SYMBOLCOMMON_NAMEaka. SYNONYMS
win.compfun (Back to overview)

COMpfun

aka: Reductor RAT

There is no description at this point.

References
2020-05-14Kaspersky LabsGReAT
@online{great:20200514:compfun:eda09d1, author = {GReAT}, title = {{COMpfun authors spoof visa application with HTTP status-based Trojan}}, date = {2020-05-14}, organization = {Kaspersky Labs}, url = {https://securelist.com/compfun-http-status-based-trojan/96874/}, language = {English}, urldate = {2020-05-14} } COMpfun authors spoof visa application with HTTP status-based Trojan
COMpfun
2019-10-03Kaspersky LabsGReAT
@online{great:20191003:compfun:fd13b9e, author = {GReAT}, title = {{COMpfun successor Reductor infects files on the fly to compromise TLS traffic}}, date = {2019-10-03}, organization = {Kaspersky Labs}, url = {https://securelist.com/compfun-successor-reductor/93633/}, language = {English}, urldate = {2020-01-08} } COMpfun successor Reductor infects files on the fly to compromise TLS traffic
COMpfun
2019-08-01Kaspersky LabsGReAT
@online{great:20190801:trends:5e25d5b, author = {GReAT}, title = {{APT trends report Q2 2019}}, date = {2019-08-01}, organization = {Kaspersky Labs}, url = {https://securelist.com/apt-trends-report-q2-2019/91897/}, language = {English}, urldate = {2020-08-13} } APT trends report Q2 2019
ZooPark magecart POWERSTATS Chaperone COMpfun EternalPetya FinFisher RAT HawkEye Keylogger HOPLIGHT Microcin NjRAT Olympic Destroyer PLEAD RokRAT Triton Zebrocy Microcin
2014-10-30G DataG Data
@online{data:20141030:com:0da80b3, author = {G Data}, title = {{COM Object hijacking: the discreet way of persistence}}, date = {2014-10-30}, organization = {G Data}, url = {https://www.gdatasoftware.com/blog/2014/10/23941-com-object-hijacking-the-discreet-way-of-persistence}, language = {English}, urldate = {2020-01-07} } COM Object hijacking: the discreet way of persistence
COMpfun
Yara Rules
[TLP:WHITE] win_compfun_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_compfun_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.compfun"
        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 = { e8???????? 83c40c c7064f70656e c7460450726f63 c7460865737354 c7460c6f6b656e c6461000 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   c7064f70656e         | mov                 dword ptr [esi], 0x6e65704f
            //   c7460450726f63       | mov                 dword ptr [esi + 4], 0x636f7250
            //   c7460865737354       | mov                 dword ptr [esi + 8], 0x54737365
            //   c7460c6f6b656e       | mov                 dword ptr [esi + 0xc], 0x6e656b6f
            //   c6461000             | mov                 byte ptr [esi + 0x10], 0

        $sequence_1 = { c746046c2e646c c6460900 8bc6 5e }
            // n = 4, score = 300
            //   c746046c2e646c       | mov                 dword ptr [esi + 4], 0x6c642e6c
            //   c6460900             | mov                 byte ptr [esi + 9], 0
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi

        $sequence_2 = { 50 e8???????? 83c40c 33c0 6a09 5b 8bcb }
            // n = 7, score = 300
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   33c0                 | xor                 eax, eax
            //   6a09                 | push                9
            //   5b                   | pop                 ebx
            //   8bcb                 | mov                 ecx, ebx

        $sequence_3 = { 8b450c 53 8b5d14 8985a4fdffff }
            // n = 4, score = 300
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   53                   | push                ebx
            //   8b5d14               | mov                 ebx, dword ptr [ebp + 0x14]
            //   8985a4fdffff         | mov                 dword ptr [ebp - 0x25c], eax

        $sequence_4 = { c7064765744d c746046f64756c c746086546696c c7460c654e616d }
            // n = 4, score = 300
            //   c7064765744d         | mov                 dword ptr [esi], 0x4d746547
            //   c746046f64756c       | mov                 dword ptr [esi + 4], 0x6c75646f
            //   c746086546696c       | mov                 dword ptr [esi + 8], 0x6c694665
            //   c7460c654e616d       | mov                 dword ptr [esi + 0xc], 0x6d614e65

        $sequence_5 = { c7460c462d3436 c7461037432d38 c746144533442d c7461843343537 }
            // n = 4, score = 300
            //   c7460c462d3436       | mov                 dword ptr [esi + 0xc], 0x36342d46
            //   c7461037432d38       | mov                 dword ptr [esi + 0x10], 0x382d4337
            //   c746144533442d       | mov                 dword ptr [esi + 0x14], 0x2d443345
            //   c7461843343537       | mov                 dword ptr [esi + 0x18], 0x37353443

        $sequence_6 = { 56 e8???????? 83c40c c7066b65726e }
            // n = 4, score = 300
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   c7066b65726e         | mov                 dword ptr [esi], 0x6e72656b

        $sequence_7 = { e8???????? 59 50 57 ffd3 894624 85c0 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   57                   | push                edi
            //   ffd3                 | call                ebx
            //   894624               | mov                 dword ptr [esi + 0x24], eax
            //   85c0                 | test                eax, eax

        $sequence_8 = { 48894c2408 4881ec78090000 b904010000 e8???????? }
            // n = 4, score = 100
            //   48894c2408           | dec                 eax
            //   4881ec78090000       | mov                 dword ptr [esp + 8], ecx
            //   b904010000           | dec                 eax
            //   e8????????           |                     

        $sequence_9 = { c644244400 488b8c2480000000 8b442440 39410c }
            // n = 4, score = 100
            //   c644244400           | dec                 eax
            //   488b8c2480000000     | mov                 dword ptr [esp + 0x28], eax
            //   8b442440             | dec                 eax
            //   39410c               | lea                 eax, [esp + 0x50]

        $sequence_10 = { e8???????? c644243800 4883bc248000000000 7507 33c0 e9???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   c644243800           | dec                 eax
            //   4883bc248000000000     | mov    dword ptr [esp + 0x1c0], eax
            //   7507                 | dec                 eax
            //   33c0                 | mov                 edi, dword ptr [esp + 0x1c0]
            //   e9????????           |                     

        $sequence_11 = { 33c0 b90f000000 f3aa 488d442440 4889442450 }
            // n = 5, score = 100
            //   33c0                 | imul                edx, edx, 0x18
            //   b90f000000           | dec                 eax
            //   f3aa                 | mov                 ecx, dword ptr [esp + 0x28]
            //   488d442440           | dec                 eax
            //   4889442450           | mov                 ecx, dword ptr [ecx + 8]

        $sequence_12 = { 48898424c0010000 488bbc24c0010000 33c0 b9c0000000 f3aa }
            // n = 5, score = 100
            //   48898424c0010000     | cmp                 dword ptr [esp + 0x38], 0
            //   488bbc24c0010000     | jne                 0xf5
            //   33c0                 | dec                 eax
            //   b9c0000000           | mov                 edx, dword ptr [esp + 0x70]
            //   f3aa                 | dec                 eax

        $sequence_13 = { ba01000000 488b4c2460 e8???????? 48c744246000000000 e8???????? e8???????? }
            // n = 6, score = 100
            //   ba01000000           | add                 edx, 0x18d
            //   488b4c2460           | dec                 eax
            //   e8????????           |                     
            //   48c744246000000000     | lea    eax, [esp + 0x3c]
            //   e8????????           |                     
            //   e8????????           |                     

        $sequence_14 = { 8b4010 83c001 8bd0 486bd218 488b4c2428 488b4908 }
            // n = 6, score = 100
            //   8b4010               | sub                 esp, 0x978
            //   83c001               | mov                 ecx, 0x104
            //   8bd0                 | mov                 eax, dword ptr [eax + 0x10]
            //   486bd218             | add                 eax, 1
            //   488b4c2428           | mov                 edx, eax
            //   488b4908             | dec                 eax

        $sequence_15 = { 837c243800 0f85ea000000 488b542470 4881c28d010000 488d44243c 4889442428 488d442450 }
            // n = 7, score = 100
            //   837c243800           | xor                 eax, eax
            //   0f85ea000000         | mov                 ecx, 0xf
            //   488b542470           | rep stosb           byte ptr es:[edi], al
            //   4881c28d010000       | dec                 eax
            //   488d44243c           | lea                 eax, [esp + 0x40]
            //   4889442428           | dec                 eax
            //   488d442450           | mov                 dword ptr [esp + 0x50], eax

    condition:
        7 of them and filesize < 402432
}
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