juko | 6c072d2db6b20c6c56f0ece50a5d81dc3fe9b2e9f9437264d3b82c6d5ab2c967

General

Target
2026-10-21_7ee32d156961c0a380581afaf67459d1_elex_wannacry.exe
Size 157KB
Sample261022-ymfvlafs2w
SHA256 6c072d2db6b20c6c56f0ece50a5d81dc3fe9b2e9f9437264d3b82c6d5ab2c967
MD5 7ee32d156961c0a380581afaf67459d1
SHA1 6a714e807d6ff38c39296c6170e8333c4a15a134
SHA512 27262571672e60a69c70d3b1b833048ccd711b8cfe36b22558122ffc234f98e1417aa97fa826ab2b2a3970b12ed852dc886d18f9b576d3c491620b54d17a87ba
SSDEEP 3072:vLy2Kerc64CiGImVuX/N81rRLoPtU+3ZZYRGILCSihxnQDhGgb:vLy2Kwc64YIweIFOjIDLCSiDaQY
TLSH
T10FF31A2BE19723ACE6178278D7EA95B1E0787CA41533BD3D5B14FA302F30C645B7A918
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 6 IoCs

resource	yara_rule
behavioral2/memory/3512-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000700000001b9be-4.dat	family_juko
behavioral2/memory/3512-9-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/1368-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c333-13.dat	family_juko
behavioral2/memory/4692-16-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1368	WINWORD.exe
4692	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-1-5-21-4280978039-528710165-233981602-1000\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
1768	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	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	2026-10-21_7ee32d156961c0a380581afaf67459d1_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
1768	cmd.exe
5788	PING.EXE
924	PING.EXE
792	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
924	PING.EXE
792	PING.EXE
5788	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3512 wrote to memory of 1368	3512	2026-10-21_7ee32d156961c0a380581afaf67459d1_elex_wannacry.exe	89
PID 1368 wrote to memory of 1768	1368	WINWORD.exe	90
PID 1768 wrote to memory of 5788	1768	cmd.exe	92
PID 1768 wrote to memory of 924	1768	cmd.exe	93
PID 1768 wrote to memory of 792	1768	cmd.exe	94
PID 1768 wrote to memory of 4692	1768	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-21_7ee32d156961c0a380581afaf67459d1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-21_7ee32d156961c0a380581afaf67459d1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3512
- 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:1368
- - 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\00000E8E" 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:1768
  - - 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:5788
  - - 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:924
  - - 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:792
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:4692

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00000E8E

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000E8E
Size 157KB
SHA256 9f873bbf06a6eb2a1d8cda69bc72ba35fd53789bf8f5c0531e977b936260bf1c
MD5 1733edc0f1b47c7c8c18c8c32e8767ef
SHA1 ab9a2407bd7ffc0c116583cb3c6aa57758997cfb
SHA512 376d6a95f3ecea4849ce5a24d4d2b2e1324f1cfb58d80e877fbc1cdcccd9b1d8f4dd9b8e2ea67e558e4bd5951f845a7a568db92798e4661ad7b1cc9bacc1a373
SSDEEP 3072:vLy2Kerc64CiGImVuX/N81rRLoPtU+3ZZYRGILCSihxnQDhGgV:vLy2Kwc64YIweIFOjIDLCSiDaQa
TLSH
T106F31A2BE19723ACE6178278D7EA95B1E0787CA41533BD3D5B14FA302F30C645B7A918
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 157KB
SHA256 6c072d2db6b20c6c56f0ece50a5d81dc3fe9b2e9f9437264d3b82c6d5ab2c967
MD5 7ee32d156961c0a380581afaf67459d1
SHA1 6a714e807d6ff38c39296c6170e8333c4a15a134
SHA512 27262571672e60a69c70d3b1b833048ccd711b8cfe36b22558122ffc234f98e1417aa97fa826ab2b2a3970b12ed852dc886d18f9b576d3c491620b54d17a87ba
SSDEEP 3072:vLy2Kerc64CiGImVuX/N81rRLoPtU+3ZZYRGILCSihxnQDhGgb:vLy2Kwc64YIweIFOjIDLCSiDaQY
TLSH
T10FF31A2BE19723ACE6178278D7EA95B1E0787CA41533BD3D5B14FA302F30C645B7A918
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1368-12-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/3512-0-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/3512-9-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/4692-16-0x0000000000400000-0x000000000041C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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