SYMBOLCOMMON_NAMEaka. SYNONYMS
win.sparrow_door (Back to overview)

SparrowDoor

aka: FamousSparrow

There is no description at this point.

References
2022-02-28NCSC UKNCSC UK
@techreport{uk:20220228:malware:0cbf8c2, author = {NCSC UK}, title = {{Malware Analysis Report: SparrowDoor}}, date = {2022-02-28}, institution = {NCSC UK}, url = {https://www.ncsc.gov.uk/files/NCSC-MAR-SparrowDoor.pdf}, language = {English}, urldate = {2022-05-17} } Malware Analysis Report: SparrowDoor
SparrowDoor
2021-09-23ESET ResearchTahseen Bin Taj, Matthieu Faou
@online{taj:20210923:famoussparrow:5f0d606, author = {Tahseen Bin Taj and Matthieu Faou}, title = {{FamousSparrow: A suspicious hotel guest}}, date = {2021-09-23}, organization = {ESET Research}, url = {https://www.welivesecurity.com/2021/09/23/famoussparrow-suspicious-hotel-guest/}, language = {English}, urldate = {2021-09-24} } FamousSparrow: A suspicious hotel guest
SparrowDoor
Yara Rules
[TLP:WHITE] win_sparrow_door_auto (20220808 | Detects win.sparrow_door.)
rule win_sparrow_door_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.sparrow_door."
        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.sparrow_door"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { e8???????? 83c40c 68e8030000 8d8c244c070000 }
            // n = 4, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   68e8030000           | push                0x3e8
            //   8d8c244c070000       | lea                 ecx, [esp + 0x74c]

        $sequence_1 = { 83c710 8d5610 57 52 892e 894608 894e0c }
            // n = 7, score = 100
            //   83c710               | add                 edi, 0x10
            //   8d5610               | lea                 edx, [esi + 0x10]
            //   57                   | push                edi
            //   52                   | push                edx
            //   892e                 | mov                 dword ptr [esi], ebp
            //   894608               | mov                 dword ptr [esi + 8], eax
            //   894e0c               | mov                 dword ptr [esi + 0xc], ecx

        $sequence_2 = { 56 57 33db 6a3f 8d442415 53 50 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   33db                 | xor                 ebx, ebx
            //   6a3f                 | push                0x3f
            //   8d442415             | lea                 eax, [esp + 0x15]
            //   53                   | push                ebx
            //   50                   | push                eax

        $sequence_3 = { 8a4c0c14 300c30 40 3bc7 7cef b913000000 8dbc2498000000 }
            // n = 7, score = 100
            //   8a4c0c14             | mov                 cl, byte ptr [esp + ecx + 0x14]
            //   300c30               | xor                 byte ptr [eax + esi], cl
            //   40                   | inc                 eax
            //   3bc7                 | cmp                 eax, edi
            //   7cef                 | jl                  0xfffffff1
            //   b913000000           | mov                 ecx, 0x13
            //   8dbc2498000000       | lea                 edi, [esp + 0x98]

        $sequence_4 = { e9???????? 83ff01 7517 803e24 0f85df000000 8d5c2440 }
            // n = 6, score = 100
            //   e9????????           |                     
            //   83ff01               | cmp                 edi, 1
            //   7517                 | jne                 0x19
            //   803e24               | cmp                 byte ptr [esi], 0x24
            //   0f85df000000         | jne                 0xe5
            //   8d5c2440             | lea                 ebx, [esp + 0x40]

        $sequence_5 = { 57 56 6a00 68e9fd0000 ff15???????? 6a00 }
            // n = 6, score = 100
            //   57                   | push                edi
            //   56                   | push                esi
            //   6a00                 | push                0
            //   68e9fd0000           | push                0xfde9
            //   ff15????????         |                     
            //   6a00                 | push                0

        $sequence_6 = { 8a842418010000 8dbc2418010000 84c0 7434 }
            // n = 4, score = 100
            //   8a842418010000       | mov                 al, byte ptr [esp + 0x118]
            //   8dbc2418010000       | lea                 edi, [esp + 0x118]
            //   84c0                 | test                al, al
            //   7434                 | je                  0x36

        $sequence_7 = { 751e 8d04f5c0e12a00 8938 68a00f0000 ff30 83c718 e8???????? }
            // n = 7, score = 100
            //   751e                 | jne                 0x20
            //   8d04f5c0e12a00       | lea                 eax, [esi*8 + 0x2ae1c0]
            //   8938                 | mov                 dword ptr [eax], edi
            //   68a00f0000           | push                0xfa0
            //   ff30                 | push                dword ptr [eax]
            //   83c718               | add                 edi, 0x18
            //   e8????????           |                     

        $sequence_8 = { 50 c644241000 e8???????? 56 8d4c2414 68???????? }
            // n = 6, score = 100
            //   50                   | push                eax
            //   c644241000           | mov                 byte ptr [esp + 0x10], 0
            //   e8????????           |                     
            //   56                   | push                esi
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   68????????           |                     

        $sequence_9 = { 52 8d842428020000 50 8d4c2424 68???????? 51 }
            // n = 6, score = 100
            //   52                   | push                edx
            //   8d842428020000       | lea                 eax, [esp + 0x228]
            //   50                   | push                eax
            //   8d4c2424             | lea                 ecx, [esp + 0x24]
            //   68????????           |                     
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 155648
}
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