juko | 47bc04514f33e93dc2d3300680f4234b9dab08f9a88cea33e2f2e7b5770048a7

General

Target
2026-09-21_16e81715e5f9792baa9d8abbbf174637_elex_wannacry.exe
Size 32KB
Sample260922-ef6ynaxcpe
SHA256 47bc04514f33e93dc2d3300680f4234b9dab08f9a88cea33e2f2e7b5770048a7
MD5 16e81715e5f9792baa9d8abbbf174637
SHA1 9353cc3b0e473ae92cf6495ce05ee95c919c104c
SHA512 336aee52651ba5d1749c589eff5273c2b607d65a22287591425f56566e7cb4c75e56261d8f989c61b177e9ab62b598f461cdde6360bc4282cdb0870a776ab35f
SSDEEP 768:RZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqbNPWQHJnW:bLsF2Kerc64sTiX2IV0DEanW
TLSH
T105E22B2B2AA57052C59320B0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ECE
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/0x000700000001b85c-4.dat	family_juko
behavioral2/files/0x000e00000001c48a-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4940	WINWORD.exe
3516	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-1-5-21-1262770251-41185387-1005173349-1000\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
4664	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-21_16e81715e5f9792baa9d8abbbf174637_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
4664	cmd.exe
2380	PING.EXE
2768	PING.EXE
4688	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2380	PING.EXE
2768	PING.EXE
4688	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2900 wrote to memory of 4940	2900	2026-09-21_16e81715e5f9792baa9d8abbbf174637_elex_wannacry.exe	90
PID 4940 wrote to memory of 4664	4940	WINWORD.exe	91
PID 4664 wrote to memory of 2380	4664	cmd.exe	93
PID 4664 wrote to memory of 2768	4664	cmd.exe	94
PID 4664 wrote to memory of 4688	4664	cmd.exe	95
PID 4664 wrote to memory of 3516	4664	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-09-21_16e81715e5f9792baa9d8abbbf174637_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-21_16e81715e5f9792baa9d8abbbf174637_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2900
- 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:4940
- - 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\000004FD" 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:4664
  - - 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:2380
  - - 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:2768
  - - 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:4688
  - - 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:3516

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

000004FD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000004FD
Size 32KB
SHA256 4b5a0f82aa2e8f4127ccb8d6cdb39e59242f942052a44d481023469d6d930350
MD5 e24394cbba87d054030933e930f180a4
SHA1 357ae94529022a81f48e3b1cf4ce0b1f21785631
SHA512 5c05108f39c49a968fb37064378f60441eb4b418a08668bc8f1ea7824b7e66526e99e2e686479074af808a28ef814640e55da0a0b62609bbe26c15c9ebbe9eea
SSDEEP 768:RZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqbNPWQHJnj:bLsF2Kerc64sTiX2IV0DEanj
TLSH
T1DDE22A2B2AA57052C59320B0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 47bc04514f33e93dc2d3300680f4234b9dab08f9a88cea33e2f2e7b5770048a7
MD5 16e81715e5f9792baa9d8abbbf174637
SHA1 9353cc3b0e473ae92cf6495ce05ee95c919c104c
SHA512 336aee52651ba5d1749c589eff5273c2b607d65a22287591425f56566e7cb4c75e56261d8f989c61b177e9ab62b598f461cdde6360bc4282cdb0870a776ab35f
SSDEEP 768:RZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqbNPWQHJnW:bLsF2Kerc64sTiX2IV0DEanW
TLSH
T105E22B2B2AA57052C59320B0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ECE
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