juko | 3dcb3516d53cfe1296c8001db7c8d419de8b012cbbe7aa61d93a9547e5a736a0

General

Target
2026-08-30_2a337b991b134d4305ccfc13d3f5a2a2_elex_wannacry.exe
Size 30KB
Sample260830-yybd9ayeqe
SHA256 3dcb3516d53cfe1296c8001db7c8d419de8b012cbbe7aa61d93a9547e5a736a0
MD5 2a337b991b134d4305ccfc13d3f5a2a2
SHA1 f74dec595e29f1a4cbce4542c7d141d578bf2de8
SHA512 9d5bcff140f252d834ad35637b10fadf855ce72894a7d4e9f8920aefd5b2eb8c5ec2f57f9261f94bcd38f972df54e6aa4a7f8cc9547dc74d6dd73ce65035d807
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX1:tLsF2Kerc64sTiX2IV0Dzlo1
TLSH
T1A0E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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 2 IoCs

resource	yara_rule
behavioral1/files/0x00130000000243fc-4.dat	family_juko
behavioral1/files/0x000900000002447e-9.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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-08-30_2a337b991b134d4305ccfc13d3f5a2a2_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4800	WINWORD.exe
1368	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-1-5-21-668679576-120646659-2289335452-1000\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
3096	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 6 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	2026-08-30_2a337b991b134d4305ccfc13d3f5a2a2_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
972	PING.EXE
3372	PING.EXE
3096	cmd.exe
2292	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2292	PING.EXE
972	PING.EXE
3372	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3900 wrote to memory of 4800	3900	2026-08-30_2a337b991b134d4305ccfc13d3f5a2a2_elex_wannacry.exe	87
PID 4800 wrote to memory of 3096	4800	WINWORD.exe	88
PID 3096 wrote to memory of 2292	3096	cmd.exe	90
PID 3096 wrote to memory of 972	3096	cmd.exe	91
PID 3096 wrote to memory of 3372	3096	cmd.exe	92
PID 3096 wrote to memory of 1368	3096	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-30_2a337b991b134d4305ccfc13d3f5a2a2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-30_2a337b991b134d4305ccfc13d3f5a2a2_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3900
- 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:4800
- - 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\00004287" 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:3096
  - - 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:2292
  - - 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:972
  - - 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:3372
  - - 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
      PID:1368

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

00004287

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004287
Size 30KB
SHA256 ba12cb3888388cdd7cc8c9fd6b0f50a650092a569212a633ef9970284a43437d
MD5 f1ef2d2d319037c48eee2c9a9490c759
SHA1 3c64825d1953730de2c7803957bf16326af488d7
SHA512 8fa8f37c7e20bf92915835db82a0859ed533fae5a778ea8799cdc23897111f4125b9f189139f89c2aa5b77c891bb489981bdd19462e49946b426b2dd38739d93
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXB:tLsF2Kerc64sTiX2IV0DzloB
TLSH
T1BFE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 3dcb3516d53cfe1296c8001db7c8d419de8b012cbbe7aa61d93a9547e5a736a0
MD5 2a337b991b134d4305ccfc13d3f5a2a2
SHA1 f74dec595e29f1a4cbce4542c7d141d578bf2de8
SHA512 9d5bcff140f252d834ad35637b10fadf855ce72894a7d4e9f8920aefd5b2eb8c5ec2f57f9261f94bcd38f972df54e6aa4a7f8cc9547dc74d6dd73ce65035d807
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX1:tLsF2Kerc64sTiX2IV0Dzlo1
TLSH
T1A0E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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