juko | 49b95a6f04cb274df979459a36d9e1b1577d1aaac619525d9937ba7238f35efe

General

Target
2026-06-03_b8be21cd9684c806fca83723ffc1309b_elex_wannacry.exe
Size 47KB
Sample260603-efcd2sax8l
SHA256 49b95a6f04cb274df979459a36d9e1b1577d1aaac619525d9937ba7238f35efe
MD5 b8be21cd9684c806fca83723ffc1309b
SHA1 831284916dd2e0e1cb66446c9408e5e950af9f52
SHA512 42844316b67f038bf33bea78bd5e3e7367d91406447b68b2709231f343d82351093b4202ceb7a2c78f694a2d492e7382db231d283cfe99e911f6f74aad3256ee
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJ7:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxh
TLSH
T1B4235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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/0x000d000000028eb1-4.dat	family_juko
behavioral2/files/0x001a00000002b58c-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1068	WINWORD.exe
2524	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-1-5-21-1768642833-2142038154-4041560723-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-06-03_b8be21cd9684c806fca83723ffc1309b_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
5568	cmd.exe
432	PING.EXE
5564	PING.EXE
4908	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4908	PING.EXE
432	PING.EXE
5564	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2168 wrote to memory of 1068	2168	2026-06-03_b8be21cd9684c806fca83723ffc1309b_elex_wannacry.exe	79
PID 1068 wrote to memory of 5568	1068	WINWORD.exe	80
PID 5568 wrote to memory of 432	5568	cmd.exe	82
PID 5568 wrote to memory of 5564	5568	cmd.exe	83
PID 5568 wrote to memory of 4908	5568	cmd.exe	84
PID 5568 wrote to memory of 2524	5568	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-06-03_b8be21cd9684c806fca83723ffc1309b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-03_b8be21cd9684c806fca83723ffc1309b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2168
- 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:1068
- - 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\00004E68" 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:5568
  - - 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:432
  - - 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:5564
  - - 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:4908
  - - 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:2524

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

00004E68

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004E68
Size 47KB
SHA256 9f546bcdffe97b08a949800b367a9ed4a02da3db2451f9fd13180c59ecaa9828
MD5 f5e91ea3382812c449da4e564c424021
SHA1 6401b024367e3d5ae9dc89ffcd34f956c37919a8
SHA512 b9ebd23eb9a68d87a748d92f1cb01cbed5a62d5f65c7556cffef13faa124c46f03eca47aeb733723f21bcce97c28ca46258e485cc60e20c30febe5fe470fd500
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJH:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxh
TLSH
T1C9235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 49b95a6f04cb274df979459a36d9e1b1577d1aaac619525d9937ba7238f35efe
MD5 b8be21cd9684c806fca83723ffc1309b
SHA1 831284916dd2e0e1cb66446c9408e5e950af9f52
SHA512 42844316b67f038bf33bea78bd5e3e7367d91406447b68b2709231f343d82351093b4202ceb7a2c78f694a2d492e7382db231d283cfe99e911f6f74aad3256ee
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJ7:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxh
TLSH
T1B4235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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