juko | 5670ac768c533361d0abacfed1f8b85470200b398e3570a795136e6ac895df3b

General

Target
2026-05-02_b12fbf17cb29ccca41f0da52d3d40119_elex_wannacry.exe
Size 88KB
Sample260502-pgcfjse12x
SHA256 5670ac768c533361d0abacfed1f8b85470200b398e3570a795136e6ac895df3b
MD5 b12fbf17cb29ccca41f0da52d3d40119
SHA1 31aacbe9b42b501f6cdb2ccaf09e731c506065a8
SHA512 22c1500b76bdda1ae3c8f5766e4a574d7d7259e8173fab2a086cde7fe105bbd3b98c24ff9ef6369f4c1d657c3a6f6e278d1b1af66eb004177f9e5947a8ebd709
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs4:zLy2Kerc64CiGImHc/28wzCBlycJWeeP
TLSH
T1C2933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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 7 IoCs

resource	yara_rule
behavioral1/memory/4980-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x000d00000001f0ad-5.dat	family_juko
behavioral1/memory/4980-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/4888-14-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x000900000002449e-15.dat	family_juko
behavioral1/memory/2456-17-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/2456-18-0x0000000000400000-0x000000000042A000-memory.dmp	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	2026-05-02_b12fbf17cb29ccca41f0da52d3d40119_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
4888	WINWORD.exe
2456	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	2026-05-02_b12fbf17cb29ccca41f0da52d3d40119_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
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
3760	PING.EXE
1200	PING.EXE
5044	PING.EXE
4952	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3760	PING.EXE
1200	PING.EXE
5044	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4980 wrote to memory of 4888	4980	2026-05-02_b12fbf17cb29ccca41f0da52d3d40119_elex_wannacry.exe	84
PID 4888 wrote to memory of 4952	4888	WINWORD.exe	85
PID 4952 wrote to memory of 3760	4952	cmd.exe	87
PID 4952 wrote to memory of 1200	4952	cmd.exe	88
PID 4952 wrote to memory of 5044	4952	cmd.exe	89
PID 4952 wrote to memory of 2456	4952	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-05-02_b12fbf17cb29ccca41f0da52d3d40119_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-02_b12fbf17cb29ccca41f0da52d3d40119_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4980
- 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:4888
- - 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\0000511D" 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:4952
  - - 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:3760
  - - 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:1200
  - - 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:5044
  - - 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:2456

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

0000511D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000511D
Size 88KB
SHA256 abb1ef114e71e7544440a276b2b2c1b266104f37925c8965264cda3c675edfe3
MD5 9d6cee61286cb0148cbeab6e002ef651
SHA1 5300715b3d82de216a42f36f6b472e6d7f417869
SHA512 48e1006adddeca9ea3970ff6cd093dc519edda0382c62a5a44bb84980f1e3edd7ff79471b40eb01b013345d42086c2792716c92aba2a9c8a901385a65bdbb30b
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs+:zLy2Kerc64CiGImHc/28wzCBlycJWee5
TLSH
T1F1933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 5670ac768c533361d0abacfed1f8b85470200b398e3570a795136e6ac895df3b
MD5 b12fbf17cb29ccca41f0da52d3d40119
SHA1 31aacbe9b42b501f6cdb2ccaf09e731c506065a8
SHA512 22c1500b76bdda1ae3c8f5766e4a574d7d7259e8173fab2a086cde7fe105bbd3b98c24ff9ef6369f4c1d657c3a6f6e278d1b1af66eb004177f9e5947a8ebd709
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs4:zLy2Kerc64CiGImHc/28wzCBlycJWeeP
TLSH
T1C2933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2456-17-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2456-18-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4888-14-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4980-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4980-12-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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