juko | 0df92c5373baf3890137780674486d11980f21c24f9b7a7d45f588d4b0c57c7a

Analysis

max time kernel
149s
max time network
142s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
20/04/2026, 05:39

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General

Target
2026-04-20_38defe02c8e21614e4c77e73c66be299_elex_wannacry.exe
Size 39KB
Sample260420-gcbdpad13x
SHA256 0df92c5373baf3890137780674486d11980f21c24f9b7a7d45f588d4b0c57c7a
MD5 38defe02c8e21614e4c77e73c66be299
SHA1 9dd9b13e1f4b5906ba4a69c8ac4889d8fa4ce836
SHA512 976462bb2ee95afbe0f5d92995d9beaac83a85a2fb02ecd6fa21c3697da7109537f1203ac231f43a20aaaae5104a62dff15a1a3b0b149739b52a652902f0ca0f
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBe:aLsF2Kerc64sTiX2IV0DVyIGFR
TLSH
T1FD036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/4588-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000800000000d3f6-5.dat	family_juko
behavioral2/memory/4588-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4968-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b42d-17.dat	family_juko
behavioral2/memory/2680-19-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2680-20-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4968	WINWORD.exe
2680	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3119821332-640943685-2562343641-1000\Software\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-20_38defe02c8e21614e4c77e73c66be299_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
788	cmd.exe
3076	PING.EXE
752	PING.EXE
4616	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4616	PING.EXE
3076	PING.EXE
752	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4588 wrote to memory of 4968	4588	2026-04-20_38defe02c8e21614e4c77e73c66be299_elex_wannacry.exe	79
PID 4968 wrote to memory of 788	4968	WINWORD.exe	80
PID 788 wrote to memory of 3076	788	cmd.exe	82
PID 788 wrote to memory of 752	788	cmd.exe	83
PID 788 wrote to memory of 4616	788	cmd.exe	84
PID 788 wrote to memory of 2680	788	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-20_38defe02c8e21614e4c77e73c66be299_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-20_38defe02c8e21614e4c77e73c66be299_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4588
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4968
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\0000465C" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:788
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3076
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:752
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4616
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:2680

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0000465C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000465C
Size 39KB
SHA256 8516e9bc2c90b567b6720f172fa5378a5c578aa64a3812ce245f756162b5f67c
MD5 36ead8fc13347d920428de9c4836342e
SHA1 afe171d5df41dcb86085f168e15d4a7509aa9709
SHA512 3bec4fda78a6546acf7e7fd3438c8b1be5f054cd93456dc73b59fc0e7317c90998ebbf8d7f6069203a6c64294d69b89358a9d656020f56e5191b82580ac520d7
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB2:aLsF2Kerc64sTiX2IV0DVyIGFJ
TLSH
T13B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 0df92c5373baf3890137780674486d11980f21c24f9b7a7d45f588d4b0c57c7a
MD5 38defe02c8e21614e4c77e73c66be299
SHA1 9dd9b13e1f4b5906ba4a69c8ac4889d8fa4ce836
SHA512 976462bb2ee95afbe0f5d92995d9beaac83a85a2fb02ecd6fa21c3697da7109537f1203ac231f43a20aaaae5104a62dff15a1a3b0b149739b52a652902f0ca0f
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBe:aLsF2Kerc64sTiX2IV0DVyIGFR
TLSH
T1FD036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2680-19-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2680-20-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4588-0-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4588-13-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4588-12-0x0000000002620000-0x000000000276D000-memory.dmp

Download

memory/4968-16-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4968-15-0x00000000025F0000-0x000000000273D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads