juko | 8110c5f38f7024a52b5d0afe335c74f0e9ecc2488065de811ae76e71914549e6

General

Target
2026-05-07_c3fb5035830af15c84fe4533fcbc92be_elex_wannacry.exe
Size 30KB
Sample260507-n1lynagy6m
SHA256 8110c5f38f7024a52b5d0afe335c74f0e9ecc2488065de811ae76e71914549e6
MD5 c3fb5035830af15c84fe4533fcbc92be
SHA1 9ca0a70141b9d9dfc5a2d304946d71e50225fc42
SHA512 7742d21ddda5cb9bb900cef002e0aab71cccb26d8a5173de5bd0ee08d5fa91d6297b67ce39e2595dcbf6a7c9d563a1a7aae90e5644ce65ccb76f92580fce045e
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXq:tLsF2Kerc64sTiX2IV0Dzloq
TLSH
T11EE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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/0x000a00000002355a-4.dat	family_juko
behavioral1/files/0x0008000000024474-11.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-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	2026-05-07_c3fb5035830af15c84fe4533fcbc92be_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4564	WINWORD.exe
4152	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-1-5-21-721190819-434563495-2007910846-1000\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	2026-05-07_c3fb5035830af15c84fe4533fcbc92be_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
5260	PING.EXE
5888	cmd.exe
4916	PING.EXE
4912	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4912	PING.EXE
5260	PING.EXE
4916	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4556 wrote to memory of 4564	4556	2026-05-07_c3fb5035830af15c84fe4533fcbc92be_elex_wannacry.exe	84
PID 4564 wrote to memory of 5888	4564	WINWORD.exe	85
PID 5888 wrote to memory of 4916	5888	cmd.exe	87
PID 5888 wrote to memory of 4912	5888	cmd.exe	88
PID 5888 wrote to memory of 5260	5888	cmd.exe	89
PID 5888 wrote to memory of 4152	5888	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-05-07_c3fb5035830af15c84fe4533fcbc92be_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-07_c3fb5035830af15c84fe4533fcbc92be_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4556
- 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:4564
- - 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\0000574D" 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:5888
  - - 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:4916
  - - 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:4912
  - - 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:5260
  - - 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:4152

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

0000574D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000574D
Size 30KB
SHA256 da774178d7516b74f18baf6ab12a7bfd78c24d450a4603b22f76e73192633183
MD5 2e0424eae081141b6ab5ffc9e7099f5a
SHA1 5ffc362f9cdc242f890e2b5f7e217fc63b2dfc0c
SHA512 ffa540ee112eb2467247659a1e2b33a8e12ec0fef8298f7ab3f0d432bf669a846719d218efc9ff25bb44d1094268037142c664cad9f5e398599f0aa7480b4b87
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXI:tLsF2Kerc64sTiX2IV0DzloI
TLSH
T1C4E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 8110c5f38f7024a52b5d0afe335c74f0e9ecc2488065de811ae76e71914549e6
MD5 c3fb5035830af15c84fe4533fcbc92be
SHA1 9ca0a70141b9d9dfc5a2d304946d71e50225fc42
SHA512 7742d21ddda5cb9bb900cef002e0aab71cccb26d8a5173de5bd0ee08d5fa91d6297b67ce39e2595dcbf6a7c9d563a1a7aae90e5644ce65ccb76f92580fce045e
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXq:tLsF2Kerc64sTiX2IV0Dzloq
TLSH
T11EE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4152-13-0x00000000004F0000-0x00000000004F6000-memory.dmp

Download

memory/4556-7-0x0000000000460000-0x0000000000466000-memory.dmp

Download

memory/4564-10-0x0000000000600000-0x0000000000606000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads