juko | 3f15fb3b8d746acb7b3b3049123cab867809d6fa803a5bb77d14747cece3c6c3

General

Target
2026-05-11_7f8802dca81104ae28d40dbaa3485681_elex_wannacry.exe
Size 47KB
Sample260511-syf2vadv4y
SHA256 3f15fb3b8d746acb7b3b3049123cab867809d6fa803a5bb77d14747cece3c6c3
MD5 7f8802dca81104ae28d40dbaa3485681
SHA1 c57db86980cdbf0d63ce5795bacfcabcbe40e96f
SHA512 9a168607f1e43dbe45ec3417323a9c9faf3e32ab093fa67ce0daa0a441dfa5cfe89c44711091f78776b2283528c153b70bcded46f9bc486f9e40ec516febca74
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJN:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxv
TLSH
T111235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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 2 IoCs

resource	yara_rule
behavioral1/files/0x00060000000229b1-4.dat	family_juko
behavioral1/files/0x00080000000242aa-12.dat	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-1-5-21-636600838-1632888396-3521553955-1000\Control Panel\International\Geo\Nation	2026-05-11_7f8802dca81104ae28d40dbaa3485681_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-636600838-1632888396-3521553955-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2400	WINWORD.exe
4604	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-1-5-21-636600838-1632888396-3521553955-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-11_7f8802dca81104ae28d40dbaa3485681_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

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
884	PING.EXE
3476	PING.EXE
5640	PING.EXE
5736	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
884	PING.EXE
3476	PING.EXE
5640	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3692 wrote to memory of 2400	3692	2026-05-11_7f8802dca81104ae28d40dbaa3485681_elex_wannacry.exe	85
PID 2400 wrote to memory of 5736	2400	WINWORD.exe	86
PID 5736 wrote to memory of 884	5736	cmd.exe	88
PID 5736 wrote to memory of 3476	5736	cmd.exe	89
PID 5736 wrote to memory of 5640	5736	cmd.exe	90
PID 5736 wrote to memory of 4604	5736	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-11_7f8802dca81104ae28d40dbaa3485681_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-11_7f8802dca81104ae28d40dbaa3485681_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3692
- 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:2400
- - 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\000021E0" 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:5736
  - - 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:884
  - - 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:3476
  - - 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:5640
  - - 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:4604

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

000021E0

Path C:\Users\Admin\AppData\Roaming\Mozilla\000021E0
Size 47KB
SHA256 81c931b433bf49a6317fd873dc036164e8f5e2c251cc9626264c14323403923b
MD5 1e68fcba0986b9e106dddabbee3b13e5
SHA1 551b2154cbbd819d074c141a831567bbd3dbe015
SHA512 cde5243a3ec3a962254969b52b0d6ae130d4399440c103385c39ad5f6123543b51de408f7f9ebcc7283c0eba8510a999202647313640d8476e07fa6ed94daf93
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJU:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxq
TLSH
T1CC235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 3f15fb3b8d746acb7b3b3049123cab867809d6fa803a5bb77d14747cece3c6c3
MD5 7f8802dca81104ae28d40dbaa3485681
SHA1 c57db86980cdbf0d63ce5795bacfcabcbe40e96f
SHA512 9a168607f1e43dbe45ec3417323a9c9faf3e32ab093fa67ce0daa0a441dfa5cfe89c44711091f78776b2283528c153b70bcded46f9bc486f9e40ec516febca74
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJN:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxv
TLSH
T111235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads