juko | 1603634f4e0f2f5721eb19890a2c6c25e7d71937dee567ff086984db4d54676d

General

Target
2026-08-23_1a47eb1787f1d76dad0b4733bd330870_elex_wannacry.exe
Size 30KB
Sample260824-tswe1sam3v
SHA256 1603634f4e0f2f5721eb19890a2c6c25e7d71937dee567ff086984db4d54676d
MD5 1a47eb1787f1d76dad0b4733bd330870
SHA1 9205e68fa741882aee8f31d6de9b841f59a3a273
SHA512 8538cd6043a0e4fc432cc8dec167a22b2571fb94c707f1c90b7e76fdc8c3abc1a8719b6fa86ddd30b6ee8375ce5b9d9efffccb7482ba488623cfa16f9cf18ea8
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXF:tLsF2Kerc64sTiX2IV0DzloF
TLSH
T138E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000c00000001b88f-4.dat	family_juko
behavioral2/files/0x000e00000001c4ed-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4692	WINWORD.exe
2720	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-1-5-21-2301830172-776172150-2531349243-1000\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
3416	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	2026-08-23_1a47eb1787f1d76dad0b4733bd330870_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
3416	cmd.exe
5368	PING.EXE
5380	PING.EXE
468	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5380	PING.EXE
468	PING.EXE
5368	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4496 wrote to memory of 4692	4496	2026-08-23_1a47eb1787f1d76dad0b4733bd330870_elex_wannacry.exe	89
PID 4692 wrote to memory of 3416	4692	WINWORD.exe	90
PID 3416 wrote to memory of 5368	3416	cmd.exe	92
PID 3416 wrote to memory of 5380	3416	cmd.exe	93
PID 3416 wrote to memory of 468	3416	cmd.exe	94
PID 3416 wrote to memory of 2720	3416	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-23_1a47eb1787f1d76dad0b4733bd330870_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-23_1a47eb1787f1d76dad0b4733bd330870_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4496
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4692
- - 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\0000227B" 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:3416
  - - 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:5368
  - - 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:5380
  - - 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:468
  - - 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:2720

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

0000227B

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000227B
Size 30KB
SHA256 3abd84ee3e3179e1d178f247e82f05445331ce18ea80d4e1befa052efc276d72
MD5 bd2fc900c7f4e17366e45786686f3203
SHA1 9b1d5c2506445dc9d86135177276ed6b614137e0
SHA512 b7968fa5bf59388915e3e115f72113c6688220edbae596bd1377f3ab003f9fcc8f2b8b712c7ce9d00cc767cd5694315bf53d984568dbc9b42f3b23ef7f0ba77d
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX5:tLsF2Kerc64sTiX2IV0Dzlo5
TLSH
T18BE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 1603634f4e0f2f5721eb19890a2c6c25e7d71937dee567ff086984db4d54676d
MD5 1a47eb1787f1d76dad0b4733bd330870
SHA1 9205e68fa741882aee8f31d6de9b841f59a3a273
SHA512 8538cd6043a0e4fc432cc8dec167a22b2571fb94c707f1c90b7e76fdc8c3abc1a8719b6fa86ddd30b6ee8375ce5b9d9efffccb7482ba488623cfa16f9cf18ea8
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXF:tLsF2Kerc64sTiX2IV0DzloF
TLSH
T138E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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