juko | 23a350cbad592dc7f4035cd269f8628ee8f52ca92c64bc3f4002fe298024b58a

General

Target
2026-05-07_933d66bb1e3bf3eada10c96ed023e337_elex_wannacry.exe
Size 49KB
Sample260507-c716daes3x
SHA256 23a350cbad592dc7f4035cd269f8628ee8f52ca92c64bc3f4002fe298024b58a
MD5 933d66bb1e3bf3eada10c96ed023e337
SHA1 e3db06e378709343a61435cd9c1ca0def581e6c9
SHA512 8e18b31ae392aa54e4505c68d45c311da4fd84c151b524084a22605428efb88a09083e7fd786e70484efea92c42e124d3d394b1ba37368d0602bf0edaf2dc005
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2W:VLy2Kerc64CiGImVucp4kojWh2W
TLSH
T1B5334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/4924-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000c00000002708f-5.dat	family_juko
behavioral2/memory/4924-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2632-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b4bf-15.dat	family_juko
behavioral2/memory/5188-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5188-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2632	WINWORD.exe
5188	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-1-5-21-650218026-1419908266-2856590055-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-07_933d66bb1e3bf3eada10c96ed023e337_elex_wannacry.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
4744	cmd.exe
5060	PING.EXE
4848	PING.EXE
4980	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5060	PING.EXE
4848	PING.EXE
4980	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4924 wrote to memory of 2632	4924	2026-05-07_933d66bb1e3bf3eada10c96ed023e337_elex_wannacry.exe	79
PID 2632 wrote to memory of 4744	2632	WINWORD.exe	80
PID 4744 wrote to memory of 5060	4744	cmd.exe	82
PID 4744 wrote to memory of 4848	4744	cmd.exe	83
PID 4744 wrote to memory of 4980	4744	cmd.exe	84
PID 4744 wrote to memory of 5188	4744	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-07_933d66bb1e3bf3eada10c96ed023e337_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-07_933d66bb1e3bf3eada10c96ed023e337_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4924
- 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:2632
- - 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\00006640" 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:4744
  - - 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:5060
  - - 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:4848
  - - 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:4980
  - - 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:5188

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

00006640

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006640
Size 49KB
SHA256 1b1922082b4d6f7d6815bc89be543a59edd3638087e1d92066362aa59de7988e
MD5 5ce91527a061a693dd03e315da49bace
SHA1 331ce2dc26fb22a901583b024fbabb5a6df7cedc
SHA512 bc453f47910aab28a6caeeded7633aef742f85a16c991ebf3b66b126e04679bb6645208bbac79fe99356fb498e8ca2994c9ee5397848fe8d3814da4b62be70a1
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h20:VLy2Kerc64CiGImVucp4kojWh20
TLSH
T189334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 23a350cbad592dc7f4035cd269f8628ee8f52ca92c64bc3f4002fe298024b58a
MD5 933d66bb1e3bf3eada10c96ed023e337
SHA1 e3db06e378709343a61435cd9c1ca0def581e6c9
SHA512 8e18b31ae392aa54e4505c68d45c311da4fd84c151b524084a22605428efb88a09083e7fd786e70484efea92c42e124d3d394b1ba37368d0602bf0edaf2dc005
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2W:VLy2Kerc64CiGImVucp4kojWh2W
TLSH
T1B5334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2632-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4924-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4924-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5188-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5188-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads