SYMBOLCOMMON_NAMEaka. SYNONYMS
win.flowershop (Back to overview)

FlowerShop


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References
2019-04-09Chronicle SecurityJuan Andrés Guerrero-Saade, Silas Cutler
@techreport{guerrerosaade:20190409:oldest:062ea25, author = {Juan Andrés Guerrero-Saade and Silas Cutler}, title = {{The Oldest Stuxnet Component Dials Up}}, date = {2019-04-09}, institution = {Chronicle Security}, url = {https://storage.googleapis.com/chronicle-research/STUXSHOP%20Stuxnet%20Dials%20In%20.pdf}, language = {English}, urldate = {2019-12-04} } The Oldest Stuxnet Component Dials Up
FlowerShop Stuxnet
2018-03CrySyS LabBoldizsar Bencsath
@techreport{bencsath:201803:territorial:04343bb, author = {Boldizsar Bencsath}, title = {{Territorial Dispute – NSA’s perspective on APT landscape}}, date = {2018-03}, institution = {CrySyS Lab}, url = {https://www.crysys.hu/publications/files/tedi/ukatemicrysys_territorialdispute.pdf}, language = {English}, urldate = {2020-05-07} } Territorial Dispute – NSA’s perspective on APT landscape
9002 RAT Agent.BTZ DuQu EYService Flame FlowerShop Stuxnet Uroburos
Yara Rules
[TLP:WHITE] win_flowershop_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_flowershop_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.flowershop"
        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 = { 48 50 ff7508 ff15???????? 85c0 7504 33c0 }
            // n = 7, score = 500
            //   48                   | dec                 eax
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7504                 | jne                 6
            //   33c0                 | xor                 eax, eax

        $sequence_1 = { a1???????? 668b08 8bd1 2bd7 23d6 81fafd1e0000 }
            // n = 6, score = 500
            //   a1????????           |                     
            //   668b08               | mov                 cx, word ptr [eax]
            //   8bd1                 | mov                 edx, ecx
            //   2bd7                 | sub                 edx, edi
            //   23d6                 | and                 edx, esi
            //   81fafd1e0000         | cmp                 edx, 0x1efd

        $sequence_2 = { 85ff 7419 57 6a00 ff15???????? 50 ff15???????? }
            // n = 7, score = 500
            //   85ff                 | test                edi, edi
            //   7419                 | je                  0x1b
            //   57                   | push                edi
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_3 = { 50 e8???????? 59 83f801 59 7474 }
            // n = 6, score = 500
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   83f801               | cmp                 eax, 1
            //   59                   | pop                 ecx
            //   7474                 | je                  0x76

        $sequence_4 = { 8930 58 ebe9 56 8b742408 }
            // n = 5, score = 500
            //   8930                 | mov                 dword ptr [eax], esi
            //   58                   | pop                 eax
            //   ebe9                 | jmp                 0xffffffeb
            //   56                   | push                esi
            //   8b742408             | mov                 esi, dword ptr [esp + 8]

        $sequence_5 = { e8???????? 8bf0 e8???????? 50 8d45f0 56 50 }
            // n = 7, score = 500
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     
            //   50                   | push                eax
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   56                   | push                esi
            //   50                   | push                eax

        $sequence_6 = { 752b 0fb715???????? 0fb70d???????? 8bc2 8bd9 2bc1 2bda }
            // n = 7, score = 500
            //   752b                 | jne                 0x2d
            //   0fb715????????       |                     
            //   0fb70d????????       |                     
            //   8bc2                 | mov                 eax, edx
            //   8bd9                 | mov                 ebx, ecx
            //   2bc1                 | sub                 eax, ecx
            //   2bda                 | sub                 ebx, edx

        $sequence_7 = { 5e 5b 5d c3 8b442404 832000 83600400 }
            // n = 7, score = 500
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   832000               | and                 dword ptr [eax], 0
            //   83600400             | and                 dword ptr [eax + 4], 0

        $sequence_8 = { 59 8d442454 59 be???????? 50 56 ffd5 }
            // n = 7, score = 500
            //   59                   | pop                 ecx
            //   8d442454             | lea                 eax, [esp + 0x54]
            //   59                   | pop                 ecx
            //   be????????           |                     
            //   50                   | push                eax
            //   56                   | push                esi
            //   ffd5                 | call                ebp

        $sequence_9 = { 47 ffd6 3bd8 59 72ee 5f }
            // n = 6, score = 500
            //   47                   | inc                 edi
            //   ffd6                 | call                esi
            //   3bd8                 | cmp                 ebx, eax
            //   59                   | pop                 ecx
            //   72ee                 | jb                  0xfffffff0
            //   5f                   | pop                 edi

    condition:
        7 of them and filesize < 829440
}
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