juko | 7792c057474d8e9472b9767754e005cf8d74d159df69ea5d962eaa4597bf3144

General

Target
2026-08-09_3ff9f9284020d4568442c65e05be366f_elex_wannacry.exe
Size 40KB
Sample260809-31399sda53
SHA256 7792c057474d8e9472b9767754e005cf8d74d159df69ea5d962eaa4597bf3144
MD5 3ff9f9284020d4568442c65e05be366f
SHA1 b15e433316894929a5fb82b0877ace17f81d15e6
SHA512 7496869db14a0fcd53679972d936a399589bae8cc70b88b4c2332d4eaeb4a5760749edf3111c71889209edc5db472420e7ca418fa6bda4cc9d4f195f567a4f41
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7to7:rLsF2Kerc64sTiX2IV0DRG7
TLSH
T13C032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF75ECE
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 2 IoCs

resource	yara_rule
behavioral1/files/0x00180000000243b5-4.dat	family_juko
behavioral1/files/0x000900000002442e-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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-08-09_3ff9f9284020d4568442c65e05be366f_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4072	WINWORD.exe
4752	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
4564	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	2026-08-09_3ff9f9284020d4568442c65e05be366f_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
4868	PING.EXE
4600	PING.EXE
3648	PING.EXE
4564	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4868	PING.EXE
4600	PING.EXE
3648	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1908 wrote to memory of 4072	1908	2026-08-09_3ff9f9284020d4568442c65e05be366f_elex_wannacry.exe	85
PID 4072 wrote to memory of 4564	4072	WINWORD.exe	86
PID 4564 wrote to memory of 4868	4564	cmd.exe	88
PID 4564 wrote to memory of 4600	4564	cmd.exe	91
PID 4564 wrote to memory of 3648	4564	cmd.exe	94
PID 4564 wrote to memory of 4752	4564	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_3ff9f9284020d4568442c65e05be366f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_3ff9f9284020d4568442c65e05be366f_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1908
- 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:4072
- - 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\000013E5" 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:4564
  - - 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:4868
  - - 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:4600
  - - 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:3648
  - - 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:4752

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

000013E5

Path C:\Users\Admin\AppData\Roaming\Mozilla\000013E5
Size 40KB
SHA256 b518e541afaf2eaaffcc347bf60e3ffd713c8a449791dc83010da252de487bdb
MD5 d299e74468849ea6110e8269b7ab3ae2
SHA1 63a9217252b8ea0199dfe51bc8ea8e00d8230c89
SHA512 f98bd7245f7a59ed3a1a5f5ca5f1c62fb91ea9ad09fdf9f2ae2772dfd1e3d47749eb5fb4203cf2b4ccec70f99d04a362ac374f568ada3cf11aa41f1495cfa1e0
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7tox:rLsF2Kerc64sTiX2IV0DRGx
TLSH
T1FF032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF75ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 40KB
SHA256 7792c057474d8e9472b9767754e005cf8d74d159df69ea5d962eaa4597bf3144
MD5 3ff9f9284020d4568442c65e05be366f
SHA1 b15e433316894929a5fb82b0877ace17f81d15e6
SHA512 7496869db14a0fcd53679972d936a399589bae8cc70b88b4c2332d4eaeb4a5760749edf3111c71889209edc5db472420e7ca418fa6bda4cc9d4f195f567a4f41
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7to7:rLsF2Kerc64sTiX2IV0DRG7
TLSH
T13C032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF75ECE
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