juko | abb22c6457d4e095f8813d8aa01ae8c7e90cfbe6c3370e61e724fdfe75637bd4

General

Target
2026-06-30_6d3de521a9d2be138704de682cb47dec_elex_wannacry.exe
Size 88KB
Sample260701-e36leaet2r
SHA256 abb22c6457d4e095f8813d8aa01ae8c7e90cfbe6c3370e61e724fdfe75637bd4
MD5 6d3de521a9d2be138704de682cb47dec
SHA1 16221120f1d3628b9d8c704baced888e60650b62
SHA512 9cac8c39475d68c055c9d4b4964ec3a33e60ff20988ded693ede876a7cccb45a25c648e90f5e7edc51cd766282848417edbb59a8bd88d3509b18e8e544a5b2b6
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsp:zLy2Kerc64CiGImHc/28wzCBlycJWeei
TLSH
T1A7933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/1044-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5b0-5.dat	family_juko
behavioral2/memory/1044-10-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/3948-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c5b1-13.dat	family_juko
behavioral2/memory/1568-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/1568-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3948	WINWORD.exe
1568	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-1-5-21-2639994890-966400312-4246138405-1000\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	2026-06-30_6d3de521a9d2be138704de682cb47dec_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
5756	cmd.exe
2408	PING.EXE
5212	PING.EXE
1876	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2408	PING.EXE
5212	PING.EXE
1876	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1044 wrote to memory of 3948	1044	2026-06-30_6d3de521a9d2be138704de682cb47dec_elex_wannacry.exe	88
PID 3948 wrote to memory of 5756	3948	WINWORD.exe	89
PID 5756 wrote to memory of 2408	5756	cmd.exe	91
PID 5756 wrote to memory of 5212	5756	cmd.exe	92
PID 5756 wrote to memory of 1876	5756	cmd.exe	93
PID 5756 wrote to memory of 1568	5756	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-06-30_6d3de521a9d2be138704de682cb47dec_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-30_6d3de521a9d2be138704de682cb47dec_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1044
- 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:3948
- - 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\00006219" 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:5756
  - - 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:2408
  - - 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:5212
  - - 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:1876
  - - 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:1568

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

00006219

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006219
Size 88KB
SHA256 01c027acd15a4b1ba80143f508387e9767b38baf540cac11b9721ea5a871f86d
MD5 fa5b04e6f082289c4e166a3289df5ef5
SHA1 e903f311cf43b652b7ce25b067031f651e4408da
SHA512 fb716c4f1c0f2dd39dc82cc408958b2f3920103dbb7197d469aa1e1f4fb33d1990570eb49c93078edf88c119b1ae7d10a8a284c9d5620304fcf4a113536cdccb
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsx:zLy2Kerc64CiGImHc/28wzCBlycJWee6
TLSH
T133933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 abb22c6457d4e095f8813d8aa01ae8c7e90cfbe6c3370e61e724fdfe75637bd4
MD5 6d3de521a9d2be138704de682cb47dec
SHA1 16221120f1d3628b9d8c704baced888e60650b62
SHA512 9cac8c39475d68c055c9d4b4964ec3a33e60ff20988ded693ede876a7cccb45a25c648e90f5e7edc51cd766282848417edbb59a8bd88d3509b18e8e544a5b2b6
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsp:zLy2Kerc64CiGImHc/28wzCBlycJWeei
TLSH
T1A7933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1044-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/1044-10-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/1568-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/1568-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3948-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads