juko | 191e46b5fa6fcee15b04f4ca0bf54a891010a20280648030ae78ce80a59233fc

General

Target
2026-09-30_5373cbb814118e730c16d677ac7b2df3_elex_wannacry.exe
Size 105KB
Sample260930-nht7baea69
SHA256 191e46b5fa6fcee15b04f4ca0bf54a891010a20280648030ae78ce80a59233fc
MD5 5373cbb814118e730c16d677ac7b2df3
SHA1 325f553eac55ec6f0ff92cde7eecd86219f71c0d
SHA512 ad5ece6f2df31db6e03927bdf2398c9f345883fd544ded43a92a0a7087e88c4e032232253020df6ad9dc3ffa9e16fcd2afbfcf4a33a8bd486b2a96945340d484
SSDEEP 768:lZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHFh:XLsF2Kerc64sTiX2IV0DpKh
TLSH
T1CBB32A2B2AA57052C59320B0F9591F34C43D9DB9016BB0A2F7457B6928B2D63CF71ECE
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/0x000c00000001b2ca-4.dat	family_juko
behavioral2/files/0x000f00000001c56d-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5852	WINWORD.exe
5068	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-1-5-21-650287814-2715975232-1279715623-1000\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
5576	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	2026-09-30_5373cbb814118e730c16d677ac7b2df3_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
2688	PING.EXE
2708	PING.EXE
5576	cmd.exe
2780	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2780	PING.EXE
2688	PING.EXE
2708	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5684 wrote to memory of 5852	5684	2026-09-30_5373cbb814118e730c16d677ac7b2df3_elex_wannacry.exe	89
PID 5852 wrote to memory of 5576	5852	WINWORD.exe	90
PID 5576 wrote to memory of 2780	5576	cmd.exe	92
PID 5576 wrote to memory of 2688	5576	cmd.exe	93
PID 5576 wrote to memory of 2708	5576	cmd.exe	94
PID 5576 wrote to memory of 5068	5576	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-30_5373cbb814118e730c16d677ac7b2df3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-30_5373cbb814118e730c16d677ac7b2df3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5684
- 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:5852
- - 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\00003CAB" 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:5576
  - - 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:2780
  - - 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:2688
  - - 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:2708
  - - 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:5068

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

00003CAB

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003CAB
Size 105KB
SHA256 f2f4428385fd721ea2214c9fac23dd0cbc3eb9f1e68d929b95bfcdd1e36b0b17
MD5 2133a2a1ace74540c8cfddd5b3ccedf5
SHA1 9f09a7ae6dd281cc331224ee361a9fa14e808b17
SHA512 b914c62d95d4bc5302303aa63ee0f7c9fb3b26befb3993096dc239a2be55d7d57f80e7651f0d469e05c9d88ebba837feae2d1d70c012dc13ec4f079fda8f1c98
SSDEEP 768:lZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHFM:XLsF2Kerc64sTiX2IV0DpKM
TLSH
T150B32A2B2AA57052C59320B0F9591F34C43D9DB9016BB0A2F7457B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 105KB
SHA256 191e46b5fa6fcee15b04f4ca0bf54a891010a20280648030ae78ce80a59233fc
MD5 5373cbb814118e730c16d677ac7b2df3
SHA1 325f553eac55ec6f0ff92cde7eecd86219f71c0d
SHA512 ad5ece6f2df31db6e03927bdf2398c9f345883fd544ded43a92a0a7087e88c4e032232253020df6ad9dc3ffa9e16fcd2afbfcf4a33a8bd486b2a96945340d484
SSDEEP 768:lZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHFh:XLsF2Kerc64sTiX2IV0DpKh
TLSH
T1CBB32A2B2AA57052C59320B0F9591F34C43D9DB9016BB0A2F7457B6928B2D63CF71ECE
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