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 (20201014 | autogenerated rule brought to you by yara-signator)
rule win_jaff_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.jaff"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 52 6a00 ffd7 50 ffd6 53 6a00 }
            // n = 7, score = 600
            //   52                   | push                edx
            //   6a00                 | push                0
            //   ffd7                 | call                edi
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   53                   | push                ebx
            //   6a00                 | push                0

        $sequence_1 = { eb06 807d0b00 7511 50 8d45f4 50 8d4dec }
            // n = 7, score = 600
            //   eb06                 | jmp                 8
            //   807d0b00             | cmp                 byte ptr [ebp + 0xb], 0
            //   7511                 | jne                 0x13
            //   50                   | push                eax
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   50                   | push                eax
            //   8d4dec               | lea                 ecx, [ebp - 0x14]

        $sequence_2 = { 8bc1 8945e4 03c0 50 33f6 6a08 8975e0 }
            // n = 7, score = 600
            //   8bc1                 | mov                 eax, ecx
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   03c0                 | add                 eax, eax
            //   50                   | push                eax
            //   33f6                 | xor                 esi, esi
            //   6a08                 | push                8
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi

        $sequence_3 = { 8b55c4 668b1442 8b0e 66891441 40 3b4608 72ed }
            // n = 7, score = 600
            //   8b55c4               | mov                 edx, dword ptr [ebp - 0x3c]
            //   668b1442             | mov                 dx, word ptr [edx + eax*2]
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   66891441             | mov                 word ptr [ecx + eax*2], dx
            //   40                   | inc                 eax
            //   3b4608               | cmp                 eax, dword ptr [esi + 8]
            //   72ed                 | jb                  0xffffffef

        $sequence_4 = { 47 83c40c 4e 83ff29 7cd6 017df8 395df4 }
            // n = 7, score = 600
            //   47                   | inc                 edi
            //   83c40c               | add                 esp, 0xc
            //   4e                   | dec                 esi
            //   83ff29               | cmp                 edi, 0x29
            //   7cd6                 | jl                  0xffffffd8
            //   017df8               | add                 dword ptr [ebp - 8], edi
            //   395df4               | cmp                 dword ptr [ebp - 0xc], ebx

        $sequence_5 = { 668b1441 66891443 40 3bc6 72f1 807dc000 8d4db4 }
            // n = 7, score = 600
            //   668b1441             | mov                 dx, word ptr [ecx + eax*2]
            //   66891443             | mov                 word ptr [ebx + eax*2], dx
            //   40                   | inc                 eax
            //   3bc6                 | cmp                 eax, esi
            //   72f1                 | jb                  0xfffffff3
            //   807dc000             | cmp                 byte ptr [ebp - 0x40], 0
            //   8d4db4               | lea                 ecx, [ebp - 0x4c]

        $sequence_6 = { ff15???????? 8b550c 837a0400 c745f800000000 0f86d1010000 }
            // n = 5, score = 600
            //   ff15????????         |                     
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   837a0400             | cmp                 dword ptr [edx + 4], 0
            //   c745f800000000       | mov                 dword ptr [ebp - 8], 0
            //   0f86d1010000         | jbe                 0x1d7

        $sequence_7 = { ff15???????? 50 ff15???????? 33c9 394e04 7610 8b16 }
            // n = 7, score = 600
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   33c9                 | xor                 ecx, ecx
            //   394e04               | cmp                 dword ptr [esi + 4], ecx
            //   7610                 | jbe                 0x12
            //   8b16                 | mov                 edx, dword ptr [esi]

        $sequence_8 = { 8b55f8 52 6a00 ffd3 }
            // n = 4, score = 600
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   52                   | push                edx
            //   6a00                 | push                0
            //   ffd3                 | call                ebx

        $sequence_9 = { c645d001 8945e4 ffd3 50 }
            // n = 4, score = 600
            //   c645d001             | mov                 byte ptr [ebp - 0x30], 1
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   ffd3                 | call                ebx
            //   50                   | push                eax

    condition:
        7 of them and filesize < 106496
}
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