juko | 015e91579c397519dbb5d8ac487817906664f45a40869ffa59bedd46280629c9

General

Target
2026-08-02_b870730049b06a5bce36feaa72940315_elex_wannacry.exe
Size 56KB
Sample260802-vmjppsxcpd
SHA256 015e91579c397519dbb5d8ac487817906664f45a40869ffa59bedd46280629c9
MD5 b870730049b06a5bce36feaa72940315
SHA1 29639e77c237699bbd6b2cfdcf74f1c7e3bb60ce
SHA512 0964c4bd590941455bd91151de6ca1ffd18c4287ef9fcbf2126ac7c3e4d9c7dbecd20372717c9abd7350bd96cfbf3786179117c7fb7c99e49386e8cac9e24746
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGW0:PLy2Kerc64CiGImqRa8OKFE9WB0
TLSH
T1F04319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
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/5644-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001000000001b1d0-5.dat	family_juko
behavioral2/memory/5644-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4072-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001600000001c4a0-13.dat	family_juko
behavioral2/memory/4592-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4592-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4072	WINWORD.exe
4592	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-1-5-21-1738198120-2966725515-3980530802-1000\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
5480	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	2026-08-02_b870730049b06a5bce36feaa72940315_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
5480	cmd.exe
2004	PING.EXE
6020	PING.EXE
2372	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6020	PING.EXE
2372	PING.EXE
2004	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5644 wrote to memory of 4072	5644	2026-08-02_b870730049b06a5bce36feaa72940315_elex_wannacry.exe	89
PID 4072 wrote to memory of 5480	4072	WINWORD.exe	90
PID 5480 wrote to memory of 2004	5480	cmd.exe	92
PID 5480 wrote to memory of 6020	5480	cmd.exe	93
PID 5480 wrote to memory of 2372	5480	cmd.exe	94
PID 5480 wrote to memory of 4592	5480	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_b870730049b06a5bce36feaa72940315_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_b870730049b06a5bce36feaa72940315_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5644
- 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:4072
- - 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\0000612E" 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:5480
  - - 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:2004
  - - 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:6020
  - - 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:2372
  - - 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:4592

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

0000612E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000612E
Size 56KB
SHA256 b84e4f788b4da9e4bf1f032284f976aacd42941dbf45e31dd52ca0bd778fd1f5
MD5 747866de95e77208b711381f5d433d05
SHA1 5a3178d21bf1a4634689605d556bc3de1b6ee161
SHA512 cd9afdd4b5708d4b0b4d1e000bfa2fce4cc6e03e118730ec1b0771a6a66ff515f5376a62fcb0a20449ccd2a1284bdf6946cb6d41392723b661c8e3dc843ab89b
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWA:PLy2Kerc64CiGImqRa8OKFE9WBA
TLSH
T1374319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 015e91579c397519dbb5d8ac487817906664f45a40869ffa59bedd46280629c9
MD5 b870730049b06a5bce36feaa72940315
SHA1 29639e77c237699bbd6b2cfdcf74f1c7e3bb60ce
SHA512 0964c4bd590941455bd91151de6ca1ffd18c4287ef9fcbf2126ac7c3e4d9c7dbecd20372717c9abd7350bd96cfbf3786179117c7fb7c99e49386e8cac9e24746
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGW0:PLy2Kerc64CiGImqRa8OKFE9WB0
TLSH
T1F04319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4072-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4592-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4592-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5644-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5644-10-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads