juko | cca3cf5a0c976b485398ae688b2e44a6f697b941b34b4dd341dadc6c1c7489c3

General

Target
2026-08-05_cbbe50d6aa690a2ae3b900798981e975_elex_wannacry.exe
Size 56KB
Sample260805-3vxwasef32
SHA256 cca3cf5a0c976b485398ae688b2e44a6f697b941b34b4dd341dadc6c1c7489c3
MD5 cbbe50d6aa690a2ae3b900798981e975
SHA1 096e210bfdcdbc98a7bcd63d8e51b43fbfed3972
SHA512 859d01f3bd9f203d2663c8d9d9176be50ca9406001fe4d08d6a8f44cfde1bfd4c0a188ad9a7b3cf65ef852c93c70746038744b351ebb4e2ea05b9013672f330c
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWt:PLy2Kerc64CiGImqRa8OKFE9WBt
TLSH
T1A14319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/4684-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000900000001b884-5.dat	family_juko
behavioral2/memory/4684-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/5836-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c4e1-13.dat	family_juko
behavioral2/memory/4372-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4372-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5836	WINWORD.exe
4372	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-1-5-21-552508041-2681165170-3229858294-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
3740	cmd.exe

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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-05_cbbe50d6aa690a2ae3b900798981e975_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

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
3740	cmd.exe
1688	PING.EXE
4460	PING.EXE
252	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1688	PING.EXE
4460	PING.EXE
252	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4684 wrote to memory of 5836	4684	2026-08-05_cbbe50d6aa690a2ae3b900798981e975_elex_wannacry.exe	89
PID 5836 wrote to memory of 3740	5836	WINWORD.exe	90
PID 3740 wrote to memory of 1688	3740	cmd.exe	92
PID 3740 wrote to memory of 4460	3740	cmd.exe	93
PID 3740 wrote to memory of 252	3740	cmd.exe	94
PID 3740 wrote to memory of 4372	3740	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-05_cbbe50d6aa690a2ae3b900798981e975_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-05_cbbe50d6aa690a2ae3b900798981e975_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4684
- 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:5836
- - 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\00000638" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3740
  - - 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:1688
  - - 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:4460
  - - 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:252
  - - 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:4372

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

00000638

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000638
Size 56KB
SHA256 f7673bd659e0c239120023fa9a684deb60ea5cc830e105b6e2a446fdc564a7e6
MD5 0af3f9338a8028712d38d8ed56cc9b92
SHA1 4910a62a76a47b008246745acbe5e7a463c0b956
SHA512 7843b3819b58b37decf52415ea09e9e69204b3467d7b5215d82aef308b6e9cdcf818252c8cd8dedc800bd5bed709335410063c85e5e5fd093fe669339ad9556e
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWg:PLy2Kerc64CiGImqRa8OKFE9WBg
TLSH
T1144319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 cca3cf5a0c976b485398ae688b2e44a6f697b941b34b4dd341dadc6c1c7489c3
MD5 cbbe50d6aa690a2ae3b900798981e975
SHA1 096e210bfdcdbc98a7bcd63d8e51b43fbfed3972
SHA512 859d01f3bd9f203d2663c8d9d9176be50ca9406001fe4d08d6a8f44cfde1bfd4c0a188ad9a7b3cf65ef852c93c70746038744b351ebb4e2ea05b9013672f330c
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWt:PLy2Kerc64CiGImqRa8OKFE9WBt
TLSH
T1A14319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4372-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4372-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4684-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4684-10-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5836-12-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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