juko | ba5706171e0adb60f636882cacebe3379c724939901374986e87a18163b10a6c

General

Target
2026-08-09_6e9d674562bd71a184a0f3222782e78e_elex_wannacry.exe
Size 87KB
Sample260809-ep8tlszelh
SHA256 ba5706171e0adb60f636882cacebe3379c724939901374986e87a18163b10a6c
MD5 6e9d674562bd71a184a0f3222782e78e
SHA1 c822b0407df7244d6bd50c7d6faeedbdeb70c56f
SHA512 4f03879319bfb42a9ee4bf437c5f2d73713c3167c18d6041699fcc6fba1e965f387745c85fa58a78bc3d6b8d8e47d6bd3e7c53d21d453dc423d30f78d2af6b4a
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpq:2Ly2Kerc64CiGIm1K851YO6EQkwpq
TLSH
T16093A1763A259190C48BD178E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
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/4704-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000e0000000217bd-5.dat	family_juko
behavioral1/memory/4808-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4704-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4808-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000400000001e699-16.dat	family_juko
behavioral1/memory/1676-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/1676-19-0x0000000000400000-0x0000000000425000-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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	2026-08-09_6e9d674562bd71a184a0f3222782e78e_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4808	WINWORD.exe
1676	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-1-5-21-2937465464-4167303362-2236413517-1000\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
1776	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	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	2026-08-09_6e9d674562bd71a184a0f3222782e78e_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

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
1332	PING.EXE
1776	cmd.exe
4804	PING.EXE
1036	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1036	PING.EXE
1332	PING.EXE
4804	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4704 wrote to memory of 4808	4704	2026-08-09_6e9d674562bd71a184a0f3222782e78e_elex_wannacry.exe	85
PID 4808 wrote to memory of 1776	4808	WINWORD.exe	86
PID 1776 wrote to memory of 4804	1776	cmd.exe	89
PID 1776 wrote to memory of 1036	1776	cmd.exe	90
PID 1776 wrote to memory of 1332	1776	cmd.exe	91
PID 1776 wrote to memory of 1676	1776	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-08-09_6e9d674562bd71a184a0f3222782e78e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_6e9d674562bd71a184a0f3222782e78e_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4704
- 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:4808
- - 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\0000301C" 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:1776
  - - 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:4804
  - - 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:1036
  - - 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:1332
  - - 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:1676

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

0000301C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000301C
Size 87KB
SHA256 bb4de1fdf29c9a06f4cf84c071cff746571a570d4e74fc9438ea2aca183ec42f
MD5 a4395dc6c6ed45c1b2401c85f1c1af99
SHA1 6557d30a2e563b1ea83e98a66d646ec64dc84806
SHA512 87ddec8f1b6d2c3b5c2b3f0aaa1333d2c5f8820d5b7b910ccb025840fc7ad00462fed5686e6c9181b28d63360e41d2f7e0a7d6f246878d2214550b1068dd5319
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpJ:2Ly2Kerc64CiGIm1K851YO6EQkwpJ
TLSH
T18C93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 ba5706171e0adb60f636882cacebe3379c724939901374986e87a18163b10a6c
MD5 6e9d674562bd71a184a0f3222782e78e
SHA1 c822b0407df7244d6bd50c7d6faeedbdeb70c56f
SHA512 4f03879319bfb42a9ee4bf437c5f2d73713c3167c18d6041699fcc6fba1e965f387745c85fa58a78bc3d6b8d8e47d6bd3e7c53d21d453dc423d30f78d2af6b4a
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpq:2Ly2Kerc64CiGIm1K851YO6EQkwpq
TLSH
T16093A1763A259190C48BD178E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1676-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1676-19-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4704-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4704-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4808-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4808-15-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads