juko | 9b48cea64ad6f534155b88e01c788be45f9a6a5e3884b0240e030d12cff67188

General

Target
2026-08-09_4962b4b7e7e9b0db70993b99a40d07fb_elex_wannacry.exe
Size 68KB
Sample260809-31gq9sfp21
SHA256 9b48cea64ad6f534155b88e01c788be45f9a6a5e3884b0240e030d12cff67188
MD5 4962b4b7e7e9b0db70993b99a40d07fb
SHA1 e1cb4e0a8963a24679f39fdf834cbbdb1b770482
SHA512 54436dd749d2eb25ebcca7fb4fe1d7e1a22f5c93deae29bfef05e086d4dfab4eebc553698c6985088f05f035c99a5d2a370bdcd5fed68decd3489f8021a80f7b
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpF:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpF
TLSH
T12763A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
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 7 IoCs

resource	yara_rule
behavioral2/memory/3380-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000d000000016cd6-5.dat	family_juko
behavioral2/memory/3380-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4716-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c541-13.dat	family_juko
behavioral2/memory/1480-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1480-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4716	WINWORD.exe
1480	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-1-5-21-3989226554-2204910950-1522900112-1000\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
1660	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	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	2026-08-09_4962b4b7e7e9b0db70993b99a40d07fb_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
3080	PING.EXE
3180	PING.EXE
2124	PING.EXE
1660	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3080	PING.EXE
3180	PING.EXE
2124	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3380 wrote to memory of 4716	3380	2026-08-09_4962b4b7e7e9b0db70993b99a40d07fb_elex_wannacry.exe	89
PID 4716 wrote to memory of 1660	4716	WINWORD.exe	90
PID 1660 wrote to memory of 3080	1660	cmd.exe	92
PID 1660 wrote to memory of 3180	1660	cmd.exe	93
PID 1660 wrote to memory of 2124	1660	cmd.exe	94
PID 1660 wrote to memory of 1480	1660	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_4962b4b7e7e9b0db70993b99a40d07fb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_4962b4b7e7e9b0db70993b99a40d07fb_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3380
- 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:4716
- - 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\00000EA1" 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:1660
  - - 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:3080
  - - 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:3180
  - - 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:2124
  - - 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:1480

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00000EA1

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000EA1
Size 68KB
SHA256 6ee5b2050001f39499c1eb85b4171b1904b97500384b7e7a6a099011f30a449e
MD5 7f19894452827c919f4fe869232510a9
SHA1 c2a89a1d8aa99766190001483e12f70d611fdcaf
SHA512 e5835b4169e4c7fa61e75fb491dcec98121754c0e8e578a6f7e3a5298edfe07a14507623b70e74e907dec469541ebc1901346bd258cce0e3695f41a627ad47c2
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpb:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpb
TLSH
T13163A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 9b48cea64ad6f534155b88e01c788be45f9a6a5e3884b0240e030d12cff67188
MD5 4962b4b7e7e9b0db70993b99a40d07fb
SHA1 e1cb4e0a8963a24679f39fdf834cbbdb1b770482
SHA512 54436dd749d2eb25ebcca7fb4fe1d7e1a22f5c93deae29bfef05e086d4dfab4eebc553698c6985088f05f035c99a5d2a370bdcd5fed68decd3489f8021a80f7b
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpF:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpF
TLSH
T12763A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1480-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1480-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3380-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3380-9-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/4716-12-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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