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 (20220808 | Detects win.jaff.)
rule win_jaff_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        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 = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 8b45fc 2bd0 034508 8d4d0c 51 4a 50 }
            // n = 7, score = 600
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   2bd0                 | sub                 edx, eax
            //   034508               | add                 eax, dword ptr [ebp + 8]
            //   8d4d0c               | lea                 ecx, [ebp + 0xc]
            //   51                   | push                ecx
            //   4a                   | dec                 edx
            //   50                   | push                eax

        $sequence_1 = { 8d4db4 0f94c0 51 8d5580 8845c0 }
            // n = 5, score = 600
            //   8d4db4               | lea                 ecx, [ebp - 0x4c]
            //   0f94c0               | sete                al
            //   51                   | push                ecx
            //   8d5580               | lea                 edx, [ebp - 0x80]
            //   8845c0               | mov                 byte ptr [ebp - 0x40], al

        $sequence_2 = { 8d75cc e8???????? 8b55ac 52 6a00 }
            // n = 5, score = 600
            //   8d75cc               | lea                 esi, [ebp - 0x34]
            //   e8????????           |                     
            //   8b55ac               | mov                 edx, dword ptr [ebp - 0x54]
            //   52                   | push                edx
            //   6a00                 | push                0

        $sequence_3 = { 397704 7608 8b0f 0fb70c71 }
            // n = 4, score = 600
            //   397704               | cmp                 dword ptr [edi + 4], esi
            //   7608                 | jbe                 0xa
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   0fb70c71             | movzx               ecx, word ptr [ecx + esi*2]

        $sequence_4 = { 84c0 750c 807b0c00 7406 b001 5d }
            // n = 6, score = 600
            //   84c0                 | test                al, al
            //   750c                 | jne                 0xe
            //   807b0c00             | cmp                 byte ptr [ebx + 0xc], 0
            //   7406                 | je                  8
            //   b001                 | mov                 al, 1
            //   5d                   | pop                 ebp

        $sequence_5 = { e8???????? 8b45a8 50 6a00 ffd3 50 }
            // n = 6, score = 600
            //   e8????????           |                     
            //   8b45a8               | mov                 eax, dword ptr [ebp - 0x58]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   ffd3                 | call                ebx
            //   50                   | push                eax

        $sequence_6 = { 8bec 81ec94000000 53 8b1d???????? }
            // n = 4, score = 600
            //   8bec                 | mov                 ebp, esp
            //   81ec94000000         | sub                 esp, 0x94
            //   53                   | push                ebx
            //   8b1d????????         |                     

        $sequence_7 = { 6a08 c745d800000000 c745dc0a000000 c645e001 ffd3 50 ff15???????? }
            // n = 7, score = 600
            //   6a08                 | push                8
            //   c745d800000000       | mov                 dword ptr [ebp - 0x28], 0
            //   c745dc0a000000       | mov                 dword ptr [ebp - 0x24], 0xa
            //   c645e001             | mov                 byte ptr [ebp - 0x20], 1
            //   ffd3                 | call                ebx
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_8 = { 8d4de4 e8???????? 8b4dd4 51 }
            // n = 4, score = 600
            //   8d4de4               | lea                 ecx, [ebp - 0x1c]
            //   e8????????           |                     
            //   8b4dd4               | mov                 ecx, dword ptr [ebp - 0x2c]
            //   51                   | push                ecx

        $sequence_9 = { ff15???????? 50 ff15???????? 8b4b08 894e08 8b5304 }
            // n = 6, score = 600
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b4b08               | mov                 ecx, dword ptr [ebx + 8]
            //   894e08               | mov                 dword ptr [esi + 8], ecx
            //   8b5304               | mov                 edx, dword ptr [ebx + 4]

    condition:
        7 of them and filesize < 106496
}
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