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
behavioral2/files/0x0013000000016db3-4.dat	family_juko
behavioral2/files/0x000d00000001c64b-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1772	WINWORD.exe
6076	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-1-5-21-3986082593-3624157295-3514260330-1000\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
5780	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	PING.EXE
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

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
1760	PING.EXE
4628	PING.EXE
5780	cmd.exe
4248	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4628	PING.EXE
4248	PING.EXE
1760	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3040 wrote to memory of 1772	3040	2026-08-30_2a337b991b134d4305ccfc13d3f5a2a2_elex_wannacry.exe	89
PID 1772 wrote to memory of 5780	1772	WINWORD.exe	90
PID 5780 wrote to memory of 4248	5780	cmd.exe	92
PID 5780 wrote to memory of 1760	5780	cmd.exe	93
PID 5780 wrote to memory of 4628	5780	cmd.exe	94
PID 5780 wrote to memory of 6076	5780	cmd.exe	95

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3040
- 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:1772
- - 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\00000396" 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:5780
  - - 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:4248
  - - 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:1760
  - - 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:4628
  - - 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:6076

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

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

00000396

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000396
Size 30KB
SHA256 048b87ba48da9798ce59a8abfd42773c92ec66c50e167607d8d12249055b5847
MD5 e9e65c8ecf48eb14d669a3052d4c0fac
SHA1 2e248c8e07f33ae782b904065e6ebafb423d5b51
SHA512 11953975f6f7fa2f6a09533ac4bb12840a167d78fe6f8b8dce80f4995991a81bcb7dfac2ed2453c089c68ba931350b4a8e4409746a3635a9cb53cf8a7c9a512c
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXS:tLsF2Kerc64sTiX2IV0DzloS
TLSH
T1E6E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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