juko | a888241401321b0676c23b90dc004d6cdfc1037989d9a7316c5529d27f8d6aef

General

Target
2026-05-16_90f366aeed93e7e26749634dcf88c5e3_elex_wannacry.exe
Size 32KB
Sample260516-jgqehsbw6z
SHA256 a888241401321b0676c23b90dc004d6cdfc1037989d9a7316c5529d27f8d6aef
MD5 90f366aeed93e7e26749634dcf88c5e3
SHA1 370a298a073e6c6357383b993b94e32a5dae8d2f
SHA512 4dea170ac663c5cd11af363bf454663dbe6640c4493959fe55a4f2b868ee83e5f33c6bcc148fd5b8350eb42851aad7b67154087d0ddc9542dfa75b1d63ae18f4
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp4:OLsF2Kerc64sTiX2IV0Dhu4
TLSH
T153E23A1B2AA17052C59320B0FA991F34C57D4DB6116BB066FB417B6928B2D63CFB0DCE
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/0x0018000000024459-4.dat	family_juko
behavioral1/files/0x000a000000024711-12.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-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	2026-05-16_90f366aeed93e7e26749634dcf88c5e3_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
5720	WINWORD.exe
964	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	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_90f366aeed93e7e26749634dcf88c5e3_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

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
4632	cmd.exe
5688	PING.EXE
2872	PING.EXE
2804	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5688	PING.EXE
2872	PING.EXE
2804	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1756 wrote to memory of 5720	1756	2026-05-16_90f366aeed93e7e26749634dcf88c5e3_elex_wannacry.exe	88
PID 5720 wrote to memory of 4632	5720	WINWORD.exe	89
PID 4632 wrote to memory of 5688	4632	cmd.exe	91
PID 4632 wrote to memory of 2872	4632	cmd.exe	93
PID 4632 wrote to memory of 2804	4632	cmd.exe	94
PID 4632 wrote to memory of 964	4632	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-05-16_90f366aeed93e7e26749634dcf88c5e3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-16_90f366aeed93e7e26749634dcf88c5e3_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1756
- 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:5720
- - 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\00004534" 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:4632
  - - 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:5688
  - - 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:2872
  - - 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:2804
  - - 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:964

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

00004534

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004534
Size 32KB
SHA256 2a7b8331495c666f9ce9478024c266521c445ee033c2fe52b4e91378bb40550e
MD5 fb9d2ad99f6b37bc98fd0b34d3bdb961
SHA1 e3b8265f5b50168da65e8429e669b42fe6ceac88
SHA512 da0c9d8b5c14a3cb5acccca1ab01329be3dd85e064b3621949fae7c0c04548205c69f6ee1eb8e2a754928731698831359d0f6664da5f4ba649b7e7541453576b
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpu:OLsF2Kerc64sTiX2IV0Dhuu
TLSH
T11DE23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 a888241401321b0676c23b90dc004d6cdfc1037989d9a7316c5529d27f8d6aef
MD5 90f366aeed93e7e26749634dcf88c5e3
SHA1 370a298a073e6c6357383b993b94e32a5dae8d2f
SHA512 4dea170ac663c5cd11af363bf454663dbe6640c4493959fe55a4f2b868ee83e5f33c6bcc148fd5b8350eb42851aad7b67154087d0ddc9542dfa75b1d63ae18f4
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp4:OLsF2Kerc64sTiX2IV0Dhu4
TLSH
T153E23A1B2AA17052C59320B0FA991F34C57D4DB6116BB066FB417B6928B2D63CFB0DCE
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