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 8 IoCs

resource	yara_rule
behavioral1/memory/1248-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x000b0000000242fc-5.dat	family_juko
behavioral1/memory/1248-13-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/2300-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/2300-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x00080000000244fd-16.dat	family_juko
behavioral1/memory/4836-18-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/4836-19-0x0000000000400000-0x000000000042A000-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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-06-30_6d3de521a9d2be138704de682cb47dec_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2300	WINWORD.exe
4836	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-1-5-21-668679576-120646659-2289335452-1000\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	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	2026-06-30_6d3de521a9d2be138704de682cb47dec_elex_wannacry.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
5028	PING.EXE
1808	PING.EXE
4972	PING.EXE
4048	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5028	PING.EXE
1808	PING.EXE
4972	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1248 wrote to memory of 2300	1248	2026-06-30_6d3de521a9d2be138704de682cb47dec_elex_wannacry.exe	86
PID 2300 wrote to memory of 4048	2300	WINWORD.exe	87
PID 4048 wrote to memory of 5028	4048	cmd.exe	89
PID 4048 wrote to memory of 1808	4048	cmd.exe	90
PID 4048 wrote to memory of 4972	4048	cmd.exe	93
PID 4048 wrote to memory of 4836	4048	cmd.exe	96

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1248
- 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:2300
- - 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\000031B4" 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:4048
  - - 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:5028
  - - 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:1808
  - - 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:4972
  - - 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:4836

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

000031B4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000031B4
Size 88KB
SHA256 92989100996adf4aeeb6be57a4c4bc4fdec95c78e6c5d16c46495b564943b98b
MD5 a03282a26542484339672d3906c783d7
SHA1 cc8f0ec964a0f95fa4b8feb4cbe8cfd816ca4848
SHA512 4caeb8f277295d0393dc96f2296a1fbe2240bed4ae9755d4b19510092f6637774b92a383d4f2f5964090b9fcd3097e224e080ebac60cf4847cd66e7b0207e511
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsa:zLy2Kerc64CiGImHc/28wzCBlycJWeeF
TLSH
T1C3933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/1248-0-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/1248-13-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/2300-12-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/2300-15-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4836-18-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4836-19-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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