juko | 7f792cb9dfa8d239cd3b51b8bd8a54da41c40dc598d113cf4413930c26389a7b

General

Target
2026-10-25_bd0d4bada1437924a211b0e788e65151_elex_wannacry.exe
Size 59KB
Sample261026-repdfas19p
SHA256 7f792cb9dfa8d239cd3b51b8bd8a54da41c40dc598d113cf4413930c26389a7b
MD5 bd0d4bada1437924a211b0e788e65151
SHA1 9970439e95db7aa1dcd163c23d92f22528132766
SHA512 73a9d70b5a15d6069ab90c54f784c3d42e6d2ec570505972fce15df1c227a674fcbab7ea7acccfaaec897c19f1c325631472c87c0d27727800fdb9b53e935d87
SSDEEP 768:ZZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpg:jLsF2Kerc64sTiX2IV0Dhug
TLSH
T17A53268D5B85C880DE805A790E5A25EA0CBD6E96EF3A73D187063BC4367354A63FF4C4
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/0x000d000000019c9f-3.dat	family_juko
behavioral2/files/0x000f00000001c550-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2920	WINWORD.exe
3528	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-1-5-21-560646293-820748483-2532804640-1000\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
4592	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	2026-10-25_bd0d4bada1437924a211b0e788e65151_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
4592	cmd.exe
3576	PING.EXE
5996	PING.EXE
3892	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3576	PING.EXE
5996	PING.EXE
3892	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3280 wrote to memory of 2920	3280	2026-10-25_bd0d4bada1437924a211b0e788e65151_elex_wannacry.exe	89
PID 2920 wrote to memory of 4592	2920	WINWORD.exe	90
PID 4592 wrote to memory of 3576	4592	cmd.exe	92
PID 4592 wrote to memory of 5996	4592	cmd.exe	93
PID 4592 wrote to memory of 3892	4592	cmd.exe	94
PID 4592 wrote to memory of 3528	4592	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-25_bd0d4bada1437924a211b0e788e65151_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-25_bd0d4bada1437924a211b0e788e65151_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3280
- 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:2920
- - 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\00006310" 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:4592
  - - 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:3576
  - - 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:5996
  - - 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:3892
  - - 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:3528

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

00006310

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006310
Size 59KB
SHA256 6bc040ba31c36b94292d6dea16e4ead2a52045346e471c1de4419809bfa0b0c2
MD5 6fc694ec1b8ac59d5861fd64f163a67d
SHA1 aef0e655dbad582070e11d53932b1677687f5392
SHA512 9af00587cc38d25b73cba65868fe74f520413142e808ebfde7120f0ad1456cb306f436a922d14c3e01072dd0a6f10c775b0f2079659f0be52e157208ac351dc7
SSDEEP 768:ZZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp/:jLsF2Kerc64sTiX2IV0Dhu/
TLSH
T16153268D5B85C880DE805A790E5A25EA0CBD6E96EF3A73D187063BC4367354A63FF4C4
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 59KB
SHA256 7f792cb9dfa8d239cd3b51b8bd8a54da41c40dc598d113cf4413930c26389a7b
MD5 bd0d4bada1437924a211b0e788e65151
SHA1 9970439e95db7aa1dcd163c23d92f22528132766
SHA512 73a9d70b5a15d6069ab90c54f784c3d42e6d2ec570505972fce15df1c227a674fcbab7ea7acccfaaec897c19f1c325631472c87c0d27727800fdb9b53e935d87
SSDEEP 768:ZZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpg:jLsF2Kerc64sTiX2IV0Dhug
TLSH
T17A53268D5B85C880DE805A790E5A25EA0CBD6E96EF3A73D187063BC4367354A63FF4C4
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