juko | 53dbe681913d8945b212276e7ee0def02e75bdcfe675bc7217fd7853088591bc

General

Target
2026-08-09_a287a50ec06473670b9d4182e3c9df7a_elex_wannacry.exe
Size 87KB
Sample260809-3t4mfsda24
SHA256 53dbe681913d8945b212276e7ee0def02e75bdcfe675bc7217fd7853088591bc
MD5 a287a50ec06473670b9d4182e3c9df7a
SHA1 d9e71e61fb4c2005bbb8e0af2164ef2df965ee99
SHA512 9013b57d551cc0c4b5e5c45b89bc34df9edc5770e18aa6ccbad478db84e36e1593339d5e4445baea45cc37efde09ed79e5cf127073eb7abf7fa19e37aed94e1b
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpM:2Ly2Kerc64CiGIm1K851YO6EQkwpM
TLSH
T19493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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 7 IoCs

resource	yara_rule
behavioral1/memory/1388-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000b000000024388-5.dat	family_juko
behavioral1/memory/1388-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/2436-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000900000002447f-15.dat	family_juko
behavioral1/memory/1264-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/1264-18-0x0000000000400000-0x0000000000425000-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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-08-09_a287a50ec06473670b9d4182e3c9df7a_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2436	WINWORD.exe
1264	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-1-5-21-668679576-120646659-2289335452-1000\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
4704	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	2026-08-09_a287a50ec06473670b9d4182e3c9df7a_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
4704	cmd.exe
5072	PING.EXE
3296	PING.EXE
552	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5072	PING.EXE
3296	PING.EXE
552	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1388 wrote to memory of 2436	1388	2026-08-09_a287a50ec06473670b9d4182e3c9df7a_elex_wannacry.exe	85
PID 2436 wrote to memory of 4704	2436	WINWORD.exe	86
PID 4704 wrote to memory of 5072	4704	cmd.exe	88
PID 4704 wrote to memory of 3296	4704	cmd.exe	89
PID 4704 wrote to memory of 552	4704	cmd.exe	90
PID 4704 wrote to memory of 1264	4704	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-08-09_a287a50ec06473670b9d4182e3c9df7a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_a287a50ec06473670b9d4182e3c9df7a_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1388
- 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:2436
- - 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\0000407F" 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:4704
  - - 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:5072
  - - 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:3296
  - - 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:552
  - - 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:1264

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

Replay Monitor

Loading Replay Monitor...

Downloads

0000407F

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000407F
Size 87KB
SHA256 9a7431c3f37d993557b384fecf06dd78f8dd8651ed26ed99811a69198e3e078d
MD5 c7a4e3fbc7551c4fddbe2cb38c65af9e
SHA1 b15888063e7cb4c609da2fcb313f49da6188180e
SHA512 70e59d7f710d316a939e5a35e3c4fb8abc196f5ed1c9f925c4df2be8a035c43830af1a0c6b8e3cfc663f885b9dbdd1101c5a951612848131f1e498797bacf9ee
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpg:2Ly2Kerc64CiGIm1K851YO6EQkwpg
TLSH
T10893A1763A259190C48BD178E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 53dbe681913d8945b212276e7ee0def02e75bdcfe675bc7217fd7853088591bc
MD5 a287a50ec06473670b9d4182e3c9df7a
SHA1 d9e71e61fb4c2005bbb8e0af2164ef2df965ee99
SHA512 9013b57d551cc0c4b5e5c45b89bc34df9edc5770e18aa6ccbad478db84e36e1593339d5e4445baea45cc37efde09ed79e5cf127073eb7abf7fa19e37aed94e1b
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpM:2Ly2Kerc64CiGIm1K851YO6EQkwpM
TLSH
T19493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1264-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1264-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1388-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1388-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2436-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads