SYMBOLCOMMON_NAMEaka. SYNONYMS
win.faketc (Back to overview)

FakeTC


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References
2015-07-30ESET ResearchRobert Lipovsky, Anton Cherepanov
@techreport{lipovsky:20150730:operation:bfe3508, author = {Robert Lipovsky and Anton Cherepanov}, title = {{Operation Potao Express: Analysis of a cyber‑espionage toolkit}}, date = {2015-07-30}, institution = {ESET Research}, url = {https://www.welivesecurity.com/wp-content/uploads/2015/07/Operation-Potao-Express_final_v2.pdf}, language = {English}, urldate = {2020-02-25} } Operation Potao Express: Analysis of a cyber‑espionage toolkit
FakeTC
2015-07-30ESET ResearchRobert Lipovsky, Anton Cherepanov
@online{lipovsky:20150730:operation:3e5afee, author = {Robert Lipovsky and Anton Cherepanov}, title = {{Operation Potao Express: Analysis of a cyber‑espionage toolkit}}, date = {2015-07-30}, organization = {ESET Research}, url = {http://www.welivesecurity.com/2015/07/30/operation-potao-express/}, language = {English}, urldate = {2019-12-20} } Operation Potao Express: Analysis of a cyber‑espionage toolkit
FakeTC
Yara Rules
[TLP:WHITE] win_faketc_auto (20220516 | Detects win.faketc.)
rule win_faketc_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.faketc."
        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.faketc"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { d1f8 50 52 8bc7 e8???????? 892d???????? 8bc7 }
            // n = 7, score = 100
            //   d1f8                 | sar                 eax, 1
            //   50                   | push                eax
            //   52                   | push                edx
            //   8bc7                 | mov                 eax, edi
            //   e8????????           |                     
            //   892d????????         |                     
            //   8bc7                 | mov                 eax, edi

        $sequence_1 = { 99 2bc2 57 8bf8 8b44241c 99 2bc2 }
            // n = 7, score = 100
            //   99                   | cdq                 
            //   2bc2                 | sub                 eax, edx
            //   57                   | push                edi
            //   8bf8                 | mov                 edi, eax
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   99                   | cdq                 
            //   2bc2                 | sub                 eax, edx

        $sequence_2 = { c68424700700000e 83bc24ec00000010 7210 8b8424d8000000 50 e8???????? 83c404 }
            // n = 7, score = 100
            //   c68424700700000e     | mov                 byte ptr [esp + 0x770], 0xe
            //   83bc24ec00000010     | cmp                 dword ptr [esp + 0xec], 0x10
            //   7210                 | jb                  0x12
            //   8b8424d8000000       | mov                 eax, dword ptr [esp + 0xd8]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_3 = { 8b4df8 833900 7504 33c0 eb27 8b55f8 8b02 }
            // n = 7, score = 100
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   833900               | cmp                 dword ptr [ecx], 0
            //   7504                 | jne                 6
            //   33c0                 | xor                 eax, eax
            //   eb27                 | jmp                 0x29
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   8b02                 | mov                 eax, dword ptr [edx]

        $sequence_4 = { e9???????? 8d8db8060000 e9???????? 8b542408 8d420c 8b8ad4c4ffff 33c8 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   8d8db8060000         | lea                 ecx, [ebp + 0x6b8]
            //   e9????????           |                     
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   8d420c               | lea                 eax, [edx + 0xc]
            //   8b8ad4c4ffff         | mov                 ecx, dword ptr [edx - 0x3b2c]
            //   33c8                 | xor                 ecx, eax

        $sequence_5 = { 8d4708 51 e8???????? 83c408 85c0 0f8546f9ffff 8b6c2414 }
            // n = 7, score = 100
            //   8d4708               | lea                 eax, [edi + 8]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   0f8546f9ffff         | jne                 0xfffff94c
            //   8b6c2414             | mov                 ebp, dword ptr [esp + 0x14]

        $sequence_6 = { c745b800000000 33db 81fb00010000 895dc4 0f8dd6010000 8b8740440000 33d2 }
            // n = 7, score = 100
            //   c745b800000000       | mov                 dword ptr [ebp - 0x48], 0
            //   33db                 | xor                 ebx, ebx
            //   81fb00010000         | cmp                 ebx, 0x100
            //   895dc4               | mov                 dword ptr [ebp - 0x3c], ebx
            //   0f8dd6010000         | jge                 0x1dc
            //   8b8740440000         | mov                 eax, dword ptr [edi + 0x4440]
            //   33d2                 | xor                 edx, edx

        $sequence_7 = { c745ac56e16300 8b4dac 51 68???????? 8b55fc 52 e8???????? }
            // n = 7, score = 100
            //   c745ac56e16300       | mov                 dword ptr [ebp - 0x54], 0x63e156
            //   8b4dac               | mov                 ecx, dword ptr [ebp - 0x54]
            //   51                   | push                ecx
            //   68????????           |                     
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_8 = { 8db41e9979825a 8bde c1cb1b 03dd 035858 c1ca02 d1c1 }
            // n = 7, score = 100
            //   8db41e9979825a       | lea                 esi, [esi + ebx + 0x5a827999]
            //   8bde                 | mov                 ebx, esi
            //   c1cb1b               | ror                 ebx, 0x1b
            //   03dd                 | add                 ebx, ebp
            //   035858               | add                 ebx, dword ptr [eax + 0x58]
            //   c1ca02               | ror                 edx, 2
            //   d1c1                 | rol                 ecx, 1

        $sequence_9 = { c3 5e 5f 33c0 5b c3 5d }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   5d                   | pop                 ebp

    condition:
        7 of them and filesize < 6864896
}
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