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 (20220516 | Detects win.ironhalo.)
rule win_ironhalo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.ironhalo."
        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.ironhalo"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 89542424 6a01 50 6689542430 e8???????? }
            // n = 5, score = 200
            //   89542424             | mov                 dword ptr [esp + 0x24], edx
            //   6a01                 | push                1
            //   50                   | push                eax
            //   6689542430           | mov                 word ptr [esp + 0x30], dx
            //   e8????????           |                     

        $sequence_1 = { 81c420430000 c3 b941000000 33c0 8dbc2428010000 8d942428010000 f3ab }
            // n = 7, score = 200
            //   81c420430000         | add                 esp, 0x4320
            //   c3                   | ret                 
            //   b941000000           | mov                 ecx, 0x41
            //   33c0                 | xor                 eax, eax
            //   8dbc2428010000       | lea                 edi, [esp + 0x128]
            //   8d942428010000       | lea                 edx, [esp + 0x128]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_2 = { 8b0c8d60e04000 8d54c104 8a4cc104 f6c101 743e 8ac1 be00800000 }
            // n = 7, score = 200
            //   8b0c8d60e04000       | mov                 ecx, dword ptr [ecx*4 + 0x40e060]
            //   8d54c104             | lea                 edx, [ecx + eax*8 + 4]
            //   8a4cc104             | mov                 cl, byte ptr [ecx + eax*8 + 4]
            //   f6c101               | test                cl, 1
            //   743e                 | je                  0x40
            //   8ac1                 | mov                 al, cl
            //   be00800000           | mov                 esi, 0x8000

        $sequence_3 = { eb26 8d4508 8db68cc24000 6a00 }
            // n = 4, score = 200
            //   eb26                 | jmp                 0x28
            //   8d4508               | lea                 eax, [ebp + 8]
            //   8db68cc24000         | lea                 esi, [esi + 0x40c28c]
            //   6a00                 | push                0

        $sequence_4 = { c7442410e4a04000 8b7c2410 381f 7502 8ac2 }
            // n = 5, score = 200
            //   c7442410e4a04000     | mov                 dword ptr [esp + 0x10], 0x40a0e4
            //   8b7c2410             | mov                 edi, dword ptr [esp + 0x10]
            //   381f                 | cmp                 byte ptr [edi], bl
            //   7502                 | jne                 4
            //   8ac2                 | mov                 al, dl

        $sequence_5 = { 49 3bd1 72e0 b90a000000 33c0 8d7c2438 }
            // n = 6, score = 200
            //   49                   | dec                 ecx
            //   3bd1                 | cmp                 edx, ecx
            //   72e0                 | jb                  0xffffffe2
            //   b90a000000           | mov                 ecx, 0xa
            //   33c0                 | xor                 eax, eax
            //   8d7c2438             | lea                 edi, [esp + 0x38]

        $sequence_6 = { 68???????? 51 e8???????? 83c408 8944240c }
            // n = 5, score = 200
            //   68????????           |                     
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8944240c             | mov                 dword ptr [esp + 0xc], eax

        $sequence_7 = { 52 e8???????? 8d0476 83c408 }
            // n = 4, score = 200
            //   52                   | push                edx
            //   e8????????           |                     
            //   8d0476               | lea                 eax, [esi + esi*2]
            //   83c408               | add                 esp, 8

        $sequence_8 = { 7526 8b35???????? 53 ffd6 55 ffd6 8b4c2420 }
            // n = 7, score = 200
            //   7526                 | jne                 0x28
            //   8b35????????         |                     
            //   53                   | push                ebx
            //   ffd6                 | call                esi
            //   55                   | push                ebp
            //   ffd6                 | call                esi
            //   8b4c2420             | mov                 ecx, dword ptr [esp + 0x20]

        $sequence_9 = { 7504 88442419 fec0 47 3c40 72f1 8a543102 }
            // n = 7, score = 200
            //   7504                 | jne                 6
            //   88442419             | mov                 byte ptr [esp + 0x19], al
            //   fec0                 | inc                 al
            //   47                   | inc                 edi
            //   3c40                 | cmp                 al, 0x40
            //   72f1                 | jb                  0xfffffff3
            //   8a543102             | mov                 dl, byte ptr [ecx + esi + 2]

    condition:
        7 of them and filesize < 131072
}
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