juko | 5003da99763d4bd8724e9aed298c037880b94e5846dc3ab7430d367ac5a9e177

General

Target
2026-07-23_27dd275ff12e96ab3909fe01c183cec9_elex_wannacry.exe
Size 48KB
Sample260723-ym4awsch98
SHA256 5003da99763d4bd8724e9aed298c037880b94e5846dc3ab7430d367ac5a9e177
MD5 27dd275ff12e96ab3909fe01c183cec9
SHA1 6b29995d5acdd63e5a4c9713d14998504e56853d
SHA512 45817cd56cbef16ba80ba01884b31d4c3cc9c19d448989c1e1595b2ce27f3c3466c7425f164c6c08c694e46df6ef9dc9ef6e676c33c743b1ec2609b5e60273f9
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v83:bLy2Kerc64CiGImav42j0f
TLSH
T191234A2EB5A26068C55390B0E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
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/4708-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000f0000000231e4-5.dat	family_juko
behavioral1/memory/4708-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/5304-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0008000000024656-15.dat	family_juko
behavioral1/memory/1720-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1720-18-0x0000000000400000-0x0000000000420000-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-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-07-23_27dd275ff12e96ab3909fe01c183cec9_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5304	WINWORD.exe
1720	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-1-5-21-3053180483-1881419501-3594244048-1000\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
5000	cmd.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	2026-07-23_27dd275ff12e96ab3909fe01c183cec9_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
5000	cmd.exe
3540	PING.EXE
1520	PING.EXE
3924	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3540	PING.EXE
1520	PING.EXE
3924	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4708 wrote to memory of 5304	4708	2026-07-23_27dd275ff12e96ab3909fe01c183cec9_elex_wannacry.exe	87
PID 5304 wrote to memory of 5000	5304	WINWORD.exe	88
PID 5000 wrote to memory of 3540	5000	cmd.exe	90
PID 5000 wrote to memory of 1520	5000	cmd.exe	91
PID 5000 wrote to memory of 3924	5000	cmd.exe	92
PID 5000 wrote to memory of 1720	5000	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-23_27dd275ff12e96ab3909fe01c183cec9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-23_27dd275ff12e96ab3909fe01c183cec9_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4708
- 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:5304
- - 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\00002550" 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:5000
  - - 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:3540
  - - 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:1520
  - - 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:3924
  - - 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:1720

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00002550

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002550
Size 48KB
SHA256 d77f52ccdeddd16b0163dc223e50982edd9de3a391941c4178975e7cf98d0440
MD5 56563a20500727d953cb91b8f3706516
SHA1 1135a1d945969257b40e982da2cc66e9607cfe08
SHA512 dc8bd1e6140efc5ee872c16acb6ef5cef050ea41f5d7782f5301c3c17ded3e2fb3c1f2b1172c654fddc39bc45e5fbbe026ecd828aa9113f841b7591e5f537b76
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8P:bLy2Kerc64CiGImav42j0X
TLSH
T1E7234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 5003da99763d4bd8724e9aed298c037880b94e5846dc3ab7430d367ac5a9e177
MD5 27dd275ff12e96ab3909fe01c183cec9
SHA1 6b29995d5acdd63e5a4c9713d14998504e56853d
SHA512 45817cd56cbef16ba80ba01884b31d4c3cc9c19d448989c1e1595b2ce27f3c3466c7425f164c6c08c694e46df6ef9dc9ef6e676c33c743b1ec2609b5e60273f9
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v83:bLy2Kerc64CiGImav42j0f
TLSH
T191234A2EB5A26068C55390B0E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1720-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1720-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4708-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4708-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5304-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads