juko | 1cd5b148b4d81c436faa70e4f32786b912315fa77956c669ec6b164fc0b01c84

General

Target
2026-10-21_9418a2655719cb7a8f78e9c3bf80a4e0_elex_wannacry.exe
Size 34KB
Sample261022-vf7sysgt2k
SHA256 1cd5b148b4d81c436faa70e4f32786b912315fa77956c669ec6b164fc0b01c84
MD5 9418a2655719cb7a8f78e9c3bf80a4e0
SHA1 faef6d20d18d9451c62dcbfcf47a2482c7d3cbd6
SHA512 0694871a1bad593428d805c1501ee0f1c6b32c04170777cd092a7d1067f3bf840e563166155282c07d1267dbaa6785291e035c20ddab8c69097fdad951d311c9
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp+7mpf:OLsF2Kerc64sTiX2IV0Dhu+76f
TLSH
T13EF2292F29927052C59250B0E9DC2F70847D9CB6116BB166EB41BB692CB2C63CF719CE
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/0x000c000000023885-3.dat	family_juko
behavioral1/files/0x000900000002478f-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-1-5-21-2091445952-3649787497-104050984-1000\Control Panel\International\Geo\Nation	2026-10-21_9418a2655719cb7a8f78e9c3bf80a4e0_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2091445952-3649787497-104050984-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3756	WINWORD.exe
5904	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-1-5-21-2091445952-3649787497-104050984-1000\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
4396	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-21_9418a2655719cb7a8f78e9c3bf80a4e0_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

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
3060	PING.EXE
4120	PING.EXE
4396	cmd.exe
3920	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3060	PING.EXE
4120	PING.EXE
3920	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5216 wrote to memory of 3756	5216	2026-10-21_9418a2655719cb7a8f78e9c3bf80a4e0_elex_wannacry.exe	86
PID 3756 wrote to memory of 4396	3756	WINWORD.exe	87
PID 4396 wrote to memory of 3920	4396	cmd.exe	89
PID 4396 wrote to memory of 3060	4396	cmd.exe	91
PID 4396 wrote to memory of 4120	4396	cmd.exe	94
PID 4396 wrote to memory of 5904	4396	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\2026-10-21_9418a2655719cb7a8f78e9c3bf80a4e0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-21_9418a2655719cb7a8f78e9c3bf80a4e0_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5216
- 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:3756
- - 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\00006CBF" 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:4396
  - - 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:3920
  - - 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:3060
  - - 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:4120
  - - 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:5904

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

00006CBF

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006CBF
Size 34KB
SHA256 bf2a436dc7603f0af90231ec4b9199159e51cd22fdaaf76159c29474625d31a8
MD5 1affd6b6c05737688c063cbe246d4919
SHA1 fce1d33b00c131f404586ba2f20a8d725f616d6e
SHA512 07a3a0b6010931cadb4f10fa792fd89b1663fefc335d3a85b082febc79f765782947902e5a511682c804ae3cc97e4f54822ebfdf76cb80c4be4a09a3a721106d
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp+7mp1:OLsF2Kerc64sTiX2IV0Dhu+761
TLSH
T123F2292F29927052C59250B0F9DC2F70847D9CB6116BB166EB40BB692CB2C63CF719CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 34KB
SHA256 1cd5b148b4d81c436faa70e4f32786b912315fa77956c669ec6b164fc0b01c84
MD5 9418a2655719cb7a8f78e9c3bf80a4e0
SHA1 faef6d20d18d9451c62dcbfcf47a2482c7d3cbd6
SHA512 0694871a1bad593428d805c1501ee0f1c6b32c04170777cd092a7d1067f3bf840e563166155282c07d1267dbaa6785291e035c20ddab8c69097fdad951d311c9
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp+7mpf:OLsF2Kerc64sTiX2IV0Dhu+76f
TLSH
T13EF2292F29927052C59250B0E9DC2F70847D9CB6116BB166EB41BB692CB2C63CF719CE
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