juko | 8a4da43444f24fd98b6f5756ca37d9c95db33cde28eacdb9341c188b3cb354ff

General

Target
2026-10-26_50d19bd87daa7f81a5db847c61aa6b9e_elex_wannacry.exe
Size 49KB
Sample261027-v8ctaaez2x
SHA256 8a4da43444f24fd98b6f5756ca37d9c95db33cde28eacdb9341c188b3cb354ff
MD5 50d19bd87daa7f81a5db847c61aa6b9e
SHA1 fa7af76f5444c2c1f5a56e2d144fe90545e1f72d
SHA512 22597d0af8080091b641be4dc0f76d6fc9518e0e568ac6e30e0c69133ac5606e366ab4d521c87358117c71bb76abe5f254eb4b7aa2f75f283b5355ca8dca2613
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2h:VLy2Kerc64CiGImVu8p4kojWh2h
TLSH
T126334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4284-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00080000000004e8-4.dat	family_juko
behavioral1/memory/4284-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3512-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000c0000000210c6-15.dat	family_juko
behavioral1/memory/2916-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2916-19-0x0000000000400000-0x0000000000420000-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-1-5-21-939655444-3071939294-1401108526-1000\Control Panel\International\Geo\Nation	2026-10-26_50d19bd87daa7f81a5db847c61aa6b9e_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
3512	WINWORD.exe
2916	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
1004	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	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	2026-10-26_50d19bd87daa7f81a5db847c61aa6b9e_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

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
3408	PING.EXE
1004	cmd.exe
1988	PING.EXE
1032	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3408	PING.EXE
1988	PING.EXE
1032	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4284 wrote to memory of 3512	4284	2026-10-26_50d19bd87daa7f81a5db847c61aa6b9e_elex_wannacry.exe	85
PID 3512 wrote to memory of 1004	3512	WINWORD.exe	86
PID 1004 wrote to memory of 1988	1004	cmd.exe	88
PID 1004 wrote to memory of 1032	1004	cmd.exe	91
PID 1004 wrote to memory of 3408	1004	cmd.exe	94
PID 1004 wrote to memory of 2916	1004	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-26_50d19bd87daa7f81a5db847c61aa6b9e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_50d19bd87daa7f81a5db847c61aa6b9e_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4284
- 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:3512
- - 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\0000301D" 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:1004
  - - 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:1988
  - - 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:1032
  - - 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:3408
  - - 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:2916

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

0000301D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000301D
Size 49KB
SHA256 de1e00ab3a0294ce97428a036fa0fcf8c77e1a944b27ea23ded720dd409393bf
MD5 8b91e3cb1eacaf13d303ec588069d625
SHA1 b2598dc4762b7fc72c709ecadf26d7f629c4288c
SHA512 350e22d42a8b910c3fd389574b0a91fbd5fe4b4af7ab594ee4d10bec640b79037fd1c4e5dfa7859b2b573da68e07cbf11f1baadb08d58af8c39bdd62351d128a
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2U:VLy2Kerc64CiGImVu8p4kojWh2U
TLSH
T1CA334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 8a4da43444f24fd98b6f5756ca37d9c95db33cde28eacdb9341c188b3cb354ff
MD5 50d19bd87daa7f81a5db847c61aa6b9e
SHA1 fa7af76f5444c2c1f5a56e2d144fe90545e1f72d
SHA512 22597d0af8080091b641be4dc0f76d6fc9518e0e568ac6e30e0c69133ac5606e366ab4d521c87358117c71bb76abe5f254eb4b7aa2f75f283b5355ca8dca2613
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2h:VLy2Kerc64CiGImVu8p4kojWh2h
TLSH
T126334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2916-18-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2916-19-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3512-14-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4284-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4284-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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