juko | acf52875d7ae109484773ddbb131cfee8ba85bc4a0392c12442a046a6adcbbb9

General

Target
2026-05-29_326b5e8e488f9aa0ee34bed8c651f8ad_elex_wannacry.exe
Size 49KB
Sample260529-g7a2eaet2z
SHA256 acf52875d7ae109484773ddbb131cfee8ba85bc4a0392c12442a046a6adcbbb9
MD5 326b5e8e488f9aa0ee34bed8c651f8ad
SHA1 d1e16acf5bc4cc278af03545579aba5abdee1600
SHA512 3ee5e818f7d44857c286b46966a323baa0c7fead206b905e8aba32950c19fab1d3962e67f67fbf710b2ed7420e0f41345b8e07102b8d7487928eb7a5c7c812b9
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h23:VLy2Kerc64CiGImVucp4kojWh23
TLSH
T1A8334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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
behavioral1/memory/2656-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024431-5.dat	family_juko
behavioral1/memory/2656-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2164-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0008000000024435-15.dat	family_juko
behavioral1/memory/2512-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2512-18-0x0000000000400000-0x0000000000420000-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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-05-29_326b5e8e488f9aa0ee34bed8c651f8ad_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2164	WINWORD.exe
2512	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-1-5-21-204488895-2999877624-296153668-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-29_326b5e8e488f9aa0ee34bed8c651f8ad_elex_wannacry.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
1552	cmd.exe
3912	PING.EXE
2284	PING.EXE
2924	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3912	PING.EXE
2284	PING.EXE
2924	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2656 wrote to memory of 2164	2656	2026-05-29_326b5e8e488f9aa0ee34bed8c651f8ad_elex_wannacry.exe	90
PID 2164 wrote to memory of 1552	2164	WINWORD.exe	91
PID 1552 wrote to memory of 3912	1552	cmd.exe	93
PID 1552 wrote to memory of 2284	1552	cmd.exe	94
PID 1552 wrote to memory of 2924	1552	cmd.exe	97
PID 1552 wrote to memory of 2512	1552	cmd.exe	100

C:\Users\Admin\AppData\Local\Temp\2026-05-29_326b5e8e488f9aa0ee34bed8c651f8ad_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-29_326b5e8e488f9aa0ee34bed8c651f8ad_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2656
- 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:2164
- - 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\000040FA" 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:1552
  - - 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:3912
  - - 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:2284
  - - 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:2924
  - - 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:2512

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

000040FA

Path C:\Users\Admin\AppData\Roaming\Mozilla\000040FA
Size 49KB
SHA256 63a5207e3d80dbafdd7548a986ad0c7bca4c5758e883c433875418ca0e55e458
MD5 994c8910f1383c28b6971060c755080f
SHA1 038847b0465e97230ffdcc14a87fc9ab1be772eb
SHA512 04fbda07d5d21cb8ac696d64f3cfc421050bf14b54597126d3cf4b59699dfffcf0487e6eb3514ef9172976663e7f1c2db4306ad48a4b5cdc6bf5527c22d52f3b
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2u:VLy2Kerc64CiGImVucp4kojWh2u
TLSH
T14F334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 acf52875d7ae109484773ddbb131cfee8ba85bc4a0392c12442a046a6adcbbb9
MD5 326b5e8e488f9aa0ee34bed8c651f8ad
SHA1 d1e16acf5bc4cc278af03545579aba5abdee1600
SHA512 3ee5e818f7d44857c286b46966a323baa0c7fead206b905e8aba32950c19fab1d3962e67f67fbf710b2ed7420e0f41345b8e07102b8d7487928eb7a5c7c812b9
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h23:VLy2Kerc64CiGImVucp4kojWh23
TLSH
T1A8334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2164-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2512-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2512-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2656-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2656-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads