juko | d03482fedd6d62dbe0bf374c5642043f0f38b15cf91e6a9556a0c3ede5d97118

General

Target
2026-07-01_5c2a62cb90a63072d6508d729a9fd674_elex_wannacry.exe
Size 49KB
Sample260701-b85drad12v
SHA256 d03482fedd6d62dbe0bf374c5642043f0f38b15cf91e6a9556a0c3ede5d97118
MD5 5c2a62cb90a63072d6508d729a9fd674
SHA1 c1c7830d46753075dbcd30651bce14c9ded62861
SHA512 ed32195bedb635ebde76f0c74cfd8b75ba77ff509cb32c7de955503342f7ea792826279bc27bbd5cd9287bbbb1d9315e454128c160ca13abac1fa64159477fd2
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h20:VLy2Kerc64CiGImVu8p4kojWh20
TLSH
T1C5334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/1204-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0012000000019ca2-5.dat	family_juko
behavioral2/memory/1204-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4512-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001000000001c55b-13.dat	family_juko
behavioral2/memory/1992-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1992-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4512	WINWORD.exe
1992	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-1-5-21-3704578903-1610922810-1098216751-1000\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	2026-07-01_5c2a62cb90a63072d6508d729a9fd674_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
2920	cmd.exe
3128	PING.EXE
4456	PING.EXE
3932	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3128	PING.EXE
4456	PING.EXE
3932	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1204 wrote to memory of 4512	1204	2026-07-01_5c2a62cb90a63072d6508d729a9fd674_elex_wannacry.exe	88
PID 4512 wrote to memory of 2920	4512	WINWORD.exe	89
PID 2920 wrote to memory of 3128	2920	cmd.exe	91
PID 2920 wrote to memory of 4456	2920	cmd.exe	92
PID 2920 wrote to memory of 3932	2920	cmd.exe	93
PID 2920 wrote to memory of 1992	2920	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-01_5c2a62cb90a63072d6508d729a9fd674_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-01_5c2a62cb90a63072d6508d729a9fd674_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1204
- 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:4512
- - 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\00006258" 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:2920
  - - 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:3128
  - - 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:4456
  - - 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:3932
  - - 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:1992

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

00006258

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006258
Size 49KB
SHA256 1214e30ff96de3f74c0ef13ade60d4166bfbc8f2815eeede6d712b50a2e20185
MD5 0917c8ba336341fcca54dabc8f5b8dbc
SHA1 6ed7c1e5c868d009a17380250443c0ee2bee0353
SHA512 29aa4fe849de2793b4f4c85dcd29bb57dd78b78619e3b324fd95838b15e2edcde31f873a823fa23d564cb2eb7511f3ae8a209513b31199d5ecb105d47879324b
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2X:VLy2Kerc64CiGImVu8p4kojWh2X
TLSH
T1DE334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 d03482fedd6d62dbe0bf374c5642043f0f38b15cf91e6a9556a0c3ede5d97118
MD5 5c2a62cb90a63072d6508d729a9fd674
SHA1 c1c7830d46753075dbcd30651bce14c9ded62861
SHA512 ed32195bedb635ebde76f0c74cfd8b75ba77ff509cb32c7de955503342f7ea792826279bc27bbd5cd9287bbbb1d9315e454128c160ca13abac1fa64159477fd2
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h20:VLy2Kerc64CiGImVu8p4kojWh20
TLSH
T1C5334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1204-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1204-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1992-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1992-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4512-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads