juko | d4d056cfd7e224ec4daa5e9645b97a676cac07d3155aa7e67f90d55f9202cf6f

General

Target
2026-10-25_b4ef450859b0a2fe2986e99a799d39c6_elex_wannacry.exe
Size 35KB
Sample261026-slw8astv8p
SHA256 d4d056cfd7e224ec4daa5e9645b97a676cac07d3155aa7e67f90d55f9202cf6f
MD5 b4ef450859b0a2fe2986e99a799d39c6
SHA1 e15a4a73188e36df65a0492d55a1cc0813503272
SHA512 bab34728d3f41bb4d2df32f56e1f1503e67eadca108fce4dfc708978c4b7830d82982e72f2f4e31dcc2859eeaed22d7db0a4a0b7475a8dd3747432231d048c58
SSDEEP 768:9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpX/NB:vLsF2Kerc64sTiX2IV0DhuX/NB
TLSH
T1C7F24B1A6AA16042E59314B0FDA91F34C47D9CB6217BB06BE7403A1928B2D57CF70FDE
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 7 IoCs

resource	yara_rule
behavioral1/memory/860-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/files/0x000500000002325d-4.dat	family_juko
behavioral1/memory/860-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/memory/456-14-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/files/0x000900000002438f-15.dat	family_juko
behavioral1/memory/1876-18-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/memory/1876-19-0x0000000000400000-0x000000000041C000-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-1-5-21-895009113-1202185046-1686627690-1000\Control Panel\International\Geo\Nation	2026-10-25_b4ef450859b0a2fe2986e99a799d39c6_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-895009113-1202185046-1686627690-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
456	WINWORD.exe
1876	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-1-5-21-895009113-1202185046-1686627690-1000\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
2472	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	2026-10-25_b4ef450859b0a2fe2986e99a799d39c6_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
3164	PING.EXE
4148	PING.EXE
3844	PING.EXE
2472	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3164	PING.EXE
4148	PING.EXE
3844	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 860 wrote to memory of 456	860	2026-10-25_b4ef450859b0a2fe2986e99a799d39c6_elex_wannacry.exe	84
PID 456 wrote to memory of 2472	456	WINWORD.exe	85
PID 2472 wrote to memory of 3164	2472	cmd.exe	87
PID 2472 wrote to memory of 4148	2472	cmd.exe	90
PID 2472 wrote to memory of 3844	2472	cmd.exe	93
PID 2472 wrote to memory of 1876	2472	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-10-25_b4ef450859b0a2fe2986e99a799d39c6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-25_b4ef450859b0a2fe2986e99a799d39c6_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:860
- 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:456
- - 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\000034BC" 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:2472
  - - 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:3164
  - - 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:4148
  - - 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:3844
  - - 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:1876

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

000034BC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000034BC
Size 35KB
SHA256 8da40c42ba935afe2c344291160f22ed4384f6ee6cda064d1c9408d026343bfe
MD5 2b1eda8e1b76ec874282012cefde3823
SHA1 047eaf7dc3a2714f07064b111c20e1706e8cb29a
SHA512 1c00b7c8979dbb7a18930e7f3ef7310aba2617c641624aee83489a2dfa7f20854b3f5ae3e7bd714f3014977272494a71a82c8a6a6ce1b20f56ae4d1f6876b6b9
SSDEEP 768:9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpX/Nw:vLsF2Kerc64sTiX2IV0DhuX/Nw
TLSH
T10EF23B1A6AA16042E59314B0FDA91F34C47D9C76217BB06BE7403A1928B2D57CF70FDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 35KB
SHA256 d4d056cfd7e224ec4daa5e9645b97a676cac07d3155aa7e67f90d55f9202cf6f
MD5 b4ef450859b0a2fe2986e99a799d39c6
SHA1 e15a4a73188e36df65a0492d55a1cc0813503272
SHA512 bab34728d3f41bb4d2df32f56e1f1503e67eadca108fce4dfc708978c4b7830d82982e72f2f4e31dcc2859eeaed22d7db0a4a0b7475a8dd3747432231d048c58
SSDEEP 768:9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpX/NB:vLsF2Kerc64sTiX2IV0DhuX/NB
TLSH
T1C7F24B1A6AA16042E59314B0FDA91F34C47D9CB6217BB06BE7403A1928B2D57CF70FDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/456-14-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/860-0-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/860-12-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/1876-18-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/1876-19-0x0000000000400000-0x000000000041C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads