juko | 7d94b9f5be5e40f01dbaded31a1ccca542bff2e796296cbb0270d1adf656b303

General

Target
2026-04-26_f9ecf59db3a635a361bdf6a058962cbe_elex_wannacry.exe
Size 53KB
Sample260426-varjsaby8w
SHA256 7d94b9f5be5e40f01dbaded31a1ccca542bff2e796296cbb0270d1adf656b303
MD5 f9ecf59db3a635a361bdf6a058962cbe
SHA1 64ea7daa1e754f5daeab6edd16b50dcc7efddecf
SHA512 3e28ff5671785aadc48efa42a8f23ef0ba6744c9ca042de8c7562c8f371bd518b972adf7b116389e9f266365d6f3904fd5ece495bcf77eb3dc44232197cd6935
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq22:3Ly2Kerc64CiGIm1tcBMUOOF2
TLSH
T14A335C176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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/0x000900000001e423-3.dat	family_juko
behavioral1/files/0x000900000002449a-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-1-5-21-745935970-1373868228-562466063-1000\Control Panel\International\Geo\Nation	2026-04-26_f9ecf59db3a635a361bdf6a058962cbe_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-745935970-1373868228-562466063-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1672	WINWORD.exe
1904	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-1-5-21-745935970-1373868228-562466063-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-26_f9ecf59db3a635a361bdf6a058962cbe_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

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
384	cmd.exe
3784	PING.EXE
1948	PING.EXE
4956	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3784	PING.EXE
1948	PING.EXE
4956	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1732 wrote to memory of 1672	1732	2026-04-26_f9ecf59db3a635a361bdf6a058962cbe_elex_wannacry.exe	86
PID 1672 wrote to memory of 384	1672	WINWORD.exe	87
PID 384 wrote to memory of 3784	384	cmd.exe	89
PID 384 wrote to memory of 1948	384	cmd.exe	90
PID 384 wrote to memory of 4956	384	cmd.exe	91
PID 384 wrote to memory of 1904	384	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-04-26_f9ecf59db3a635a361bdf6a058962cbe_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-26_f9ecf59db3a635a361bdf6a058962cbe_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1732
- 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:1672
- - 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\00003295" 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:384
  - - 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:3784
  - - 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:1948
  - - 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:4956
  - - 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:1904

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

00003295

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003295
Size 53KB
SHA256 fc9ec073b477782a4e17192d1ab29e7c439e483ee23870e6aeda072f7ad58155
MD5 d0ec9ee3f834fb699456865771edff4e
SHA1 395c6023ea82c5788eab0b8f242ba7f3ab41b909
SHA512 586018581c16231616dd6c8ad4b540e412df2098c6f37b81a8d1c73fb126e49b210a3095dd97cd214552c8da2cf3ab1f720fc9af9e1972a33c818fbf0da384ca
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2e:3Ly2Kerc64CiGIm1tcBMUOOFe
TLSH
T168335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 7d94b9f5be5e40f01dbaded31a1ccca542bff2e796296cbb0270d1adf656b303
MD5 f9ecf59db3a635a361bdf6a058962cbe
SHA1 64ea7daa1e754f5daeab6edd16b50dcc7efddecf
SHA512 3e28ff5671785aadc48efa42a8f23ef0ba6744c9ca042de8c7562c8f371bd518b972adf7b116389e9f266365d6f3904fd5ece495bcf77eb3dc44232197cd6935
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq22:3Ly2Kerc64CiGIm1tcBMUOOF2
TLSH
T14A335C176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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