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://blog.intel471.com/2020/05/21/a-brief-history-of-ta505/}, language = {English}, urldate = {2020-05-23} } 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 (20200529 | autogenerated rule brought to you by yara-signator)
rule win_jaff_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.jaff"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 / approach 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 = { c745d800000000 c745dc0a000000 c645e001 ffd7 50 }
            // n = 5, score = 600
            //   c745d800000000       | mov                 dword ptr [ebp - 0x28], 0
            //   c745dc0a000000       | mov                 dword ptr [ebp - 0x24], 0xa
            //   c645e001             | mov                 byte ptr [ebp - 0x20], 1
            //   ffd7                 | call                edi
            //   50                   | push                eax

        $sequence_1 = { 0fb7d8 8d0c9b 03c9 2bf9 66893c72 46 3b75f8 }
            // n = 7, score = 600
            //   0fb7d8               | movzx               ebx, ax
            //   8d0c9b               | lea                 ecx, [ebx + ebx*4]
            //   03c9                 | add                 ecx, ecx
            //   2bf9                 | sub                 edi, ecx
            //   66893c72             | mov                 word ptr [edx + esi*2], di
            //   46                   | inc                 esi
            //   3b75f8               | cmp                 esi, dword ptr [ebp - 8]

        $sequence_2 = { 5d c3 8b55fc 56 52 6a08 }
            // n = 6, score = 600
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   56                   | push                esi
            //   52                   | push                edx
            //   6a08                 | push                8

        $sequence_3 = { c645f801 ffd7 50 ffd3 8945ec b800010000 }
            // n = 6, score = 600
            //   c645f801             | mov                 byte ptr [ebp - 8], 1
            //   ffd7                 | call                edi
            //   50                   | push                eax
            //   ffd3                 | call                ebx
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   b800010000           | mov                 eax, 0x100

        $sequence_4 = { 894e08 8b5304 03c9 895604 8a430c 51 }
            // n = 6, score = 600
            //   894e08               | mov                 dword ptr [esi + 8], ecx
            //   8b5304               | mov                 edx, dword ptr [ebx + 4]
            //   03c9                 | add                 ecx, ecx
            //   895604               | mov                 dword ptr [esi + 4], edx
            //   8a430c               | mov                 al, byte ptr [ebx + 0xc]
            //   51                   | push                ecx

        $sequence_5 = { 56 57 8b7d08 8b4708 3bc1 }
            // n = 5, score = 600
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   8b4708               | mov                 eax, dword ptr [edi + 8]
            //   3bc1                 | cmp                 eax, ecx

        $sequence_6 = { 8b08 8d55fc 52 50 8b4158 ffd0 }
            // n = 6, score = 600
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   8d55fc               | lea                 edx, [ebp - 4]
            //   52                   | push                edx
            //   50                   | push                eax
            //   8b4158               | mov                 eax, dword ptr [ecx + 0x58]
            //   ffd0                 | call                eax

        $sequence_7 = { 72e7 8b750c 8b55ec 8b45f0 }
            // n = 4, score = 600
            //   72e7                 | jb                  0xffffffe9
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]

        $sequence_8 = { 90 668b340a 668931 83c102 ff4df8 75f1 50 }
            // n = 7, score = 600
            //   90                   | nop                 
            //   668b340a             | mov                 si, word ptr [edx + ecx]
            //   668931               | mov                 word ptr [ecx], si
            //   83c102               | add                 ecx, 2
            //   ff4df8               | dec                 dword ptr [ebp - 8]
            //   75f1                 | jne                 0xfffffff3
            //   50                   | push                eax

        $sequence_9 = { ffd3 50 ff15???????? 8b4d10 33c0 }
            // n = 5, score = 600
            //   ffd3                 | call                ebx
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   33c0                 | xor                 eax, eax

    condition:
        7 of them and filesize < 106496
}
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