SYMBOLCOMMON_NAMEaka. SYNONYMS
win.defray (Back to overview)

Defray

aka: Glushkov

Defray is ransomware that appeared in 2017, and is targeted ransomware, mainly on the healthcare vertical.

The distribution of Defray has several notable characteristics:
According to Proofpoint:
"
Defray is currently being spread via Microsoft Word document attachments in email
The campaigns are as small as several messages each
The lures are custom crafted to appeal to the intended set of potential victims
The recipients are individuals or distribution lists, e.g., group@ and websupport@
Geographic targeting is in the UK and US
Vertical targeting varies by campaign and is narrow and selective
"

References
2020-11-20Trend MicroAbraham Camba, Bren Matthew Ebriega, Gilbert Sison
@online{camba:20201120:weaponizing:e15699d, author = {Abraham Camba and Bren Matthew Ebriega and Gilbert Sison}, title = {{Weaponizing Open Source Software for Targeted Attacks}}, date = {2020-11-20}, organization = {Trend Micro}, url = {https://www.trendmicro.com/en_us/research/20/k/weaponizing-open-source-software-for-targeted-attacks.html}, language = {English}, urldate = {2020-11-23} } Weaponizing Open Source Software for Targeted Attacks
LaZagne Defray PlugX
2020-11-06Palo Alto Networks Unit 42Ryan Tracey, Drew Schmitt, CRYPSIS
@online{tracey:20201106:next:c911bb5, author = {Ryan Tracey and Drew Schmitt and CRYPSIS}, title = {{Next Up: “PyXie Lite”}}, date = {2020-11-06}, organization = {Palo Alto Networks Unit 42}, url = {https://unit42.paloaltonetworks.com/vatet-pyxie-defray777/2/}, language = {English}, urldate = {2020-11-09} } Next Up: “PyXie Lite”
Defray PyXie
2020-09-23Bleeping ComputerLawrence Abrams
@online{abrams:20200923:government:bf7b212, author = {Lawrence Abrams}, title = {{Government software provider Tyler Technologies hit by ransomware}}, date = {2020-09-23}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/government-software-provider-tyler-technologies-hit-by-ransomware/}, language = {English}, urldate = {2020-10-02} } Government software provider Tyler Technologies hit by ransomware
Defray
2020-02-25RSA ConferenceJoel DeCapua
@online{decapua:20200225:feds:423f929, author = {Joel DeCapua}, title = {{Feds Fighting Ransomware: How the FBI Investigates and How You Can Help}}, date = {2020-02-25}, organization = {RSA Conference}, url = {https://www.youtube.com/watch?v=LUxOcpIRxmg}, language = {English}, urldate = {2020-03-04} } Feds Fighting Ransomware: How the FBI Investigates and How You Can Help
FastCash Cerber Defray Dharma FriedEx Gandcrab GlobeImposter Mamba Phobos Rapid Ransom REvil Ryuk SamSam Zeus
2020-01-17SecureworksTamada Kiyotaka, Keita Yamazaki, You Nakatsuru
@techreport{kiyotaka:20200117:is:969ff38, author = {Tamada Kiyotaka and Keita Yamazaki and You Nakatsuru}, title = {{Is It Wrong to Try to Find APT Techniques in Ransomware Attack?}}, date = {2020-01-17}, institution = {Secureworks}, url = {https://jsac.jpcert.or.jp/archive/2020/pdf/JSAC2020_1_tamada-yamazaki-nakatsuru_en.pdf}, language = {English}, urldate = {2020-04-06} } Is It Wrong to Try to Find APT Techniques in Ransomware Attack?
Defray Dharma FriedEx Gandcrab GlobeImposter Matrix Ransom MedusaLocker Phobos REvil Ryuk SamSam Scarab Ransomware
2020SecureworksSecureWorks
@online{secureworks:2020:gold:8050e44, author = {SecureWorks}, title = {{GOLD DUPONT}}, date = {2020}, organization = {Secureworks}, url = {https://www.secureworks.com/research/threat-profiles/gold-dupont}, language = {English}, urldate = {2020-05-23} } GOLD DUPONT
Cobalt Strike Defray PyXie GOLD DUPONT
2017-09-26Threat VectorCylance Threat Research Team
@online{team:20170926:defray:8bab4ad, author = {Cylance Threat Research Team}, title = {{Defray Ransomware Hits Healthcare and Education}}, date = {2017-09-26}, organization = {Threat Vector}, url = {https://threatvector.cylance.com/en_us/home/threat-spotlight-defray-ransomware-hits-healthcare-and-education.html}, language = {English}, urldate = {2020-01-07} } Defray Ransomware Hits Healthcare and Education
Defray
2017-08-24ProofpointProofpoint Staff
@online{staff:20170824:new:51577f3, author = {Proofpoint Staff}, title = {{New Defray Ransomware Targets Education and Healthcare Verticals}}, date = {2017-08-24}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/blog/threat-insight/new-defray-ransomware-targets-education-and-healthcare-verticals}, language = {English}, urldate = {2021-02-09} } New Defray Ransomware Targets Education and Healthcare Verticals
Defray
2017-08-24ProofpointProofpoint Staff
@online{staff:20170824:defray:1b0f056, author = {Proofpoint Staff}, title = {{Defray - New Ransomware Targeting Education and Healthcare Verticals}}, date = {2017-08-24}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/threat-insight/post/defray-new-ransomware-targeting-education-and-healthcare-verticals}, language = {English}, urldate = {2020-01-10} } Defray - New Ransomware Targeting Education and Healthcare Verticals
Defray
Yara Rules
[TLP:WHITE] win_defray_auto (20210616 | Detects win.defray.)
rule win_defray_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.defray."
        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.defray"
        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 = { 663bc1 75f4 a1???????? 8d950cf7ffff 8907 8bf2 }
            // n = 6, score = 200
            //   663bc1               | cmp                 ax, cx
            //   75f4                 | jne                 0xfffffff6
            //   a1????????           |                     
            //   8d950cf7ffff         | lea                 edx, dword ptr [ebp - 0x8f4]
            //   8907                 | mov                 dword ptr [edi], eax
            //   8bf2                 | mov                 esi, edx

        $sequence_1 = { 8d4dc8 8975c4 0f94c3 83c704 57 e8???????? 8b470c }
            // n = 7, score = 200
            //   8d4dc8               | lea                 ecx, dword ptr [ebp - 0x38]
            //   8975c4               | mov                 dword ptr [ebp - 0x3c], esi
            //   0f94c3               | sete                bl
            //   83c704               | add                 edi, 4
            //   57                   | push                edi
            //   e8????????           |                     
            //   8b470c               | mov                 eax, dword ptr [edi + 0xc]

        $sequence_2 = { 33ff 8bc7 eb07 1bc0 83c801 33ff 85c0 }
            // n = 7, score = 200
            //   33ff                 | xor                 edi, edi
            //   8bc7                 | mov                 eax, edi
            //   eb07                 | jmp                 9
            //   1bc0                 | sbb                 eax, eax
            //   83c801               | or                  eax, 1
            //   33ff                 | xor                 edi, edi
            //   85c0                 | test                eax, eax

        $sequence_3 = { e9???????? 8d4dd0 e9???????? 8d4dec e9???????? 8d8d30feffff }
            // n = 6, score = 200
            //   e9????????           |                     
            //   8d4dd0               | lea                 ecx, dword ptr [ebp - 0x30]
            //   e9????????           |                     
            //   8d4dec               | lea                 ecx, dword ptr [ebp - 0x14]
            //   e9????????           |                     
            //   8d8d30feffff         | lea                 ecx, dword ptr [ebp - 0x1d0]

        $sequence_4 = { 8b4508 83f809 0f8791000000 ff24851e1a4500 ff7510 ff750c e8???????? }
            // n = 7, score = 200
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   83f809               | cmp                 eax, 9
            //   0f8791000000         | ja                  0x97
            //   ff24851e1a4500       | jmp                 dword ptr [eax*4 + 0x451a1e]
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     

        $sequence_5 = { 8d858ce5ffff 50 ffd1 85c0 0f85b7000000 50 50 }
            // n = 7, score = 200
            //   8d858ce5ffff         | lea                 eax, dword ptr [ebp - 0x1a74]
            //   50                   | push                eax
            //   ffd1                 | call                ecx
            //   85c0                 | test                eax, eax
            //   0f85b7000000         | jne                 0xbd
            //   50                   | push                eax
            //   50                   | push                eax

        $sequence_6 = { 8ac5 243f 884dea 8845eb 833d????????10 b8???????? }
            // n = 6, score = 200
            //   8ac5                 | mov                 al, ch
            //   243f                 | and                 al, 0x3f
            //   884dea               | mov                 byte ptr [ebp - 0x16], cl
            //   8845eb               | mov                 byte ptr [ebp - 0x15], al
            //   833d????????10       |                     
            //   b8????????           |                     

        $sequence_7 = { 8bec 51 53 8b1d???????? 8bc3 2b05???????? 56 }
            // n = 7, score = 200
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   8b1d????????         |                     
            //   8bc3                 | mov                 eax, ebx
            //   2b05????????         |                     
            //   56                   | push                esi

        $sequence_8 = { a5 a5 66a5 8dbdbef6ffff be???????? ab ab }
            // n = 7, score = 200
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   66a5                 | movsw               word ptr es:[edi], word ptr [esi]
            //   8dbdbef6ffff         | lea                 edi, dword ptr [ebp - 0x942]
            //   be????????           |                     
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ab                   | stosd               dword ptr es:[edi], eax

        $sequence_9 = { 68c0000000 898538ffffff 8d853cffffff 53 50 e8???????? 8d8514fcffff }
            // n = 7, score = 200
            //   68c0000000           | push                0xc0
            //   898538ffffff         | mov                 dword ptr [ebp - 0xc8], eax
            //   8d853cffffff         | lea                 eax, dword ptr [ebp - 0xc4]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d8514fcffff         | lea                 eax, dword ptr [ebp - 0x3ec]

    condition:
        7 of them and filesize < 1253376
}
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