juko | a52bb5edd9efb29e7fa60760b14825fe04873628af861f40414113c4906eba6c

General

Target
2026-05-04_07b1ac7a0330fdac30e7546815511d9d_elex_wannacry.exe
Size 49KB
Sample260504-pd344aex7p
SHA256 a52bb5edd9efb29e7fa60760b14825fe04873628af861f40414113c4906eba6c
MD5 07b1ac7a0330fdac30e7546815511d9d
SHA1 a2623ed816f96ec94a7e5fa1441c142216515693
SHA512 f4f320be5e96ac9a1206f380b3e3acd7c9d6802e5a9a564b62fec3707c42fc0a202aa28b1275e441b1790a7c0f0f124053af384421475f8362d19fee8a347bf1
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2u:VLy2Kerc64CiGImVucp4kojWh2u
TLSH
T1F7334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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 8 IoCs

resource	yara_rule
behavioral1/memory/2632-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x009900000001b598-5.dat	family_juko
behavioral1/memory/3300-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2632-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3300-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00090000000243d1-16.dat	family_juko
behavioral1/memory/2440-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2440-19-0x0000000000400000-0x0000000000420000-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-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	2026-05-04_07b1ac7a0330fdac30e7546815511d9d_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3300	WINWORD.exe
2440	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-1-5-21-2714754311-527593155-1440850301-1000\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	2026-05-04_07b1ac7a0330fdac30e7546815511d9d_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
2948	cmd.exe
2568	PING.EXE
4188	PING.EXE
4268	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2568	PING.EXE
4188	PING.EXE
4268	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2632 wrote to memory of 3300	2632	2026-05-04_07b1ac7a0330fdac30e7546815511d9d_elex_wannacry.exe	84
PID 3300 wrote to memory of 2948	3300	WINWORD.exe	85
PID 2948 wrote to memory of 2568	2948	cmd.exe	87
PID 2948 wrote to memory of 4188	2948	cmd.exe	88
PID 2948 wrote to memory of 4268	2948	cmd.exe	89
PID 2948 wrote to memory of 2440	2948	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-05-04_07b1ac7a0330fdac30e7546815511d9d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-04_07b1ac7a0330fdac30e7546815511d9d_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2632
- 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:3300
- - 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\00000278" 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:2948
  - - 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:2568
  - - 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:4188
  - - 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:4268
  - - 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:2440

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

00000278

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000278
Size 49KB
SHA256 1dd0317f3c7c32f0f7a2636953c25001165718d6e37af31e847234475e268946
MD5 dc6163792843f828763524e18ffdd847
SHA1 142ccf57509852c5054e5917f79a2cebe0013290
SHA512 9aa0778468c37a934be2828e0acd051f642a3fbe421951c72572ca633091afd3767339ef6fce97e9d8bf53d64ceec30edb0baf6e78b56b03b1d5235915b2e675
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2k:VLy2Kerc64CiGImVucp4kojWh2k
TLSH
T1C9334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 a52bb5edd9efb29e7fa60760b14825fe04873628af861f40414113c4906eba6c
MD5 07b1ac7a0330fdac30e7546815511d9d
SHA1 a2623ed816f96ec94a7e5fa1441c142216515693
SHA512 f4f320be5e96ac9a1206f380b3e3acd7c9d6802e5a9a564b62fec3707c42fc0a202aa28b1275e441b1790a7c0f0f124053af384421475f8362d19fee8a347bf1
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2u:VLy2Kerc64CiGImVucp4kojWh2u
TLSH
T1F7334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2440-18-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2440-19-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2632-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2632-13-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3300-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3300-15-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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