juko | c881a5e0c56a0c27a40906d73a74c84ddce459a2c27f8de4663ea740060a3ad5

General

Target
2026-05-29_46874d240f731b3fee80a97881d898d1_elex_wannacry.exe
Size 88KB
Sample260529-kar57sft6l
SHA256 c881a5e0c56a0c27a40906d73a74c84ddce459a2c27f8de4663ea740060a3ad5
MD5 46874d240f731b3fee80a97881d898d1
SHA1 59cb9aa87a6bec3d09dce09f8c26cca9687b7566
SHA512 11ab034adbcb42a89db53365ee5eb0deb2ad03b5fef9d1ee58f55dcf22f0a424f8971c2167c1649d74513b84d4e05191ad0575605286b6ae857e654e3c2c2ea0
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrZ:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193B
TLSH
T1B2934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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/0x0009000000000437-5.dat	family_juko
behavioral2/files/0x0012000000025a15-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3384	WINWORD.exe
716	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-1-5-21-1636999435-3883760687-346127294-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-29_46874d240f731b3fee80a97881d898d1_elex_wannacry.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
3048	PING.EXE
444	PING.EXE
3752	cmd.exe
4964	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
444	PING.EXE
4964	PING.EXE
3048	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1732 wrote to memory of 3384	1732	2026-05-29_46874d240f731b3fee80a97881d898d1_elex_wannacry.exe	80
PID 3384 wrote to memory of 3752	3384	WINWORD.exe	81
PID 3752 wrote to memory of 4964	3752	cmd.exe	83
PID 3752 wrote to memory of 3048	3752	cmd.exe	84
PID 3752 wrote to memory of 444	3752	cmd.exe	85
PID 3752 wrote to memory of 716	3752	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-29_46874d240f731b3fee80a97881d898d1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-29_46874d240f731b3fee80a97881d898d1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1732
- 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:3384
- - 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\00007431" 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:3752
  - - 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:4964
  - - 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:3048
  - - 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:444
  - - 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:716

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

00007431

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007431
Size 88KB
SHA256 c20676773ee81e43038987281bda9461ded50cae964eecc626ea5aca7fe703c2
MD5 e976f18342a4a1208c4145b066d62814
SHA1 44181a25dc33fefdcaf751c99d1d95099689af94
SHA512 b365bd010b88633644858c4bc7918c9501e9e84cec8ff6366808990cc89466d09a79b67ef15b424ee68f5897c4ba437dfdab70c2d8ae498ffec492717c51c44f
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrp:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193h
TLSH
T18C934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 c881a5e0c56a0c27a40906d73a74c84ddce459a2c27f8de4663ea740060a3ad5
MD5 46874d240f731b3fee80a97881d898d1
SHA1 59cb9aa87a6bec3d09dce09f8c26cca9687b7566
SHA512 11ab034adbcb42a89db53365ee5eb0deb2ad03b5fef9d1ee58f55dcf22f0a424f8971c2167c1649d74513b84d4e05191ad0575605286b6ae857e654e3c2c2ea0
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrZ:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193B
TLSH
T1B2934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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