juko | 68c8319dbdf9b06230a3f4baea41271fd4fe02014f61b6bf32b2cf44d4bb63bd

General

Target
2026-11-11_4f44528b8e609c9e5ac07134d43cfef0_elex_wannacry.exe
Size 100KB
Sample261113-ptvsnavy8j
SHA256 68c8319dbdf9b06230a3f4baea41271fd4fe02014f61b6bf32b2cf44d4bb63bd
MD5 4f44528b8e609c9e5ac07134d43cfef0
SHA1 9ace0bd3cd46bb7b079e6215ecdcd1486227bafc
SHA512 682f8ae618240dc1fe320ac71a646972502fa8fbbba182defeec0ad9e5b82f7d2dfc6ca8afffd54c6a192b3a8fe1cf412d5727cc020540e19294c9c2214e0f3f
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJY:FLy2Kerc64CiGImavYBoHRBcsAUY
TLSH
T1D7A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
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/0x00180000000115ae-3.dat	family_juko
behavioral2/files/0x000e00000001c5be-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2832	WINWORD.exe
3952	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-1-5-21-4057491610-3392471755-192832105-1000\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
3632	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-11-11_4f44528b8e609c9e5ac07134d43cfef0_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
3632	cmd.exe
4584	PING.EXE
4720	PING.EXE
4184	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4584	PING.EXE
4720	PING.EXE
4184	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 852 wrote to memory of 2832	852	2026-11-11_4f44528b8e609c9e5ac07134d43cfef0_elex_wannacry.exe	90
PID 2832 wrote to memory of 3632	2832	WINWORD.exe	91
PID 3632 wrote to memory of 4584	3632	cmd.exe	93
PID 3632 wrote to memory of 4720	3632	cmd.exe	94
PID 3632 wrote to memory of 4184	3632	cmd.exe	95
PID 3632 wrote to memory of 3952	3632	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-11-11_4f44528b8e609c9e5ac07134d43cfef0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-11_4f44528b8e609c9e5ac07134d43cfef0_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:852
- 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:2832
- - 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\00007583" 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:3632
  - - 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:4584
  - - 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:4720
  - - 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:4184
  - - 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:3952

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

00007583

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007583
Size 100KB
SHA256 aefb1c875084f774a8535191d636e6de1007b1603076915dbb1f545303112e74
MD5 b1fd6b77a91416b70fc2b5d0f6ae3013
SHA1 c51e5877fbda6d1620b80b4f3a7386fb3f79b5eb
SHA512 f3e4d309e8103aae35fe4242df714d71a431ccc9458e42bab561852299b15e834c72bb2bda7d13f3837984cf5e4347097d8436d0c5986956e1dce99151632047
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJF:FLy2Kerc64CiGImavYBoHRBcsAUF
TLSH
T159A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 100KB
SHA256 68c8319dbdf9b06230a3f4baea41271fd4fe02014f61b6bf32b2cf44d4bb63bd
MD5 4f44528b8e609c9e5ac07134d43cfef0
SHA1 9ace0bd3cd46bb7b079e6215ecdcd1486227bafc
SHA512 682f8ae618240dc1fe320ac71a646972502fa8fbbba182defeec0ad9e5b82f7d2dfc6ca8afffd54c6a192b3a8fe1cf412d5727cc020540e19294c9c2214e0f3f
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJY:FLy2Kerc64CiGImavYBoHRBcsAUY
TLSH
T1D7A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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