juko | 720d2535f440fd2a3f12c202a66bcc392d4e0df62118b616d2e74f494761e3cb

General

Target
2026-08-02_7271d0772b519c18a4227a53b0a1ef54_elex_wannacry.exe
Size 32KB
Sample260802-1h82pasdmb
SHA256 720d2535f440fd2a3f12c202a66bcc392d4e0df62118b616d2e74f494761e3cb
MD5 7271d0772b519c18a4227a53b0a1ef54
SHA1 1c0d051de9a4fc75edd1489d31e3ea3dbba042a9
SHA512 ee2e8c05964ed9a34ec3f89cb8aab296998808a066f1e90b673d4a89b7c48965ea258964f6a0f8c65a147046c3c7cd70ce837f20926552246fd464e52e965134
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHlq:OLsF2Kerc64sTiX2IV0Dpmq
TLSH
T112E2192B2AA17052C59220B0F9591F34C43D5DB50F6BB062F74D7A6928B2D63CF71ACE
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/0x001000000001b1d0-4.dat	family_juko
behavioral2/files/0x001600000001c4a0-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1796	WINWORD.exe
2780	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-1-5-21-1738198120-2966725515-3980530802-1000\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
5480	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-02_7271d0772b519c18a4227a53b0a1ef54_elex_wannacry.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
5480	cmd.exe
3372	PING.EXE
3144	PING.EXE
1052	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3372	PING.EXE
3144	PING.EXE
1052	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4304 wrote to memory of 1796	4304	2026-08-02_7271d0772b519c18a4227a53b0a1ef54_elex_wannacry.exe	89
PID 1796 wrote to memory of 5480	1796	WINWORD.exe	90
PID 5480 wrote to memory of 3372	5480	cmd.exe	92
PID 5480 wrote to memory of 3144	5480	cmd.exe	93
PID 5480 wrote to memory of 1052	5480	cmd.exe	94
PID 5480 wrote to memory of 2780	5480	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_7271d0772b519c18a4227a53b0a1ef54_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_7271d0772b519c18a4227a53b0a1ef54_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4304
- 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:1796
- - 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\0000576C" 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:5480
  - - 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:3372
  - - 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:3144
  - - 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:1052
  - - 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:2780

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

0000576C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000576C
Size 32KB
SHA256 3ca7772618d0bd5d5ac5448a142a7ad68bad7316cdbe5da098305ca8585bb859
MD5 b6ad7d524da8f60f523766009222fc4b
SHA1 16c0959ee8d035e90cab867acf4feadfb5a5801c
SHA512 961410f95d5d31abba45d799a8dd40fc3d8f2b7088686dec1407030277e03d64b5a69044f510d5dfb82513ad162f3c6a4605ace31a5e4db1434f107fb2e34ab8
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHlJ:OLsF2Kerc64sTiX2IV0DpmJ
TLSH
T121E2192B2AA17052C59220B0F9591F34C43D5DB50F6BB062F74D7A6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 720d2535f440fd2a3f12c202a66bcc392d4e0df62118b616d2e74f494761e3cb
MD5 7271d0772b519c18a4227a53b0a1ef54
SHA1 1c0d051de9a4fc75edd1489d31e3ea3dbba042a9
SHA512 ee2e8c05964ed9a34ec3f89cb8aab296998808a066f1e90b673d4a89b7c48965ea258964f6a0f8c65a147046c3c7cd70ce837f20926552246fd464e52e965134
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHlq:OLsF2Kerc64sTiX2IV0Dpmq
TLSH
T112E2192B2AA17052C59220B0F9591F34C43D5DB50F6BB062F74D7A6928B2D63CF71ACE
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