juko | 90802b268921bfce587c433ec4d6312f2f8a465ebbd6a95c5acccf06fca0bd53

General

Target
2026-08-10_4f434bd5fbe1c7934ba2425dac802a57_elex_wannacry.exe
Size 49KB
Sample260810-ha37csshkb
SHA256 90802b268921bfce587c433ec4d6312f2f8a465ebbd6a95c5acccf06fca0bd53
MD5 4f434bd5fbe1c7934ba2425dac802a57
SHA1 333bb36d9702823c642135d8daf146cdd43fe14a
SHA512 ec0e2db3823776d034c0179a5e93971dfdfd6cf22926296f392703b9772c0a5dcc51b981698c931907cb5b43c6779f3482483e5a82ce454fdc830bf4a18031a9
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2P:4Ly2Kerc64CiGImVu8p4kojWh2P
TLSH
T1AD334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/2272-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001200000001b671-5.dat	family_juko
behavioral2/memory/2272-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4476-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c549-13.dat	family_juko
behavioral2/memory/3100-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3100-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4476	WINWORD.exe
3100	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-1-5-21-3611646547-550105268-947503007-1000\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
1364	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	2026-08-10_4f434bd5fbe1c7934ba2425dac802a57_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
1364	cmd.exe
3348	PING.EXE
1924	PING.EXE
6136	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1924	PING.EXE
6136	PING.EXE
3348	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2272 wrote to memory of 4476	2272	2026-08-10_4f434bd5fbe1c7934ba2425dac802a57_elex_wannacry.exe	89
PID 4476 wrote to memory of 1364	4476	WINWORD.exe	90
PID 1364 wrote to memory of 3348	1364	cmd.exe	92
PID 1364 wrote to memory of 1924	1364	cmd.exe	93
PID 1364 wrote to memory of 6136	1364	cmd.exe	94
PID 1364 wrote to memory of 3100	1364	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-10_4f434bd5fbe1c7934ba2425dac802a57_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_4f434bd5fbe1c7934ba2425dac802a57_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2272
- 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:4476
- - 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\000037F8" 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:1364
  - - 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:3348
  - - 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:1924
  - - 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:6136
  - - 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:3100

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

000037F8

Path C:\Users\Admin\AppData\Roaming\Mozilla\000037F8
Size 49KB
SHA256 22c96008b8f310c824e655427b0536e4970f86f9777a08ffbc89289a32ccd19a
MD5 4cf90aac3186289903b936a88d04cabf
SHA1 3f5f0ad1fc7f52fdcbdf80a15a4a6f7badb2e2ac
SHA512 4f86b067357974499986ae2f8c4a84daf1db6dba70b6057db5671e80e92c684eb94c220b452a68a8f516bd650e07071a7ac407643b54386c1361f96638cf31e4
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2s:4Ly2Kerc64CiGImVu8p4kojWh2s
TLSH
T19A334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 90802b268921bfce587c433ec4d6312f2f8a465ebbd6a95c5acccf06fca0bd53
MD5 4f434bd5fbe1c7934ba2425dac802a57
SHA1 333bb36d9702823c642135d8daf146cdd43fe14a
SHA512 ec0e2db3823776d034c0179a5e93971dfdfd6cf22926296f392703b9772c0a5dcc51b981698c931907cb5b43c6779f3482483e5a82ce454fdc830bf4a18031a9
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2P:4Ly2Kerc64CiGImVu8p4kojWh2P
TLSH
T1AD334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2272-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2272-10-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3100-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3100-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4476-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads