juko | 42e68830e95419ec16b1ebb737b40b5cb758a6bd81b80872a2db998377539cf9

General

Target
2026-10-26_59c2ba1f1fe7698dc6122cf7a844590d_elex_wannacry.exe
Size 39KB
Sample261027-t8mstaew5v
SHA256 42e68830e95419ec16b1ebb737b40b5cb758a6bd81b80872a2db998377539cf9
MD5 59c2ba1f1fe7698dc6122cf7a844590d
SHA1 d2e79c9bb2595865bf5a08139da7d458e4e84b3a
SHA512 ba8c51c66d7899ae838c81f2bbfbfc1106a3aa8765a1a7d31c363be6105e0bb57d54075d0121486e343b3997b80d6195f45fbb75b7ca71df9c88261a00fc07b2
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpNa0dX60a5ywa6:OLsF2Kerc64sTiX2IV0DhuPoTgwX
TLSH
T171037C1B695560A3C59711B0E5E81FB5843D8CB2046BB062FB40BA5998B3CD3DF72BCE
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/0x001c00000000696b-3.dat	family_juko
behavioral2/files/0x000a000000016bc8-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3332	WINWORD.exe
4424	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-1-5-21-1404337215-1550464601-2805570857-1000\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
4636	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	2026-10-26_59c2ba1f1fe7698dc6122cf7a844590d_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
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
4636	cmd.exe
2000	PING.EXE
4608	PING.EXE
3944	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2000	PING.EXE
4608	PING.EXE
3944	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2692 wrote to memory of 3332	2692	2026-10-26_59c2ba1f1fe7698dc6122cf7a844590d_elex_wannacry.exe	89
PID 3332 wrote to memory of 4636	3332	WINWORD.exe	90
PID 4636 wrote to memory of 2000	4636	cmd.exe	92
PID 4636 wrote to memory of 4608	4636	cmd.exe	93
PID 4636 wrote to memory of 3944	4636	cmd.exe	94
PID 4636 wrote to memory of 4424	4636	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-26_59c2ba1f1fe7698dc6122cf7a844590d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_59c2ba1f1fe7698dc6122cf7a844590d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2692
- 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:3332
- - 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\000072F7" 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:4636
  - - 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:2000
  - - 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:4608
  - - 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:3944
  - - 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:4424

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

000072F7

Path C:\Users\Admin\AppData\Roaming\Mozilla\000072F7
Size 39KB
SHA256 85a9e0a6dede64ee164f13e7df385e52ba46c7852e611b1617c5a0e74d06e65c
MD5 e99afd58895e268ee21189fb7754eca0
SHA1 8e441ac1d137c8b1cc7e867dc5435bb1d7b12010
SHA512 4477f17ffbc4d46c4f228b011f5e6e72d84b25ae109ac23df1a9dd614a9dfce31acee2b9a4752a52a971b97d5ad227700aad2882c9d849cb443b96faa5b94dc6
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpNa0dX60a5ywa3:OLsF2Kerc64sTiX2IV0DhuPoTgw+
TLSH
T1BB037C1B695560A3C59711B0E5E81FB5843D8CB2046BB062FB40BA5998B3CD3DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 42e68830e95419ec16b1ebb737b40b5cb758a6bd81b80872a2db998377539cf9
MD5 59c2ba1f1fe7698dc6122cf7a844590d
SHA1 d2e79c9bb2595865bf5a08139da7d458e4e84b3a
SHA512 ba8c51c66d7899ae838c81f2bbfbfc1106a3aa8765a1a7d31c363be6105e0bb57d54075d0121486e343b3997b80d6195f45fbb75b7ca71df9c88261a00fc07b2
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpNa0dX60a5ywa6:OLsF2Kerc64sTiX2IV0DhuPoTgwX
TLSH
T171037C1B695560A3C59711B0E5E81FB5843D8CB2046BB062FB40BA5998B3CD3DF72BCE
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