juko | 6ac0fc27b2c4f237c151a6d7c86650b88e39956ce84e8d08873d2066ef034981

General

Target
2026-08-05_c19729e4f211ae9272c7d534b038b22f_elex_wannacry.exe
Size 56KB
Sample260805-kz22pstdlf
SHA256 6ac0fc27b2c4f237c151a6d7c86650b88e39956ce84e8d08873d2066ef034981
MD5 c19729e4f211ae9272c7d534b038b22f
SHA1 f1ec20cecaa91c277259b66a36ec655c54f04eab
SHA512 de792a5de3f516b4a945fc7c366947a1c5af8fb6e77ad2ad47660cf66ead6b12ad5fb1a7e94d3a5e46d675502936efc9c574597e15ef316d1711351722cc184d
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWA:PLy2Kerc64CiGImqRa8OKFE9WBA
TLSH
T1564319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/1792-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x000b000000016817-5.dat	family_juko
behavioral1/memory/1792-13-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/4312-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/4312-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x000400000001e6dc-16.dat	family_juko
behavioral1/memory/2036-18-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/2036-19-0x0000000000400000-0x0000000000422000-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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	2026-08-05_c19729e4f211ae9272c7d534b038b22f_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4312	WINWORD.exe
2036	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-1-5-21-1788976790-1541110888-1636651838-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
3608	cmd.exe

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	2026-08-05_c19729e4f211ae9272c7d534b038b22f_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
3608	cmd.exe
400	PING.EXE
2304	PING.EXE
3248	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
400	PING.EXE
2304	PING.EXE
3248	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1792 wrote to memory of 4312	1792	2026-08-05_c19729e4f211ae9272c7d534b038b22f_elex_wannacry.exe	87
PID 4312 wrote to memory of 3608	4312	WINWORD.exe	88
PID 3608 wrote to memory of 400	3608	cmd.exe	90
PID 3608 wrote to memory of 2304	3608	cmd.exe	92
PID 3608 wrote to memory of 3248	3608	cmd.exe	93
PID 3608 wrote to memory of 2036	3608	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-05_c19729e4f211ae9272c7d534b038b22f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-05_c19729e4f211ae9272c7d534b038b22f_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1792
- 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:4312
- - 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\00000D4F" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3608
  - - 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:400
  - - 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:2304
  - - 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:3248
  - - 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:2036

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

00000D4F

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000D4F
Size 56KB
SHA256 17fd41b2d689feaed978ce770804c7b70701d01f1265ec2819a5f2605389788d
MD5 fa16a99894ab5e61d4f30b810eefa8e1
SHA1 83a599f65c02c06ed5ca4b093743ebc0189e2fd3
SHA512 a217aace60590280dd879a10c602fdb4d96622779c3a2e8aadbf8b21459eb7bb2b611a3f4b2e11bf38f8e3154f098d5fa7ba9481d7d2fa1a9ee48ef4308f159d
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGW5:PLy2Kerc64CiGImqRa8OKFE9WB5
TLSH
T10D4319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 6ac0fc27b2c4f237c151a6d7c86650b88e39956ce84e8d08873d2066ef034981
MD5 c19729e4f211ae9272c7d534b038b22f
SHA1 f1ec20cecaa91c277259b66a36ec655c54f04eab
SHA512 de792a5de3f516b4a945fc7c366947a1c5af8fb6e77ad2ad47660cf66ead6b12ad5fb1a7e94d3a5e46d675502936efc9c574597e15ef316d1711351722cc184d
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWA:PLy2Kerc64CiGImqRa8OKFE9WBA
TLSH
T1564319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1792-0-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/1792-13-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/2036-18-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/2036-19-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/4312-12-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/4312-15-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads