juko | efa3e478ce016b05ef0243a887f4ffae5ef6c2813f3033f23bbe10e1358560ca

General

Target
2026-07-08_17d136e7cc35d9a7c5802b8a3fe0eae0_elex_wannacry.exe
Size 42KB
Sample260708-2lpynaa17z
SHA256 efa3e478ce016b05ef0243a887f4ffae5ef6c2813f3033f23bbe10e1358560ca
MD5 17d136e7cc35d9a7c5802b8a3fe0eae0
SHA1 831550d9d32f924b9981e18f9a8d3cd2ea284a3a
SHA512 53beda9c76279c43d391e2927b12252fdc689a4793215dd8b281dd4dde1a6a2fd901be6b28c010dde00f26291351a653f4474f7076f54df5802fbd871f033abc
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41x:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+a
TLSH
T10013171776A460D2CDB76074E91A4E34437E9CF664A7B317A72076202DB3D5ACFA02CE
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/0x000c0000000242ee-4.dat	family_juko
behavioral1/files/0x00090000000243c4-12.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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	2026-07-08_17d136e7cc35d9a7c5802b8a3fe0eae0_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4016	WINWORD.exe
4696	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-1-5-21-1788976790-1541110888-1636651838-1000\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	2026-07-08_17d136e7cc35d9a7c5802b8a3fe0eae0_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
2092	cmd.exe
2524	PING.EXE
4924	PING.EXE
3564	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2524	PING.EXE
4924	PING.EXE
3564	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3428 wrote to memory of 4016	3428	2026-07-08_17d136e7cc35d9a7c5802b8a3fe0eae0_elex_wannacry.exe	84
PID 4016 wrote to memory of 2092	4016	WINWORD.exe	87
PID 2092 wrote to memory of 2524	2092	cmd.exe	89
PID 2092 wrote to memory of 4924	2092	cmd.exe	93
PID 2092 wrote to memory of 3564	2092	cmd.exe	94
PID 2092 wrote to memory of 4696	2092	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-08_17d136e7cc35d9a7c5802b8a3fe0eae0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-08_17d136e7cc35d9a7c5802b8a3fe0eae0_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3428
- 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:4016
- - 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\00005880" 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:2092
  - - 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:2524
  - - 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:4924
  - - 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:3564
  - - 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:4696

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

00005880

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005880
Size 42KB
SHA256 ddeaa0c111c63769178ec60b32004adf8b1698c449198104f64177632620fbe5
MD5 baa27d01029761bf3395f852f3c35ec4
SHA1 08f692a66c15ab5738dbcaee4e9ad884ae205d8c
SHA512 05c02c0559bf786760bbfc49a07514f1efda9ad76e1316d9d625f868af4b07563a36f31843304e49528ec69ae31ac4786dc021abbd7d1ecf95e6132ed88b3214
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41O:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+h
TLSH
T13B13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 efa3e478ce016b05ef0243a887f4ffae5ef6c2813f3033f23bbe10e1358560ca
MD5 17d136e7cc35d9a7c5802b8a3fe0eae0
SHA1 831550d9d32f924b9981e18f9a8d3cd2ea284a3a
SHA512 53beda9c76279c43d391e2927b12252fdc689a4793215dd8b281dd4dde1a6a2fd901be6b28c010dde00f26291351a653f4474f7076f54df5802fbd871f033abc
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41x:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+a
TLSH
T10013171776A460D2CDB76074E91A4E34437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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