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 (20230125 | Detects win.flying_dutchman.)
rule win_flying_dutchman_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.flying_dutchman."
        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.flying_dutchman"
        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 = { ff7508 e8???????? 8bf8 8d4708 50 894608 e8???????? }
            // n = 7, score = 100
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   8d4708               | lea                 eax, [edi + 8]
            //   50                   | push                eax
            //   894608               | mov                 dword ptr [esi + 8], eax
            //   e8????????           |                     

        $sequence_1 = { 53 898584e2ffff 8d8568deffff 50 }
            // n = 4, score = 100
            //   53                   | push                ebx
            //   898584e2ffff         | mov                 dword ptr [ebp - 0x1d7c], eax
            //   8d8568deffff         | lea                 eax, [ebp - 0x2198]
            //   50                   | push                eax

        $sequence_2 = { 50 8d85ecfeffff 68???????? 50 c645fc06 e8???????? }
            // n = 6, score = 100
            //   50                   | push                eax
            //   8d85ecfeffff         | lea                 eax, [ebp - 0x114]
            //   68????????           |                     
            //   50                   | push                eax
            //   c645fc06             | mov                 byte ptr [ebp - 4], 6
            //   e8????????           |                     

        $sequence_3 = { 03d8 899decbfffff 3b9df0bfffff 72c5 57 8d9ee8000000 6a00 }
            // n = 7, score = 100
            //   03d8                 | add                 ebx, eax
            //   899decbfffff         | mov                 dword ptr [ebp - 0x4014], ebx
            //   3b9df0bfffff         | cmp                 ebx, dword ptr [ebp - 0x4010]
            //   72c5                 | jb                  0xffffffc7
            //   57                   | push                edi
            //   8d9ee8000000         | lea                 ebx, [esi + 0xe8]
            //   6a00                 | push                0

        $sequence_4 = { 50 e8???????? 8945ec 8b45d8 2b45d4 bb48060000 59 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   8b45d8               | mov                 eax, dword ptr [ebp - 0x28]
            //   2b45d4               | sub                 eax, dword ptr [ebp - 0x2c]
            //   bb48060000           | mov                 ebx, 0x648
            //   59                   | pop                 ecx

        $sequence_5 = { 83c40c 89bd50ffffff 89bd54ffffff 89bd60ffffff 89bd64ffffff }
            // n = 5, score = 100
            //   83c40c               | add                 esp, 0xc
            //   89bd50ffffff         | mov                 dword ptr [ebp - 0xb0], edi
            //   89bd54ffffff         | mov                 dword ptr [ebp - 0xac], edi
            //   89bd60ffffff         | mov                 dword ptr [ebp - 0xa0], edi
            //   89bd64ffffff         | mov                 dword ptr [ebp - 0x9c], edi

        $sequence_6 = { 6685c9 75f1 e9???????? b8???????? 2bd0 0fb708 66890c02 }
            // n = 7, score = 100
            //   6685c9               | test                cx, cx
            //   75f1                 | jne                 0xfffffff3
            //   e9????????           |                     
            //   b8????????           |                     
            //   2bd0                 | sub                 edx, eax
            //   0fb708               | movzx               ecx, word ptr [eax]
            //   66890c02             | mov                 word ptr [edx + eax], cx

        $sequence_7 = { b984000000 f3a5 8b45d8 2b45d4 8bcb }
            // n = 5, score = 100
            //   b984000000           | mov                 ecx, 0x84
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8b45d8               | mov                 eax, dword ptr [ebp - 0x28]
            //   2b45d4               | sub                 eax, dword ptr [ebp - 0x2c]
            //   8bcb                 | mov                 ecx, ebx

        $sequence_8 = { 56 8b7508 57 bbc8000000 53 6a00 bf???????? }
            // n = 7, score = 100
            //   56                   | push                esi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   57                   | push                edi
            //   bbc8000000           | mov                 ebx, 0xc8
            //   53                   | push                ebx
            //   6a00                 | push                0
            //   bf????????           |                     

        $sequence_9 = { 0fb6c0 c1e804 83e001 898558f9ffff 8d8510f7ffff 50 b84c020000 }
            // n = 7, score = 100
            //   0fb6c0               | movzx               eax, al
            //   c1e804               | shr                 eax, 4
            //   83e001               | and                 eax, 1
            //   898558f9ffff         | mov                 dword ptr [ebp - 0x6a8], eax
            //   8d8510f7ffff         | lea                 eax, [ebp - 0x8f0]
            //   50                   | push                eax
            //   b84c020000           | mov                 eax, 0x24c

    condition:
        7 of them and filesize < 276480
}
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