SYMBOLCOMMON_NAMEaka. SYNONYMS
win.iisniff (Back to overview)

IISniff


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References
2021-08-06ESET ResearchZuzana Hromcová, Anton Cherepanov
@online{hromcov:20210806:anatomy:27b293f, author = {Zuzana Hromcová and Anton Cherepanov}, title = {{Anatomy of native IIS malware}}, date = {2021-08-06}, organization = {ESET Research}, url = {https://www.welivesecurity.com/2021/08/06/anatomy-native-iis-malware/}, language = {English}, urldate = {2021-08-09} } Anatomy of native IIS malware
IISniff RGDoor
2021-08-04ESET ResearchZuzana Hromcová
@techreport{hromcov:20210804:anatomy:2bcd04b, author = {Zuzana Hromcová}, title = {{Anatomy of Native IIS Malware (slides)}}, date = {2021-08-04}, institution = {ESET Research}, url = {https://i.blackhat.com/USA21/Wednesday-Handouts/us-21-Anatomy-Of-Native-Iis-Malware.pdf}, language = {English}, urldate = {2021-08-06} } Anatomy of Native IIS Malware (slides)
IISniff RGDoor
2021-08-04ESET ResearchZuzana Hromcová
@techreport{hromcov:20210804:anatomy:e1c9d94, author = {Zuzana Hromcová}, title = {{Anatomy of Native IIS Malware (white papaer)}}, date = {2021-08-04}, institution = {ESET Research}, url = {https://i.blackhat.com/USA21/Wednesday-Handouts/us-21-Anatomy-Of-Native-Iis-Malware-wp.pdf}, language = {English}, urldate = {2021-08-06} } Anatomy of Native IIS Malware (white papaer)
IISniff RGDoor
2013-12-09TrustwaveJosh Grunzweig
@online{grunzweig:20131209:curious:8c64525, author = {Josh Grunzweig}, title = {{The Curious Case of the Malicious IIS Module}}, date = {2013-12-09}, organization = {Trustwave}, url = {https://www.trustwave.com/Resources/SpiderLabs-Blog/The-Curious-Case-of-the-Malicious-IIS-Module/}, language = {English}, urldate = {2019-12-04} } The Curious Case of the Malicious IIS Module
IISniff
Yara Rules
[TLP:WHITE] win_iisniff_auto (20220411 | Detects win.iisniff.)
rule win_iisniff_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.iisniff."
        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.iisniff"
        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 = { 50 8d842494000000 64a300000000 80bc24a400000000 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   8d842494000000       | lea                 eax, dword ptr [esp + 0x94]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   80bc24a400000000     | cmp                 byte ptr [esp + 0xa4], 0

        $sequence_1 = { 51 e8???????? 33ff 57 bb0f000000 }
            // n = 5, score = 200
            //   51                   | push                ecx
            //   e8????????           |                     
            //   33ff                 | xor                 edi, edi
            //   57                   | push                edi
            //   bb0f000000           | mov                 ebx, 0xf

        $sequence_2 = { ebba 8b474c 85c0 7504 8bc6 }
            // n = 5, score = 200
            //   ebba                 | jmp                 0xffffffbc
            //   8b474c               | mov                 eax, dword ptr [edi + 0x4c]
            //   85c0                 | test                eax, eax
            //   7504                 | jne                 6
            //   8bc6                 | mov                 eax, esi

        $sequence_3 = { 6a03 68000000c0 68???????? ff15???????? 6a02 }
            // n = 5, score = 200
            //   6a03                 | push                3
            //   68000000c0           | push                0xc0000000
            //   68????????           |                     
            //   ff15????????         |                     
            //   6a02                 | push                2

        $sequence_4 = { 8d460c 8b4f68 50 51 e8???????? 83c408 }
            // n = 6, score = 200
            //   8d460c               | lea                 eax, dword ptr [esi + 0xc]
            //   8b4f68               | mov                 ecx, dword ptr [edi + 0x68]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

        $sequence_5 = { 3bc6 89442414 0f8d96000000 8d8424dc000000 }
            // n = 4, score = 200
            //   3bc6                 | cmp                 eax, esi
            //   89442414             | mov                 dword ptr [esp + 0x14], eax
            //   0f8d96000000         | jge                 0x9c
            //   8d8424dc000000       | lea                 eax, dword ptr [esp + 0xdc]

        $sequence_6 = { 8b4c2414 8bc2 8bd6 e8???????? 85c0 }
            // n = 5, score = 200
            //   8b4c2414             | mov                 ecx, dword ptr [esp + 0x14]
            //   8bc2                 | mov                 eax, edx
            //   8bd6                 | mov                 edx, esi
            //   e8????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_7 = { 8b742414 3b7014 7505 e8???????? }
            // n = 4, score = 200
            //   8b742414             | mov                 esi, dword ptr [esp + 0x14]
            //   3b7014               | cmp                 esi, dword ptr [eax + 0x14]
            //   7505                 | jne                 7
            //   e8????????           |                     

        $sequence_8 = { 807de800 7507 be04000000 eb69 c645fc01 8b0f }
            // n = 6, score = 200
            //   807de800             | cmp                 byte ptr [ebp - 0x18], 0
            //   7507                 | jne                 9
            //   be04000000           | mov                 esi, 4
            //   eb69                 | jmp                 0x6b
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   8b0f                 | mov                 ecx, dword ptr [edi]

        $sequence_9 = { 8365fc00 837d1000 57 8bf9 7e5f }
            // n = 5, score = 200
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0
            //   57                   | push                edi
            //   8bf9                 | mov                 edi, ecx
            //   7e5f                 | jle                 0x61

        $sequence_10 = { ff5010 8b38 6a01 56 89442420 }
            // n = 5, score = 200
            //   ff5010               | call                dword ptr [eax + 0x10]
            //   8b38                 | mov                 edi, dword ptr [eax]
            //   6a01                 | push                1
            //   56                   | push                esi
            //   89442420             | mov                 dword ptr [esp + 0x20], eax

        $sequence_11 = { 50 8d442470 64a300000000 8b5d08 83ceff }
            // n = 5, score = 200
            //   50                   | push                eax
            //   8d442470             | lea                 eax, dword ptr [esp + 0x70]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   83ceff               | or                  esi, 0xffffffff

        $sequence_12 = { 8b54240c 52 e8???????? 8b4f08 8b9780000000 83c404 8bd8 }
            // n = 7, score = 200
            //   8b54240c             | mov                 edx, dword ptr [esp + 0xc]
            //   52                   | push                edx
            //   e8????????           |                     
            //   8b4f08               | mov                 ecx, dword ptr [edi + 8]
            //   8b9780000000         | mov                 edx, dword ptr [edi + 0x80]
            //   83c404               | add                 esp, 4
            //   8bd8                 | mov                 ebx, eax

        $sequence_13 = { e8???????? 8b07 8b4004 03c7 395808 0f9445e8 33f6 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   03c7                 | add                 eax, edi
            //   395808               | cmp                 dword ptr [eax + 8], ebx
            //   0f9445e8             | sete                byte ptr [ebp - 0x18]
            //   33f6                 | xor                 esi, esi

        $sequence_14 = { e8???????? 3b3d???????? 7428 8b4704 8b0f 8908 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   3b3d????????         |                     
            //   7428                 | je                  0x2a
            //   8b4704               | mov                 eax, dword ptr [edi + 4]
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   8908                 | mov                 dword ptr [eax], ecx

    condition:
        7 of them and filesize < 1441792
}
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