SYMBOLCOMMON_NAMEaka. SYNONYMS
win.cryptowall (Back to overview)

Cryptowall


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References
2020-11-23Medium ryancorRyan Cornateanu
@online{cornateanu:20201123:genetic:cd446d2, author = {Ryan Cornateanu}, title = {{Genetic Analysis of CryptoWall Ransomware}}, date = {2020-11-23}, organization = {Medium ryancor}, url = {https://ryancor.medium.com/genetic-analysis-of-cryptowall-ransomware-843f86055c7f}, language = {English}, urldate = {2020-12-03} } Genetic Analysis of CryptoWall Ransomware
Cryptowall
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
2020-07-29ESET Researchwelivesecurity
@techreport{welivesecurity:20200729:threat:496355c, author = {welivesecurity}, title = {{THREAT REPORT Q2 2020}}, date = {2020-07-29}, institution = {ESET Research}, url = {https://www.welivesecurity.com/wp-content/uploads/2020/07/ESET_Threat_Report_Q22020.pdf}, language = {English}, urldate = {2020-07-30} } THREAT REPORT Q2 2020
DEFENSOR ID HiddenAd Bundlore Pirrit Agent.BTZ Cerber ClipBanker CROSSWALK Cryptowall CTB Locker DanaBot Dharma Formbook Gandcrab Grandoreiro Houdini ISFB LockBit Locky Mailto Maze Microcin Nemty NjRAT Phobos PlugX Pony REvil Socelars STOP Tinba TrickBot WannaCryptor
Yara Rules
[TLP:WHITE] win_cryptowall_auto (20210616 | Detects win.cryptowall.)
rule win_cryptowall_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.cryptowall."
        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.cryptowall"
        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 = { 55 8bec 8b4508 83c001 50 }
            // n = 5, score = 2100
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   83c001               | add                 eax, 1
            //   50                   | push                eax

        $sequence_1 = { 668945e6 b974000000 66894de8 ba65000000 668955ea }
            // n = 5, score = 2100
            //   668945e6             | mov                 word ptr [ebp - 0x1a], ax
            //   b974000000           | mov                 ecx, 0x74
            //   66894de8             | mov                 word ptr [ebp - 0x18], cx
            //   ba65000000           | mov                 edx, 0x65
            //   668955ea             | mov                 word ptr [ebp - 0x16], dx

        $sequence_2 = { e8???????? 83c408 8b0d???????? 898164010000 }
            // n = 4, score = 2100
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8b0d????????         |                     
            //   898164010000         | mov                 dword ptr [ecx + 0x164], eax

        $sequence_3 = { 8b5018 52 e8???????? 8b4028 }
            // n = 4, score = 2100
            //   8b5018               | mov                 edx, dword ptr [eax + 0x18]
            //   52                   | push                edx
            //   e8????????           |                     
            //   8b4028               | mov                 eax, dword ptr [eax + 0x28]

        $sequence_4 = { 668945e0 b973000000 66894de2 ba79000000 668955e4 b873000000 668945e6 }
            // n = 7, score = 2100
            //   668945e0             | mov                 word ptr [ebp - 0x20], ax
            //   b973000000           | mov                 ecx, 0x73
            //   66894de2             | mov                 word ptr [ebp - 0x1e], cx
            //   ba79000000           | mov                 edx, 0x79
            //   668955e4             | mov                 word ptr [ebp - 0x1c], dx
            //   b873000000           | mov                 eax, 0x73
            //   668945e6             | mov                 word ptr [ebp - 0x1a], ax

        $sequence_5 = { e8???????? 83c408 8b0d???????? 89411c }
            // n = 4, score = 2100
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8b0d????????         |                     
            //   89411c               | mov                 dword ptr [ecx + 0x1c], eax

        $sequence_6 = { e8???????? 83c408 8b0d???????? 8981ac000000 }
            // n = 4, score = 2100
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8b0d????????         |                     
            //   8981ac000000         | mov                 dword ptr [ecx + 0xac], eax

        $sequence_7 = { 6a01 6880000000 6a00 8d4de8 }
            // n = 4, score = 2100
            //   6a01                 | push                1
            //   6880000000           | push                0x80
            //   6a00                 | push                0
            //   8d4de8               | lea                 ecx, dword ptr [ebp - 0x18]

        $sequence_8 = { 750a b80d0000c0 e9???????? 837d0c00 750a }
            // n = 5, score = 2100
            //   750a                 | jne                 0xc
            //   b80d0000c0           | mov                 eax, 0xc000000d
            //   e9????????           |                     
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   750a                 | jne                 0xc

        $sequence_9 = { c745f800000000 837d0800 750b 837d0c00 7505 }
            // n = 5, score = 2100
            //   c745f800000000       | mov                 dword ptr [ebp - 8], 0
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0
            //   750b                 | jne                 0xd
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   7505                 | jne                 7

    condition:
        7 of them and filesize < 417792
}
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