juko | 08221972f296473ce64572cf4a10e5553b623fbf248b23ae40a103adec52bfcf

General

Target
2026-05-16_429bd2148cf0a0bd36e23637b954b435_elex_wannacry.exe
Size 32KB
Sample260516-jbee3aex9p
SHA256 08221972f296473ce64572cf4a10e5553b623fbf248b23ae40a103adec52bfcf
MD5 429bd2148cf0a0bd36e23637b954b435
SHA1 bedc8abc949761c06eb6eb9e9b997e7859e58d52
SHA512 f5e4ae959651bb37241433279c3a2fce1f88c3f3738232e9adc63976f5d884728b49a34c521f25285b2b49253a2f2303467c0f8bd32fe6e9d1543f9b3b1d5067
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfN:tLsF2Kerc64sTiX2IV0DYQF
TLSH
T140E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
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
behavioral2/files/0x0015000000025b53-4.dat	family_juko
behavioral2/files/0x001a00000002b430-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4744	WINWORD.exe
5676	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-1-5-21-2746394149-3500112804-1243524366-1000\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	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	2026-05-16_429bd2148cf0a0bd36e23637b954b435_elex_wannacry.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
6132	cmd.exe
4652	PING.EXE
5132	PING.EXE
3112	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4652	PING.EXE
5132	PING.EXE
3112	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2416 wrote to memory of 4744	2416	2026-05-16_429bd2148cf0a0bd36e23637b954b435_elex_wannacry.exe	79
PID 4744 wrote to memory of 6132	4744	WINWORD.exe	80
PID 6132 wrote to memory of 4652	6132	cmd.exe	82
PID 6132 wrote to memory of 5132	6132	cmd.exe	83
PID 6132 wrote to memory of 3112	6132	cmd.exe	84
PID 6132 wrote to memory of 5676	6132	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-16_429bd2148cf0a0bd36e23637b954b435_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-16_429bd2148cf0a0bd36e23637b954b435_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2416
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4744
- - 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\0000743C" 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:6132
  - - 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:4652
  - - 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:5132
  - - 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:3112
  - - 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:5676

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

0000743C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000743C
Size 32KB
SHA256 efedac66f24ecc60ff671327d94492d6e5c9ac22642c28bbb9ff5fd1b812a6dd
MD5 ad40bca0f73f7d6e3bb2994f39033da7
SHA1 f9dcb3064e2df5c3a53ce5763fc7471ec9c8cc75
SHA512 9865d14714a6da9dfa4f028a06e0999792737908f713e5ff91d170c7847b46f914f8e0d7f1daed9722f3e81ff6e775ad31422fd0ec393911a0a9ed4dd1fc715d
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfS:tLsF2Kerc64sTiX2IV0DYQK
TLSH
T19FE23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 08221972f296473ce64572cf4a10e5553b623fbf248b23ae40a103adec52bfcf
MD5 429bd2148cf0a0bd36e23637b954b435
SHA1 bedc8abc949761c06eb6eb9e9b997e7859e58d52
SHA512 f5e4ae959651bb37241433279c3a2fce1f88c3f3738232e9adc63976f5d884728b49a34c521f25285b2b49253a2f2303467c0f8bd32fe6e9d1543f9b3b1d5067
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbfN:tLsF2Kerc64sTiX2IV0DYQF
TLSH
T140E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads