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
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 (20210616 | Detects win.cryptolocker.)
rule win_cryptolocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        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 = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 8b4704 8d1408 33c9 3bc2 7316 8d9b00000000 }
            // n = 6, score = 600
            //   8b4704               | mov                 eax, dword ptr [edi + 4]
            //   8d1408               | lea                 edx, dword ptr [eax + ecx]
            //   33c9                 | xor                 ecx, ecx
            //   3bc2                 | cmp                 eax, edx
            //   7316                 | jae                 0x18
            //   8d9b00000000         | lea                 ebx, dword ptr [ebx]

        $sequence_1 = { 8bf1 57 8b4608 8d3c8504000000 8b4604 85ff 751e }
            // n = 7, score = 600
            //   8bf1                 | mov                 esi, ecx
            //   57                   | push                edi
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   8d3c8504000000       | lea                 edi, dword ptr [eax*4 + 4]
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   85ff                 | test                edi, edi
            //   751e                 | jne                 0x20

        $sequence_2 = { 8bec 8b4508 53 56 57 8bf9 8b5704 }
            // n = 7, score = 600
            //   8bec                 | mov                 ebp, esp
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8bf9                 | mov                 edi, ecx
            //   8b5704               | mov                 edx, dword ptr [edi + 4]

        $sequence_3 = { eb09 6a00 6a00 6801030000 ff37 ff15???????? 53 }
            // n = 7, score = 600
            //   eb09                 | jmp                 0xb
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6801030000           | push                0x301
            //   ff37                 | push                dword ptr [edi]
            //   ff15????????         |                     
            //   53                   | push                ebx

        $sequence_4 = { 8be5 5d c20c00 57 85f6 0f8491000000 f605????????01 }
            // n = 7, score = 600
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20c00               | ret                 0xc
            //   57                   | push                edi
            //   85f6                 | test                esi, esi
            //   0f8491000000         | je                  0x97
            //   f605????????01       |                     

        $sequence_5 = { 7403 50 ffd3 8b47e4 85c0 7403 }
            // n = 6, score = 600
            //   7403                 | je                  5
            //   50                   | push                eax
            //   ffd3                 | call                ebx
            //   8b47e4               | mov                 eax, dword ptr [edi - 0x1c]
            //   85c0                 | test                eax, eax
            //   7403                 | je                  5

        $sequence_6 = { 8d7d14 57 53 52 }
            // n = 4, score = 600
            //   8d7d14               | lea                 edi, dword ptr [ebp + 0x14]
            //   57                   | push                edi
            //   53                   | push                ebx
            //   52                   | push                edx

        $sequence_7 = { 83f8ff 7413 8d4f08 51 50 ff15???????? }
            // n = 6, score = 600
            //   83f8ff               | cmp                 eax, -1
            //   7413                 | je                  0x15
            //   8d4f08               | lea                 ecx, dword ptr [edi + 8]
            //   51                   | push                ecx
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_8 = { ff15???????? 6a08 6a00 ff35???????? ff15???????? }
            // n = 5, score = 600
            //   ff15????????         |                     
            //   6a08                 | push                8
            //   6a00                 | push                0
            //   ff35????????         |                     
            //   ff15????????         |                     

        $sequence_9 = { 85c0 7409 56 51 6a01 ffd0 }
            // n = 6, score = 600
            //   85c0                 | test                eax, eax
            //   7409                 | je                  0xb
            //   56                   | push                esi
            //   51                   | push                ecx
            //   6a01                 | push                1
            //   ffd0                 | call                eax

    condition:
        7 of them and filesize < 778240
}
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