juko | 4e9c8cbed4b770401bfe6fe87e7279ccf7a697dae3b72dac31edf78ea2d699aa

General

Target
2026-05-09_df5b0b516c5f93531e8cb469b598399a_elex_wannacry.exe
Size 47KB
Sample260510-ap6xssh16p
SHA256 4e9c8cbed4b770401bfe6fe87e7279ccf7a697dae3b72dac31edf78ea2d699aa
MD5 df5b0b516c5f93531e8cb469b598399a
SHA1 2f78b7622e8c3988ac74d5d690f0f0b2ac2729ce
SHA512 7bebc0a1a9a0c9a75db7874115f71781cf2d0e8c4d7fbe9eb3378213133d80a3619fc3f018b30725fc7987b7f050189b3cd1d23ecbfbdd3df72c099851ffebe0
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJE:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxC
TLSH
T105235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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/0x002c00000002b1d7-4.dat	family_juko
behavioral2/files/0x001a00000002b45d-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4124	WINWORD.exe
3376	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	2026-05-09_df5b0b516c5f93531e8cb469b598399a_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
4512	PING.EXE
3012	PING.EXE
728	PING.EXE
468	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4512	PING.EXE
3012	PING.EXE
728	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1720 wrote to memory of 4124	1720	2026-05-09_df5b0b516c5f93531e8cb469b598399a_elex_wannacry.exe	80
PID 4124 wrote to memory of 468	4124	WINWORD.exe	81
PID 468 wrote to memory of 4512	468	cmd.exe	83
PID 468 wrote to memory of 3012	468	cmd.exe	84
PID 468 wrote to memory of 728	468	cmd.exe	85
PID 468 wrote to memory of 3376	468	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-09_df5b0b516c5f93531e8cb469b598399a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-09_df5b0b516c5f93531e8cb469b598399a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1720
- 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:4124
- - 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\000005B4" 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:468
  - - 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:4512
  - - 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:3012
  - - 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:728
  - - 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:3376

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

000005B4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000005B4
Size 47KB
SHA256 2d4392ee26358ed581f9c6f12caeb5f02419933e125c1e4e6d6a24bb970fda60
MD5 3394ce65a71898c695aeff32d2c375ce
SHA1 e55e73af4c97e0c99ee96ad38efa65499e37f8a5
SHA512 028a0f60050cde0e0f5f6ca8d3c2b6f2b4d6c08906660e83656d3cab549f0a05e0b19b9cb8365884f476d3176cbc7d7d86dec26d268585d611779b6f73f00578
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJn:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxd
TLSH
T193235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 4e9c8cbed4b770401bfe6fe87e7279ccf7a697dae3b72dac31edf78ea2d699aa
MD5 df5b0b516c5f93531e8cb469b598399a
SHA1 2f78b7622e8c3988ac74d5d690f0f0b2ac2729ce
SHA512 7bebc0a1a9a0c9a75db7874115f71781cf2d0e8c4d7fbe9eb3378213133d80a3619fc3f018b30725fc7987b7f050189b3cd1d23ecbfbdd3df72c099851ffebe0
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJE:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxC
TLSH
T105235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1720-11-0x0000000000970000-0x00000000009EB000-memory.dmp

Download

memory/3376-16-0x0000000000970000-0x00000000009EB000-memory.dmp

Download

memory/4124-13-0x0000000000630000-0x00000000006AB000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads