juko | 3b7572a207cfa4eadfeee2dfb8ee6cc9003574799a7a8e3d998440682dc88649

General

Target
2026-06-28_eaeafd6e6ec0fa3b964cc874e81cdf17_elex_wannacry.exe
Size 42KB
Sample260628-wtak2saz9v
SHA256 3b7572a207cfa4eadfeee2dfb8ee6cc9003574799a7a8e3d998440682dc88649
MD5 eaeafd6e6ec0fa3b964cc874e81cdf17
SHA1 b837d1ef915eeafb200f73f450f2628b52e005a3
SHA512 8a34ebe787d0eba22221e4192c6a9737e6fa2c19d6bd2319295f50bf873834f032ff3110047c5c497bdda4a2372641a71a32aab5ad7677d7056209a6b349797f
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f411:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+m
TLSH
T13C13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
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
behavioral2/files/0x000700000001b861-4.dat	family_juko
behavioral2/files/0x001000000001c4e1-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1500	WINWORD.exe
4792	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-1-5-21-537605601-1362463912-856654178-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-06-28_eaeafd6e6ec0fa3b964cc874e81cdf17_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

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
1712	cmd.exe
5592	PING.EXE
4892	PING.EXE
4620	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4892	PING.EXE
4620	PING.EXE
5592	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1308 wrote to memory of 1500	1308	2026-06-28_eaeafd6e6ec0fa3b964cc874e81cdf17_elex_wannacry.exe	89
PID 1500 wrote to memory of 1712	1500	WINWORD.exe	90
PID 1712 wrote to memory of 5592	1712	cmd.exe	92
PID 1712 wrote to memory of 4892	1712	cmd.exe	93
PID 1712 wrote to memory of 4620	1712	cmd.exe	94
PID 1712 wrote to memory of 4792	1712	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-06-28_eaeafd6e6ec0fa3b964cc874e81cdf17_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-28_eaeafd6e6ec0fa3b964cc874e81cdf17_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1308
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1500
- - 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\00002B54" 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:1712
  - - 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:5592
  - - 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:4892
  - - 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:4620
  - - 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:4792

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00002B54

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002B54
Size 42KB
SHA256 463d384e1126e265e64ec26209f1385290df576160b6de6158e315df698ea981
MD5 c1b9735e83ce9a43e441193afa6e6487
SHA1 3e6c60b7910d9207109eeb10aa9050bc886d17ed
SHA512 9f2c42ba5ee93377352a8c559be7346de6abaf274b291a48da4a41a3e0eaf93d055bf5a8c4a37069aff508c6e02a45bee3c63f875c06b46877950ebceccaeee5
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41z:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+o
TLSH
T17513171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 3b7572a207cfa4eadfeee2dfb8ee6cc9003574799a7a8e3d998440682dc88649
MD5 eaeafd6e6ec0fa3b964cc874e81cdf17
SHA1 b837d1ef915eeafb200f73f450f2628b52e005a3
SHA512 8a34ebe787d0eba22221e4192c6a9737e6fa2c19d6bd2319295f50bf873834f032ff3110047c5c497bdda4a2372641a71a32aab5ad7677d7056209a6b349797f
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f411:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+m
TLSH
T13C13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
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