juko | d9460aaf663e338c50d317558e6e23a8f3b61ee61c7b55e521af3c6a320a0aec

General

Target
2026-05-03_6322da417b7ace41e76e9331f719a04f_elex_wannacry.exe
Size 61KB
Sample260503-sd6f1abx5w
SHA256 d9460aaf663e338c50d317558e6e23a8f3b61ee61c7b55e521af3c6a320a0aec
MD5 6322da417b7ace41e76e9331f719a04f
SHA1 ab1acdaeb7b227688b4341088c6c30cf86c632ca
SHA512 c4acff196590e0733dfdc0dfe958f81c2b1ce6eb8473f4d84d64aba3de3fa4d2f41830af41897071dcac2bb8d141bd22da0f23e0432cbce5fefac62e29e41407
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQO:yLy2Kerc64CiGImVZuyp8Tl
TLSH
T13E532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
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/4736-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x000b00000002166e-5.dat	family_juko
behavioral1/memory/4736-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/1544-14-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x0004000000023198-15.dat	family_juko
behavioral1/memory/5972-17-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/5972-18-0x0000000000400000-0x0000000000422000-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-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	2026-05-03_6322da417b7ace41e76e9331f719a04f_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1544	WINWORD.exe
5972	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-1-5-21-914486190-3969805341-592249730-1000\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	2026-05-03_6322da417b7ace41e76e9331f719a04f_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
4020	PING.EXE
1228	cmd.exe
2156	PING.EXE
2028	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4020	PING.EXE
2156	PING.EXE
2028	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4736 wrote to memory of 1544	4736	2026-05-03_6322da417b7ace41e76e9331f719a04f_elex_wannacry.exe	85
PID 1544 wrote to memory of 1228	1544	WINWORD.exe	86
PID 1228 wrote to memory of 2156	1228	cmd.exe	88
PID 1228 wrote to memory of 2028	1228	cmd.exe	90
PID 1228 wrote to memory of 4020	1228	cmd.exe	91
PID 1228 wrote to memory of 5972	1228	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-05-03_6322da417b7ace41e76e9331f719a04f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-03_6322da417b7ace41e76e9331f719a04f_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4736
- 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:1544
- - 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\000007F8" 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:1228
  - - 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:2156
  - - 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:2028
  - - 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:4020
  - - 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:5972

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

000007F8

Path C:\Users\Admin\AppData\Roaming\Mozilla\000007F8
Size 61KB
SHA256 cc5cd699e6065c8dd8a078d5c04bc13db7f4b08a22e932a76eac31f0adb34e52
MD5 7d384891a2c0be583ac92a438deaad96
SHA1 34246481b826f1ab83e56b7b5e088124de27041f
SHA512 38f03112c2392f6eb35481ca2a8d4203d6963d2cbe528e98b28ee838ba76c951e234a2440d8e71cf067bd26e188b095aaafc29dbb9f28866def4d2446bac96d5
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQC:yLy2Kerc64CiGImVZuyp8TN
TLSH
T133532C26B950B072D95220B06A6D6B36417A9DF10717A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 61KB
SHA256 d9460aaf663e338c50d317558e6e23a8f3b61ee61c7b55e521af3c6a320a0aec
MD5 6322da417b7ace41e76e9331f719a04f
SHA1 ab1acdaeb7b227688b4341088c6c30cf86c632ca
SHA512 c4acff196590e0733dfdc0dfe958f81c2b1ce6eb8473f4d84d64aba3de3fa4d2f41830af41897071dcac2bb8d141bd22da0f23e0432cbce5fefac62e29e41407
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQO:yLy2Kerc64CiGImVZuyp8Tl
TLSH
T13E532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1544-14-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4736-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4736-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5972-17-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5972-18-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads