juko | 5a7855674deccd3cc16a90cfd4a7651ada98b4c3da8a0d84bd21c52d58d9ecb7

General

Target
2026-04-25_45eb176a671ae1faa992c68e8db90bb8_elex_wannacry.exe
Size 32KB
Sample260425-bvb52saz4t
SHA256 5a7855674deccd3cc16a90cfd4a7651ada98b4c3da8a0d84bd21c52d58d9ecb7
MD5 45eb176a671ae1faa992c68e8db90bb8
SHA1 ca7fbbe8a3901b6d0872b7bbee5e57bcd9ee6b6c
SHA512 ad7dd1dcbdd751a7bfd85ca1569c4881a59b22c10ad0acdb9e859c17e10bba804f6eb12d3a78b0259384b28da3859c65c6d11f687e30b146e92cd3b6dee42d5b
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7j:ZLsF2Kerc64sTiX2IV0DKy7j
TLSH
T143E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
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/0x000a000000024324-4.dat	family_juko
behavioral1/files/0x000800000002448d-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-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	2026-04-25_45eb176a671ae1faa992c68e8db90bb8_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
628	WINWORD.exe
2988	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-1-5-21-721190819-434563495-2007910846-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-25_45eb176a671ae1faa992c68e8db90bb8_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

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
5572	PING.EXE
5712	PING.EXE
5832	cmd.exe
4008	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4008	PING.EXE
5572	PING.EXE
5712	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3444 wrote to memory of 628	3444	2026-04-25_45eb176a671ae1faa992c68e8db90bb8_elex_wannacry.exe	85
PID 628 wrote to memory of 5832	628	WINWORD.exe	86
PID 5832 wrote to memory of 4008	5832	cmd.exe	88
PID 5832 wrote to memory of 5572	5832	cmd.exe	89
PID 5832 wrote to memory of 5712	5832	cmd.exe	90
PID 5832 wrote to memory of 2988	5832	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-04-25_45eb176a671ae1faa992c68e8db90bb8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-25_45eb176a671ae1faa992c68e8db90bb8_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3444
- 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:628
- - 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\00004F54" 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:5832
  - - 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:4008
  - - 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:5572
  - - 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:5712
  - - 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:2988

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

00004F54

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004F54
Size 32KB
SHA256 c2bdb86cd9b92086278304a6314b185accc0ba3871dd67fd86dc21810369c29a
MD5 10484035e14cf2dd6e5a03a495f56663
SHA1 7d7d21a09c9b37f162809878fa55ec094232776e
SHA512 b7d60cb761679b3d9d538477253d47e4c3d7fd1ec7ade515889846517860a0fbba6e2371acd9455a04d531b505d6d8def534982690a280e59ea7a0500dca77f7
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7K:ZLsF2Kerc64sTiX2IV0DKy7K
TLSH
T1A2E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 5a7855674deccd3cc16a90cfd4a7651ada98b4c3da8a0d84bd21c52d58d9ecb7
MD5 45eb176a671ae1faa992c68e8db90bb8
SHA1 ca7fbbe8a3901b6d0872b7bbee5e57bcd9ee6b6c
SHA512 ad7dd1dcbdd751a7bfd85ca1569c4881a59b22c10ad0acdb9e859c17e10bba804f6eb12d3a78b0259384b28da3859c65c6d11f687e30b146e92cd3b6dee42d5b
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7j:ZLsF2Kerc64sTiX2IV0DKy7j
TLSH
T143E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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