juko | 0cdcb197f71c4b514eab84969448769167d1f52da121c164b9c7af68d6752906

General

Target
2026-10-14_e5eca16056b938bb3df35b3f37ebc928_elex_wannacry.exe
Size 64KB
Sample261014-lt2dnabs2v
SHA256 0cdcb197f71c4b514eab84969448769167d1f52da121c164b9c7af68d6752906
MD5 e5eca16056b938bb3df35b3f37ebc928
SHA1 f66a591cf323321b28f91b14393e90c333d6ad9c
SHA512 391f2869a008391a356b02039574ddc8f0a5b011b6b25a9bfb5a3ea91177c626500d5389e7ac69cc0597b9e318712c07143b91b1e4b53726e5b4100d44cc06dd
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDs:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8E
TLSH
T1D35338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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
behavioral1/files/0x00110000000232d7-3.dat	family_juko
behavioral1/files/0x00050000000006d3-12.dat	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-1-5-21-747854149-4118156852-591593384-1000\Control Panel\International\Geo\Nation	2026-10-14_e5eca16056b938bb3df35b3f37ebc928_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-747854149-4118156852-591593384-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1764	WINWORD.exe
5048	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-1-5-21-747854149-4118156852-591593384-1000\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
4964	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	2026-10-14_e5eca16056b938bb3df35b3f37ebc928_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
4964	cmd.exe
1364	PING.EXE
4448	PING.EXE
4456	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1364	PING.EXE
4448	PING.EXE
4456	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1164 wrote to memory of 1764	1164	2026-10-14_e5eca16056b938bb3df35b3f37ebc928_elex_wannacry.exe	89
PID 1764 wrote to memory of 4964	1764	WINWORD.exe	90
PID 4964 wrote to memory of 1364	4964	cmd.exe	92
PID 4964 wrote to memory of 4448	4964	cmd.exe	93
PID 4964 wrote to memory of 4456	4964	cmd.exe	96
PID 4964 wrote to memory of 5048	4964	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\2026-10-14_e5eca16056b938bb3df35b3f37ebc928_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-14_e5eca16056b938bb3df35b3f37ebc928_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1164
- 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:1764
- - 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\000040B3" 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:4964
  - - 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:1364
  - - 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:4448
  - - 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:4456
  - - 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:5048

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000040B3

Path C:\Users\Admin\AppData\Roaming\Mozilla\000040B3
Size 64KB
SHA256 ea852360e243849b5bc26bc3edae07fd8249382a7f387956cc6e036ea0169691
MD5 3a9bcbd3191bb60abb7a62c80fbec2d7
SHA1 cc2c12c14a5d8e4df625cf1700c110ecb397523a
SHA512 deee5042e3c589f306fbb6dbe3e0198e654ba1ee68107c33bbac0e05c2de33ac520c2cd64b10763a2071b9d144c7edad2555d493675709758f1d6e80252189a3
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDV:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8t
TLSH
T1705338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 0cdcb197f71c4b514eab84969448769167d1f52da121c164b9c7af68d6752906
MD5 e5eca16056b938bb3df35b3f37ebc928
SHA1 f66a591cf323321b28f91b14393e90c333d6ad9c
SHA512 391f2869a008391a356b02039574ddc8f0a5b011b6b25a9bfb5a3ea91177c626500d5389e7ac69cc0597b9e318712c07143b91b1e4b53726e5b4100d44cc06dd
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDs:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8E
TLSH
T1D35338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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