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 8 IoCs

resource	yara_rule
behavioral1/memory/4716-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x00100000000231f3-5.dat	family_juko
behavioral1/memory/5668-11-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/4716-13-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/5668-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x00080000000245f8-16.dat	family_juko
behavioral1/memory/5984-18-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/5984-19-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-08-02_b870730049b06a5bce36feaa72940315_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5668	WINWORD.exe
5984	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-1-5-21-3053180483-1881419501-3594244048-1000\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
5232	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	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	2026-08-02_b870730049b06a5bce36feaa72940315_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
5232	cmd.exe
4660	PING.EXE
5832	PING.EXE
4464	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4660	PING.EXE
5832	PING.EXE
4464	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4716 wrote to memory of 5668	4716	2026-08-02_b870730049b06a5bce36feaa72940315_elex_wannacry.exe	84
PID 5668 wrote to memory of 5232	5668	WINWORD.exe	85
PID 5232 wrote to memory of 4660	5232	cmd.exe	87
PID 5232 wrote to memory of 5832	5232	cmd.exe	89
PID 5232 wrote to memory of 4464	5232	cmd.exe	90
PID 5232 wrote to memory of 5984	5232	cmd.exe	91

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4716
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5668
- - 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\000037E1" 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:5232
  - - 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:4660
  - - 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:5832
  - - 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:4464
  - - 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:5984

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

000037E1

Path C:\Users\Admin\AppData\Roaming\Mozilla\000037E1
Size 56KB
SHA256 6c2ce0576b03616f401cad3448e6eb755a66df9922fe8dba61e3f243c72fa929
MD5 d9ff37aff5ffc2b1695baf3faf08e052
SHA1 ecfa0d746da06e2dd490f7377b42977e5e76c352
SHA512 be04138ff9c5f7bc58ea565fa428e1fc6fe0ab9c2e7d8b3d9558aa2bffc9a5d9c65ec18c812dd0a8700692f7a05ef959ee09de1ec66a3b27d0e3ec05f0825375
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWY:PLy2Kerc64CiGImqRa8OKFE9WBY
TLSH
T1434319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
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/4716-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4716-13-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5668-11-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/5668-15-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/5984-18-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5984-19-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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