SYMBOLCOMMON_NAMEaka. SYNONYMS
win.ransoc (Back to overview)

Ransoc


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References
2016-11-14ProofpointProofpoint Staff
@online{staff:20161114:ransoc:e6b2a9e, author = {Proofpoint Staff}, title = {{Ransoc Desktop Locking Ransomware Ransacks Local Files and Social Media Profiles}}, date = {2016-11-14}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/threat-insight/post/ransoc-desktop-locking-ransomware-ransacks-local-files-social-media-profiles}, language = {English}, urldate = {2019-12-20} } Ransoc Desktop Locking Ransomware Ransacks Local Files and Social Media Profiles
Ransoc
Yara Rules
[TLP:WHITE] win_ransoc_auto (20230125 | Detects win.ransoc.)
rule win_ransoc_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.ransoc."
        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.ransoc"
        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 = { 8d5e34 85c9 7531 8b4638 8b4e3c 85d2 7403 }
            // n = 7, score = 300
            //   8d5e34               | lea                 ebx, [esi + 0x34]
            //   85c9                 | test                ecx, ecx
            //   7531                 | jne                 0x33
            //   8b4638               | mov                 eax, dword ptr [esi + 0x38]
            //   8b4e3c               | mov                 ecx, dword ptr [esi + 0x3c]
            //   85d2                 | test                edx, edx
            //   7403                 | je                  5

        $sequence_1 = { 894a30 894130 e9???????? 894a34 894130 e9???????? 890b }
            // n = 7, score = 300
            //   894a30               | mov                 dword ptr [edx + 0x30], ecx
            //   894130               | mov                 dword ptr [ecx + 0x30], eax
            //   e9????????           |                     
            //   894a34               | mov                 dword ptr [edx + 0x34], ecx
            //   894130               | mov                 dword ptr [ecx + 0x30], eax
            //   e9????????           |                     
            //   890b                 | mov                 dword ptr [ebx], ecx

        $sequence_2 = { 8932 e8???????? 83c404 33c0 }
            // n = 4, score = 300
            //   8932                 | mov                 dword ptr [edx], esi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   33c0                 | xor                 eax, eax

        $sequence_3 = { 56 b101 8d7770 8a06 8ad0 }
            // n = 5, score = 300
            //   56                   | push                esi
            //   b101                 | mov                 cl, 1
            //   8d7770               | lea                 esi, [edi + 0x70]
            //   8a06                 | mov                 al, byte ptr [esi]
            //   8ad0                 | mov                 dl, al

        $sequence_4 = { ffd1 85c0 7551 8b462c a900000400 0f84ab000000 8b54240c }
            // n = 7, score = 300
            //   ffd1                 | call                ecx
            //   85c0                 | test                eax, eax
            //   7551                 | jne                 0x53
            //   8b462c               | mov                 eax, dword ptr [esi + 0x2c]
            //   a900000400           | test                eax, 0x40000
            //   0f84ab000000         | je                  0xb1
            //   8b54240c             | mov                 edx, dword ptr [esp + 0xc]

        $sequence_5 = { ff15???????? f7472c00001000 0f8480000000 8b4e30 51 ff15???????? 5d }
            // n = 7, score = 300
            //   ff15????????         |                     
            //   f7472c00001000       | test                dword ptr [edi + 0x2c], 0x100000
            //   0f8480000000         | je                  0x86
            //   8b4e30               | mov                 ecx, dword ptr [esi + 0x30]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   5d                   | pop                 ebp

        $sequence_6 = { 8b4e2c 751b f6c101 7516 }
            // n = 4, score = 300
            //   8b4e2c               | mov                 ecx, dword ptr [esi + 0x2c]
            //   751b                 | jne                 0x1d
            //   f6c101               | test                cl, 1
            //   7516                 | jne                 0x18

        $sequence_7 = { a1???????? 83f801 7f0d 6a00 68???????? }
            // n = 5, score = 300
            //   a1????????           |                     
            //   83f801               | cmp                 eax, 1
            //   7f0d                 | jg                  0xf
            //   6a00                 | push                0
            //   68????????           |                     

        $sequence_8 = { b843270000 c3 b851270000 c3 b814270000 c3 b846270000 }
            // n = 7, score = 300
            //   b843270000           | mov                 eax, 0x2743
            //   c3                   | ret                 
            //   b851270000           | mov                 eax, 0x2751
            //   c3                   | ret                 
            //   b814270000           | mov                 eax, 0x2714
            //   c3                   | ret                 
            //   b846270000           | mov                 eax, 0x2746

        $sequence_9 = { 89462c a820 7406 8b7604 ff4e04 }
            // n = 5, score = 300
            //   89462c               | mov                 dword ptr [esi + 0x2c], eax
            //   a820                 | test                al, 0x20
            //   7406                 | je                  8
            //   8b7604               | mov                 esi, dword ptr [esi + 4]
            //   ff4e04               | dec                 dword ptr [esi + 4]

    condition:
        7 of them and filesize < 958464
}
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