juko | 1fde00591af468abbe113f3aa5c4ecf0bc80d8864279b9bb76afbd09b5037e0d

General

Target
2026-05-22_f6d1b546bd5a7b4d529a6c8c51e45284_elex_wannacry.exe
Size 49KB
Sample260522-xfla3adv2r
SHA256 1fde00591af468abbe113f3aa5c4ecf0bc80d8864279b9bb76afbd09b5037e0d
MD5 f6d1b546bd5a7b4d529a6c8c51e45284
SHA1 bccb240ca310296610b668c695c07eef68ec2de8
SHA512 136ba30ae7e8db2e55bf0e92142c5aa9a3b65b6520fc0c026720126689c8bdf68a2ac2fcb354dc57ef37adca4b4c5aa33afbf59ce37398c97a2ceab5d24b2c4c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2h:VLy2Kerc64CiGImVucp4kojWh2h
TLSH
T129334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/2168-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d000000028eb1-5.dat	family_juko
behavioral2/memory/2168-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1068-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b58c-15.dat	family_juko
behavioral2/memory/2456-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2456-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1068	WINWORD.exe
2456	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-1-5-21-1768642833-2142038154-4041560723-1000\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	2026-05-22_f6d1b546bd5a7b4d529a6c8c51e45284_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
3948	cmd.exe
1052	PING.EXE
4736	PING.EXE
4920	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1052	PING.EXE
4736	PING.EXE
4920	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2168 wrote to memory of 1068	2168	2026-05-22_f6d1b546bd5a7b4d529a6c8c51e45284_elex_wannacry.exe	79
PID 1068 wrote to memory of 3948	1068	WINWORD.exe	80
PID 3948 wrote to memory of 1052	3948	cmd.exe	82
PID 3948 wrote to memory of 4736	3948	cmd.exe	83
PID 3948 wrote to memory of 4920	3948	cmd.exe	84
PID 3948 wrote to memory of 2456	3948	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-22_f6d1b546bd5a7b4d529a6c8c51e45284_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-22_f6d1b546bd5a7b4d529a6c8c51e45284_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2168
- 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:1068
- - 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\00005099" 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:3948
  - - 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:1052
  - - 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:4736
  - - 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:4920
  - - 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:2456

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

00005099

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005099
Size 49KB
SHA256 5b3949cf4683ecf86cc5193ecf2d1af95cde36d69388ec2dae7493e38270f36b
MD5 a6a8e3fd3af87883cca1f314ea66fb80
SHA1 3bbb7531993f077400cb11732e1e528ca8bece16
SHA512 6f73417f432ccf24f1c8219d7406bb0b663b073103526ad85d694d4ffceb272cc7cafefed4ec6d85157182490ad62af1e57cd656afb505142b061a6fa69cd568
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2w:VLy2Kerc64CiGImVucp4kojWh2w
TLSH
T139334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 1fde00591af468abbe113f3aa5c4ecf0bc80d8864279b9bb76afbd09b5037e0d
MD5 f6d1b546bd5a7b4d529a6c8c51e45284
SHA1 bccb240ca310296610b668c695c07eef68ec2de8
SHA512 136ba30ae7e8db2e55bf0e92142c5aa9a3b65b6520fc0c026720126689c8bdf68a2ac2fcb354dc57ef37adca4b4c5aa33afbf59ce37398c97a2ceab5d24b2c4c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2h:VLy2Kerc64CiGImVucp4kojWh2h
TLSH
T129334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1068-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2168-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2168-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2456-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2456-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads