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
behavioral1/memory/6040-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00110000000231f3-5.dat	family_juko
behavioral1/memory/6040-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1992-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0002000000022cbb-15.dat	family_juko
behavioral1/memory/632-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/632-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-05-25_55aebacfc0deeace5f98079c3d8ebab1_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1992	WINWORD.exe
632	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-1-5-21-3053180483-1881419501-3594244048-1000\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	2026-05-25_55aebacfc0deeace5f98079c3d8ebab1_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
3808	PING.EXE
3488	cmd.exe
5220	PING.EXE
3724	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3724	PING.EXE
3808	PING.EXE
5220	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6040 wrote to memory of 1992	6040	2026-05-25_55aebacfc0deeace5f98079c3d8ebab1_elex_wannacry.exe	89
PID 1992 wrote to memory of 3488	1992	WINWORD.exe	90
PID 3488 wrote to memory of 5220	3488	cmd.exe	92
PID 3488 wrote to memory of 3724	3488	cmd.exe	93
PID 3488 wrote to memory of 3808	3488	cmd.exe	94
PID 3488 wrote to memory of 632	3488	cmd.exe	95

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6040
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1992
- - 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\00005856" 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:3488
  - - 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:5220
  - - 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:3724
  - - 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:3808
  - - 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:632

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00005856

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005856
Size 39KB
SHA256 d8cdc6ccee73e8da7d8f27c9e4b974763848da9639f50172f81ed2db980fa66a
MD5 abdb2b04b687bfb5eaa4c4eeb434c17d
SHA1 90fc9e00ee7330380701384830d47e6c95f2051d
SHA512 9ff8e76336e656cf53bbc3a11e37942888edd67f45387522232ea2e0b48b0c1c051247f300f9f65bb0938dd66c73a310a051376e94882c3b0cd2c8641d4b0d35
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBx:aLsF2Kerc64sTiX2IV0DVyIGFS
TLSH
T12D036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/632-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/632-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1992-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6040-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6040-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads