juko | 090289817fa12802a478f2ed6b260795582ce9651cb58f1b3d00b206b2cd4b29

General

Target
2026-05-25_55aebacfc0deeace5f98079c3d8ebab1_elex_wannacry.exe
Size 39KB
Sample260525-kdswxafw21
SHA256 090289817fa12802a478f2ed6b260795582ce9651cb58f1b3d00b206b2cd4b29
MD5 55aebacfc0deeace5f98079c3d8ebab1
SHA1 f73a121f4182f8696836f9f2f64721e53f397fe5
SHA512 4500b9cea1ba8f21510e2613903cd5ca772db0c458d8128a77772c175c5b6661330c10fb8bf5bcaae93e2f308c01e4d0b1330872f6f39bff96c77b89bb09d81e
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBD:aLsF2Kerc64sTiX2IV0DVyIGFc
TLSH
T1A8036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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 7 IoCs

resource	yara_rule
behavioral2/memory/5232-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001e00000002b416-5.dat	family_juko
behavioral2/memory/5232-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5348-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b61d-15.dat	family_juko
behavioral2/memory/4092-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4092-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5348	WINWORD.exe
4092	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-1-5-21-2824035265-2271499813-2042964211-1000\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	2026-05-25_55aebacfc0deeace5f98079c3d8ebab1_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
1056	cmd.exe
2312	PING.EXE
3060	PING.EXE
1516	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3060	PING.EXE
1516	PING.EXE
2312	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5232 wrote to memory of 5348	5232	2026-05-25_55aebacfc0deeace5f98079c3d8ebab1_elex_wannacry.exe	81
PID 5348 wrote to memory of 1056	5348	WINWORD.exe	82
PID 1056 wrote to memory of 2312	1056	cmd.exe	84
PID 1056 wrote to memory of 3060	1056	cmd.exe	85
PID 1056 wrote to memory of 1516	1056	cmd.exe	86
PID 1056 wrote to memory of 4092	1056	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-05-25_55aebacfc0deeace5f98079c3d8ebab1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-25_55aebacfc0deeace5f98079c3d8ebab1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5232
- 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:5348
- - 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\00005133" 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:1056
  - - 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:2312
  - - 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:3060
  - - 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:1516
  - - 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:4092

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

00005133

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005133
Size 39KB
SHA256 25700d2f4ad3189a9024ebd50e6d0c6fe703c819f0e590cc76fb0da13c5ee664
MD5 b9127861aa5b79d7f142a001ab65fa49
SHA1 599f1c771e9cce89212475e63046c346b5ba56cc
SHA512 c1211e9a44d7776da692aa6a0718e0cf7684e1ed5838ed5aff6a9616a160389a37a8f36e231232e338a95cab15ed3f9fbd88f42b866fd0ffa4f579c2caa05829
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBE:aLsF2Kerc64sTiX2IV0DVyIGFb
TLSH
T1EC036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 090289817fa12802a478f2ed6b260795582ce9651cb58f1b3d00b206b2cd4b29
MD5 55aebacfc0deeace5f98079c3d8ebab1
SHA1 f73a121f4182f8696836f9f2f64721e53f397fe5
SHA512 4500b9cea1ba8f21510e2613903cd5ca772db0c458d8128a77772c175c5b6661330c10fb8bf5bcaae93e2f308c01e4d0b1330872f6f39bff96c77b89bb09d81e
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBD:aLsF2Kerc64sTiX2IV0DVyIGFc
TLSH
T1A8036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4092-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4092-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5232-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5232-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5348-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads