SYMBOLCOMMON_NAMEaka. SYNONYMS
win.crosswalk (Back to overview)

CROSSWALK

aka: ProxIP, Motnug, TOMMYGUN

Actor(s): APT41


According to FireEye, CROSSWALK is a skeletal, modular backdoor capable of system survey and adding modules in response to C&C replies.

References
2021-09-09SymantecThreat Hunter Team
@online{team:20210909:grayfly:60c5478, author = {Threat Hunter Team}, title = {{Grayfly: Chinese Threat Actor Uses Newly-discovered Sidewalk Malware}}, date = {2021-09-09}, organization = {Symantec}, url = {https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/grayfly-china-sidewalk-malware}, language = {English}, urldate = {2021-09-10} } Grayfly: Chinese Threat Actor Uses Newly-discovered Sidewalk Malware
CROSSWALK MimiKatz SideWalk
2021-08-24ESET ResearchThibaut Passilly, Mathieu Tartare
@online{passilly:20210824:sidewalk:75d39db, author = {Thibaut Passilly and Mathieu Tartare}, title = {{The SideWalk may be as dangerous as the CROSSWALK}}, date = {2021-08-24}, organization = {ESET Research}, url = {https://www.welivesecurity.com/2021/08/24/sidewalk-may-be-as-dangerous-as-crosswalk/}, language = {English}, urldate = {2021-08-31} } The SideWalk may be as dangerous as the CROSSWALK
Cobalt Strike CROSSWALK SideWalk
2021-01-15The Hacker NewsRavie Lakshmaman
@online{lakshmaman:20210115:researchers:d524572, author = {Ravie Lakshmaman}, title = {{Researchers Disclose Undocumented Chinese Malware Used in Recent Attacks}}, date = {2021-01-15}, organization = {The Hacker News}, url = {https://thehackernews.com/2021/01/researchers-disclose-undocumented.html}, language = {English}, urldate = {2021-06-29} } Researchers Disclose Undocumented Chinese Malware Used in Recent Attacks
CROSSWALK
2021-01-14PTSecurityPT ESC Threat Intelligence
@online{intelligence:20210114:higaisa:4676ec7, author = {PT ESC Threat Intelligence}, title = {{Higaisa or Winnti? APT41 backdoors, old and new}}, date = {2021-01-14}, organization = {PTSecurity}, url = {https://www.ptsecurity.com/ww-en/analytics/pt-esc-threat-intelligence/higaisa-or-winnti-apt-41-backdoors-old-and-new/}, language = {English}, urldate = {2021-02-09} } Higaisa or Winnti? APT41 backdoors, old and new
Cobalt Strike CROSSWALK FunnySwitch PlugX ShadowPad
2020-11-13Youtube (The Standoff)Alexey Zakharov, Positive Technologies
@online{zakharov:20201113:ff202eng:1d1222c, author = {Alexey Zakharov and Positive Technologies}, title = {{FF_202_Eng - From old Higaisa samples to new Winnti backdoors: The story of one research}}, date = {2020-11-13}, organization = {Youtube (The Standoff)}, url = {https://www.youtube.com/watch?v=8x-pGlWpIYI}, language = {English}, urldate = {2020-11-23} } FF_202_Eng - From old Higaisa samples to new Winnti backdoors: The story of one research
CROSSWALK Unidentified 076 (Higaisa LNK to Shellcode)
2020-11-03Kaspersky LabsGReAT
@online{great:20201103:trends:febc159, author = {GReAT}, title = {{APT trends report Q3 2020}}, date = {2020-11-03}, organization = {Kaspersky Labs}, url = {https://securelist.com/apt-trends-report-q3-2020/99204/}, language = {English}, urldate = {2020-11-04} } APT trends report Q3 2020
WellMail EVILNUM Janicab Poet RAT AsyncRAT Ave Maria Cobalt Strike Crimson RAT CROSSWALK Dtrack LODEINFO MoriAgent Okrum PlugX poisonplug Rover ShadowPad SoreFang Winnti
2020-09-18SymantecThreat Hunter Team
@online{team:20200918:apt41:363daa8, author = {Threat Hunter Team}, title = {{APT41: Indictments Put Chinese Espionage Group in the Spotlight}}, date = {2020-09-18}, organization = {Symantec}, url = {https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/apt41-indictments-china-espionage}, language = {English}, urldate = {2020-09-23} } APT41: Indictments Put Chinese Espionage Group in the Spotlight
CROSSWALK PlugX poisonplug ShadowPad Winnti
2020-07-29ESET Researchwelivesecurity
@techreport{welivesecurity:20200729:threat:496355c, author = {welivesecurity}, title = {{THREAT REPORT Q2 2020}}, date = {2020-07-29}, institution = {ESET Research}, url = {https://www.welivesecurity.com/wp-content/uploads/2020/07/ESET_Threat_Report_Q22020.pdf}, language = {English}, urldate = {2020-07-30} } THREAT REPORT Q2 2020
DEFENSOR ID HiddenAd Bundlore Pirrit Agent.BTZ Cerber ClipBanker CROSSWALK Cryptowall CTB Locker DanaBot Dharma Formbook Gandcrab Grandoreiro Houdini ISFB LockBit Locky Mailto Maze Microcin Nemty NjRAT Phobos PlugX Pony REvil Socelars STOP Tinba TrickBot WannaCryptor
2020-07-21YouTube ( OPCDE with Matt Suiche)Mohamad Mokbel
@online{mokbel:20200721:vopcde:26d48d0, author = {Mohamad Mokbel}, title = {{vOPCDE #9 - A Journey into Malware HTTP Communication Channels Spectacles (Mohamad Mokbel)}}, date = {2020-07-21}, organization = {YouTube ( OPCDE with Matt Suiche)}, url = {https://www.youtube.com/watch?v=FttiysUZmDw}, language = {English}, urldate = {2021-09-22} } vOPCDE #9 - A Journey into Malware HTTP Communication Channels Spectacles (Mohamad Mokbel)
Alureon Cobra Carbon System CROSSWALK danbot Mevade ProtonBot Silence
2019-09-30vmwareScott Knight
@online{knight:20190930:cb:a21cf30, author = {Scott Knight}, title = {{CB Threat Analysis Unit: Technical Analysis of “Crosswalk”}}, date = {2019-09-30}, organization = {vmware}, url = {https://www.carbonblack.com/2019/09/30/cb-threat-analysis-unit-technical-analysis-of-crosswalk/}, language = {English}, urldate = {2020-04-21} } CB Threat Analysis Unit: Technical Analysis of “Crosswalk”
CROSSWALK
2019-08-09FireEyeFireEye
@online{fireeye:20190809:double:40f736e, author = {FireEye}, title = {{Double Dragon APT41, a dual espionage and cyber crime operation}}, date = {2019-08-09}, organization = {FireEye}, url = {https://content.fireeye.com/apt-41/rpt-apt41/}, language = {English}, urldate = {2019-12-18} } Double Dragon APT41, a dual espionage and cyber crime operation
CLASSFON crackshot CROSSWALK GEARSHIFT HIGHNOON HIGHNOON.BIN JUMPALL poisonplug Winnti
2018-12-24Twitter (@MrDanPerez)Dan Perez
@online{perez:20181224:hashes:9a4fc8c, author = {Dan Perez}, title = {{Tweet on hashes for CROSSWALK}}, date = {2018-12-24}, organization = {Twitter (@MrDanPerez)}, url = {https://twitter.com/MrDanPerez/status/1159459082534825986}, language = {English}, urldate = {2019-11-27} } Tweet on hashes for CROSSWALK
CROSSWALK
Yara Rules
[TLP:WHITE] win_crosswalk_auto (20211008 | Detects win.crosswalk.)
rule win_crosswalk_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        version = "1"
        description = "Detects win.crosswalk."
        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.crosswalk"
        malpedia_rule_date = "20211007"
        malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535"
        malpedia_version = "20211008"
        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 = { 33d2 488bc8 e8???????? 4533c9 4533c0 33d2 }
            // n = 6, score = 1300
            //   33d2                 | dec                 eax
            //   488bc8               | sub                 esp, 0x28
            //   e8????????           |                     
            //   4533c9               | dec                 eax
            //   4533c0               | test                ecx, ecx
            //   33d2                 | je                  7

        $sequence_1 = { 418bc0 f7e9 03d1 c1fa0b 8bc2 }
            // n = 5, score = 1300
            //   418bc0               | inc                 ecx
            //   f7e9                 | mov                 eax, eax
            //   03d1                 | imul                ecx
            //   c1fa0b               | add                 edx, ecx
            //   8bc2                 | sar                 edx, 0xb

        $sequence_2 = { c1fa0b 8bc2 c1e81f 03d0 69c2890e0000 3bc8 }
            // n = 6, score = 1300
            //   c1fa0b               | imul                ecx
            //   8bc2                 | add                 edx, ecx
            //   c1e81f               | sar                 edx, 0xb
            //   03d0                 | mov                 eax, edx
            //   69c2890e0000         | shr                 eax, 0x1f
            //   3bc8                 | add                 edx, eax

        $sequence_3 = { ff15???????? 448bf0 4533c9 4533c0 }
            // n = 4, score = 1300
            //   ff15????????         |                     
            //   448bf0               | inc                 ecx
            //   4533c9               | movsx               eax, byte ptr [eax]
            //   4533c0               | dec                 ecx

        $sequence_4 = { 4c8bc6 33d2 410fbe00 49ffc0 d3ca 03d0 }
            // n = 6, score = 1300
            //   4c8bc6               | mov                 ecx, ebp
            //   33d2                 | dec                 esp
            //   410fbe00             | mov                 eax, esi
            //   49ffc0               | xor                 edx, edx
            //   d3ca                 | inc                 ecx
            //   03d0                 | movsx               eax, byte ptr [eax]

        $sequence_5 = { 4885c9 7402 ffd1 b801000000 }
            // n = 4, score = 1300
            //   4885c9               | dec                 ecx
            //   7402                 | inc                 eax
            //   ffd1                 | ror                 edx, cl
            //   b801000000           | add                 edx, eax

        $sequence_6 = { 33f6 8d6e20 8bcd e8???????? }
            // n = 4, score = 1300
            //   33f6                 | mov                 eax, edx
            //   8d6e20               | xor                 esi, esi
            //   8bcd                 | lea                 ebp, dword ptr [esi + 0x20]
            //   e8????????           |                     

        $sequence_7 = { d3ca 03d0 4183ef01 75ef }
            // n = 4, score = 1300
            //   d3ca                 | sar                 edx, 0xb
            //   03d0                 | mov                 eax, edx
            //   4183ef01             | shr                 eax, 0x1f
            //   75ef                 | inc                 ecx

        $sequence_8 = { 58 6bc000 c7803c88410002000000 6a04 58 6bc000 8b0d???????? }
            // n = 7, score = 200
            //   58                   | shr                 eax, 0x1f
            //   6bc000               | add                 edx, eax
            //   c7803c88410002000000     | imul    eax, edx, 0xe89
            //   6a04                 | cmp                 ecx, eax
            //   58                   | xor                 edx, edx
            //   6bc000               | inc                 ecx
            //   8b0d????????         |                     

        $sequence_9 = { 2bf8 ff15???????? 6a00 6a00 57 }
            // n = 5, score = 200
            //   2bf8                 | movsx               eax, byte ptr [eax]
            //   ff15????????         |                     
            //   6a00                 | dec                 ecx
            //   6a00                 | inc                 eax
            //   57                   | ror                 edx, cl

        $sequence_10 = { 1bc0 23c1 eb57 53 8b1c85b81d4100 56 6800080000 }
            // n = 7, score = 200
            //   1bc0                 | sub                 edi, 1
            //   23c1                 | dec                 esp
            //   eb57                 | mov                 eax, esi
            //   53                   | xor                 edx, edx
            //   8b1c85b81d4100       | inc                 ecx
            //   56                   | movsx               eax, byte ptr [eax]
            //   6800080000           | dec                 ecx

        $sequence_11 = { 8d8008824100 8945e4 803800 8bc8 }
            // n = 4, score = 200
            //   8d8008824100         | and                 dword ptr [esp + 0x20], esi
            //   8945e4               | inc                 ebp
            //   803800               | mov                 eax, esi
            //   8bc8                 | xor                 edx, edx

        $sequence_12 = { 8d3c85a88d4100 8b0f 85c9 740b 8d4101 f7d8 1bc0 }
            // n = 7, score = 200
            //   8d3c85a88d4100       | dec                 eax
            //   8b0f                 | mov                 ecx, eax
            //   85c9                 | inc                 ebp
            //   740b                 | xor                 ecx, ecx
            //   8d4101               | add                 edx, ecx
            //   f7d8                 | sar                 edx, 0xb
            //   1bc0                 | mov                 eax, edx

        $sequence_13 = { c1ff06 6bf630 8b04bd808e4100 f644302880 741f }
            // n = 5, score = 200
            //   c1ff06               | inc                 eax
            //   6bf630               | dec                 esp
            //   8b04bd808e4100       | mov                 eax, esi
            //   f644302880           | xor                 edx, edx
            //   741f                 | inc                 ecx

        $sequence_14 = { 6a00 ffd3 8bf0 6aff 56 ff15???????? 56 }
            // n = 7, score = 200
            //   6a00                 | movsx               eax, byte ptr [eax]
            //   ffd3                 | dec                 ecx
            //   8bf0                 | inc                 eax
            //   6aff                 | ror                 edx, cl
            //   56                   | add                 edx, eax
            //   ff15????????         |                     
            //   56                   | inc                 ecx

        $sequence_15 = { 83e908 8d7608 660fd60f 8d7f08 8b048d34024100 ffe0 }
            // n = 6, score = 200
            //   83e908               | add                 edx, eax
            //   8d7608               | inc                 ecx
            //   660fd60f             | sub                 edi, 1
            //   8d7f08               | sar                 edx, 0xb
            //   8b048d34024100       | mov                 eax, edx
            //   ffe0                 | shr                 eax, 0x1f

    condition:
        7 of them and filesize < 286720
}
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