SYMBOLCOMMON_NAMEaka. SYNONYMS
win.cryptolocker (Back to overview)

CryptoLocker


CryptoLocker is a new sophisticated malware that was launched in the late 2013. It is designed to attack Windows operating system by encrypting all the files from the system using a RSA-2048 public key. To decrypt the mentioned files, the user has to pay a ransom (usually 300 USD/EUR) or 2 BitCoins.

References
2021-09-14CrowdStrikeCrowdStrike Intelligence Team
@online{team:20210914:big:b345561, author = {CrowdStrike Intelligence Team}, title = {{Big Game Hunting TTPs Continue to Shift After DarkSide Pipeline Attack}}, date = {2021-09-14}, organization = {CrowdStrike}, url = {https://www.crowdstrike.com/blog/how-big-game-hunting-ttps-shifted-after-darkside-pipeline-attack/}, language = {English}, urldate = {2021-09-19} } Big Game Hunting TTPs Continue to Shift After DarkSide Pipeline Attack
BlackMatter DarkSide REvil Avaddon BlackMatter Clop Conti CryptoLocker DarkSide DoppelPaymer Hades REvil
2021SecureworksSecureWorks
@online{secureworks:2021:threat:c81b928, author = {SecureWorks}, title = {{Threat Profile: GOLD EVERGREEN}}, date = {2021}, organization = {Secureworks}, url = {http://www.secureworks.com/research/threat-profiles/gold-evergreen}, language = {English}, urldate = {2021-05-28} } Threat Profile: GOLD EVERGREEN
CryptoLocker Pony Zeus GOLD EVERGREEN
2020-08Temple UniversityCARE
@online{care:202008:critical:415c34d, author = {CARE}, title = {{Critical Infrastructure Ransomware Attacks}}, date = {2020-08}, organization = {Temple University}, url = {https://sites.temple.edu/care/ci-rw-attacks/}, language = {English}, urldate = {2020-09-15} } Critical Infrastructure Ransomware Attacks
CryptoLocker Cryptowall DoppelPaymer FriedEx Mailto Maze REvil Ryuk SamSam WannaCryptor
2020-07-17CERT-FRCERT-FR
@techreport{certfr:20200717:malware:5c58cdf, author = {CERT-FR}, title = {{The Malware Dridex: Origins and Uses}}, date = {2020-07-17}, institution = {CERT-FR}, url = {https://www.cert.ssi.gouv.fr/uploads/CERTFR-2020-CTI-008.pdf}, language = {English}, urldate = {2020-07-20} } The Malware Dridex: Origins and Uses
Andromeda CryptoLocker Cutwail DoppelPaymer Dridex Emotet FriedEx Gameover P2P Gandcrab ISFB Murofet Necurs Predator The Thief Zeus
2020SecureworksSecureWorks
@online{secureworks:2020:gold:cbab642, author = {SecureWorks}, title = {{GOLD EVERGREEN}}, date = {2020}, organization = {Secureworks}, url = {https://www.secureworks.com/research/threat-profiles/gold-evergreen}, language = {English}, urldate = {2020-05-23} } GOLD EVERGREEN
CryptoLocker Pony Zeus
2017-05-15SecureworksCounter Threat Unit ResearchTeam
@online{researchteam:20170515:evolution:d0e74ea, author = {Counter Threat Unit ResearchTeam}, title = {{Evolution of the GOLD EVERGREEN Threat Group}}, date = {2017-05-15}, organization = {Secureworks}, url = {https://www.secureworks.com/research/evolution-of-the-gold-evergreen-threat-group}, language = {English}, urldate = {2021-05-28} } Evolution of the GOLD EVERGREEN Threat Group
CryptoLocker Dridex Dyre Gameover P2P Murofet TrickBot Zeus GOLD EVERGREEN
2015-02-06CrowdStrikeCrowdStrike
@techreport{crowdstrike:20150206:crowdstrike:fbcc37f, author = {CrowdStrike}, title = {{CrowdStrike Global Threat Intel Report 2014}}, date = {2015-02-06}, institution = {CrowdStrike}, url = {https://web.archive.org/web/20200509171721/https://raw.githubusercontent.com/fdiskyou/threat-INTel/master/2015/GlobalThreatIntelReport.pdf}, language = {English}, urldate = {2020-05-11} } CrowdStrike Global Threat Intel Report 2014
BlackPOS CryptoLocker Derusbi Elise Enfal EvilGrab Gameover P2P HttpBrowser Medusa Mirage Naikon NetTraveler pirpi PlugX Poison Ivy Sakula RAT Sinowal sykipot taidoor
2014-02-02Department of JusticeOffice of Public Affairs
@online{affairs:20140202:us:872a22b, author = {Office of Public Affairs}, title = {{U.S. Leads Multi-National Action Against “Gameover Zeus” Botnet and “Cryptolocker” Ransomware, Charges Botnet Administrator}}, date = {2014-02-02}, organization = {Department of Justice}, url = {https://www.justice.gov/opa/pr/us-leads-multi-national-action-against-gameover-zeus-botnet-and-cryptolocker-ransomware}, language = {English}, urldate = {2020-01-08} } U.S. Leads Multi-National Action Against “Gameover Zeus” Botnet and “Cryptolocker” Ransomware, Charges Botnet Administrator
CryptoLocker
2013-12-18SecureworksKeith Jarvis
@online{jarvis:20131218:cryptolocker:a15fe52, author = {Keith Jarvis}, title = {{CryptoLocker Ransomware}}, date = {2013-12-18}, organization = {Secureworks}, url = {https://www.secureworks.com/research/cryptolocker-ransomware}, language = {English}, urldate = {2019-11-27} } CryptoLocker Ransomware
CryptoLocker
Yara Rules
[TLP:WHITE] win_cryptolocker_auto (20220808 | Detects win.cryptolocker.)
rule win_cryptolocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.cryptolocker."
        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.cryptolocker"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 2bf1 8d144f 8d4eff 85c9 7823 8da42400000000 0fb7044a }
            // n = 7, score = 600
            //   2bf1                 | sub                 esi, ecx
            //   8d144f               | lea                 edx, [edi + ecx*2]
            //   8d4eff               | lea                 ecx, [esi - 1]
            //   85c9                 | test                ecx, ecx
            //   7823                 | js                  0x25
            //   8da42400000000       | lea                 esp, [esp]
            //   0fb7044a             | movzx               eax, word ptr [edx + ecx*2]

        $sequence_1 = { c706???????? c74604???????? c74608???????? 85c0 }
            // n = 4, score = 600
            //   c706????????         |                     
            //   c74604????????       |                     
            //   c74608????????       |                     
            //   85c0                 | test                eax, eax

        $sequence_2 = { 8b4eb8 85c9 740e 8b01 6a01 8b4004 03c8 }
            // n = 7, score = 600
            //   8b4eb8               | mov                 ecx, dword ptr [esi - 0x48]
            //   85c9                 | test                ecx, ecx
            //   740e                 | je                  0x10
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   6a01                 | push                1
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   03c8                 | add                 ecx, eax

        $sequence_3 = { 5f 5e b808000000 5b 8be5 5d c21000 }
            // n = 7, score = 600
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   b808000000           | mov                 eax, 8
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c21000               | ret                 0x10

        $sequence_4 = { 53 ff743008 ff15???????? 8b4604 8b4004 ff743008 }
            // n = 6, score = 600
            //   53                   | push                ebx
            //   ff743008             | push                dword ptr [eax + esi + 8]
            //   ff15????????         |                     
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   ff743008             | push                dword ptr [eax + esi + 8]

        $sequence_5 = { 7541 6a00 6880000000 6a01 }
            // n = 4, score = 600
            //   7541                 | jne                 0x43
            //   6a00                 | push                0
            //   6880000000           | push                0x80
            //   6a01                 | push                1

        $sequence_6 = { 7509 c605????????06 eb6f 83f802 }
            // n = 4, score = 600
            //   7509                 | jne                 0xb
            //   c605????????06       |                     
            //   eb6f                 | jmp                 0x71
            //   83f802               | cmp                 eax, 2

        $sequence_7 = { 720f 83f866 770a 41 }
            // n = 4, score = 600
            //   720f                 | jb                  0x11
            //   83f866               | cmp                 eax, 0x66
            //   770a                 | ja                  0xc
            //   41                   | inc                 ecx

        $sequence_8 = { 50 e8???????? 83c410 85c0 7505 8b7df8 eb02 }
            // n = 7, score = 600
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   7505                 | jne                 7
            //   8b7df8               | mov                 edi, dword ptr [ebp - 8]
            //   eb02                 | jmp                 4

        $sequence_9 = { ff75e4 57 ff15???????? 57 ff15???????? 8d45cc 50 }
            // n = 7, score = 600
            //   ff75e4               | push                dword ptr [ebp - 0x1c]
            //   57                   | push                edi
            //   ff15????????         |                     
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8d45cc               | lea                 eax, [ebp - 0x34]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 778240
}
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