juko | 895740e84b0dee15f7ca6baae9c69999921b713bc7a72cdab0d656bd08f0bcd6

General

Target
2026-10-28_5414ff07cf7b662e841dd25847bfa995_elex_wannacry.exe
Size 70KB
Sample261030-e35n4saw4p
SHA256 895740e84b0dee15f7ca6baae9c69999921b713bc7a72cdab0d656bd08f0bcd6
MD5 5414ff07cf7b662e841dd25847bfa995
SHA1 0ff958b6a2e7c7ba3e294b155bbecf0bae858bfe
SHA512 a9d7cb93f716384f741dedb4359bebfa479d5011f4dd3bc3959c56c57abce3d6e9a665aa1eba5dba5cc7eaf1b6866a441db9c64471daf03f981b5c4519fa8a1e
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLows3SE9nYOE:vLy2Kerc64CiGImVuX/N81rRLoD51YOE
TLSH
T1FA633906FB89DBD0F0534570E9560AA4747EACF18E63A51BB744730D2C72B16CF32A9A
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 6 IoCs

resource	yara_rule
behavioral1/memory/3392-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/files/0x00180000000242c7-4.dat	family_juko
behavioral1/memory/3392-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/memory/4904-14-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/files/0x000900000002437c-15.dat	family_juko
behavioral1/memory/536-18-0x0000000000400000-0x000000000041C000-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-1-5-21-2101206053-1414382737-268919432-1000\Control Panel\International\Geo\Nation	2026-10-28_5414ff07cf7b662e841dd25847bfa995_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2101206053-1414382737-268919432-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4904	WINWORD.exe
536	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-1-5-21-2101206053-1414382737-268919432-1000\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
2964	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-28_5414ff07cf7b662e841dd25847bfa995_elex_wannacry.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
4676	PING.EXE
3352	PING.EXE
2964	cmd.exe
4528	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4528	PING.EXE
4676	PING.EXE
3352	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3392 wrote to memory of 4904	3392	2026-10-28_5414ff07cf7b662e841dd25847bfa995_elex_wannacry.exe	83
PID 4904 wrote to memory of 2964	4904	WINWORD.exe	84
PID 2964 wrote to memory of 4528	2964	cmd.exe	86
PID 2964 wrote to memory of 4676	2964	cmd.exe	87
PID 2964 wrote to memory of 3352	2964	cmd.exe	90
PID 2964 wrote to memory of 536	2964	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-10-28_5414ff07cf7b662e841dd25847bfa995_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-28_5414ff07cf7b662e841dd25847bfa995_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3392
- 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:4904
- - 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\0000662A" 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:2964
  - - 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:4528
  - - 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:4676
  - - 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:3352
  - - 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:536

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

0000662A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000662A
Size 70KB
SHA256 1cce4e768d10a814245fb2b76d3158d59acbfa1a5c3e688fc208f837d22a6e12
MD5 36af88a806c5dba7e4897e2c7a81150a
SHA1 74b8c612f9b58d71c9b300c4a3c9d7a1b361edfc
SHA512 f2549d6e3804ce80cf33713a6999cc1fd97c50ae64f6f72660709eb8e6734d49758148a7277b97602e52e9a4cfb99ace1b3489da63869a6a000fb7f5221cd134
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLows3SE9nYOb:vLy2Kerc64CiGImVuX/N81rRLoD51YOb
TLSH
T11D633906FB89DBD0F0534570E9560AA4747EACF18E63A51BB744730D2C72B16CF32A9A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 70KB
SHA256 895740e84b0dee15f7ca6baae9c69999921b713bc7a72cdab0d656bd08f0bcd6
MD5 5414ff07cf7b662e841dd25847bfa995
SHA1 0ff958b6a2e7c7ba3e294b155bbecf0bae858bfe
SHA512 a9d7cb93f716384f741dedb4359bebfa479d5011f4dd3bc3959c56c57abce3d6e9a665aa1eba5dba5cc7eaf1b6866a441db9c64471daf03f981b5c4519fa8a1e
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLows3SE9nYOE:vLy2Kerc64CiGImVuX/N81rRLoD51YOE
TLSH
T1FA633906FB89DBD0F0534570E9560AA4747EACF18E63A51BB744730D2C72B16CF32A9A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/536-18-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/3392-0-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/3392-12-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/4904-14-0x0000000000400000-0x000000000041C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads