juko | 72e4fc96485e8ade21a249f68202539953a3f5098ca4baba71763f924c2b74ec

General

Target
2026-04-20_521b055237432e04dfa48ac0fdaffbc7_elex_wannacry.exe
Size 30KB
Sample260420-p14zxaay3j
SHA256 72e4fc96485e8ade21a249f68202539953a3f5098ca4baba71763f924c2b74ec
MD5 521b055237432e04dfa48ac0fdaffbc7
SHA1 c26b9eb6abbb3c61b9dd8c9deb90955745d3de1f
SHA512 42ba6781cf89122ab089d0ee7391ce352901210a54e2189e7ab7c8362e98eadd8f22f7e7fa894c4ff0066b49257d6aea3043321cf6c4561332f468f865948394
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXi:tLsF2Kerc64sTiX2IV0Dzloi
TLSH
T1A1E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x001e00000002b1d4-4.dat	family_juko
behavioral2/files/0x001c00000002b371-11.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4084	WINWORD.exe
2992	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-1-5-21-2122505878-652277452-2375749442-1000\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	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	2026-04-20_521b055237432e04dfa48ac0fdaffbc7_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
3900	cmd.exe
2584	PING.EXE
5008	PING.EXE
2952	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2584	PING.EXE
5008	PING.EXE
2952	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4828 wrote to memory of 4084	4828	2026-04-20_521b055237432e04dfa48ac0fdaffbc7_elex_wannacry.exe	80
PID 4084 wrote to memory of 3900	4084	WINWORD.exe	81
PID 3900 wrote to memory of 2584	3900	cmd.exe	83
PID 3900 wrote to memory of 5008	3900	cmd.exe	84
PID 3900 wrote to memory of 2952	3900	cmd.exe	85
PID 3900 wrote to memory of 2992	3900	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-20_521b055237432e04dfa48ac0fdaffbc7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-20_521b055237432e04dfa48ac0fdaffbc7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4828
- 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:4084
- - 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\0000799E" 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:3900
  - - 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:2584
  - - 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:5008
  - - 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:2952
  - - 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:2992

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

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

0000799E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000799E
Size 30KB
SHA256 725b66bc37ca5477d999366ec1185d7015500f2e0b925194d6629cce6a82192b
MD5 458a2ac81a8b7556de31e1ac378be460
SHA1 faa69443db765ee6b1c4da15a1cda03cac68e164
SHA512 fb847639a7e4b41c7a84a9b7e69a463be4e44e882de8ebb3d5d844b64ca69d66354c8c30789460f42bfed07d368e9cd432d0dc806d8fd3e991530bde9e2f1cf1
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXF:tLsF2Kerc64sTiX2IV0DzloF
TLSH
T18EE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 72e4fc96485e8ade21a249f68202539953a3f5098ca4baba71763f924c2b74ec
MD5 521b055237432e04dfa48ac0fdaffbc7
SHA1 c26b9eb6abbb3c61b9dd8c9deb90955745d3de1f
SHA512 42ba6781cf89122ab089d0ee7391ce352901210a54e2189e7ab7c8362e98eadd8f22f7e7fa894c4ff0066b49257d6aea3043321cf6c4561332f468f865948394
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXi:tLsF2Kerc64sTiX2IV0Dzloi
TLSH
T1A1E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2992-13-0x0000000000980000-0x0000000000A5F000-memory.dmp

Download

memory/4084-10-0x0000000000980000-0x0000000000A5F000-memory.dmp

Download

memory/4828-7-0x0000000000990000-0x0000000000A6F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads