SYMBOLCOMMON_NAMEaka. SYNONYMS
win.pss (Back to overview)

PC Surveillance System

aka: PSS

Citizenlab notes that PC Surveillance System (PSS) is a commercial spyware product offered by Cyberbit and marketed to intelligence and law enforcement agencies.

References
2017-12-06The Citizen LabBill Marczak, Geoffrey Alexander, Sarah McKune, John Scott-Railton, Ron Deibert
@online{marczak:20171206:champing:4cb4525, author = {Bill Marczak and Geoffrey Alexander and Sarah McKune and John Scott-Railton and Ron Deibert}, title = {{Champing at the Cyberbit Ethiopian Dissidents Targeted with New Commercial Spyware}}, date = {2017-12-06}, organization = {The Citizen Lab}, url = {https://citizenlab.ca/2017/12/champing-cyberbit-ethiopian-dissidents-targeted-commercial-spyware/}, language = {English}, urldate = {2019-11-23} } Champing at the Cyberbit Ethiopian Dissidents Targeted with New Commercial Spyware
PC Surveillance System
Yara Rules
[TLP:WHITE] win_pss_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_pss_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.pss"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 8d48fe e8???????? e9???????? 83f811 }
            // n = 4, score = 300
            //   8d48fe               | lea                 ecx, [eax - 2]
            //   e8????????           |                     
            //   e9????????           |                     
            //   83f811               | cmp                 eax, 0x11

        $sequence_1 = { 7437 ff15???????? 3de5030000 752a }
            // n = 4, score = 300
            //   7437                 | je                  0x39
            //   ff15????????         |                     
            //   3de5030000           | cmp                 eax, 0x3e5
            //   752a                 | jne                 0x2c

        $sequence_2 = { ff15???????? 83ceff 3bc6 7504 }
            // n = 4, score = 300
            //   ff15????????         |                     
            //   83ceff               | or                  esi, 0xffffffff
            //   3bc6                 | cmp                 eax, esi
            //   7504                 | jne                 6

        $sequence_3 = { 668985fcfdffff 8d85fefdffff 8bf1 57 }
            // n = 4, score = 200
            //   668985fcfdffff       | mov                 word ptr [ebp - 0x204], ax
            //   8d85fefdffff         | lea                 eax, [ebp - 0x202]
            //   8bf1                 | mov                 esi, ecx
            //   57                   | push                edi

        $sequence_4 = { 7527 83c801 a3???????? 68???????? c744241000000000 c705????????18630110 }
            // n = 6, score = 200
            //   7527                 | jne                 0x29
            //   83c801               | or                  eax, 1
            //   a3????????           |                     
            //   68????????           |                     
            //   c744241000000000     | mov                 dword ptr [esp + 0x10], 0
            //   c705????????18630110     |     

        $sequence_5 = { 8d8db0fbffff 6a00 6a01 e8???????? 6a00 }
            // n = 5, score = 200
            //   8d8db0fbffff         | lea                 ecx, [ebp - 0x450]
            //   6a00                 | push                0
            //   6a01                 | push                1
            //   e8????????           |                     
            //   6a00                 | push                0

        $sequence_6 = { 8d442418 50 6a20 ff15???????? 85c0 }
            // n = 5, score = 200
            //   8d442418             | lea                 eax, [esp + 0x18]
            //   50                   | push                eax
            //   6a20                 | push                0x20
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_7 = { 57 8bf2 56 6a08 8d55ec }
            // n = 5, score = 200
            //   57                   | push                edi
            //   8bf2                 | mov                 esi, edx
            //   56                   | push                esi
            //   6a08                 | push                8
            //   8d55ec               | lea                 edx, [ebp - 0x14]

        $sequence_8 = { 0f8d80000000 488d8c2430020000 448bc6 488bd3 }
            // n = 4, score = 100
            //   0f8d80000000         | dec                 esp
            //   488d8c2430020000     | mov                 dword ptr [esp + 0x58], esp
            //   448bc6               | dec                 eax
            //   488bd3               | lea                 edx, [esp + 0x50]

        $sequence_9 = { 6689442444 488d15b9ce0100 498bcf ff15???????? 4c8be8 4885c0 7555 }
            // n = 7, score = 100
            //   6689442444           | mov                 word ptr [esp + 0x44], ax
            //   488d15b9ce0100       | dec                 eax
            //   498bcf               | lea                 edx, [0x1ceb9]
            //   ff15????????         |                     
            //   4c8be8               | dec                 ecx
            //   4885c0               | mov                 ecx, edi
            //   7555                 | dec                 esp

        $sequence_10 = { 488d542450 488d4c2420 e8???????? 488d05fd160100 488d157ed90100 488d4c2420 4889442420 }
            // n = 7, score = 100
            //   488d542450           | mov                 ebx, dword ptr [ebx + 0x10]
            //   488d4c2420           | test                eax, eax
            //   e8????????           |                     
            //   488d05fd160100       | jne                 0xc7
            //   488d157ed90100       | lea                 ebx, [eax + 0xf]
            //   488d4c2420           | dec                 eax
            //   4889442420           | mov                 dword ptr [esp + 0x60], ebx

        $sequence_11 = { 0f85bcfeffff e8???????? 4c8d9c2420010000 b801000000 498b5b10 }
            // n = 5, score = 100
            //   0f85bcfeffff         | mov                 ebp, eax
            //   e8????????           |                     
            //   4c8d9c2420010000     | dec                 eax
            //   b801000000           | test                eax, eax
            //   498b5b10             | jne                 0x57

        $sequence_12 = { ff15???????? 85c0 0f85c1000000 8d580f 48895c2460 4c89642458 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   85c0                 | jne                 0xfffffec2
            //   0f85c1000000         | dec                 esp
            //   8d580f               | lea                 ebx, [esp + 0x120]
            //   48895c2460           | mov                 eax, 1
            //   4c89642458           | dec                 ecx

    condition:
        7 of them and filesize < 421888
}
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