SYMBOLCOMMON_NAMEaka. SYNONYMS
win.asprox (Back to overview)

Asprox

aka: Aseljo, BadSrc

There is no description at this point.

References
2015-08-10Palo Alto Networks Unit 42Ryan Olson
@online{olson:20150810:whats:37ceef6, author = {Ryan Olson}, title = {{What’s Next in Malware After Kuluoz?}}, date = {2015-08-10}, organization = {Palo Alto Networks Unit 42}, url = {https://researchcenter.paloaltonetworks.com/2015/08/whats-next-in-malware-after-kuluoz/}, language = {English}, urldate = {2019-12-20} } What’s Next in Malware After Kuluoz?
Asprox
2014-12-04Sergei Frankoff
@online{frankoff:20141204:inside:80c0fea, author = {Sergei Frankoff}, title = {{Inside The New Asprox/Kuluoz (October 2013 - January 2014)}}, date = {2014-12-04}, url = {http://oalabs.openanalysis.net/2014/12/04/inside-the-new-asprox-kuluoz-october-2013-january-2014/}, language = {English}, urldate = {2020-01-08} } Inside The New Asprox/Kuluoz (October 2013 - January 2014)
Asprox
2012-11-01Virus BulletinMicky Pun
@online{pun:20121101:tracking:1ca7e96, author = {Micky Pun}, title = {{Tracking the 2012 Sasfis campaign}}, date = {2012-11-01}, organization = {Virus Bulletin}, url = {https://www.virusbulletin.com/virusbulletin/2012/11/tracking-2012-sasfis-campaign}, language = {English}, urldate = {2020-01-09} } Tracking the 2012 Sasfis campaign
Asprox Sasfis
Yara Rules
[TLP:WHITE] win_asprox_auto (20220808 | Detects win.asprox.)
rule win_asprox_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.asprox."
        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.asprox"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 8b8d5cffffff 51 8b952cffffff 52 ff15???????? 898558ffffff 8b8560ffffff }
            // n = 7, score = 1200
            //   8b8d5cffffff         | mov                 ecx, dword ptr [ebp - 0xa4]
            //   51                   | push                ecx
            //   8b952cffffff         | mov                 edx, dword ptr [ebp - 0xd4]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   898558ffffff         | mov                 dword ptr [ebp - 0xa8], eax
            //   8b8560ffffff         | mov                 eax, dword ptr [ebp - 0xa0]

        $sequence_1 = { 8bce e8???????? 84c0 756d 8b8640fa0000 40 398640040000 }
            // n = 7, score = 1200
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   756d                 | jne                 0x6f
            //   8b8640fa0000         | mov                 eax, dword ptr [esi + 0xfa40]
            //   40                   | inc                 eax
            //   398640040000         | cmp                 dword ptr [esi + 0x440], eax

        $sequence_2 = { 51 8d956cffffff 52 6a00 8d45e8 50 6a00 }
            // n = 7, score = 1200
            //   51                   | push                ecx
            //   8d956cffffff         | lea                 edx, [ebp - 0x94]
            //   52                   | push                edx
            //   6a00                 | push                0
            //   8d45e8               | lea                 eax, [ebp - 0x18]
            //   50                   | push                eax
            //   6a00                 | push                0

        $sequence_3 = { 891a 8b5dbc 8b55c0 893a }
            // n = 4, score = 1200
            //   891a                 | mov                 dword ptr [edx], ebx
            //   8b5dbc               | mov                 ebx, dword ptr [ebp - 0x44]
            //   8b55c0               | mov                 edx, dword ptr [ebp - 0x40]
            //   893a                 | mov                 dword ptr [edx], edi

        $sequence_4 = { 7826 0fb6041a 66c1e008 66c1e908 660bc1 0fb7c8 0fb7c1 }
            // n = 7, score = 1200
            //   7826                 | js                  0x28
            //   0fb6041a             | movzx               eax, byte ptr [edx + ebx]
            //   66c1e008             | shl                 ax, 8
            //   66c1e908             | shr                 cx, 8
            //   660bc1               | or                  ax, cx
            //   0fb7c8               | movzx               ecx, ax
            //   0fb7c1               | movzx               eax, cx

        $sequence_5 = { 894508 41 3b4dc0 7ce5 ff75c0 8d8730180000 }
            // n = 6, score = 1200
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   41                   | inc                 ecx
            //   3b4dc0               | cmp                 ecx, dword ptr [ebp - 0x40]
            //   7ce5                 | jl                  0xffffffe7
            //   ff75c0               | push                dword ptr [ebp - 0x40]
            //   8d8730180000         | lea                 eax, [edi + 0x1830]

        $sequence_6 = { e8???????? 83c40c 6a00 8b4d10 51 }
            // n = 5, score = 1200
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6a00                 | push                0
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   51                   | push                ecx

        $sequence_7 = { 0f8352ffffff 8b0c91 894b38 c16b3808 0fb6c9 898340040000 894b3c }
            // n = 7, score = 1200
            //   0f8352ffffff         | jae                 0xffffff58
            //   8b0c91               | mov                 ecx, dword ptr [ecx + edx*4]
            //   894b38               | mov                 dword ptr [ebx + 0x38], ecx
            //   c16b3808             | shr                 dword ptr [ebx + 0x38], 8
            //   0fb6c9               | movzx               ecx, cl
            //   898340040000         | mov                 dword ptr [ebx + 0x440], eax
            //   894b3c               | mov                 dword ptr [ebx + 0x3c], ecx

        $sequence_8 = { 8b8e60020000 8b9664020000 f7d1 d1c2 33d1 }
            // n = 5, score = 1200
            //   8b8e60020000         | mov                 ecx, dword ptr [esi + 0x260]
            //   8b9664020000         | mov                 edx, dword ptr [esi + 0x264]
            //   f7d1                 | not                 ecx
            //   d1c2                 | rol                 edx, 1
            //   33d1                 | xor                 edx, ecx

        $sequence_9 = { 8d840a00100000 50 6a00 8b0d???????? 51 ff15???????? 8945fc }
            // n = 7, score = 1200
            //   8d840a00100000       | lea                 eax, [edx + ecx + 0x1000]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   8b0d????????         |                     
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   8945fc               | mov                 dword ptr [ebp - 4], eax

    condition:
        7 of them and filesize < 155648
}
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