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 (20220411 | Detects win.cryptolocker.)
rule win_cryptolocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        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 = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 8bda 894df8 85f6 7906 85db 757d }
            // n = 6, score = 600
            //   8bda                 | mov                 ebx, edx
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   85f6                 | test                esi, esi
            //   7906                 | jns                 8
            //   85db                 | test                ebx, ebx
            //   757d                 | jne                 0x7f

        $sequence_1 = { 68???????? ff15???????? 6801100000 6a08 ff35???????? ff15???????? 8bf0 }
            // n = 7, score = 600
            //   68????????           |                     
            //   ff15????????         |                     
            //   6801100000           | push                0x1001
            //   6a08                 | push                8
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_2 = { 6a00 ff35???????? ff15???????? 33c0 81fe03010000 0f44f0 f645fb01 }
            // n = 7, score = 600
            //   6a00                 | push                0
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   81fe03010000         | cmp                 esi, 0x103
            //   0f44f0               | cmove               esi, eax
            //   f645fb01             | test                byte ptr [ebp - 5], 1

        $sequence_3 = { 85c0 740a 56 ff36 6a00 ffd0 83c40c }
            // n = 7, score = 600
            //   85c0                 | test                eax, eax
            //   740a                 | je                  0xc
            //   56                   | push                esi
            //   ff36                 | push                dword ptr [esi]
            //   6a00                 | push                0
            //   ffd0                 | call                eax
            //   83c40c               | add                 esp, 0xc

        $sequence_4 = { 5e 5d c20c00 5f b8ea000000 }
            // n = 5, score = 600
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c20c00               | ret                 0xc
            //   5f                   | pop                 edi
            //   b8ea000000           | mov                 eax, 0xea

        $sequence_5 = { ff15???????? 85c0 74d8 85f6 740e 85ff }
            // n = 6, score = 600
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   74d8                 | je                  0xffffffda
            //   85f6                 | test                esi, esi
            //   740e                 | je                  0x10
            //   85ff                 | test                edi, edi

        $sequence_6 = { 56 ff36 6a00 ffd0 83c40c 8b4518 0f57c0 }
            // n = 7, score = 600
            //   56                   | push                esi
            //   ff36                 | push                dword ptr [esi]
            //   6a00                 | push                0
            //   ffd0                 | call                eax
            //   83c40c               | add                 esp, 0xc
            //   8b4518               | mov                 eax, dword ptr [ebp + 0x18]
            //   0f57c0               | xorps               xmm0, xmm0

        $sequence_7 = { ff15???????? 8d4de8 51 ff75ec 6a4e }
            // n = 5, score = 600
            //   ff15????????         |                     
            //   8d4de8               | lea                 ecx, dword ptr [ebp - 0x18]
            //   51                   | push                ecx
            //   ff75ec               | push                dword ptr [ebp - 0x14]
            //   6a4e                 | push                0x4e

        $sequence_8 = { 8b4d10 f6c101 7556 8b450c 83f801 7405 83f802 }
            // n = 7, score = 600
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   f6c101               | test                cl, 1
            //   7556                 | jne                 0x58
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   83f801               | cmp                 eax, 1
            //   7405                 | je                  7
            //   83f802               | cmp                 eax, 2

        $sequence_9 = { 833d????????02 0f8544010000 a0???????? 3c01 757a }
            // n = 5, score = 600
            //   833d????????02       |                     
            //   0f8544010000         | jne                 0x14a
            //   a0????????           |                     
            //   3c01                 | cmp                 al, 1
            //   757a                 | jne                 0x7c

    condition:
        7 of them and filesize < 778240
}
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