juko | 564fd0bafca48eb112dc49ef7d878216a63ca7be55776f91ff22b477ea9990f5

General

Target
2026-05-05_42d56119157c2ccf8453a89e30b48383_elex_wannacry.exe
Size 30KB
Sample260505-jfl1psev8l
SHA256 564fd0bafca48eb112dc49ef7d878216a63ca7be55776f91ff22b477ea9990f5
MD5 42d56119157c2ccf8453a89e30b48383
SHA1 f9a31221c54a738ccbf4ea9e864fa863906aaba5
SHA512 d0aada727b209477c56dd50ddac32ef8e511459ac0bf36bf6f62c09054d701fbeec828968a97fc62786ca9e3052bc56aa28b74ea86879730d7d2a8b3173ef788
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrl:OLsF2Kerc64sTiX2IV0DkFMl
TLSH
T1F8E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400E4D3CF1D65DAB1E9E
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
behavioral1/files/0x000c00000001e6b9-4.dat	family_juko
behavioral1/files/0x000b0000000241a6-11.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-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	2026-05-05_42d56119157c2ccf8453a89e30b48383_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4024	WINWORD.exe
5652	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-1-5-21-312252282-3884318443-358092420-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-05_42d56119157c2ccf8453a89e30b48383_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

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
1840	PING.EXE
2976	PING.EXE
392	cmd.exe
3712	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3712	PING.EXE
1840	PING.EXE
2976	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4532 wrote to memory of 4024	4532	2026-05-05_42d56119157c2ccf8453a89e30b48383_elex_wannacry.exe	85
PID 4024 wrote to memory of 392	4024	WINWORD.exe	86
PID 392 wrote to memory of 3712	392	cmd.exe	88
PID 392 wrote to memory of 1840	392	cmd.exe	89
PID 392 wrote to memory of 2976	392	cmd.exe	90
PID 392 wrote to memory of 5652	392	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-05_42d56119157c2ccf8453a89e30b48383_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_42d56119157c2ccf8453a89e30b48383_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4532
- 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:4024
- - 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\00007F2A" 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:392
  - - 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:3712
  - - 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:1840
  - - 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:2976
  - - 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:5652

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

00007F2A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007F2A
Size 30KB
SHA256 ba338f63bc01d88307f1a8a9c6745171f021e41395dd21eb9125c888f3dcc0ef
MD5 fd947c6afb0028b6383198d47959c5bf
SHA1 7304d2d37f6463285f2a1b3263aa138b2ed1a5e1
SHA512 d1533ac6eebe97c9c43640f5cb63e7dcf02d2cf03b9dec409e7dce21f610890afaca73965d06a7afeb8e30d37c9d9933b7196b471e0a51d9716cb0fbd69ff438
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHr6:OLsF2Kerc64sTiX2IV0DkFM6
TLSH
T147E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 564fd0bafca48eb112dc49ef7d878216a63ca7be55776f91ff22b477ea9990f5
MD5 42d56119157c2ccf8453a89e30b48383
SHA1 f9a31221c54a738ccbf4ea9e864fa863906aaba5
SHA512 d0aada727b209477c56dd50ddac32ef8e511459ac0bf36bf6f62c09054d701fbeec828968a97fc62786ca9e3052bc56aa28b74ea86879730d7d2a8b3173ef788
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrl:OLsF2Kerc64sTiX2IV0DkFMl
TLSH
T1F8E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400E4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4024-10-0x00000000008D0000-0x00000000009F0000-memory.dmp

Download

memory/4532-8-0x0000000000720000-0x0000000000840000-memory.dmp

Download

memory/5652-13-0x0000000000860000-0x0000000000980000-memory.dmp

Download

memory/5652-16-0x0000000000860000-0x0000000000980000-memory.dmp

Download

memory/5652-25-0x0000000000860000-0x0000000000980000-memory.dmp

Download

memory/5652-26-0x0000000000860000-0x0000000000980000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads