juko | 47b6471dd7c9a6a9f14829daa5a782200ad5b7fed59e25acb48e1d91c43c6dd5

General

Target
2026-06-26_8ef5e5dc299c7426ce196943247cb264_elex_wannacry.exe
Size 49KB
Sample260629-rd2mdagy7p
SHA256 47b6471dd7c9a6a9f14829daa5a782200ad5b7fed59e25acb48e1d91c43c6dd5
MD5 8ef5e5dc299c7426ce196943247cb264
SHA1 82c8f53531d8e86aedffbe1cdcff96b5812cdf71
SHA512 cbf80fcfc225447df7283c5235189ba05510fa046cb2a6a4f86effa5da23d04c0f11b1727f9ed7e2695dbfa2710f804f5a7cc710c74161b05604d6538d748b46
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2P:VLy2Kerc64CiGImVucp4kojWh2P
TLSH
T117334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/3568-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024466-5.dat	family_juko
behavioral1/memory/3568-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2292-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0008000000024467-15.dat	family_juko
behavioral1/memory/4216-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4216-18-0x0000000000400000-0x0000000000420000-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-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	2026-06-26_8ef5e5dc299c7426ce196943247cb264_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2292	WINWORD.exe
4216	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-1-5-21-876885714-46325919-1482798410-1000\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	2026-06-26_8ef5e5dc299c7426ce196943247cb264_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
4068	PING.EXE
4132	cmd.exe
1888	PING.EXE
3000	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4068	PING.EXE
1888	PING.EXE
3000	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3568 wrote to memory of 2292	3568	2026-06-26_8ef5e5dc299c7426ce196943247cb264_elex_wannacry.exe	86
PID 2292 wrote to memory of 4132	2292	WINWORD.exe	87
PID 4132 wrote to memory of 4068	4132	cmd.exe	89
PID 4132 wrote to memory of 1888	4132	cmd.exe	90
PID 4132 wrote to memory of 3000	4132	cmd.exe	91
PID 4132 wrote to memory of 4216	4132	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-06-26_8ef5e5dc299c7426ce196943247cb264_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-26_8ef5e5dc299c7426ce196943247cb264_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3568
- 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:2292
- - 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\00000718" 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:4132
  - - 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:4068
  - - 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:1888
  - - 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:3000
  - - 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:4216

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

00000718

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000718
Size 49KB
SHA256 518570f2402d2466275677bfe42f34cc77e14aa42b535b88e8c52e1b257de817
MD5 8aabef0ad1dcd916a4dc62b013481c70
SHA1 e66e19fb228577d3a7b31ab3d76a3dc359b89565
SHA512 85d17191bce34b2df11bdae0d9a31ec69b9486688b08800f955c4a397710f8ab1b4bebc4b68ca5bf252e9bb1d9bf1f966bb2d28b3a017af70202e5a50eaaa390
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2G:VLy2Kerc64CiGImVucp4kojWh2G
TLSH
T141334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 47b6471dd7c9a6a9f14829daa5a782200ad5b7fed59e25acb48e1d91c43c6dd5
MD5 8ef5e5dc299c7426ce196943247cb264
SHA1 82c8f53531d8e86aedffbe1cdcff96b5812cdf71
SHA512 cbf80fcfc225447df7283c5235189ba05510fa046cb2a6a4f86effa5da23d04c0f11b1727f9ed7e2695dbfa2710f804f5a7cc710c74161b05604d6538d748b46
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2P:VLy2Kerc64CiGImVucp4kojWh2P
TLSH
T117334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2292-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3568-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3568-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4216-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4216-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads