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 (20230125 | Detects win.cryptolocker.)
rule win_cryptolocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8b35???????? c745e800000000 c745e400000000 897df0 ffd6 8bf8 8b45fc }
            // n = 7, score = 600
            //   8b35????????         |                     
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0
            //   c745e400000000       | mov                 dword ptr [ebp - 0x1c], 0
            //   897df0               | mov                 dword ptr [ebp - 0x10], edi
            //   ffd6                 | call                esi
            //   8bf8                 | mov                 edi, eax
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_1 = { eb0d 8bcb eb09 8bca }
            // n = 4, score = 600
            //   eb0d                 | jmp                 0xf
            //   8bcb                 | mov                 ecx, ebx
            //   eb09                 | jmp                 0xb
            //   8bca                 | mov                 ecx, edx

        $sequence_2 = { 5b 8be5 5d c3 c745fc00000000 8bc6 8945e4 }
            // n = 7, score = 600
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   8bc6                 | mov                 eax, esi
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax

        $sequence_3 = { 8b15???????? 8b4618 85c0 740e 50 6a00 ff35???????? }
            // n = 7, score = 600
            //   8b15????????         |                     
            //   8b4618               | mov                 eax, dword ptr [esi + 0x18]
            //   85c0                 | test                eax, eax
            //   740e                 | je                  0x10
            //   50                   | push                eax
            //   6a00                 | push                0
            //   ff35????????         |                     

        $sequence_4 = { 85c0 740e 50 ff15???????? c746f400000000 8b46e4 8b4004 }
            // n = 7, score = 600
            //   85c0                 | test                eax, eax
            //   740e                 | je                  0x10
            //   50                   | push                eax
            //   ff15????????         |                     
            //   c746f400000000       | mov                 dword ptr [esi - 0xc], 0
            //   8b46e4               | mov                 eax, dword ptr [esi - 0x1c]
            //   8b4004               | mov                 eax, dword ptr [eax + 4]

        $sequence_5 = { 7507 8b55fc 85d2 79c9 83c8ff 5f }
            // n = 6, score = 600
            //   7507                 | jne                 9
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   85d2                 | test                edx, edx
            //   79c9                 | jns                 0xffffffcb
            //   83c8ff               | or                  eax, 0xffffffff
            //   5f                   | pop                 edi

        $sequence_6 = { 55 8bec 56 8b750c 8d8600ffffff 83f801 7723 }
            // n = 7, score = 600
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   56                   | push                esi
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   8d8600ffffff         | lea                 eax, [esi - 0x100]
            //   83f801               | cmp                 eax, 1
            //   7723                 | ja                  0x25

        $sequence_7 = { 81ffffffff7f 773d 33d2 8bc7 85ff }
            // n = 5, score = 600
            //   81ffffffff7f         | cmp                 edi, 0x7fffffff
            //   773d                 | ja                  0x3f
            //   33d2                 | xor                 edx, edx
            //   8bc7                 | mov                 eax, edi
            //   85ff                 | test                edi, edi

        $sequence_8 = { 83ec14 53 57 6a00 ff7510 8bd9 ff750c }
            // n = 7, score = 600
            //   83ec14               | sub                 esp, 0x14
            //   53                   | push                ebx
            //   57                   | push                edi
            //   6a00                 | push                0
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   8bd9                 | mov                 ebx, ecx
            //   ff750c               | push                dword ptr [ebp + 0xc]

        $sequence_9 = { 8d550c 52 50 ff7508 ff31 ff15???????? }
            // n = 6, score = 600
            //   8d550c               | lea                 edx, [ebp + 0xc]
            //   52                   | push                edx
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff31                 | push                dword ptr [ecx]
            //   ff15????????         |                     

    condition:
        7 of them and filesize < 778240
}
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