juko | 8110c5f38f7024a52b5d0afe335c74f0e9ecc2488065de811ae76e71914549e6

General

Target
2026-05-07_c3fb5035830af15c84fe4533fcbc92be_elex_wannacry.exe
Size 30KB
Sample260507-n1lynagy6m
SHA256 8110c5f38f7024a52b5d0afe335c74f0e9ecc2488065de811ae76e71914549e6
MD5 c3fb5035830af15c84fe4533fcbc92be
SHA1 9ca0a70141b9d9dfc5a2d304946d71e50225fc42
SHA512 7742d21ddda5cb9bb900cef002e0aab71cccb26d8a5173de5bd0ee08d5fa91d6297b67ce39e2595dcbf6a7c9d563a1a7aae90e5644ce65ccb76f92580fce045e
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXq:tLsF2Kerc64sTiX2IV0Dzloq
TLSH
T11EE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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/0x003300000002b13e-4.dat	family_juko
behavioral2/files/0x001b00000002b33b-11.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1956	WINWORD.exe
3316	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-1-5-21-1383858298-2057492509-1726743289-1000\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	2026-05-07_c3fb5035830af15c84fe4533fcbc92be_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
3596	PING.EXE
3252	PING.EXE
3320	PING.EXE
484	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3596	PING.EXE
3252	PING.EXE
3320	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4104 wrote to memory of 1956	4104	2026-05-07_c3fb5035830af15c84fe4533fcbc92be_elex_wannacry.exe	80
PID 1956 wrote to memory of 484	1956	WINWORD.exe	81
PID 484 wrote to memory of 3596	484	cmd.exe	83
PID 484 wrote to memory of 3252	484	cmd.exe	84
PID 484 wrote to memory of 3320	484	cmd.exe	85
PID 484 wrote to memory of 3316	484	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-07_c3fb5035830af15c84fe4533fcbc92be_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-07_c3fb5035830af15c84fe4533fcbc92be_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4104
- 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:1956
- - 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\000040EF" 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:484
  - - 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:3596
  - - 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:3252
  - - 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:3320
  - - 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:3316

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

Replay Monitor

Loading Replay Monitor...

Downloads

000040EF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000040EF
Size 30KB
SHA256 0346e0db5a55cf0e4a482570c0f162ca6ec4bd5577c7812a530532fbb1aab46f
MD5 f092c06cddae52c166398b1db6c8b857
SHA1 1f89ec4457fd776996406d4a0dff86f12298d8a8
SHA512 2c1888c02aaad724edf2169b3e5a9840490e803be10ccbcc24cc14e46e1a7763bcd434a7ab7d54728f1ea1ff7ed0b8f9cb8d4897d040790b3003e765490679f8
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXQ:tLsF2Kerc64sTiX2IV0DzloQ
TLSH
T1D5E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 8110c5f38f7024a52b5d0afe335c74f0e9ecc2488065de811ae76e71914549e6
MD5 c3fb5035830af15c84fe4533fcbc92be
SHA1 9ca0a70141b9d9dfc5a2d304946d71e50225fc42
SHA512 7742d21ddda5cb9bb900cef002e0aab71cccb26d8a5173de5bd0ee08d5fa91d6297b67ce39e2595dcbf6a7c9d563a1a7aae90e5644ce65ccb76f92580fce045e
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXq:tLsF2Kerc64sTiX2IV0Dzloq
TLSH
T11EE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1956-10-0x00000000005B0000-0x00000000005D5000-memory.dmp

Download

memory/3316-13-0x0000000000B90000-0x0000000000BB5000-memory.dmp

Download

memory/4104-7-0x0000000000B90000-0x0000000000BB5000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads