SYMBOLCOMMON_NAMEaka. SYNONYMS
win.jaff (Back to overview)

Jaff


There is no description at this point.

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 (20230125 | Detects win.jaff.)
rule win_jaff_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { ff15???????? 8906 33c0 394608 7619 8d9b00000000 8b55dc }
            // n = 7, score = 600
            //   ff15????????         |                     
            //   8906                 | mov                 dword ptr [esi], eax
            //   33c0                 | xor                 eax, eax
            //   394608               | cmp                 dword ptr [esi + 8], eax
            //   7619                 | jbe                 0x1b
            //   8d9b00000000         | lea                 ebx, [ebx]
            //   8b55dc               | mov                 edx, dword ptr [ebp - 0x24]

        $sequence_1 = { 3b7a04 72e8 897dec 8945fc }
            // n = 4, score = 600
            //   3b7a04               | cmp                 edi, dword ptr [edx + 4]
            //   72e8                 | jb                  0xffffffea
            //   897dec               | mov                 dword ptr [ebp - 0x14], edi
            //   8945fc               | mov                 dword ptr [ebp - 4], eax

        $sequence_2 = { 8b4d08 80790c00 740d 8b5510 807a0c00 7504 c645e800 }
            // n = 7, score = 600
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   80790c00             | cmp                 byte ptr [ecx + 0xc], 0
            //   740d                 | je                  0xf
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]
            //   807a0c00             | cmp                 byte ptr [edx + 0xc], 0
            //   7504                 | jne                 6
            //   c645e800             | mov                 byte ptr [ebp - 0x18], 0

        $sequence_3 = { 8b45dc 66891448 41 3b4df8 76a8 }
            // n = 5, score = 600
            //   8b45dc               | mov                 eax, dword ptr [ebp - 0x24]
            //   66891448             | mov                 word ptr [eax + ecx*2], dx
            //   41                   | inc                 ecx
            //   3b4df8               | cmp                 ecx, dword ptr [ebp - 8]
            //   76a8                 | jbe                 0xffffffaa

        $sequence_4 = { 8b5708 8b1e 668b1c4b 66891c48 41 3bca 72f1 }
            // n = 7, score = 600
            //   8b5708               | mov                 edx, dword ptr [edi + 8]
            //   8b1e                 | mov                 ebx, dword ptr [esi]
            //   668b1c4b             | mov                 bx, word ptr [ebx + ecx*2]
            //   66891c48             | mov                 word ptr [eax + ecx*2], bx
            //   41                   | inc                 ecx
            //   3bca                 | cmp                 ecx, edx
            //   72f1                 | jb                  0xfffffff3

        $sequence_5 = { 56 57 8b3d???????? 6a14 6a08 c745ec0a000000 }
            // n = 6, score = 600
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b3d????????         |                     
            //   6a14                 | push                0x14
            //   6a08                 | push                8
            //   c745ec0a000000       | mov                 dword ptr [ebp - 0x14], 0xa

        $sequence_6 = { 5e 33c0 5b 8be5 5d c20800 8bd1 }
            // n = 7, score = 600
            //   5e                   | pop                 esi
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   8bd1                 | mov                 edx, ecx

        $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 = { 8b4ddc 8b3d???????? 51 6a00 ffd7 50 ffd3 }
            // n = 7, score = 600
            //   8b4ddc               | mov                 ecx, dword ptr [ebp - 0x24]
            //   8b3d????????         |                     
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   ffd7                 | call                edi
            //   50                   | push                eax
            //   ffd3                 | call                ebx

        $sequence_9 = { 57 8bf0 6a14 6a08 c7460400000000 c746080a000000 c6460c01 }
            // n = 7, score = 600
            //   57                   | push                edi
            //   8bf0                 | mov                 esi, eax
            //   6a14                 | push                0x14
            //   6a08                 | push                8
            //   c7460400000000       | mov                 dword ptr [esi + 4], 0
            //   c746080a000000       | mov                 dword ptr [esi + 8], 0xa
            //   c6460c01             | mov                 byte ptr [esi + 0xc], 1

    condition:
        7 of them and filesize < 106496
}
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