juko | 67f3a8e6e6a8d1b69a8f8c9c396609b51ae2bd2c551b85d6cac9a35711e1661c

General

Target
2026-07-05_675a59c8b0701ba853a720f7ad5ee24c_elex_wannacry.exe
Size 153KB
Sample260705-tk9mnshv3j
SHA256 67f3a8e6e6a8d1b69a8f8c9c396609b51ae2bd2c551b85d6cac9a35711e1661c
MD5 675a59c8b0701ba853a720f7ad5ee24c
SHA1 5e5ec3557178c67fba0dbc70bfe6e9c3f1cb56f8
SHA512 9b80ac47f4a5a940cb5ed8d4d8fe953712a33454fdb459f1b0feb04ece864a3748c44d08e32634aadc958ea9493b7afab6ef5bb19d07a3b250726664ca294694
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gH:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZl
TLSH
T145E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
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/464-0-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral1/files/0x000b000000024384-5.dat	family_juko
behavioral1/memory/464-12-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral1/memory/2520-14-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral1/files/0x000900000002453b-15.dat	family_juko
behavioral1/memory/4588-17-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral1/memory/4588-18-0x0000000000400000-0x000000000043B000-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-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	2026-07-05_675a59c8b0701ba853a720f7ad5ee24c_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2520	WINWORD.exe
4588	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-1-5-21-2370214745-1838013427-2987045292-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-05_675a59c8b0701ba853a720f7ad5ee24c_elex_wannacry.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
3804	PING.EXE
3544	PING.EXE
728	PING.EXE
5084	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
728	PING.EXE
3804	PING.EXE
3544	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 464 wrote to memory of 2520	464	2026-07-05_675a59c8b0701ba853a720f7ad5ee24c_elex_wannacry.exe	85
PID 2520 wrote to memory of 5084	2520	WINWORD.exe	86
PID 5084 wrote to memory of 3804	5084	cmd.exe	88
PID 5084 wrote to memory of 3544	5084	cmd.exe	89
PID 5084 wrote to memory of 728	5084	cmd.exe	90
PID 5084 wrote to memory of 4588	5084	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-07-05_675a59c8b0701ba853a720f7ad5ee24c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-05_675a59c8b0701ba853a720f7ad5ee24c_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:464
- 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:2520
- - 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\00006F43" 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:5084
  - - 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:3804
  - - 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:3544
  - - 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:728
  - - 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:4588

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

00006F43

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006F43
Size 153KB
SHA256 659ce45f16c4aad77797898527b131775078d3ab5cf6d339ef1caef5fe1b0c8d
MD5 01caa4b14d52a78c14f71f3c0c32e3ba
SHA1 fe2d500afbad82d84f370c56f12f4db49db8a12a
SHA512 07671ca0bb099cc7416f77270eee5d98dfeb92389e7c22587977a89664b62a1a610e1a39422c424d394a5f15abc06799bce209aade658f4091b9909869ba5a29
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gI:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZ+
TLSH
T10FE35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 153KB
SHA256 67f3a8e6e6a8d1b69a8f8c9c396609b51ae2bd2c551b85d6cac9a35711e1661c
MD5 675a59c8b0701ba853a720f7ad5ee24c
SHA1 5e5ec3557178c67fba0dbc70bfe6e9c3f1cb56f8
SHA512 9b80ac47f4a5a940cb5ed8d4d8fe953712a33454fdb459f1b0feb04ece864a3748c44d08e32634aadc958ea9493b7afab6ef5bb19d07a3b250726664ca294694
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gH:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZl
TLSH
T145E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/464-0-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/464-12-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/2520-14-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/4588-17-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/4588-18-0x0000000000400000-0x000000000043B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads