SYMBOLCOMMON_NAMEaka. SYNONYMS
win.heloag (Back to overview)

Heloag


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References
2010-05-03Kaspersky LabsGeorg Wicherski
@online{wicherski:20100503:heloag:cb3ed5e, author = {Georg Wicherski}, title = {{Heloag has rather no friends, just a master}}, date = {2010-05-03}, organization = {Kaspersky Labs}, url = {https://securelist.com/heloag-has-rather-no-friends-just-a-master/29693/}, language = {English}, urldate = {2019-12-20} } Heloag has rather no friends, just a master
Heloag
Yara Rules
[TLP:WHITE] win_heloag_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_heloag_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.heloag"
        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 = { f3a5 8bc8 33c0 83e103 8895d4fcffff f3a4 b940000000 }
            // n = 7, score = 300
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8bc8                 | mov                 ecx, eax
            //   33c0                 | xor                 eax, eax
            //   83e103               | and                 ecx, 3
            //   8895d4fcffff         | mov                 byte ptr [ebp - 0x32c], dl
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   b940000000           | mov                 ecx, 0x40

        $sequence_1 = { 53 53 8d48ff 68???????? 8bd1 }
            // n = 5, score = 300
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d48ff               | lea                 ecx, [eax - 1]
            //   68????????           |                     
            //   8bd1                 | mov                 edx, ecx

        $sequence_2 = { c1e902 f3a5 8bcb 8d95dcfeffff }
            // n = 4, score = 300
            //   c1e902               | shr                 ecx, 2
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8bcb                 | mov                 ecx, ebx
            //   8d95dcfeffff         | lea                 edx, [ebp - 0x124]

        $sequence_3 = { 68???????? f3a4 ffd3 50 }
            // n = 4, score = 300
            //   68????????           |                     
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   ffd3                 | call                ebx
            //   50                   | push                eax

        $sequence_4 = { 83c261 52 99 f7f9 8b45ea 25ffff0000 }
            // n = 6, score = 300
            //   83c261               | add                 edx, 0x61
            //   52                   | push                edx
            //   99                   | cdq                 
            //   f7f9                 | idiv                ecx
            //   8b45ea               | mov                 eax, dword ptr [ebp - 0x16]
            //   25ffff0000           | and                 eax, 0xffff

        $sequence_5 = { 8bc1 8bf7 8bfa 8d95e0faffff }
            // n = 4, score = 300
            //   8bc1                 | mov                 eax, ecx
            //   8bf7                 | mov                 esi, edi
            //   8bfa                 | mov                 edi, edx
            //   8d95e0faffff         | lea                 edx, [ebp - 0x520]

        $sequence_6 = { b909000000 be???????? bf???????? c605????????05 53 f3a5 }
            // n = 6, score = 300
            //   b909000000           | mov                 ecx, 9
            //   be????????           |                     
            //   bf????????           |                     
            //   c605????????05       |                     
            //   53                   | push                ebx
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]

        $sequence_7 = { 90 a1???????? 8d4de4 51 8945fc c745dc00000000 c745e000000000 }
            // n = 7, score = 300
            //   90                   | nop                 
            //   a1????????           |                     
            //   8d4de4               | lea                 ecx, [ebp - 0x1c]
            //   51                   | push                ecx
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   c745dc00000000       | mov                 dword ptr [ebp - 0x24], 0
            //   c745e000000000       | mov                 dword ptr [ebp - 0x20], 0

        $sequence_8 = { 8a442413 6a00 8bce 8806 }
            // n = 4, score = 200
            //   8a442413             | mov                 al, byte ptr [esp + 0x13]
            //   6a00                 | push                0
            //   8bce                 | mov                 ecx, esi
            //   8806                 | mov                 byte ptr [esi], al

        $sequence_9 = { ff15???????? 8a4c2413 6a00 884c244c 8d4c244c }
            // n = 5, score = 200
            //   ff15????????         |                     
            //   8a4c2413             | mov                 cl, byte ptr [esp + 0x13]
            //   6a00                 | push                0
            //   884c244c             | mov                 byte ptr [esp + 0x4c], cl
            //   8d4c244c             | lea                 ecx, [esp + 0x4c]

        $sequence_10 = { 741f 8b7c2418 8bcb 8bd1 53 }
            // n = 5, score = 200
            //   741f                 | je                  0x21
            //   8b7c2418             | mov                 edi, dword ptr [esp + 0x18]
            //   8bcb                 | mov                 ecx, ebx
            //   8bd1                 | mov                 edx, ecx
            //   53                   | push                ebx

        $sequence_11 = { 53 8bcd ff15???????? 6a00 6a00 8bcd ff15???????? }
            // n = 7, score = 200
            //   53                   | push                ebx
            //   8bcd                 | mov                 ecx, ebp
            //   ff15????????         |                     
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8bcd                 | mov                 ecx, ebp
            //   ff15????????         |                     

        $sequence_12 = { 8bd9 8d4c2418 53 ff15???????? 84c0 741f }
            // n = 6, score = 200
            //   8bd9                 | mov                 ebx, ecx
            //   8d4c2418             | lea                 ecx, [esp + 0x18]
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   84c0                 | test                al, al
            //   741f                 | je                  0x21

        $sequence_13 = { 33ed 8b7e04 8b4e0c 3bcd 8b07 89442410 7464 }
            // n = 7, score = 200
            //   33ed                 | xor                 ebp, ebp
            //   8b7e04               | mov                 edi, dword ptr [esi + 4]
            //   8b4e0c               | mov                 ecx, dword ptr [esi + 0xc]
            //   3bcd                 | cmp                 ecx, ebp
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   7464                 | je                  0x66

        $sequence_14 = { 894b0c 8a48ff fec1 8848ff eb3c }
            // n = 5, score = 200
            //   894b0c               | mov                 dword ptr [ebx + 0xc], ecx
            //   8a48ff               | mov                 cl, byte ptr [eax - 1]
            //   fec1                 | inc                 cl
            //   8848ff               | mov                 byte ptr [eax - 1], cl
            //   eb3c                 | jmp                 0x3e

        $sequence_15 = { a1???????? 894304 8b5608 895308 }
            // n = 4, score = 200
            //   a1????????           |                     
            //   894304               | mov                 dword ptr [ebx + 4], eax
            //   8b5608               | mov                 edx, dword ptr [esi + 8]
            //   895308               | mov                 dword ptr [ebx + 8], edx

    condition:
        7 of them and filesize < 401408
}
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