juko | 432990ae46b68d621b74e44a4b1b9f12e8af917306900959c25a113cf3a903f3

General

Target
2026-07-30_cad49a8d272d10ea332b35b010d7b398_elex_wannacry.exe
Size 37KB
Sample260730-jk423ser41
SHA256 432990ae46b68d621b74e44a4b1b9f12e8af917306900959c25a113cf3a903f3
MD5 cad49a8d272d10ea332b35b010d7b398
SHA1 4d850bbb7f9a19358955e216073ea83b54f4f915
SHA512 e4d3b85389b32de07cd96f79298f76ea2018ae18a51e2ba399283ebe432a06b59731bb28eeb73c1f6f8c0f07a0ce59492eebc5bbc7bf402e12b1f5824ce650e1
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaI:3LsF2Kerc64sTiX2IV0Dhuogwb
TLSH
T126035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

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

Detects Juko 8 IoCs

resource	yara_rule
behavioral1/memory/3460-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0005000000023252-5.dat	family_juko
behavioral1/memory/1400-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/3460-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1400-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00090000000244a3-16.dat	family_juko
behavioral1/memory/744-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/744-19-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-07-30_cad49a8d272d10ea332b35b010d7b398_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1400	WINWORD.exe
744	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-1-5-21-668679576-120646659-2289335452-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4748	cmd.exe

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	2026-07-30_cad49a8d272d10ea332b35b010d7b398_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
3332	PING.EXE
2872	PING.EXE
4976	PING.EXE
4748	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4976	PING.EXE
3332	PING.EXE
2872	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3460 wrote to memory of 1400	3460	2026-07-30_cad49a8d272d10ea332b35b010d7b398_elex_wannacry.exe	88
PID 1400 wrote to memory of 4748	1400	WINWORD.exe	89
PID 4748 wrote to memory of 3332	4748	cmd.exe	91
PID 4748 wrote to memory of 2872	4748	cmd.exe	92
PID 4748 wrote to memory of 4976	4748	cmd.exe	93
PID 4748 wrote to memory of 744	4748	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-30_cad49a8d272d10ea332b35b010d7b398_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_cad49a8d272d10ea332b35b010d7b398_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3460
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1400
- - 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\00003B3A" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4748
  - - 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:3332
  - - 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:2872
  - - 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:4976
  - - 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:744

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00003B3A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003B3A
Size 37KB
SHA256 8b793f8f815fe327787ba5f3179fdc6e6e0309fe54d503440b2111c2462676e1
MD5 82e88ab38d80df7f25c13ee8fe3ba867
SHA1 7327bfb0bea903140a4aa165eef1d706678c51f9
SHA512 cae53555aaab7a20516b70f2e153d876585f286b3e18b61ea3e0d40e71eab3abfe368746410610ead5d982ec3023ceb99459988ea4e244b8defd4806e0a5b75f
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5yway:3LsF2Kerc64sTiX2IV0DhuogwF
TLSH
T1F1034C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 432990ae46b68d621b74e44a4b1b9f12e8af917306900959c25a113cf3a903f3
MD5 cad49a8d272d10ea332b35b010d7b398
SHA1 4d850bbb7f9a19358955e216073ea83b54f4f915
SHA512 e4d3b85389b32de07cd96f79298f76ea2018ae18a51e2ba399283ebe432a06b59731bb28eeb73c1f6f8c0f07a0ce59492eebc5bbc7bf402e12b1f5824ce650e1
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaI:3LsF2Kerc64sTiX2IV0Dhuogwb
TLSH
T126035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/744-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/744-19-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1400-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1400-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3460-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3460-13-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads