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 (20201023 | autogenerated rule brought to you by yara-signator)
rule win_cryptolocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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 = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 0fb7c3 03c8 7422 c1e103 85c9 7504 }
            // n = 6, score = 600
            //   0fb7c3               | movzx               eax, bx
            //   03c8                 | add                 ecx, eax
            //   7422                 | je                  0x24
            //   c1e103               | shl                 ecx, 3
            //   85c9                 | test                ecx, ecx
            //   7504                 | jne                 6

        $sequence_1 = { 8d0413 50 ff15???????? 8b5514 83c40c 85d2 740d }
            // n = 7, score = 600
            //   8d0413               | lea                 eax, [ebx + edx]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b5514               | mov                 edx, dword ptr [ebp + 0x14]
            //   83c40c               | add                 esp, 0xc
            //   85d2                 | test                edx, edx
            //   740d                 | je                  0xf

        $sequence_2 = { 3bc2 72f0 32c0 5f 5e 5b 8be5 }
            // n = 7, score = 600
            //   3bc2                 | cmp                 eax, edx
            //   72f0                 | jb                  0xfffffff2
            //   32c0                 | xor                 al, al
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp

        $sequence_3 = { 5b 8be5 5d c3 8a5dfb be08000000 85ff }
            // n = 7, score = 600
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8a5dfb               | mov                 bl, byte ptr [ebp - 5]
            //   be08000000           | mov                 esi, 8
            //   85ff                 | test                edi, edi

        $sequence_4 = { 56 8b35???????? 6a00 ff35???????? ffd6 85ff 7411 }
            // n = 7, score = 600
            //   56                   | push                esi
            //   8b35????????         |                     
            //   6a00                 | push                0
            //   ff35????????         |                     
            //   ffd6                 | call                esi
            //   85ff                 | test                edi, edi
            //   7411                 | je                  0x13

        $sequence_5 = { 8b4620 85c0 740e 50 ff15???????? c7462000000000 f6450801 }
            // n = 7, score = 600
            //   8b4620               | mov                 eax, dword ptr [esi + 0x20]
            //   85c0                 | test                eax, eax
            //   740e                 | je                  0x10
            //   50                   | push                eax
            //   ff15????????         |                     
            //   c7462000000000       | mov                 dword ptr [esi + 0x20], 0
            //   f6450801             | test                byte ptr [ebp + 8], 1

        $sequence_6 = { 0f84ec000000 83fe27 0f84e3000000 83fe24 0f84da000000 83fe23 }
            // n = 6, score = 600
            //   0f84ec000000         | je                  0xf2
            //   83fe27               | cmp                 esi, 0x27
            //   0f84e3000000         | je                  0xe9
            //   83fe24               | cmp                 esi, 0x24
            //   0f84da000000         | je                  0xe0
            //   83fe23               | cmp                 esi, 0x23

        $sequence_7 = { 85ff b8???????? 0f45c7 33c9 85d2 7521 3808 }
            // n = 7, score = 600
            //   85ff                 | test                edi, edi
            //   b8????????           |                     
            //   0f45c7               | cmovne              eax, edi
            //   33c9                 | xor                 ecx, ecx
            //   85d2                 | test                edx, edx
            //   7521                 | jne                 0x23
            //   3808                 | cmp                 byte ptr [eax], cl

        $sequence_8 = { ff74240c 8bce 57 e8???????? 84c0 0f8594010000 8b06 }
            // n = 7, score = 600
            //   ff74240c             | push                dword ptr [esp + 0xc]
            //   8bce                 | mov                 ecx, esi
            //   57                   | push                edi
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   0f8594010000         | jne                 0x19a
            //   8b06                 | mov                 eax, dword ptr [esi]

        $sequence_9 = { 0f95c3 ff15???????? 84db 7435 5f 5e b001 }
            // n = 7, score = 600
            //   0f95c3               | setne               bl
            //   ff15????????         |                     
            //   84db                 | test                bl, bl
            //   7435                 | je                  0x37
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   b001                 | mov                 al, 1

    condition:
        7 of them and filesize < 778240
}
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