SYMBOLCOMMON_NAMEaka. SYNONYMS
win.flashflood (Back to overview)

FLASHFLOOD

Actor(s): APT 30


FLASHFLOOD will scan inserted removable drives for targeted files, and copy those files from the
removable drive to the FLASHFLOOD-infected system. FLASHFLOOD may also log or copy additional data from the victim computer, such as system information
or contacts.

References
2015-04FireEyeFireEye
@techreport{fireeye:201504:apt30:0129bf7, author = {FireEye}, title = {{APT30 AND THE MECHANICS OF A LONG-RUNNING CYBER ESPIONAGE OPERATION}}, date = {2015-04}, institution = {FireEye}, url = {https://www2.fireeye.com/rs/fireye/images/rpt-apt30.pdf}, language = {English}, urldate = {2020-01-07} } APT30 AND THE MECHANICS OF A LONG-RUNNING CYBER ESPIONAGE OPERATION
BACKBEND backspace CREAMSICLE FLASHFLOOD GEMCUTTER MILKMAID Naikon NETEAGLE ORANGEADE SHIPSHAPE SPACESHIP SslMM Sys10 WinMM xsPlus APT 30
Yara Rules
[TLP:WHITE] win_flashflood_auto (20220411 | Detects win.flashflood.)
rule win_flashflood_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.flashflood."
        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.flashflood"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 6800000002 6a03 57 6a05 8d85f4fbffff 6800000080 }
            // n = 6, score = 100
            //   6800000002           | push                0x2000000
            //   6a03                 | push                3
            //   57                   | push                edi
            //   6a05                 | push                5
            //   8d85f4fbffff         | lea                 eax, dword ptr [ebp - 0x40c]
            //   6800000080           | push                0x80000000

        $sequence_1 = { ff75fc ff15???????? eb45 57 8d45f4 }
            // n = 5, score = 100
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff15????????         |                     
            //   eb45                 | jmp                 0x47
            //   57                   | push                edi
            //   8d45f4               | lea                 eax, dword ptr [ebp - 0xc]

        $sequence_2 = { 33c9 668b88ec914000 8b5508 898a88000000 8b4508 8b487c }
            // n = 6, score = 100
            //   33c9                 | xor                 ecx, ecx
            //   668b88ec914000       | mov                 cx, word ptr [eax + 0x4091ec]
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   898a88000000         | mov                 dword ptr [edx + 0x88], ecx
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b487c               | mov                 ecx, dword ptr [eax + 0x7c]

        $sequence_3 = { 68???????? e8???????? 6a09 5e 56 68???????? }
            // n = 6, score = 100
            //   68????????           |                     
            //   e8????????           |                     
            //   6a09                 | push                9
            //   5e                   | pop                 esi
            //   56                   | push                esi
            //   68????????           |                     

        $sequence_4 = { 8bec 81ec10070000 53 56 be???????? 57 }
            // n = 6, score = 100
            //   8bec                 | mov                 ebp, esp
            //   81ec10070000         | sub                 esp, 0x710
            //   53                   | push                ebx
            //   56                   | push                esi
            //   be????????           |                     
            //   57                   | push                edi

        $sequence_5 = { 7c45 83c62c 6a2e 56 ff15???????? 8b3d???????? 59 }
            // n = 7, score = 100
            //   7c45                 | jl                  0x47
            //   83c62c               | add                 esi, 0x2c
            //   6a2e                 | push                0x2e
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8b3d????????         |                     
            //   59                   | pop                 ecx

        $sequence_6 = { 7cf1 c3 56 33f6 3974240c 7e1d }
            // n = 6, score = 100
            //   7cf1                 | jl                  0xfffffff3
            //   c3                   | ret                 
            //   56                   | push                esi
            //   33f6                 | xor                 esi, esi
            //   3974240c             | cmp                 dword ptr [esp + 0xc], esi
            //   7e1d                 | jle                 0x1f

        $sequence_7 = { 897dfc e8???????? 8b4df4 6a01 58 5f 5e }
            // n = 7, score = 100
            //   897dfc               | mov                 dword ptr [ebp - 4], edi
            //   e8????????           |                     
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   6a01                 | push                1
            //   58                   | pop                 eax
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_8 = { c9 c3 56 68???????? ff74240c ff15???????? 8bf0 }
            // n = 7, score = 100
            //   c9                   | leave               
            //   c3                   | ret                 
            //   56                   | push                esi
            //   68????????           |                     
            //   ff74240c             | push                dword ptr [esp + 0xc]
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_9 = { 817df480841e00 736b 0fb745f0 50 }
            // n = 4, score = 100
            //   817df480841e00       | cmp                 dword ptr [ebp - 0xc], 0x1e8480
            //   736b                 | jae                 0x6d
            //   0fb745f0             | movzx               eax, word ptr [ebp - 0x10]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 114688
}
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