SYMBOLCOMMON_NAMEaka. SYNONYMS
win.stop (Back to overview)

STOP

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
2021-10-31CYBER GEEKS All Things InfosecCyberMasterV
@online{cybermasterv:20211031:detailed:290dacf, author = {CyberMasterV}, title = {{A detailed analysis of the STOP/Djvu Ransomware}}, date = {2021-10-31}, organization = {CYBER GEEKS All Things Infosec}, url = {https://cybergeeks.tech/a-detailed-analysis-of-the-stop-djvu-ransomware/}, language = {English}, urldate = {2021-11-08} } A detailed analysis of the STOP/Djvu Ransomware
STOP
2021-06-21cyblecybleinc
@online{cybleinc:20210621:djvu:7e58962, author = {cybleinc}, title = {{DJVU Malware of STOP Ransomware Family Back with New Variant}}, date = {2021-06-21}, organization = {cyble}, url = {https://cybleinc.com/2021/06/21/djvu-malware-of-stop-ransomware-family-back-with-new-variant/}, language = {English}, urldate = {2021-06-24} } DJVU Malware of STOP Ransomware Family Back with New Variant
STOP
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
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
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 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 Phobos REvil Ryuk STOP
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
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
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
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
Yara Rules
[TLP:WHITE] win_stop_auto (20211008 | Detects win.stop.)
rule win_stop_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        version = "1"
        description = "Detects win.stop."
        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.stop"
        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 = { 6a00 ff15???????? 33c9 894604 }
            // n = 4, score = 400
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   33c9                 | xor                 ecx, ecx
            //   894604               | mov                 dword ptr [esi + 4], eax

        $sequence_1 = { ff750c ff7508 ffd0 5d c3 8b0d???????? }
            // n = 6, score = 400
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ffd0                 | call                eax
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b0d????????         |                     

        $sequence_2 = { 85c0 75e8 6a0a ff7304 }
            // n = 4, score = 400
            //   85c0                 | test                eax, eax
            //   75e8                 | jne                 0xffffffea
            //   6a0a                 | push                0xa
            //   ff7304               | push                dword ptr [ebx + 4]

        $sequence_3 = { ffd0 5d c3 8b0d???????? 33d2 }
            // n = 5, score = 400
            //   ffd0                 | call                eax
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b0d????????         |                     
            //   33d2                 | xor                 edx, edx

        $sequence_4 = { ffd0 5d c3 8b0d???????? }
            // n = 4, score = 400
            //   ffd0                 | call                eax
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b0d????????         |                     

        $sequence_5 = { 85c0 75e8 6a0a ff7304 ff15???????? 3d02010000 74c4 }
            // n = 7, score = 400
            //   85c0                 | test                eax, eax
            //   75e8                 | jne                 0xffffffea
            //   6a0a                 | push                0xa
            //   ff7304               | push                dword ptr [ebx + 4]
            //   ff15????????         |                     
            //   3d02010000           | cmp                 eax, 0x102
            //   74c4                 | je                  0xffffffc6

        $sequence_6 = { eb14 8bce 8d5902 668b01 83c102 }
            // n = 5, score = 400
            //   eb14                 | jmp                 0x16
            //   8bce                 | mov                 ecx, esi
            //   8d5902               | lea                 ebx, dword ptr [ecx + 2]
            //   668b01               | mov                 ax, word ptr [ecx]
            //   83c102               | add                 ecx, 2

        $sequence_7 = { ffd6 85c0 75e8 6a0a ff7304 }
            // n = 5, score = 400
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   75e8                 | jne                 0xffffffea
            //   6a0a                 | push                0xa
            //   ff7304               | push                dword ptr [ebx + 4]

        $sequence_8 = { 50 6a00 6a00 6a48 6a00 }
            // n = 5, score = 400
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a48                 | push                0x48
            //   6a00                 | push                0

        $sequence_9 = { 85c0 75e2 6a64 ff15???????? ffd3 }
            // n = 5, score = 400
            //   85c0                 | test                eax, eax
            //   75e2                 | jne                 0xffffffe4
            //   6a64                 | push                0x64
            //   ff15????????         |                     
            //   ffd3                 | call                ebx

    condition:
        7 of them and filesize < 6029312
}
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