SYMBOLCOMMON_NAMEaka. SYNONYMS
win.jolob (Back to overview)

Jolob


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References
2014-10-27PWCChris Doman, Tom Lancaster
@online{doman:20141027:scanbox:c4beb38, author = {Chris Doman and Tom Lancaster}, title = {{ScanBox framework – who’s affected, and who’s using it?}}, date = {2014-10-27}, organization = {PWC}, url = {http://pwc.blogs.com/cyber_security_updates/2014/10/scanbox-framework-whos-affected-and-whos-using-it-1.html}, language = {English}, urldate = {2020-01-07} } ScanBox framework – who’s affected, and who’s using it?
Jolob
Yara Rules
[TLP:WHITE] win_jolob_auto (20220516 | Detects win.jolob.)
rule win_jolob_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.jolob."
        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.jolob"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 8b5f0c 8d75ec 897df8 e8???????? 8b7df8 8b5f10 }
            // n = 6, score = 300
            //   8b5f0c               | mov                 ebx, dword ptr [edi + 0xc]
            //   8d75ec               | lea                 esi, [ebp - 0x14]
            //   897df8               | mov                 dword ptr [ebp - 8], edi
            //   e8????????           |                     
            //   8b7df8               | mov                 edi, dword ptr [ebp - 8]
            //   8b5f10               | mov                 ebx, dword ptr [edi + 0x10]

        $sequence_1 = { ebc1 51 51 53 33c0 55 }
            // n = 6, score = 300
            //   ebc1                 | jmp                 0xffffffc3
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   33c0                 | xor                 eax, eax
            //   55                   | push                ebp

        $sequence_2 = { c68405fcfbffff00 75f5 ff7514 ff7510 ff7518 ff7510 e8???????? }
            // n = 7, score = 300
            //   c68405fcfbffff00     | mov                 byte ptr [ebp + eax - 0x404], 0
            //   75f5                 | jne                 0xfffffff7
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff7518               | push                dword ptr [ebp + 0x18]
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   e8????????           |                     

        $sequence_3 = { 56 57 ff750c 8bf3 ff7508 e8???????? }
            // n = 6, score = 300
            //   56                   | push                esi
            //   57                   | push                edi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   8bf3                 | mov                 esi, ebx
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     

        $sequence_4 = { 50 8b4604 6aff ffb004080000 ff15???????? 33c0 eb03 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   6aff                 | push                -1
            //   ffb004080000         | push                dword ptr [eax + 0x804]
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   eb03                 | jmp                 5

        $sequence_5 = { 7707 8bf3 e8???????? 8b4318 03431c }
            // n = 5, score = 300
            //   7707                 | ja                  9
            //   8bf3                 | mov                 esi, ebx
            //   e8????????           |                     
            //   8b4318               | mov                 eax, dword ptr [ebx + 0x18]
            //   03431c               | add                 eax, dword ptr [ebx + 0x1c]

        $sequence_6 = { 57 50 8945f4 ff15???????? 8d7e04 }
            // n = 5, score = 300
            //   57                   | push                edi
            //   50                   | push                eax
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   ff15????????         |                     
            //   8d7e04               | lea                 edi, [esi + 4]

        $sequence_7 = { 59 3bc3 740c 8d4808 894904 8909 8bf0 }
            // n = 7, score = 300
            //   59                   | pop                 ecx
            //   3bc3                 | cmp                 eax, ebx
            //   740c                 | je                  0xe
            //   8d4808               | lea                 ecx, [eax + 8]
            //   894904               | mov                 dword ptr [ecx + 4], ecx
            //   8909                 | mov                 dword ptr [ecx], ecx
            //   8bf0                 | mov                 esi, eax

        $sequence_8 = { 85c0 7416 8b490c 89480c eb0e 8b4908 }
            // n = 6, score = 300
            //   85c0                 | test                eax, eax
            //   7416                 | je                  0x18
            //   8b490c               | mov                 ecx, dword ptr [ecx + 0xc]
            //   89480c               | mov                 dword ptr [eax + 0xc], ecx
            //   eb0e                 | jmp                 0x10
            //   8b4908               | mov                 ecx, dword ptr [ecx + 8]

        $sequence_9 = { e8???????? eb16 395c2410 7504 53 53 eb19 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   eb16                 | jmp                 0x18
            //   395c2410             | cmp                 dword ptr [esp + 0x10], ebx
            //   7504                 | jne                 6
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   eb19                 | jmp                 0x1b

    condition:
        7 of them and filesize < 196608
}
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