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
behavioral2/files/0x000e00000001b87d-4.dat	family_juko
behavioral2/files/0x000f00000001c53a-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1856	WINWORD.exe
3684	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-1-5-21-3797332335-34111092-3597280141-1000\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
5576	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	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	2026-08-09_3ff9f9284020d4568442c65e05be366f_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
5576	cmd.exe
3020	PING.EXE
848	PING.EXE
5188	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3020	PING.EXE
848	PING.EXE
5188	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5780 wrote to memory of 1856	5780	2026-08-09_3ff9f9284020d4568442c65e05be366f_elex_wannacry.exe	89
PID 1856 wrote to memory of 5576	1856	WINWORD.exe	90
PID 5576 wrote to memory of 3020	5576	cmd.exe	92
PID 5576 wrote to memory of 848	5576	cmd.exe	93
PID 5576 wrote to memory of 5188	5576	cmd.exe	94
PID 5576 wrote to memory of 3684	5576	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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5780
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1856
- - 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\000037ED" 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:5576
  - - 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:3020
  - - 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:848
  - - 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:5188
  - - 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:3684

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

000037ED

Path C:\Users\Admin\AppData\Roaming\Mozilla\000037ED
Size 40KB
SHA256 c45e9bb15ae3d82b3a907644d6cbf2cb964bf00eb94036e09d351e00954a166d
MD5 9b918467496ca4f034cb136aaa68d52f
SHA1 f468e534c904535aedf7e9c11bbdef598a8736ff
SHA512 22592389590beb24e0764bd4ff612fe11619234fa4a582b51a8576faa838eb7b18fece768762ca14d0726ef8ea895322cb0b7c237baecf1fd180ef02745117de
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7toa:rLsF2Kerc64sTiX2IV0DRGa
TLSH
T10B032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF75ECE
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