SYMBOLCOMMON_NAMEaka. SYNONYMS
win.zeus_sphinx (Back to overview)

Zeus Sphinx


This family describes the vanilla Zeus-variant that includes TOR (and Polipo proxy). It has an almost 90% overlap with Zeus v2.0.8.9.
Please note that IBM X-Force decided to call win.zloader/win.zeus_openssl "Zeus Sphinx", after mentioning it as "a new version of Zeus Sphinx" in their initial post in August 2016. Malpedia thus lists the alias "Zeus XSphinx" for win.zeus_openssl - the X to refer to IBM X-Force.

Zeus Sphinx on the one hand has the following versioning ("slow increase")
- 2015/09 v1.0.1.0 (Zeus Sphinx size: 1.5 MB)
- 2016/02 v1.0.1.2 (Zeus Sphinx size: 1.5 MB)
- 2016/04 v1.0.2.0 (Zeus Sphinx size: 1.5 MB)

Zeus OpenSSL on the other hand has the following versioning ("fast increase")
- 2016/05 v1.5.4.0 (Zeus OpenSSL size: 1.2 MB)
- 2017/01 v1.14.8.0 (Zeus OpenSSL size: 1.8 MB)
- 2017/01 v1.15.0.0 (Zeus OpenSSL size: 2.2 MB)

References
2015-08-26Security AffairsPierluigi Paganini
@online{paganini:20150826:sphinx:dfbcee8, author = {Pierluigi Paganini}, title = {{Sphinx, a new variant of Zeus available for sale in the underground}}, date = {2015-08-26}, organization = {Security Affairs}, url = {https://securityaffairs.co/wordpress/39592/cyber-crime/sphinx-variant-zeus-trojan.html}, language = {English}, urldate = {2020-01-08} } Sphinx, a new variant of Zeus available for sale in the underground
Zeus Sphinx
2015-08-24DarkMattersBev Robb
@online{robb:20150824:sphinx:314a7b9, author = {Bev Robb}, title = {{Sphinx: New Zeus Variant for Sale on the Black Market}}, date = {2015-08-24}, organization = {DarkMatters}, url = {https://web.archive.org/web/20160130165709/http://darkmatters.norsecorp.com/2015/08/24/sphinx-new-zeus-variant-for-sale-on-the-black-market/}, language = {English}, urldate = {2020-01-13} } Sphinx: New Zeus Variant for Sale on the Black Market
Zeus Sphinx
Yara Rules
[TLP:WHITE] win_zeus_sphinx_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_zeus_sphinx_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.zeus_sphinx"
        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 = { 31c0 fc 8b7d0c 8b7508 }
            // n = 4, score = 400
            //   31c0                 | xor                 eax, eax
            //   fc                   | cld                 
            //   8b7d0c               | mov                 edi, dword ptr [ebp + 0xc]
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]

        $sequence_1 = { ffb5b0e7ffff e8???????? 58 ffb5b4e7ffff e8???????? 893424 }
            // n = 6, score = 400
            //   ffb5b0e7ffff         | push                dword ptr [ebp - 0x1850]
            //   e8????????           |                     
            //   58                   | pop                 eax
            //   ffb5b4e7ffff         | push                dword ptr [ebp - 0x184c]
            //   e8????????           |                     
            //   893424               | mov                 dword ptr [esp], esi

        $sequence_2 = { e8???????? 894704 8b4658 83780400 7426 8b55cc }
            // n = 6, score = 400
            //   e8????????           |                     
            //   894704               | mov                 dword ptr [edi + 4], eax
            //   8b4658               | mov                 eax, dword ptr [esi + 0x58]
            //   83780400             | cmp                 dword ptr [eax + 4], 0
            //   7426                 | je                  0x28
            //   8b55cc               | mov                 edx, dword ptr [ebp - 0x34]

        $sequence_3 = { 50 56 e8???????? 8b55d8 89c7 }
            // n = 5, score = 400
            //   50                   | push                eax
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b55d8               | mov                 edx, dword ptr [ebp - 0x28]
            //   89c7                 | mov                 edi, eax

        $sequence_4 = { 8945e8 f60602 7512 50 }
            // n = 4, score = 400
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   f60602               | test                byte ptr [esi], 2
            //   7512                 | jne                 0x14
            //   50                   | push                eax

        $sequence_5 = { 8985dcf7ffff 85c0 796e 83ec0c 56 e8???????? 8d85ecfbffff }
            // n = 7, score = 400
            //   8985dcf7ffff         | mov                 dword ptr [ebp - 0x824], eax
            //   85c0                 | test                eax, eax
            //   796e                 | jns                 0x70
            //   83ec0c               | sub                 esp, 0xc
            //   56                   | push                esi
            //   e8????????           |                     
            //   8d85ecfbffff         | lea                 eax, [ebp - 0x414]

        $sequence_6 = { c7466000000000 897718 8b4714 31d2 eb04 42 }
            // n = 6, score = 400
            //   c7466000000000       | mov                 dword ptr [esi + 0x60], 0
            //   897718               | mov                 dword ptr [edi + 0x18], esi
            //   8b4714               | mov                 eax, dword ptr [edi + 0x14]
            //   31d2                 | xor                 edx, edx
            //   eb04                 | jmp                 6
            //   42                   | inc                 edx

        $sequence_7 = { 41 39d1 75ef 83fa3f 7713 8b04df 898495e4fcffff }
            // n = 7, score = 400
            //   41                   | inc                 ecx
            //   39d1                 | cmp                 ecx, edx
            //   75ef                 | jne                 0xfffffff1
            //   83fa3f               | cmp                 edx, 0x3f
            //   7713                 | ja                  0x15
            //   8b04df               | mov                 eax, dword ptr [edi + ebx*8]
            //   898495e4fcffff       | mov                 dword ptr [ebp + edx*4 - 0x31c], eax

        $sequence_8 = { f7da f7d2 4d b98095da52 fec9 8b2c24 f7d9 }
            // n = 7, score = 100
            //   f7da                 | neg                 edx
            //   f7d2                 | not                 edx
            //   4d                   | dec                 ebp
            //   b98095da52           | mov                 ecx, 0x52da9580
            //   fec9                 | dec                 cl
            //   8b2c24               | mov                 ebp, dword ptr [esp]
            //   f7d9                 | neg                 ecx

        $sequence_9 = { 8b3c24 fc f7d9 f8 f6d2 }
            // n = 5, score = 100
            //   8b3c24               | mov                 edi, dword ptr [esp]
            //   fc                   | cld                 
            //   f7d9                 | neg                 ecx
            //   f8                   | clc                 
            //   f6d2                 | not                 dl

        $sequence_10 = { 8b2c24 8b0c24 fecb 368d30 8b0424 }
            // n = 5, score = 100
            //   8b2c24               | mov                 ebp, dword ptr [esp]
            //   8b0c24               | mov                 ecx, dword ptr [esp]
            //   fecb                 | dec                 bl
            //   368d30               | lea                 esi, ss:[eax]
            //   8b0424               | mov                 eax, dword ptr [esp]

        $sequence_11 = { 0f31 fecb b0e6 4b c0e12e }
            // n = 5, score = 100
            //   0f31                 | rdtsc               
            //   fecb                 | dec                 bl
            //   b0e6                 | mov                 al, 0xe6
            //   4b                   | dec                 ebx
            //   c0e12e               | shl                 cl, 0x2e

        $sequence_12 = { c0e245 f7d7 fece b5ce 8b3424 f7d1 }
            // n = 6, score = 100
            //   c0e245               | shl                 dl, 0x45
            //   f7d7                 | not                 edi
            //   fece                 | dec                 dh
            //   b5ce                 | mov                 ch, 0xce
            //   8b3424               | mov                 esi, dword ptr [esp]
            //   f7d1                 | not                 ecx

        $sequence_13 = { 8b3424 f7dd f9 368d38 c0e982 }
            // n = 5, score = 100
            //   8b3424               | mov                 esi, dword ptr [esp]
            //   f7dd                 | neg                 ebp
            //   f9                   | stc                 
            //   368d38               | lea                 edi, ss:[eax]
            //   c0e982               | shr                 cl, 0x82

        $sequence_14 = { 368d08 85c0 e9???????? c0e178 }
            // n = 4, score = 100
            //   368d08               | lea                 ecx, ss:[eax]
            //   85c0                 | test                eax, eax
            //   e9????????           |                     
            //   c0e178               | shl                 cl, 0x78

        $sequence_15 = { f7d6 fc 85f6 e9???????? bf0027b025 f7d6 f7d5 }
            // n = 7, score = 100
            //   f7d6                 | not                 esi
            //   fc                   | cld                 
            //   85f6                 | test                esi, esi
            //   e9????????           |                     
            //   bf0027b025           | mov                 edi, 0x25b02700
            //   f7d6                 | not                 esi
            //   f7d5                 | not                 ebp

    condition:
        7 of them and filesize < 3268608
}
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