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 (20211008 | Detects win.cryptolocker.)
rule win_cryptolocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        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 = "20211007"
        malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535"
        malpedia_version = "20211008"
        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 = { 8945b0 8d45a0 50 8975a0 c745a400000000 c745a800000000 c745ac00000000 }
            // n = 7, score = 600
            //   8945b0               | mov                 dword ptr [ebp - 0x50], eax
            //   8d45a0               | lea                 eax, dword ptr [ebp - 0x60]
            //   50                   | push                eax
            //   8975a0               | mov                 dword ptr [ebp - 0x60], esi
            //   c745a400000000       | mov                 dword ptr [ebp - 0x5c], 0
            //   c745a800000000       | mov                 dword ptr [ebp - 0x58], 0
            //   c745ac00000000       | mov                 dword ptr [ebp - 0x54], 0

        $sequence_1 = { 85d2 740d 52 ff7510 53 e8???????? 83c40c }
            // n = 7, score = 600
            //   85d2                 | test                edx, edx
            //   740d                 | je                  0xf
            //   52                   | push                edx
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_2 = { 8b45ec 2b45e8 40 3945f0 0f9cc0 84c0 7467 }
            // n = 7, score = 600
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   2b45e8               | sub                 eax, dword ptr [ebp - 0x18]
            //   40                   | inc                 eax
            //   3945f0               | cmp                 dword ptr [ebp - 0x10], eax
            //   0f9cc0               | setl                al
            //   84c0                 | test                al, al
            //   7467                 | je                  0x69

        $sequence_3 = { c21800 8b451c f6400c40 740b 5f 5e 33c0 }
            // n = 7, score = 600
            //   c21800               | ret                 0x18
            //   8b451c               | mov                 eax, dword ptr [ebp + 0x1c]
            //   f6400c40             | test                byte ptr [eax + 0xc], 0x40
            //   740b                 | je                  0xd
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   33c0                 | xor                 eax, eax

        $sequence_4 = { 8bf1 8bda 85f6 0f8487000000 0fb70e }
            // n = 5, score = 600
            //   8bf1                 | mov                 esi, ecx
            //   8bda                 | mov                 ebx, edx
            //   85f6                 | test                esi, esi
            //   0f8487000000         | je                  0x8d
            //   0fb70e               | movzx               ecx, word ptr [esi]

        $sequence_5 = { 2945d8 8b4dcc 294dd4 8945e0 8d45dc 50 ff7614 }
            // n = 7, score = 600
            //   2945d8               | sub                 dword ptr [ebp - 0x28], eax
            //   8b4dcc               | mov                 ecx, dword ptr [ebp - 0x34]
            //   294dd4               | sub                 dword ptr [ebp - 0x2c], ecx
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   8d45dc               | lea                 eax, dword ptr [ebp - 0x24]
            //   50                   | push                eax
            //   ff7614               | push                dword ptr [esi + 0x14]

        $sequence_6 = { 8be5 5d c21800 668b7d14 53 668b5d1c 0fb7cf }
            // n = 7, score = 600
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c21800               | ret                 0x18
            //   668b7d14             | mov                 di, word ptr [ebp + 0x14]
            //   53                   | push                ebx
            //   668b5d1c             | mov                 bx, word ptr [ebp + 0x1c]
            //   0fb7cf               | movzx               ecx, di

        $sequence_7 = { 51 57 8bfa 85ff 7504 33c9 eb20 }
            // n = 7, score = 600
            //   51                   | push                ecx
            //   57                   | push                edi
            //   8bfa                 | mov                 edi, edx
            //   85ff                 | test                edi, edi
            //   7504                 | jne                 6
            //   33c9                 | xor                 ecx, ecx
            //   eb20                 | jmp                 0x22

        $sequence_8 = { ff35???????? ff15???????? 68a0000000 ff15???????? 5f 5e 33c0 }
            // n = 7, score = 600
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   68a0000000           | push                0xa0
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   33c0                 | xor                 eax, eax

        $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, dword ptr [ebp - 0x34]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 778240
}
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