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
behavioral1/files/0x0010000000024163-4.dat	family_juko
behavioral1/files/0x000800000001e6cb-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-1-5-21-939655444-3071939294-1401108526-1000\Control Panel\International\Geo\Nation	2026-09-30_5373cbb814118e730c16d677ac7b2df3_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-939655444-3071939294-1401108526-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2344	WINWORD.exe
2148	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-1-5-21-939655444-3071939294-1401108526-1000\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
1868	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	2026-09-30_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
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
1868	cmd.exe
1944	PING.EXE
1280	PING.EXE
3712	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1944	PING.EXE
1280	PING.EXE
3712	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4180 wrote to memory of 2344	4180	2026-09-30_5373cbb814118e730c16d677ac7b2df3_elex_wannacry.exe	88
PID 2344 wrote to memory of 1868	2344	WINWORD.exe	89
PID 1868 wrote to memory of 1944	1868	cmd.exe	91
PID 1868 wrote to memory of 1280	1868	cmd.exe	94
PID 1868 wrote to memory of 3712	1868	cmd.exe	97
PID 1868 wrote to memory of 2148	1868	cmd.exe	98

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4180
- 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:2344
- - 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\00001D9F" 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:1868
  - - 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:1944
  - - 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:1280
  - - 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:3712
  - - 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:2148

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

00001D9F

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001D9F
Size 105KB
SHA256 bc31c5dcce8567958e9628e708e93c64fe0f4073fc623c67ca763318748f4437
MD5 cd8e75be362ece28b29507881dd64801
SHA1 b5bd93cf3d1f4e730439670b5deb0d96151b5a3b
SHA512 0e373b733bf169d8566b8eb58f39c886bf6a884310cf03f220659ee8d77da55a8d387c0f978b7b2990ce59b9566a39630bcdff5b63a9178263711b3157453803
SSDEEP 768:lZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHFu:XLsF2Kerc64sTiX2IV0DpKu
TLSH
T143B32A2B2AA57052C59320B0F9591F34C43D9DB9016BB0A2F7457B6928B2D63CF71ECE
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