juko | 42d5f975e7033dec854e40d3ccda808aa20e95e65f19c4c8140cd4705498204c

General

Target
2026-10-02_167027176ad090599fdb52611059a67b_elex_wannacry.exe
Size 100KB
Sample261003-vbza1st1fx
SHA256 42d5f975e7033dec854e40d3ccda808aa20e95e65f19c4c8140cd4705498204c
MD5 167027176ad090599fdb52611059a67b
SHA1 416fd2233f6233471801edf56b2a4b1fdebba908
SHA512 97a0432c546492313f414121043484dd72a61eda5f83fbae99acb74adfd2566f21386237e740f3f6509a841a8d0e0c54ba422ec66f00f7b0a07ff733cf558274
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJV:FLy2Kerc64CiGImavYBoHRBcsAUV
TLSH
T1B4A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
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 2 IoCs

resource	yara_rule
behavioral2/files/0x001200000001b1bc-3.dat	family_juko
behavioral2/files/0x000e00000001c55a-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2808	WINWORD.exe
3480	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-1-5-21-2251218687-1689653882-3767565116-1000\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
2444	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	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	2026-10-02_167027176ad090599fdb52611059a67b_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
2444	cmd.exe
3436	PING.EXE
2056	PING.EXE
4344	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3436	PING.EXE
2056	PING.EXE
4344	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 692 wrote to memory of 2808	692	2026-10-02_167027176ad090599fdb52611059a67b_elex_wannacry.exe	89
PID 2808 wrote to memory of 2444	2808	WINWORD.exe	90
PID 2444 wrote to memory of 3436	2444	cmd.exe	92
PID 2444 wrote to memory of 2056	2444	cmd.exe	93
PID 2444 wrote to memory of 4344	2444	cmd.exe	94
PID 2444 wrote to memory of 3480	2444	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-02_167027176ad090599fdb52611059a67b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-02_167027176ad090599fdb52611059a67b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:692
- 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:2808
- - 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\0000536E" 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:2444
  - - 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:3436
  - - 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:2056
  - - 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:4344
  - - 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:3480

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

0000536E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000536E
Size 100KB
SHA256 5c2d3f6bdb3baf22ee1ae096a850268d9c56abfabcc9f5471289b8a61dce0cc0
MD5 33fe6c2bfd68ac12b365b1de2b19034f
SHA1 78e08e864cc22f70012ed7688d1fa9be55e9b721
SHA512 443c7dc14581507be2a91ae9cf60496e467a7059586019f8430d44d6fdb25d2af594ca7fd9c8444ea69922e915e720fe88e309f4a712454631b05cd1bd6cf35b
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJm:FLy2Kerc64CiGImavYBoHRBcsAUm
TLSH
T104A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 100KB
SHA256 42d5f975e7033dec854e40d3ccda808aa20e95e65f19c4c8140cd4705498204c
MD5 167027176ad090599fdb52611059a67b
SHA1 416fd2233f6233471801edf56b2a4b1fdebba908
SHA512 97a0432c546492313f414121043484dd72a61eda5f83fbae99acb74adfd2566f21386237e740f3f6509a841a8d0e0c54ba422ec66f00f7b0a07ff733cf558274
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJV:FLy2Kerc64CiGImavYBoHRBcsAUV
TLSH
T1B4A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads