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 (20200817 | autogenerated rule brought to you by yara-signator)
rule win_zeus_sphinx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.zeus_sphinx"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / approach 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 = { 57 57 ffb578ffffff 56 e8???????? 5b 5e }
            // n = 7, score = 400
            //   57                   | push                edi
            //   57                   | push                edi
            //   ffb578ffffff         | push                dword ptr [ebp - 0x88]
            //   56                   | push                esi
            //   e8????????           |                     
            //   5b                   | pop                 ebx
            //   5e                   | pop                 esi

        $sequence_1 = { 8b55e0 b820000000 29d0 8b55ec }
            // n = 4, score = 400
            //   8b55e0               | mov                 edx, dword ptr [ebp - 0x20]
            //   b820000000           | mov                 eax, 0x20
            //   29d0                 | sub                 eax, edx
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]

        $sequence_2 = { e8???????? b801000000 83c410 8d65f4 5b }
            // n = 5, score = 400
            //   e8????????           |                     
            //   b801000000           | mov                 eax, 1
            //   83c410               | add                 esp, 0x10
            //   8d65f4               | lea                 esp, [ebp - 0xc]
            //   5b                   | pop                 ebx

        $sequence_3 = { 53 83ec14 ff7510 ff750c }
            // n = 4, score = 400
            //   53                   | push                ebx
            //   83ec14               | sub                 esp, 0x14
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff750c               | push                dword ptr [ebp + 0xc]

        $sequence_4 = { e8???????? ba???????? 89d8 e8???????? 83c410 85c0 7e42 }
            // n = 7, score = 400
            //   e8????????           |                     
            //   ba????????           |                     
            //   89d8                 | mov                 eax, ebx
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   7e42                 | jle                 0x44

        $sequence_5 = { 83c410 83f800 0f84b5000000 7d44 83f8fe 751a }
            // n = 6, score = 400
            //   83c410               | add                 esp, 0x10
            //   83f800               | cmp                 eax, 0
            //   0f84b5000000         | je                  0xbb
            //   7d44                 | jge                 0x46
            //   83f8fe               | cmp                 eax, -2
            //   751a                 | jne                 0x1c

        $sequence_6 = { e9???????? 894308 897304 8b13 }
            // n = 4, score = 400
            //   e9????????           |                     
            //   894308               | mov                 dword ptr [ebx + 8], eax
            //   897304               | mov                 dword ptr [ebx + 4], esi
            //   8b13                 | mov                 edx, dword ptr [ebx]

        $sequence_7 = { 53 81eccc000000 8b0a 8b18 894d90 }
            // n = 5, score = 400
            //   53                   | push                ebx
            //   81eccc000000         | sub                 esp, 0xcc
            //   8b0a                 | mov                 ecx, dword ptr [edx]
            //   8b18                 | mov                 ebx, dword ptr [eax]
            //   894d90               | mov                 dword ptr [ebp - 0x70], ecx

        $sequence_8 = { 8b2c24 c0e1f4 f7dd feca }
            // n = 4, score = 100
            //   8b2c24               | mov                 ebp, dword ptr [esp]
            //   c0e1f4               | shl                 cl, 0xf4
            //   f7dd                 | neg                 ebp
            //   feca                 | dec                 dl

        $sequence_9 = { f9 be0045ad22 f7dd c0ea30 f7da }
            // n = 5, score = 100
            //   f9                   | stc                 
            //   be0045ad22           | mov                 esi, 0x22ad4500
            //   f7dd                 | neg                 ebp
            //   c0ea30               | shr                 dl, 0x30
            //   f7da                 | neg                 edx

        $sequence_10 = { f9 f6d0 368d08 fecc }
            // n = 4, score = 100
            //   f9                   | stc                 
            //   f6d0                 | not                 al
            //   368d08               | lea                 ecx, ss:[eax]
            //   fecc                 | dec                 ah

        $sequence_11 = { fec9 8b2c24 f6d1 fc f6d2 fec9 c0eaf4 }
            // n = 7, score = 100
            //   fec9                 | dec                 cl
            //   8b2c24               | mov                 ebp, dword ptr [esp]
            //   f6d1                 | not                 cl
            //   fc                   | cld                 
            //   f6d2                 | not                 dl
            //   fec9                 | dec                 cl
            //   c0eaf4               | shr                 dl, 0xf4

        $sequence_12 = { f6d1 f7d2 c0e1e8 c0eaee }
            // n = 4, score = 100
            //   f6d1                 | not                 cl
            //   f7d2                 | not                 edx
            //   c0e1e8               | shl                 cl, 0xe8
            //   c0eaee               | shr                 dl, 0xee

        $sequence_13 = { 50 e8???????? c3 8b4df0 81c160260000 e9???????? 8b4df0 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   c3                   | ret                 
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   81c160260000         | add                 ecx, 0x2660
            //   e9????????           |                     
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]

        $sequence_14 = { 8b0c24 c0e25c f7da c0ea0a fece }
            // n = 5, score = 100
            //   8b0c24               | mov                 ecx, dword ptr [esp]
            //   c0e25c               | shl                 dl, 0x5c
            //   f7da                 | neg                 edx
            //   c0ea0a               | shr                 dl, 0xa
            //   fece                 | dec                 dh

        $sequence_15 = { f7d2 f7d6 85d2 f9 368d08 bb003ace6c ba808ce521 }
            // n = 7, score = 100
            //   f7d2                 | not                 edx
            //   f7d6                 | not                 esi
            //   85d2                 | test                edx, edx
            //   f9                   | stc                 
            //   368d08               | lea                 ecx, ss:[eax]
            //   bb003ace6c           | mov                 ebx, 0x6cce3a00
            //   ba808ce521           | mov                 edx, 0x21e58c80

    condition:
        7 of them and filesize < 3268608
}
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