juko | fe2da6f6741868925d0ad9edebc6879c10966003280506915d9a336bc11bd015

General

Target
2026-05-16_65cf3e59dc1f692891a38ac01790d2a9_elex_wannacry.exe
Size 49KB
Sample260516-jdsepsey4j
SHA256 fe2da6f6741868925d0ad9edebc6879c10966003280506915d9a336bc11bd015
MD5 65cf3e59dc1f692891a38ac01790d2a9
SHA1 05830c884dbbed0ffa9c0daf0c221fab56205a23
SHA512 ac65439146dbf711ccf6776f6a998fc6bf850959e5bffc12bff8dc28721ab67d5fe3b1120bbcc74f392a1eb716098239c6eb0cf16067e2f680520c1dbc2d3286
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2N:VLy2Kerc64CiGImVucp4kojWh2N
TLSH
T10A334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/1744-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000c000000023360-5.dat	family_juko
behavioral1/memory/1744-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3684-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00090000000243de-15.dat	family_juko
behavioral1/memory/3056-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3056-18-0x0000000000400000-0x0000000000420000-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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-05-16_65cf3e59dc1f692891a38ac01790d2a9_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3684	WINWORD.exe
3056	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-1-5-21-1074038928-2032447174-945360078-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-16_65cf3e59dc1f692891a38ac01790d2a9_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

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
5064	cmd.exe
1060	PING.EXE
1336	PING.EXE
2200	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1060	PING.EXE
1336	PING.EXE
2200	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1744 wrote to memory of 3684	1744	2026-05-16_65cf3e59dc1f692891a38ac01790d2a9_elex_wannacry.exe	84
PID 3684 wrote to memory of 5064	3684	WINWORD.exe	85
PID 5064 wrote to memory of 1060	5064	cmd.exe	87
PID 5064 wrote to memory of 1336	5064	cmd.exe	88
PID 5064 wrote to memory of 2200	5064	cmd.exe	89
PID 5064 wrote to memory of 3056	5064	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-05-16_65cf3e59dc1f692891a38ac01790d2a9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-16_65cf3e59dc1f692891a38ac01790d2a9_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1744
- 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:3684
- - 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\0000732B" 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:5064
  - - 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:1060
  - - 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:1336
  - - 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:2200
  - - 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:3056

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

0000732B

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000732B
Size 49KB
SHA256 8894b83a0087a47a300e1fb160f460b5e960a3c82ac2e2c9b018514c80e7243b
MD5 b8e860dd707344096d6b6d8025fc846c
SHA1 5b3df3e8b6389f6dcf2e65ee4c83d78da526843d
SHA512 41050c9108ba518cd96393931c1891d028c0d0010e967c2e5916eb98b9737619d037a855b83a6cce7ea67c0fb26a6bad6df8a80c5a76ad76d3df7c7fb5cbc577
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2S:VLy2Kerc64CiGImVucp4kojWh2S
TLSH
T1B2334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 fe2da6f6741868925d0ad9edebc6879c10966003280506915d9a336bc11bd015
MD5 65cf3e59dc1f692891a38ac01790d2a9
SHA1 05830c884dbbed0ffa9c0daf0c221fab56205a23
SHA512 ac65439146dbf711ccf6776f6a998fc6bf850959e5bffc12bff8dc28721ab67d5fe3b1120bbcc74f392a1eb716098239c6eb0cf16067e2f680520c1dbc2d3286
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2N:VLy2Kerc64CiGImVucp4kojWh2N
TLSH
T10A334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1744-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1744-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3056-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3056-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3684-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads