SYMBOLCOMMON_NAMEaka. SYNONYMS
win.stop (Back to overview)

STOP Ransomware

aka: KeyPass, Djvu

STOP Djvu Ransomware it is a ransomware which encrypts user data through AES-256 and adds one of the dozen available extensions as marker to the encrypted file's name. It is not used to encrypt the entire file but only the first 5 MB. In its original version it was able to run offline and, in that case, it used a hard-coded key which could be extracted to decrypt files.

References
2021-01-18Medium csis-techblogBenoît Ancel
@online{ancel:20210118:gcleaner:f8b9064, author = {Benoît Ancel}, title = {{GCleaner — Garbage Provider Since 2019}}, date = {2021-01-18}, organization = {Medium csis-techblog}, url = {https://medium.com/csis-techblog/gcleaner-garbage-provider-since-2019-2708e7c87a8a}, language = {English}, urldate = {2021-01-21} } GCleaner — Garbage Provider Since 2019
Amadey Ficker Stealer Raccoon RedLine Stealer SmokeLoader STOP Ransomware
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 Ransomware PlugX Pony REvil Socelars STOP Ransomware Tinba TrickBot WannaCryptor
2020-02-05CybereasonLior Rochberger, Assaf Dahan
@online{rochberger:20200205:hole:b982e31, author = {Lior Rochberger and Assaf Dahan}, title = {{The Hole in the Bucket: Attackers Abuse Bitbucket to Deliver an Arsenal of Malware}}, date = {2020-02-05}, organization = {Cybereason}, url = {https://www.cybereason.com/blog/the-hole-in-the-bucket-attackers-abuse-bitbucket-to-deliver-an-arsenal-of-malware}, language = {English}, urldate = {2020-02-09} } The Hole in the Bucket: Attackers Abuse Bitbucket to Deliver an Arsenal of Malware
Amadey Azorult Predator The Thief STOP Ransomware vidar
2020BlackberryBlackberry Research
@techreport{research:2020:state:e5941af, author = {Blackberry Research}, title = {{State of Ransomware}}, date = {2020}, institution = {Blackberry}, url = {https://www.blackberry.com/content/dam/blackberry-com/asset/enterprise/pdf/wp-spark-state-of-ransomware.pdf}, language = {English}, urldate = {2021-01-01} } State of Ransomware
Maze MedusaLocker Nefilim Ransomware Phobos Ransomware REvil Ryuk STOP Ransomware Zeppelin Ransomware
2019-12-11Kaspersky LabsKaspersky
@online{kaspersky:20191211:story:d54a08a, author = {Kaspersky}, title = {{Story of the year 2019: Cities under ransomware siege}}, date = {2019-12-11}, organization = {Kaspersky Labs}, url = {https://securelist.com/story-of-the-year-2019-cities-under-ransomware-siege/95456/}, language = {English}, urldate = {2020-01-13} } Story of the year 2019: Cities under ransomware siege
Scarab Ransomware STOP Ransomware
2019-11-21G DataKarsten Hahn, Stefan Karpenstein
@online{hahn:20191121:stop:a5c8118, author = {Karsten Hahn and Stefan Karpenstein}, title = {{STOP Ransomware: Finger weg von illegalen Software-Downloads}}, date = {2019-11-21}, organization = {G Data}, url = {https://www.gdata.de/blog/1970/01/-35391-finger-weg-von-illegalen-software-downloads}, language = {English}, urldate = {2020-01-10} } STOP Ransomware: Finger weg von illegalen Software-Downloads
STOP Ransomware
2019-01-15Bleeping ComputerLawrence Abrams
@online{abrams:20190115:djvu:a8b1d06, author = {Lawrence Abrams}, title = {{Djvu Ransomware Spreading New .TRO Variant Through Cracks & Adware Bundles}}, date = {2019-01-15}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/djvu-ransomware-spreading-new-tro-variant-through-cracks-and-adware-bundles/}, language = {English}, urldate = {2019-12-20} } Djvu Ransomware Spreading New .TRO Variant Through Cracks & Adware Bundles
STOP Ransomware
2018-08-13Kaspersky LabsOrkhan Mamedov, Fedor Sinitsyn
@online{mamedov:20180813:keypass:154cf0f, author = {Orkhan Mamedov and Fedor Sinitsyn}, title = {{KeyPass ransomware}}, date = {2018-08-13}, organization = {Kaspersky Labs}, url = {https://securelist.com/keypass-ransomware/87412/}, language = {English}, urldate = {2019-12-20} } KeyPass ransomware
STOP Ransomware
Yara Rules
[TLP:WHITE] win_stop_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_stop_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.stop"
        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 = { 6a12 ff33 ff15???????? 8b35???????? 8b3d???????? }
            // n = 5, score = 400
            //   6a12                 | push                0x12
            //   ff33                 | push                dword ptr [ebx]
            //   ff15????????         |                     
            //   8b35????????         |                     
            //   8b3d????????         |                     

        $sequence_1 = { 8d45e0 50 ffd6 85c0 75e2 6a64 ff15???????? }
            // n = 7, score = 400
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   75e2                 | jne                 0xffffffe4
            //   6a64                 | push                0x64
            //   ff15????????         |                     

        $sequence_2 = { 6a00 6a12 ff33 ff15???????? 8b35???????? 8b3d???????? }
            // n = 6, score = 400
            //   6a00                 | push                0
            //   6a12                 | push                0x12
            //   ff33                 | push                dword ptr [ebx]
            //   ff15????????         |                     
            //   8b35????????         |                     
            //   8b3d????????         |                     

        $sequence_3 = { 83c102 eb84 6a0c 68???????? e8???????? 8b7d08 }
            // n = 6, score = 400
            //   83c102               | add                 ecx, 2
            //   eb84                 | jmp                 0xffffff86
            //   6a0c                 | push                0xc
            //   68????????           |                     
            //   e8????????           |                     
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]

        $sequence_4 = { e8???????? 83c404 8b4b04 b8abaaaa2a 2b0b }
            // n = 5, score = 400
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b4b04               | mov                 ecx, dword ptr [ebx + 4]
            //   b8abaaaa2a           | mov                 eax, 0x2aaaaaab
            //   2b0b                 | sub                 ecx, dword ptr [ebx]

        $sequence_5 = { ffd6 85c0 75e8 6a0a ff7304 ff15???????? 3d02010000 }
            // n = 7, score = 400
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   75e8                 | jne                 0xffffffea
            //   6a0a                 | push                0xa
            //   ff7304               | push                dword ptr [ebx + 4]
            //   ff15????????         |                     
            //   3d02010000           | cmp                 eax, 0x102

        $sequence_6 = { e8???????? 83c404 33c0 c7463c07000000 c7463800000000 }
            // n = 5, score = 400
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   33c0                 | xor                 eax, eax
            //   c7463c07000000       | mov                 dword ptr [esi + 0x3c], 7
            //   c7463800000000       | mov                 dword ptr [esi + 0x38], 0

        $sequence_7 = { 56 6a00 ff7508 68???????? 6a00 6a00 ff15???????? }
            // n = 7, score = 400
            //   56                   | push                esi
            //   6a00                 | push                0
            //   ff7508               | push                dword ptr [ebp + 8]
            //   68????????           |                     
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff15????????         |                     

        $sequence_8 = { 51 51 dd1c24 e8???????? dc4de0 }
            // n = 5, score = 400
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   dd1c24               | fstp                qword ptr [esp]
            //   e8????????           |                     
            //   dc4de0               | fmul                qword ptr [ebp - 0x20]

        $sequence_9 = { ff7508 ffd0 5d c3 8b0d???????? 33d2 85c9 }
            // n = 7, score = 400
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ffd0                 | call                eax
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b0d????????         |                     
            //   33d2                 | xor                 edx, edx
            //   85c9                 | test                ecx, ecx

    condition:
        7 of them and filesize < 6029312
}
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