juko | 4d91bb3646cb2ab572739f32fe8d3681fac18bc3b5486c60f2816a05b2cbe51b

General

Target
2026-05-09_ca83b237444a68f8e4ecd85c7b4bc311_elex_wannacry.exe
Size 88KB
Sample260509-jvsrssc14z
SHA256 4d91bb3646cb2ab572739f32fe8d3681fac18bc3b5486c60f2816a05b2cbe51b
MD5 ca83b237444a68f8e4ecd85c7b4bc311
SHA1 790632fb19bff254365583a5a552dff9a508e6dc
SHA512 e6c5dbfcc2473dc33f7c19d732dc54b6fd1398b0b0dd9afa41a89b2cac37eeda0a4df44cd19da55e30da02aaf96b6128a1ccf07e22b13c3a922f5935e7b6caa4
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsl:sLy2Kerc64CiGIm8so28wzCBlycJWeea
TLSH
T14A933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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/0x000b000000021655-4.dat	family_juko
behavioral1/files/0x000b0000000243b6-14.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-1-5-21-643422742-1162610606-620613169-1000\Control Panel\International\Geo\Nation	2026-05-09_ca83b237444a68f8e4ecd85c7b4bc311_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-643422742-1162610606-620613169-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4816	WINWORD.exe
632	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-1-5-21-643422742-1162610606-620613169-1000\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	2026-05-09_ca83b237444a68f8e4ecd85c7b4bc311_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
3920	PING.EXE
1176	cmd.exe
1060	PING.EXE
5908	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1060	PING.EXE
5908	PING.EXE
3920	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4612 wrote to memory of 4816	4612	2026-05-09_ca83b237444a68f8e4ecd85c7b4bc311_elex_wannacry.exe	85
PID 4816 wrote to memory of 1176	4816	WINWORD.exe	86
PID 1176 wrote to memory of 1060	1176	cmd.exe	88
PID 1176 wrote to memory of 5908	1176	cmd.exe	89
PID 1176 wrote to memory of 3920	1176	cmd.exe	90
PID 1176 wrote to memory of 632	1176	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-09_ca83b237444a68f8e4ecd85c7b4bc311_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-09_ca83b237444a68f8e4ecd85c7b4bc311_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4612
- 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:4816
- - 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\0000076A" 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:1176
  - - 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:1060
  - - 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:5908
  - - 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:3920
  - - 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:632

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

0000076A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000076A
Size 88KB
SHA256 906b3ae67261d0633c8c2d93a356adeffa09dc5cf0bad225afb939194bec69de
MD5 7bf65433017cfc3324716a0c12aa6ead
SHA1 6a32337774421816cd8663a5f5f4453be83bfe15
SHA512 58e59e08207bb2631ec6b59ed83ed4408f02fdd88904caffd6d7091f78026324c7454a3d7c6e5179fe2768f5b9819a6e80bf8844075bc0c3182bfaaef7d73a98
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsq:sLy2Kerc64CiGIm8so28wzCBlycJWeeh
TLSH
T171934B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 4d91bb3646cb2ab572739f32fe8d3681fac18bc3b5486c60f2816a05b2cbe51b
MD5 ca83b237444a68f8e4ecd85c7b4bc311
SHA1 790632fb19bff254365583a5a552dff9a508e6dc
SHA512 e6c5dbfcc2473dc33f7c19d732dc54b6fd1398b0b0dd9afa41a89b2cac37eeda0a4df44cd19da55e30da02aaf96b6128a1ccf07e22b13c3a922f5935e7b6caa4
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsl:sLy2Kerc64CiGIm8so28wzCBlycJWeea
TLSH
T14A933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/632-16-0x00000000007D0000-0x000000000088F000-memory.dmp

Download

memory/632-18-0x00000000007D0000-0x000000000088F000-memory.dmp

Download

memory/632-28-0x00000000007D0000-0x000000000088F000-memory.dmp

Download

memory/632-29-0x00000000007D0000-0x000000000088F000-memory.dmp

Download

memory/4612-11-0x0000000000830000-0x00000000008EF000-memory.dmp

Download

memory/4816-13-0x0000000000760000-0x000000000081F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads