SYMBOLCOMMON_NAMEaka. SYNONYMS
win.jaff (Back to overview)

Jaff


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References
2020-06-22CERT-FRCERT-FR
@techreport{certfr:20200622:volution:fba1cfa, author = {CERT-FR}, title = {{Évolution De Lactivité du Groupe Cybercriminel TA505}}, date = {2020-06-22}, institution = {CERT-FR}, url = {https://www.cert.ssi.gouv.fr/uploads/CERTFR-2020-CTI-006.pdf}, language = {French}, urldate = {2020-06-24} } Évolution De Lactivité du Groupe Cybercriminel TA505
Amadey AndroMut Bart Clop Dridex FlawedGrace Gandcrab Get2 GlobeImposter Jaff Locky Marap Philadephia Ransom QuantLoader Scarab Ransomware SDBbot ServHelper Silence tRat TrickBot
2020-05-21Intel 471Intel 471
@online{471:20200521:brief:048d164, author = {Intel 471}, title = {{A brief history of TA505}}, date = {2020-05-21}, organization = {Intel 471}, url = {https://intel471.com/blog/a-brief-history-of-ta505}, language = {English}, urldate = {2022-02-14} } A brief history of TA505
AndroMut Bart Dridex FlawedAmmyy FlawedGrace Gandcrab Get2 GlobeImposter Jaff Kegotip Locky Necurs Philadephia Ransom Pony QuantLoader Rockloader SDBbot ServHelper Shifu Snatch TrickBot
2017-05-16Malware Traffic AnalysisBrad Duncan
@online{duncan:20170516:20170516:920d589, author = {Brad Duncan}, title = {{2017-05-16 - MORE EXAMPLES OF MALSPAM PUSHING JAFF RANSOMWARE}}, date = {2017-05-16}, organization = {Malware Traffic Analysis}, url = {http://malware-traffic-analysis.net/2017/05/16/index.html}, language = {English}, urldate = {2020-01-07} } 2017-05-16 - MORE EXAMPLES OF MALSPAM PUSHING JAFF RANSOMWARE
Jaff
2017-05-11ProofpointProofpoint Staff
@online{staff:20170511:jaff:1e6dde7, author = {Proofpoint Staff}, title = {{Jaff - New Ransomware From the Actors Behind the Distribution of Dridex, Locky, and Bart}}, date = {2017-05-11}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/threat-insight/post/jaff-new-ransomware-from-actors-behind-distribution-of-dridex-locky-bart}, language = {English}, urldate = {2019-12-20} } Jaff - New Ransomware From the Actors Behind the Distribution of Dridex, Locky, and Bart
Jaff
Yara Rules
[TLP:WHITE] win_jaff_auto (20220411 | Detects win.jaff.)
rule win_jaff_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.jaff."
        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.jaff"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 8b4a04 c745f800000000 85c9 7567 8b45e4 50 6a08 }
            // n = 7, score = 600
            //   8b4a04               | mov                 ecx, dword ptr [edx + 4]
            //   c745f800000000       | mov                 dword ptr [ebp - 8], 0
            //   85c9                 | test                ecx, ecx
            //   7567                 | jne                 0x69
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   50                   | push                eax
            //   6a08                 | push                8

        $sequence_1 = { 52 8d45f0 50 8d4df8 51 e8???????? 66d17d08 }
            // n = 7, score = 600
            //   52                   | push                edx
            //   8d45f0               | lea                 eax, dword ptr [ebp - 0x10]
            //   50                   | push                eax
            //   8d4df8               | lea                 ecx, dword ptr [ebp - 8]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   66d17d08             | sar                 word ptr [ebp + 8], 1

        $sequence_2 = { 41 3bc8 72ea 8d45d4 8d7d80 8d75e8 8955d8 }
            // n = 7, score = 600
            //   41                   | inc                 ecx
            //   3bc8                 | cmp                 ecx, eax
            //   72ea                 | jb                  0xffffffec
            //   8d45d4               | lea                 eax, dword ptr [ebp - 0x2c]
            //   8d7d80               | lea                 edi, dword ptr [ebp - 0x80]
            //   8d75e8               | lea                 esi, dword ptr [ebp - 0x18]
            //   8955d8               | mov                 dword ptr [ebp - 0x28], edx

        $sequence_3 = { 33db 394f04 760b 8b07 }
            // n = 4, score = 600
            //   33db                 | xor                 ebx, ebx
            //   394f04               | cmp                 dword ptr [edi + 4], ecx
            //   760b                 | jbe                 0xd
            //   8b07                 | mov                 eax, dword ptr [edi]

        $sequence_4 = { 6603d2 6603d2 6603c2 6603c0 660301 0fb7c0 894508 }
            // n = 7, score = 600
            //   6603d2               | add                 dx, dx
            //   6603d2               | add                 dx, dx
            //   6603c2               | add                 ax, dx
            //   6603c0               | add                 ax, ax
            //   660301               | add                 ax, word ptr [ecx]
            //   0fb7c0               | movzx               eax, ax
            //   894508               | mov                 dword ptr [ebp + 8], eax

        $sequence_5 = { 8d5ddc 8d4dec e8???????? 8b45dc 50 6a00 }
            // n = 6, score = 600
            //   8d5ddc               | lea                 ebx, dword ptr [ebp - 0x24]
            //   8d4dec               | lea                 ecx, dword ptr [ebp - 0x14]
            //   e8????????           |                     
            //   8b45dc               | mov                 eax, dword ptr [ebp - 0x24]
            //   50                   | push                eax
            //   6a00                 | push                0

        $sequence_6 = { 8b4804 83ec10 8bf4 894e04 8b5008 8bca 03c9 }
            // n = 7, score = 600
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]
            //   83ec10               | sub                 esp, 0x10
            //   8bf4                 | mov                 esi, esp
            //   894e04               | mov                 dword ptr [esi + 4], ecx
            //   8b5008               | mov                 edx, dword ptr [eax + 8]
            //   8bca                 | mov                 ecx, edx
            //   03c9                 | add                 ecx, ecx

        $sequence_7 = { 0f842d010000 395dfc 7454 53 53 53 }
            // n = 6, score = 600
            //   0f842d010000         | je                  0x133
            //   395dfc               | cmp                 dword ptr [ebp - 4], ebx
            //   7454                 | je                  0x56
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx

        $sequence_8 = { ff15???????? 8b750c 6a14 6a08 8945d4 }
            // n = 5, score = 600
            //   ff15????????         |                     
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   6a14                 | push                0x14
            //   6a08                 | push                8
            //   8945d4               | mov                 dword ptr [ebp - 0x2c], eax

        $sequence_9 = { 83ec24 53 8b1d???????? 56 57 6840060000 6a08 }
            // n = 7, score = 600
            //   83ec24               | sub                 esp, 0x24
            //   53                   | push                ebx
            //   8b1d????????         |                     
            //   56                   | push                esi
            //   57                   | push                edi
            //   6840060000           | push                0x640
            //   6a08                 | push                8

    condition:
        7 of them and filesize < 106496
}
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