juko | 8046dd82484d5000342f7bc5fef614fc08004e3432ecb9cbb8554ab74763c1ad

General

Target
2026-07-27_0331bf6d021a9869781645cacb7c5f6f_elex_wannacry.exe
Size 61KB
Sample260727-a8jxdatxb1
SHA256 8046dd82484d5000342f7bc5fef614fc08004e3432ecb9cbb8554ab74763c1ad
MD5 0331bf6d021a9869781645cacb7c5f6f
SHA1 71bfdad062d543b08586698c2a24a0a97cf9acbc
SHA512 efb42586c56c1f343b20fca8005c54f7230961f6f342490f4f28cd926a0baeae690ac2d7817291e53aa01b1165aa72acc420d3e322bb8bedd82cb76f20cec824
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQl:yLy2Kerc64CiGImVZuyp8T2
TLSH
T1FF532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
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/4368-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b87d-5.dat	family_juko
behavioral2/memory/4368-9-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/1856-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c53a-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
1856	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
4804	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	2026-07-27_0331bf6d021a9869781645cacb7c5f6f_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
4804	cmd.exe
2436	PING.EXE
3084	PING.EXE
5188	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2436	PING.EXE
3084	PING.EXE
5188	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4368 wrote to memory of 1856	4368	2026-07-27_0331bf6d021a9869781645cacb7c5f6f_elex_wannacry.exe	89
PID 1856 wrote to memory of 4804	1856	WINWORD.exe	90
PID 4804 wrote to memory of 2436	4804	cmd.exe	92
PID 4804 wrote to memory of 3084	4804	cmd.exe	93
PID 4804 wrote to memory of 5188	4804	cmd.exe	94
PID 4804 wrote to memory of 3684	4804	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-27_0331bf6d021a9869781645cacb7c5f6f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-27_0331bf6d021a9869781645cacb7c5f6f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4368
- 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:1856
- - 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\00003985" 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:4804
  - - 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:2436
  - - 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:3084
  - - 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:5188
  - - 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

00003985

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003985
Size 61KB
SHA256 15fb0cee204478635b67e8e248acc6c64c20f6aca393680293a16f7587bd83a5
MD5 a4f358574638db1149fc21373e098ac4
SHA1 6d90f0db88894c5e0de2672fa43fa52db5c07230
SHA512 b8e9166b61e1a845931279b98e7946001026589ed8257defc26ba81706220aeac525078296a56036fbe613e7a3c2601fbaaeb56370291d35f5cf092a46486d54
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQX:yLy2Kerc64CiGImVZuyp8TU
TLSH
T1AA532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 61KB
SHA256 8046dd82484d5000342f7bc5fef614fc08004e3432ecb9cbb8554ab74763c1ad
MD5 0331bf6d021a9869781645cacb7c5f6f
SHA1 71bfdad062d543b08586698c2a24a0a97cf9acbc
SHA512 efb42586c56c1f343b20fca8005c54f7230961f6f342490f4f28cd926a0baeae690ac2d7817291e53aa01b1165aa72acc420d3e322bb8bedd82cb76f20cec824
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQl:yLy2Kerc64CiGImVZuyp8T2
TLSH
T1FF532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1856-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

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

Download

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

Download

memory/4368-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4368-9-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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