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
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
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 (20201014 | autogenerated rule brought to you by yara-signator)
rule win_cryptolocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cryptolocker"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 33c0 5b 8be5 5d c21800 8b451c f6400c20 }
            // n = 7, score = 600
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c21800               | ret                 0x18
            //   8b451c               | mov                 eax, dword ptr [ebp + 0x1c]
            //   f6400c20             | test                byte ptr [eax + 0xc], 0x20

        $sequence_1 = { 8be5 5d c21000 50 8d4ba0 e8???????? 0fb6c8 }
            // n = 7, score = 600
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c21000               | ret                 0x10
            //   50                   | push                eax
            //   8d4ba0               | lea                 ecx, [ebx - 0x60]
            //   e8????????           |                     
            //   0fb6c8               | movzx               ecx, al

        $sequence_2 = { 8b1d???????? 8b4514 833800 0f84e1feffff 85ff 7441 }
            // n = 6, score = 600
            //   8b1d????????         |                     
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]
            //   833800               | cmp                 dword ptr [eax], 0
            //   0f84e1feffff         | je                  0xfffffee7
            //   85ff                 | test                edi, edi
            //   7441                 | je                  0x43

        $sequence_3 = { 5f 5e 5b 8be5 5d c20400 8d85acfdffff }
            // n = 7, score = 600
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   8d85acfdffff         | lea                 eax, [ebp - 0x254]

        $sequence_4 = { 0f8491010000 8b06 8d4dc0 51 ff7508 }
            // n = 5, score = 600
            //   0f8491010000         | je                  0x197
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8d4dc0               | lea                 ecx, [ebp - 0x40]
            //   51                   | push                ecx
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_5 = { 3b5dfc 76a3 5e 5b 33c0 5f }
            // n = 6, score = 600
            //   3b5dfc               | cmp                 ebx, dword ptr [ebp - 4]
            //   76a3                 | jbe                 0xffffffa5
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   33c0                 | xor                 eax, eax
            //   5f                   | pop                 edi

        $sequence_6 = { 750b 5f b857000780 5b 5d c21400 bf7a000780 }
            // n = 7, score = 600
            //   750b                 | jne                 0xd
            //   5f                   | pop                 edi
            //   b857000780           | mov                 eax, 0x80070057
            //   5b                   | pop                 ebx
            //   5d                   | pop                 ebp
            //   c21400               | ret                 0x14
            //   bf7a000780           | mov                 edi, 0x8007007a

        $sequence_7 = { 8b45fc 894604 eb02 33f6 8b07 57 }
            // n = 6, score = 600
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   894604               | mov                 dword ptr [esi + 4], eax
            //   eb02                 | jmp                 4
            //   33f6                 | xor                 esi, esi
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   57                   | push                edi

        $sequence_8 = { 57 8bf9 85d2 7906 }
            // n = 4, score = 600
            //   57                   | push                edi
            //   8bf9                 | mov                 edi, ecx
            //   85d2                 | test                edx, edx
            //   7906                 | jns                 8

        $sequence_9 = { 8b4004 ff743024 ff15???????? 8bd8 85db 743b 8d45ec }
            // n = 7, score = 600
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   ff743024             | push                dword ptr [eax + esi + 0x24]
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   85db                 | test                ebx, ebx
            //   743b                 | je                  0x3d
            //   8d45ec               | lea                 eax, [ebp - 0x14]

    condition:
        7 of them and filesize < 778240
}
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