytes.com/threat-analysis/2017/01/locky-bart-ransomware-and-backend-server-analysis/}, language = {English}, urldate = {2019-12-20} } Locky Bart ransomware and backend server analysis
Locky
2016-07-07Pierluigi Paganini
@online{paganini:20160707:new:7c765a2, author = {Pierluigi Paganini}, title = {{New threat dubbed Zepto Ransomware is spreading out with a new email spam campaign. It is a variant of the recent Locky Ransomware.}}, date = {2016-07-07}, url = {http://securityaffairs.co/wordpress/49094/malware/zepto-ransomware.html}, language = {English}, urldate = {2019-11-22} } New threat dubbed Zepto Ransomware is spreading out with a new email spam campaign. It is a variant of the recent Locky Ransomware.
Locky
2016-03-01Malwarebyteshasherezade
@online{hasherezade:20160301:look:fe35696, author = {hasherezade}, title = {{Look Into Locky Ransomware}}, date = {2016-03-01}, organization = {Malwarebytes}, url = {https://blog.malwarebytes.com/threat-analysis/2016/03/look-into-locky/}, language = {English}, urldate = {2019-12-20} } Look Into Locky Ransomware
Locky
Yara Rules
[TLP:WHITE] win_locky_auto (20200529 | autogenerated rule brought to you by yara-signator)
rule win_locky_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.locky"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 = { 89461c b880000000 894620 894628 }
            // n = 4, score = 2100
            //   89461c               | mov                 dword ptr [esi + 0x1c], eax
            //   b880000000           | mov                 eax, 0x80
            //   894620               | mov                 dword ptr [esi + 0x20], eax
            //   894628               | mov                 dword ptr [esi + 0x28], eax

        $sequence_1 = { 50 c745f8???????? e8???????? cc 8b8050020000 }
            // n = 5, score = 2100
            //   50                   | push                eax
            //   c745f8????????       |                     
            //   e8????????           |                     
            //   cc                   | int3                
            //   8b8050020000         | mov                 eax, dword ptr [eax + 0x250]

        $sequence_2 = { e8???????? 83c414 6a01 33ff 8db578ffffff e8???????? }
            // n = 6, score = 2100
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   6a01                 | push                1
            //   33ff                 | xor                 edi, edi
            //   8db578ffffff         | lea                 esi, [ebp - 0x88]
            //   e8????????           |                     

        $sequence_3 = { c21000 ff15???????? 8945fc 68???????? 8d45f8 }
            // n = 5, score = 2100
            //   c21000               | ret                 0x10
            //   ff15????????         |                     
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   68????????           |                     
            //   8d45f8               | lea                 eax, [ebp - 8]

        $sequence_4 = { 837dfc00 7405 ff75fc ffd6 53 }
            // n = 5, score = 2100
            //   837dfc00             | cmp                 dword ptr [ebp - 4], 0
            //   7405                 | je                  7
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ffd6                 | call                esi
            //   53                   | push                ebx

        $sequence_5 = { 81ec10020000 8365fc00 8d85f0fdffff 50 6a00 68???????? }
            // n = 6, score = 2100
            //   81ec10020000         | sub                 esp, 0x210
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   8d85f0fdffff         | lea                 eax, [ebp - 0x210]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   68????????           |                     

        $sequence_6 = { 0faf459c 83c01f 83e0e0 99 }
            // n = 4, score = 2100
            //   0faf459c             | imul                eax, dword ptr [ebp - 0x64]
            //   83c01f               | add                 eax, 0x1f
            //   83e0e0               | and                 eax, 0xffffffe0
            //   99                   | cdq                 

        $sequence_7 = { 8d45ec 50 895dec ff15???????? 85c0 }
            // n = 5, score = 2100
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   50                   | push                eax
            //   895dec               | mov                 dword ptr [ebp - 0x14], ebx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_8 = { 03d3 5b c21000 e9???????? 8bff 55 }
            // n = 6, score = 1400
            //   03d3                 | add                 edx, ebx
            //   5b                   | pop                 ebx
            //   c21000               | ret                 0x10
            //   e9????????           |                     
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp

        $sequence_9 = { 8d1b e9???????? 90 50 e9???????? }
            // n = 5, score = 700
            //   8d1b                 | lea                 ebx, [ebx]
            //   e9????????           |                     
            //   90                   | nop                 
            //   50                   | push                eax
            //   e9????????           |                     

        $sequence_10 = { 5e c21000 8bff 55 8bec 33c0 8b4d08 }
            // n = 7, score = 700
            //   5e                   | pop                 esi
            //   c21000               | ret                 0x10
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   33c0                 | xor                 eax, eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_11 = { 8d12 e9???????? 90 8d36 }
            // n = 4, score = 700
            //   8d12                 | lea                 edx, [edx]
            //   e9????????           |                     
            //   90                   | nop                 
            //   8d36                 | lea                 esi, [esi]

        $sequence_12 = { 90 89e5 90 eb04 }
            // n = 4, score = 700
            //   90                   | nop                 
            //   89e5                 | mov                 ebp, esp
            //   90                   | nop                 
            //   eb04                 | jmp                 6

        $sequence_13 = { e9???????? 90 c745f8???????? 90 }
            // n = 4, score = 700
            //   e9????????           |                     
            //   90                   | nop                 
            //   c745f8????????       |                     
            //   90                   | nop                 

        $sequence_14 = { 90 eb05 8d1b 90 }
            // n = 4, score = 700
            //   90                   | nop                 
            //   eb05                 | jmp                 7
            //   8d1b                 | lea                 ebx, [ebx]
            //   90                   | nop                 

        $sequence_15 = { 90 e9???????? 5f 90 e9???????? }
            // n = 5, score = 700
            //   90                   | nop                 
            //   e9????????           |                     
            //   5f                   | pop                 edi
            //   90                   | nop                 
            //   e9????????           |                     

        $sequence_16 = { 90 e9???????? 90 8b550c }
            // n = 4, score = 700
            //   90                   | nop                 
            //   e9????????           |                     
            //   90                   | nop                 
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]

    condition:
        7 of them and filesize < 1122304
}
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