juko | 2bc17db3e675f153724edc2dc7a57cdfd453cf1dddb3573cc72e0626e1d8595d

General

Target
2026-07-23_99cbe6dc3cb4d3c8f75768d49129c93c_elex_wannacry.exe
Size 61KB
Sample260723-c8ptqszdnh
SHA256 2bc17db3e675f153724edc2dc7a57cdfd453cf1dddb3573cc72e0626e1d8595d
MD5 99cbe6dc3cb4d3c8f75768d49129c93c
SHA1 aaa8e06f3996e5ff44a086c9642a8e636585b16d
SHA512 b8490f4e672d6862a19dc4714f72b5838c6cc0fdeafa13ee5a84c287d39e08fb1b96dfae2092b5a362f3979e7568d048d33b465b65f58774724aeba8ea249e08
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQz:yLy2Kerc64CiGImVZuyp8T4
TLSH
T11F532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
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/2688-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000a00000001b89b-5.dat	family_juko
behavioral2/memory/2688-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/5348-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000700000001b8b6-13.dat	family_juko
behavioral2/memory/3684-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3684-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5348	WINWORD.exe
3684	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-1-5-21-3797332335-34111092-3597280141-1000\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
4232	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	2026-07-23_99cbe6dc3cb4d3c8f75768d49129c93c_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
4232	cmd.exe
4884	PING.EXE
5824	PING.EXE
3740	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4884	PING.EXE
5824	PING.EXE
3740	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2688 wrote to memory of 5348	2688	2026-07-23_99cbe6dc3cb4d3c8f75768d49129c93c_elex_wannacry.exe	90
PID 5348 wrote to memory of 4232	5348	WINWORD.exe	91
PID 4232 wrote to memory of 4884	4232	cmd.exe	93
PID 4232 wrote to memory of 5824	4232	cmd.exe	94
PID 4232 wrote to memory of 3740	4232	cmd.exe	95
PID 4232 wrote to memory of 3684	4232	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-07-23_99cbe6dc3cb4d3c8f75768d49129c93c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-23_99cbe6dc3cb4d3c8f75768d49129c93c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2688
- 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:5348
- - 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\00003574" 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:4232
  - - 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:4884
  - - 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:5824
  - - 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:3740
  - - 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:3684

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

00003574

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003574
Size 61KB
SHA256 e5aecdad2302aa8832d9a684881d1f134bec619c407ac839842ba616a1243dc5
MD5 4012cc11aaece08bc215e9f39bbd19f8
SHA1 8edbc3ceba8ef547feb7242d91af27698c3a6cd4
SHA512 f4afc6e767167c65f7ec75f28c8e93436739772ff7caddd2dc43e82ab2f66813ea72be9afedc16d6e6b911b8b11f429acae8c6e9e500ef57776fdc8c1a133f44
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQ3:yLy2Kerc64CiGImVZuyp8Tg
TLSH
T18B532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 61KB
SHA256 2bc17db3e675f153724edc2dc7a57cdfd453cf1dddb3573cc72e0626e1d8595d
MD5 99cbe6dc3cb4d3c8f75768d49129c93c
SHA1 aaa8e06f3996e5ff44a086c9642a8e636585b16d
SHA512 b8490f4e672d6862a19dc4714f72b5838c6cc0fdeafa13ee5a84c287d39e08fb1b96dfae2092b5a362f3979e7568d048d33b465b65f58774724aeba8ea249e08
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQz:yLy2Kerc64CiGImVZuyp8T4
TLSH
T11F532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2688-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2688-10-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3684-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3684-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5348-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads