SYMBOLCOMMON_NAMEaka. SYNONYMS
win.ironhalo (Back to overview)

IRONHALO

Actor(s): APT 16


IRONHALO is a downloader that uses the HTTP protocol to retrieve a Base64 encoded payload from a hard-coded command-and-control (CnC) server and uniform resource locator (URL) path.
The encoded payload is written to a temporary file, decoded and executed in a hidden window. The encoded and decoded payloads are written to files named igfxHK[%rand%].dat and igfxHK[%rand%].exe respectively, where [%rand%] is a 4-byte hexadecimal number based on the current timestamp. It persists by copying itself to the current user’s Startup folder.

References
2019-12-12FireEyeChi-en Shen, Oleg Bondarenko
@online{shen:20191212:cyber:e01baca, author = {Chi-en Shen and Oleg Bondarenko}, title = {{Cyber Threat Landscape in Japan – Revealing Threat in the Shadow}}, date = {2019-12-12}, organization = {FireEye}, url = {https://www.slideshare.net/codeblue_jp/cb19-cyber-threat-landscape-in-japan-revealing-threat-in-the-shadow-by-chi-en-shen-ashley-oleg-bondarenko}, language = {English}, urldate = {2020-04-16} } Cyber Threat Landscape in Japan – Revealing Threat in the Shadow
Cerberus TSCookie Cobalt Strike Dtrack Emotet Formbook IcedID Icefog IRONHALO Loki Password Stealer (PWS) PandaBanker PLEAD poisonplug TrickBot BlackTech
2015-12-21SymantecKevin Savage
@online{savage:20151221:downloaderironhalo:028233f, author = {Kevin Savage}, title = {{Downloader.Ironhalo}}, date = {2015-12-21}, organization = {Symantec}, url = {https://www.symantec.com/security-center/writeup/2015-122210-5128-99}, language = {English}, urldate = {2019-11-27} } Downloader.Ironhalo
IRONHALO
2015-12-21FireEyeRyann Winters, FireEye Threat Intelligence
@online{winters:20151221:eps:808808c, author = {Ryann Winters and FireEye Threat Intelligence}, title = {{The EPS Awakens - Part 2}}, date = {2015-12-21}, organization = {FireEye}, url = {https://www.fireeye.com/blog/threat-research/2015/12/the-eps-awakens-part-two.html}, language = {English}, urldate = {2019-12-20} } The EPS Awakens - Part 2
ELMER IRONHALO EvilPost
2015-12-16FireEyeGenwei Jiang, Dan Caselden, Ryann Winters
@online{jiang:20151216:eps:3db357c, author = {Genwei Jiang and Dan Caselden and Ryann Winters}, title = {{The EPS Awakens}}, date = {2015-12-16}, organization = {FireEye}, url = {https://www.fireeye.com/blog/threat-research/2015/12/the_eps_awakens.html}, language = {English}, urldate = {2019-12-20} } The EPS Awakens
IRONHALO APT 16
Yara Rules
[TLP:WHITE] win_ironhalo_auto (20200529 | autogenerated rule brought to you by yara-signator)
rule win_ironhalo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.ironhalo"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        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 / approach 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 = { 83e61f 8d1c8560e04000 c1e603 8b03 f644300401 }
            // n = 5, score = 100
            //   83e61f               | and                 esi, 0x1f
            //   8d1c8560e04000       | lea                 ebx, [eax*4 + 0x40e060]
            //   c1e603               | shl                 esi, 3
            //   8b03                 | mov                 eax, dword ptr [ebx]
            //   f644300401           | test                byte ptr [eax + esi + 4], 1

        $sequence_1 = { 7429 84d2 7425 0fb6d2 f68221cf400004 740c ff01 }
            // n = 7, score = 100
            //   7429                 | je                  0x2b
            //   84d2                 | test                dl, dl
            //   7425                 | je                  0x27
            //   0fb6d2               | movzx               edx, dl
            //   f68221cf400004       | test                byte ptr [edx + 0x40cf21], 4
            //   740c                 | je                  0xe
            //   ff01                 | inc                 dword ptr [ecx]

        $sequence_2 = { 8944240c 85c0 7502 5e c3 53 }
            // n = 6, score = 100
            //   8944240c             | mov                 dword ptr [esp + 0xc], eax
            //   85c0                 | test                eax, eax
            //   7502                 | jne                 4
            //   5e                   | pop                 esi
            //   c3                   | ret                 
            //   53                   | push                ebx

        $sequence_3 = { c1e005 50 ffd7 8d742428 bb03000000 8d442438 }
            // n = 6, score = 100
            //   c1e005               | shl                 eax, 5
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   8d742428             | lea                 esi, [esp + 0x28]
            //   bb03000000           | mov                 ebx, 3
            //   8d442438             | lea                 eax, [esp + 0x38]

        $sequence_4 = { c1e902 83e203 83f908 7229 f3a5 ff2495286d4000 }
            // n = 6, score = 100
            //   c1e902               | shr                 ecx, 2
            //   83e203               | and                 edx, 3
            //   83f908               | cmp                 ecx, 8
            //   7229                 | jb                  0x2b
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   ff2495286d4000       | jmp                 dword ptr [edx*4 + 0x406d28]

        $sequence_5 = { 742e 85f6 7419 0fb6da f68321cf400004 7406 }
            // n = 6, score = 100
            //   742e                 | je                  0x30
            //   85f6                 | test                esi, esi
            //   7419                 | je                  0x1b
            //   0fb6da               | movzx               ebx, dl
            //   f68321cf400004       | test                byte ptr [ebx + 0x40cf21], 4
            //   7406                 | je                  8

        $sequence_6 = { 7416 8088????????10 8a9405ecfdffff 889020ce4000 eb1c f6c202 }
            // n = 6, score = 100
            //   7416                 | je                  0x18
            //   8088????????10       |                     
            //   8a9405ecfdffff       | mov                 dl, byte ptr [ebp + eax - 0x214]
            //   889020ce4000         | mov                 byte ptr [eax + 0x40ce20], dl
            //   eb1c                 | jmp                 0x1e
            //   f6c202               | test                dl, 2

        $sequence_7 = { 83fbff 7416 8bc3 8bcb c1f805 83e11f 8b048560e04000 }
            // n = 7, score = 100
            //   83fbff               | cmp                 ebx, -1
            //   7416                 | je                  0x18
            //   8bc3                 | mov                 eax, ebx
            //   8bcb                 | mov                 ecx, ebx
            //   c1f805               | sar                 eax, 5
            //   83e11f               | and                 ecx, 0x1f
            //   8b048560e04000       | mov                 eax, dword ptr [eax*4 + 0x40e060]

        $sequence_8 = { c1f805 83e61f 8d1c8560e04000 c1e603 8b03 }
            // n = 5, score = 100
            //   c1f805               | sar                 eax, 5
            //   83e61f               | and                 esi, 0x1f
            //   8d1c8560e04000       | lea                 ebx, [eax*4 + 0x40e060]
            //   c1e603               | shl                 esi, 3
            //   8b03                 | mov                 eax, dword ptr [ebx]

        $sequence_9 = { 51 ffd6 8d542410 8d442424 52 50 }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   ffd6                 | call                esi
            //   8d542410             | lea                 edx, [esp + 0x10]
            //   8d442424             | lea                 eax, [esp + 0x24]
            //   52                   | push                edx
            //   50                   | push                eax

    condition:
        7 of them and filesize < 115480
}
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