juko | fa0e88d3ecfa9aa478932bf75236c5a3fbb1a442bb8de860fd14fdfdecfeebaa

General

Target
2026-09-29_1e0777c096d8f53926742a69844bf2f8_elex_wannacry.exe
Size 47KB
Sample260930-3b3mfawdmc
SHA256 fa0e88d3ecfa9aa478932bf75236c5a3fbb1a442bb8de860fd14fdfdecfeebaa
MD5 1e0777c096d8f53926742a69844bf2f8
SHA1 30f0a1831f3d5c82d09fcbb586a3505075b060a7
SHA512 f872b83bd87e3ad5805934792c62fcd48c6960e3732ae4dd789531e240cf9b0f7c30eb9d4795b3535c75c2167736abe0377a0b20e7ae7307fc0ba7543eda9686
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJf:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxt
TLSH
T148235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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/0x000900000001b890-4.dat	family_juko
behavioral2/files/0x000e00000001c4e7-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5920	WINWORD.exe
2528	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-1-5-21-2714045687-1127350534-2056456672-1000\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
4636	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	2026-09-29_1e0777c096d8f53926742a69844bf2f8_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
1532	PING.EXE
6032	PING.EXE
4636	cmd.exe
4156	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4156	PING.EXE
1532	PING.EXE
6032	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 704 wrote to memory of 5920	704	2026-09-29_1e0777c096d8f53926742a69844bf2f8_elex_wannacry.exe	90
PID 5920 wrote to memory of 4636	5920	WINWORD.exe	91
PID 4636 wrote to memory of 4156	4636	cmd.exe	93
PID 4636 wrote to memory of 1532	4636	cmd.exe	94
PID 4636 wrote to memory of 6032	4636	cmd.exe	95
PID 4636 wrote to memory of 2528	4636	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-09-29_1e0777c096d8f53926742a69844bf2f8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-29_1e0777c096d8f53926742a69844bf2f8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:704
- 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:5920
- - 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\00003BF3" 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:4636
  - - 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:4156
  - - 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:1532
  - - 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:6032
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:2528

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00003BF3

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003BF3
Size 47KB
SHA256 c678aed36cbf3fdd3d589e09829fd84f57ef04813016702bfe0081f58cfc6e83
MD5 ebb32ad9052d3adcdd519edd26dbdd86
SHA1 a1280d93fee0a24b3e6a6344023f0bf98b7000eb
SHA512 9956107d3ef3ea40d883105b764d058a758281ceb95f095e0288bc07051ed732d9e8b9b25ae14276bee96d9deff474b15e8c20289555a595adfc17b82d171dd2
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJh:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxf
TLSH
T18F235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 fa0e88d3ecfa9aa478932bf75236c5a3fbb1a442bb8de860fd14fdfdecfeebaa
MD5 1e0777c096d8f53926742a69844bf2f8
SHA1 30f0a1831f3d5c82d09fcbb586a3505075b060a7
SHA512 f872b83bd87e3ad5805934792c62fcd48c6960e3732ae4dd789531e240cf9b0f7c30eb9d4795b3535c75c2167736abe0377a0b20e7ae7307fc0ba7543eda9686
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJf:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxt
TLSH
T148235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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