SYMBOLCOMMON_NAMEaka. SYNONYMS
win.flying_dutchman (Back to overview)

FlyingDutchman

Actor(s): Calypso group


There is no description at this point.

References
2019-10-31PTSecurityPTSecurity
@online{ptsecurity:20191031:calypso:adaf761, author = {PTSecurity}, title = {{Calypso APT: new group attacking state institutions}}, date = {2019-10-31}, organization = {PTSecurity}, url = {https://www.ptsecurity.com/ww-en/analytics/calypso-apt-2019/}, language = {English}, urldate = {2020-01-12} } Calypso APT: new group attacking state institutions
BYEBY FlyingDutchman Hussar PlugX
Yara Rules
[TLP:WHITE] win_flying_dutchman_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_flying_dutchman_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.flying_dutchman"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 85c0 7434 33c0 eb03 }
            // n = 4, score = 100
            //   85c0                 | test                eax, eax
            //   7434                 | je                  0x36
            //   33c0                 | xor                 eax, eax
            //   eb03                 | jmp                 5

        $sequence_1 = { ffb564deffff ff15???????? 85c0 7459 8b8568deffff 3bc3 744f }
            // n = 7, score = 100
            //   ffb564deffff         | push                dword ptr [ebp - 0x219c]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7459                 | je                  0x5b
            //   8b8568deffff         | mov                 eax, dword ptr [ebp - 0x2198]
            //   3bc3                 | cmp                 eax, ebx
            //   744f                 | je                  0x51

        $sequence_2 = { 898558f9ffff 8d8510f7ffff 50 b84c020000 8bf7 e8???????? 8b4708 }
            // n = 7, score = 100
            //   898558f9ffff         | mov                 dword ptr [ebp - 0x6a8], eax
            //   8d8510f7ffff         | lea                 eax, [ebp - 0x8f0]
            //   50                   | push                eax
            //   b84c020000           | mov                 eax, 0x24c
            //   8bf7                 | mov                 esi, edi
            //   e8????????           |                     
            //   8b4708               | mov                 eax, dword ptr [edi + 8]

        $sequence_3 = { 8d44240c 53 50 e8???????? 83c40c ff7608 8d44240c }
            // n = 7, score = 100
            //   8d44240c             | lea                 eax, [esp + 0xc]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   ff7608               | push                dword ptr [esi + 8]
            //   8d44240c             | lea                 eax, [esp + 0xc]

        $sequence_4 = { 6a01 6a00 6a03 68000000c0 8d85f4fdffff 50 ff15???????? }
            // n = 7, score = 100
            //   6a01                 | push                1
            //   6a00                 | push                0
            //   6a03                 | push                3
            //   68000000c0           | push                0xc0000000
            //   8d85f4fdffff         | lea                 eax, [ebp - 0x20c]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_5 = { 89b57ce2ffff 898560deffff bf581b0000 57 }
            // n = 4, score = 100
            //   89b57ce2ffff         | mov                 dword ptr [ebp - 0x1d84], esi
            //   898560deffff         | mov                 dword ptr [ebp - 0x21a0], eax
            //   bf581b0000           | mov                 edi, 0x1b58
            //   57                   | push                edi

        $sequence_6 = { 69c0e8030000 2d33a00000 0f8497000000 48 0f8489000000 48 }
            // n = 6, score = 100
            //   69c0e8030000         | imul                eax, eax, 0x3e8
            //   2d33a00000           | sub                 eax, 0xa033
            //   0f8497000000         | je                  0x9d
            //   48                   | dec                 eax
            //   0f8489000000         | je                  0x8f
            //   48                   | dec                 eax

        $sequence_7 = { 89580c 895810 895814 8bf0 eb02 33f6 8b450c }
            // n = 7, score = 100
            //   89580c               | mov                 dword ptr [eax + 0xc], ebx
            //   895810               | mov                 dword ptr [eax + 0x10], ebx
            //   895814               | mov                 dword ptr [eax + 0x14], ebx
            //   8bf0                 | mov                 esi, eax
            //   eb02                 | jmp                 4
            //   33f6                 | xor                 esi, esi
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

        $sequence_8 = { 33f6 89852cffffff 395d08 0f8699000000 8d4702 898530ffffff }
            // n = 6, score = 100
            //   33f6                 | xor                 esi, esi
            //   89852cffffff         | mov                 dword ptr [ebp - 0xd4], eax
            //   395d08               | cmp                 dword ptr [ebp + 8], ebx
            //   0f8699000000         | jbe                 0x9f
            //   8d4702               | lea                 eax, [edi + 2]
            //   898530ffffff         | mov                 dword ptr [ebp - 0xd0], eax

        $sequence_9 = { 72f5 83ff07 7204 8bf7 eb02 33f6 6685f6 }
            // n = 7, score = 100
            //   72f5                 | jb                  0xfffffff7
            //   83ff07               | cmp                 edi, 7
            //   7204                 | jb                  6
            //   8bf7                 | mov                 esi, edi
            //   eb02                 | jmp                 4
            //   33f6                 | xor                 esi, esi
            //   6685f6               | test                si, si

    condition:
        7 of them and filesize < 276480
}
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