SYMBOLCOMMON_NAMEaka. SYNONYMS
win.taurus_stealer (Back to overview)

Taurus Stealer


According to Zscaler, Taurus is a stealer that surfaced in June 2020. It is being developed by the author(s) that previously created Predator the Thief. The name overlaps partly with the StealerOne / Terra* family (also aliased Taurus Loader) but appears to be a completely disjunct project.

References
2021-03-15MinervaLabsTom Roter
@online{roter:20210315:taurus:c3ab709, author = {Tom Roter}, title = {{Taurus Stealer's Evolution}}, date = {2021-03-15}, organization = {MinervaLabs}, url = {https://blog.minerva-labs.com/taurus-stealers-evolution}, language = {English}, urldate = {2021-03-31} } Taurus Stealer's Evolution
Taurus Stealer
2020-09-07Github (StrangerealIntel)StrangerealIntel
@online{strangerealintel:20200907:time:07064dc, author = {StrangerealIntel}, title = {{Time to take the bull by the horns}}, date = {2020-09-07}, organization = {Github (StrangerealIntel)}, url = {https://github.com/StrangerealIntel/CyberThreatIntel/blob/master/Additional%20Analysis/UnknownTA/2020-09-07/Analysis.md}, language = {English}, urldate = {2020-09-15} } Time to take the bull by the horns
RedLine Stealer Taurus Stealer
2020-06-26ZscalerAvinash Kumar, Uday Pratap Singh
@online{kumar:20200626:taurus:4d00888, author = {Avinash Kumar and Uday Pratap Singh}, title = {{Taurus: The New Stealer in Town}}, date = {2020-06-26}, organization = {Zscaler}, url = {https://www.zscaler.com/blogs/research/taurus-new-stealer-town}, language = {English}, urldate = {2020-08-13} } Taurus: The New Stealer in Town
Taurus Stealer
Yara Rules
[TLP:WHITE] win_taurus_stealer_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_taurus_stealer_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.taurus_stealer"
        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 = { 8d4dd8 0f4345e4 8a0418 8845ff 8d45ff 50 e8???????? }
            // n = 7, score = 200
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   0f4345e4             | cmovae              eax, dword ptr [ebp - 0x1c]
            //   8a0418               | mov                 al, byte ptr [eax + ebx]
            //   8845ff               | mov                 byte ptr [ebp - 1], al
            //   8d45ff               | lea                 eax, [ebp - 1]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_1 = { 50 e8???????? 56 8d4dcd 8ad8 e8???????? 46 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   56                   | push                esi
            //   8d4dcd               | lea                 ecx, [ebp - 0x33]
            //   8ad8                 | mov                 bl, al
            //   e8????????           |                     
            //   46                   | inc                 esi

        $sequence_2 = { 40 894704 c1e818 33c1 c1e908 0fb6c0 330c8548824300 }
            // n = 7, score = 200
            //   40                   | inc                 eax
            //   894704               | mov                 dword ptr [edi + 4], eax
            //   c1e818               | shr                 eax, 0x18
            //   33c1                 | xor                 eax, ecx
            //   c1e908               | shr                 ecx, 8
            //   0fb6c0               | movzx               eax, al
            //   330c8548824300       | xor                 ecx, dword ptr [eax*4 + 0x438248]

        $sequence_3 = { 0b4dfc 8bc3 2345fc 23cf 0bc8 c1c205 034df8 }
            // n = 7, score = 200
            //   0b4dfc               | or                  ecx, dword ptr [ebp - 4]
            //   8bc3                 | mov                 eax, ebx
            //   2345fc               | and                 eax, dword ptr [ebp - 4]
            //   23cf                 | and                 ecx, edi
            //   0bc8                 | or                  ecx, eax
            //   c1c205               | rol                 edx, 5
            //   034df8               | add                 ecx, dword ptr [ebp - 8]

        $sequence_4 = { c78579ffffff632d222e b143 c7857dffffff26796300 8bc2 308c0576ffffff 40 83f80a }
            // n = 7, score = 200
            //   c78579ffffff632d222e     | mov    dword ptr [ebp - 0x87], 0x2e222d63
            //   b143                 | mov                 cl, 0x43
            //   c7857dffffff26796300     | mov    dword ptr [ebp - 0x83], 0x637926
            //   8bc2                 | mov                 eax, edx
            //   308c0576ffffff       | xor                 byte ptr [ebp + eax - 0x8a], cl
            //   40                   | inc                 eax
            //   83f80a               | cmp                 eax, 0xa

        $sequence_5 = { 28440dda 41 83f911 72e6 8d45da 885deb 50 }
            // n = 7, score = 200
            //   28440dda             | sub                 byte ptr [ebp + ecx - 0x26], al
            //   41                   | inc                 ecx
            //   83f911               | cmp                 ecx, 0x11
            //   72e6                 | jb                  0xffffffe8
            //   8d45da               | lea                 eax, [ebp - 0x26]
            //   885deb               | mov                 byte ptr [ebp - 0x15], bl
            //   50                   | push                eax

        $sequence_6 = { e8???????? 8b450c 2bde 53 8d80f8874300 03c6 50 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   2bde                 | sub                 ebx, esi
            //   53                   | push                ebx
            //   8d80f8874300         | lea                 eax, [eax + 0x4387f8]
            //   03c6                 | add                 eax, esi
            //   50                   | push                eax

        $sequence_7 = { 55 8bec 8b512c 8b09 e8???????? 6a00 }
            // n = 6, score = 200
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b512c               | mov                 edx, dword ptr [ecx + 0x2c]
            //   8b09                 | mov                 ecx, dword ptr [ecx]
            //   e8????????           |                     
            //   6a00                 | push                0

        $sequence_8 = { 8b5dec 03c1 8b4df0 334dac c1cb02 334de0 8945f8 }
            // n = 7, score = 200
            //   8b5dec               | mov                 ebx, dword ptr [ebp - 0x14]
            //   03c1                 | add                 eax, ecx
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   334dac               | xor                 ecx, dword ptr [ebp - 0x54]
            //   c1cb02               | ror                 ebx, 2
            //   334de0               | xor                 ecx, dword ptr [ebp - 0x20]
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $sequence_9 = { 50 6800040000 56 52 52 8d4598 50 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   6800040000           | push                0x400
            //   56                   | push                esi
            //   52                   | push                edx
            //   52                   | push                edx
            //   8d4598               | lea                 eax, [ebp - 0x68]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 524288
}
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