juko | bb5015a63cf0e582b686d59691b9b2685e3972f067bf25e44b404f22c24e8f73

General

Target
2026-05-04_1ecbd6cefa9cf780d214f2a99d514c8f_elex_wannacry.exe
Size 57KB
Sample260504-d2dnkabw81
SHA256 bb5015a63cf0e582b686d59691b9b2685e3972f067bf25e44b404f22c24e8f73
MD5 1ecbd6cefa9cf780d214f2a99d514c8f
SHA1 c3de6fb6a7c5d114914ebfd7e052a1a2ad0219fb
SHA512 67f410247a57d0a5db4d0a50f785f79d0ae7ee8f7b8ff40b8739fe567d7372a0cd17e4c5b8965356e5a5b22874883c86e665d7a10be981c60e282d6aa2a807b1
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqa6:wLy2Kerc64CiGImEsoDfa6
TLSH
T1C3433913366414D1D8AB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFA83CE
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/4708-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/files/0x001800000001e54c-5.dat	family_juko
behavioral1/memory/4708-11-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/memory/752-14-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/files/0x001c000000023c50-15.dat	family_juko
behavioral1/memory/384-17-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/memory/384-18-0x0000000000400000-0x000000000041F000-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	2026-05-04_1ecbd6cefa9cf780d214f2a99d514c8f_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
752	WINWORD.exe
384	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	2026-05-04_1ecbd6cefa9cf780d214f2a99d514c8f_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
2800	PING.EXE
6024	PING.EXE
1124	PING.EXE
5276	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2800	PING.EXE
6024	PING.EXE
1124	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4708 wrote to memory of 752	4708	2026-05-04_1ecbd6cefa9cf780d214f2a99d514c8f_elex_wannacry.exe	85
PID 752 wrote to memory of 5276	752	WINWORD.exe	86
PID 5276 wrote to memory of 2800	5276	cmd.exe	88
PID 5276 wrote to memory of 6024	5276	cmd.exe	90
PID 5276 wrote to memory of 1124	5276	cmd.exe	91
PID 5276 wrote to memory of 384	5276	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-05-04_1ecbd6cefa9cf780d214f2a99d514c8f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-04_1ecbd6cefa9cf780d214f2a99d514c8f_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4708
- 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:752
- - 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\00000296" 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:5276
  - - 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:2800
  - - 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:6024
  - - 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:1124
  - - 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:384

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

00000296

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000296
Size 57KB
SHA256 5609654d3a70f6a0100bffe6bc2e186a8cb1330f14cba798118dea7cb03ff30e
MD5 04584a68ae2b5506cbbd8f94e321c1a9
SHA1 1bb0add68903728013d9068cfa36f232610104b6
SHA512 6aa578740b816b7267415b9cffa3aa9e8959e3199b2820dbda0087850ea0848ece281f77b4adeb54ca19db79815c4e3f8f2bcf75437b670db8837e9b080d4575
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqal:wLy2Kerc64CiGImEsoDfal
TLSH
T166433913366414D1D8BB2138A4025E354BB8BDB21467F222B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 bb5015a63cf0e582b686d59691b9b2685e3972f067bf25e44b404f22c24e8f73
MD5 1ecbd6cefa9cf780d214f2a99d514c8f
SHA1 c3de6fb6a7c5d114914ebfd7e052a1a2ad0219fb
SHA512 67f410247a57d0a5db4d0a50f785f79d0ae7ee8f7b8ff40b8739fe567d7372a0cd17e4c5b8965356e5a5b22874883c86e665d7a10be981c60e282d6aa2a807b1
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqa6:wLy2Kerc64CiGImEsoDfa6
TLSH
T1C3433913366414D1D8AB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFA83CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/384-17-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/384-18-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/752-14-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4708-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4708-11-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads