juko | 4125534ee5b67b6b6b90f612d9701e34234fed70b2d9eacf6cdf52099f92991d

General

Target
2026-05-05_9be535b83bcda0f2bba8e3026f3c3854_elex_wannacry.exe
Size 64KB
Sample260505-jpvdfaaz3x
SHA256 4125534ee5b67b6b6b90f612d9701e34234fed70b2d9eacf6cdf52099f92991d
MD5 9be535b83bcda0f2bba8e3026f3c3854
SHA1 e4c26bb786d10df0f7728e719519d28b107b47c3
SHA512 130823c7d522cc1d5360b715709a7b309ba814eba1f5966d2c928e75b22268877a7c63d5b3a6c0ab0e5ca21157b432d9a31c5f1a62f7327f59b74b5cb7affbcc
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uS:sLy2Kerc64CiGIm8so28S
TLSH
T114535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/0x0009000000022e76-4.dat	family_juko
behavioral1/files/0x0009000000024296-12.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-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	2026-05-05_9be535b83bcda0f2bba8e3026f3c3854_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1524	WINWORD.exe
640	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-1-5-21-2714754311-527593155-1440850301-1000\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

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	2026-05-05_9be535b83bcda0f2bba8e3026f3c3854_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
4336	cmd.exe
3768	PING.EXE
1664	PING.EXE
8	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3768	PING.EXE
1664	PING.EXE
8	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4172 wrote to memory of 1524	4172	2026-05-05_9be535b83bcda0f2bba8e3026f3c3854_elex_wannacry.exe	84
PID 1524 wrote to memory of 4336	1524	WINWORD.exe	85
PID 4336 wrote to memory of 3768	4336	cmd.exe	87
PID 4336 wrote to memory of 1664	4336	cmd.exe	88
PID 4336 wrote to memory of 8	4336	cmd.exe	89
PID 4336 wrote to memory of 640	4336	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-05-05_9be535b83bcda0f2bba8e3026f3c3854_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_9be535b83bcda0f2bba8e3026f3c3854_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4172
- 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:1524
- - 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\00005968" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4336
  - - 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:3768
  - - 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:1664
  - - 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:8
  - - 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
      System Location Discovery: System Language Discovery
      PID:640

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00005968

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005968
Size 64KB
SHA256 dcdcc803d75b23fc7b2116d2652e0782dc236faca248e69e7f86fca963049d69
MD5 bceadb8cad8290e947b78a068499138d
SHA1 d85ef1626cfddec758490a94d70782d474a1b8df
SHA512 9d9ce35d2e7e1798404186c133cb6bb9a66c631bc1b24b2ed63ae072369720d0b58186217d7e28d35d5938470e2d5336df123579073b078e005305060d3994cc
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uf:sLy2Kerc64CiGIm8so28f
TLSH
T1AF535C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 4125534ee5b67b6b6b90f612d9701e34234fed70b2d9eacf6cdf52099f92991d
MD5 9be535b83bcda0f2bba8e3026f3c3854
SHA1 e4c26bb786d10df0f7728e719519d28b107b47c3
SHA512 130823c7d522cc1d5360b715709a7b309ba814eba1f5966d2c928e75b22268877a7c63d5b3a6c0ab0e5ca21157b432d9a31c5f1a62f7327f59b74b5cb7affbcc
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uS:sLy2Kerc64CiGIm8so28S
TLSH
T114535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/640-14-0x0000000002A60000-0x0000000002AC3000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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