juko | fb693b53fdcc54b48a8d80ec9e1a14ba6c0cd5de6841e3e63a5760db97fbf29a

General

Target
2026-08-08_3b5f3ff208a4c6c9ab7a182662b5dfb1_elex_wannacry.exe
Size 50KB
Sample260808-kwvhfsxtfs
SHA256 fb693b53fdcc54b48a8d80ec9e1a14ba6c0cd5de6841e3e63a5760db97fbf29a
MD5 3b5f3ff208a4c6c9ab7a182662b5dfb1
SHA1 b745d01b155f4c70b85196bbf9823f88a052673e
SHA512 27cc3e182aba8dc9b8781a54c89712e4b23c2d67b56b534be532c3052dd9e452f1364042c96058bac20c4d6a97fdc7dee667fb9518cccfdabda3e8e74cff06a9
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOZ:tLsF2Kerc64sTiX2IV0DpL8SE9nYOZ
TLSH
T11C33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
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/0x000f000000019ca9-4.dat	family_juko
behavioral2/files/0x000f00000001c600-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3376	WINWORD.exe
4996	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-1-5-21-2301830172-776172150-2531349243-1000\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
1444	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	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	2026-08-08_3b5f3ff208a4c6c9ab7a182662b5dfb1_elex_wannacry.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
3028	PING.EXE
1868	PING.EXE
2876	PING.EXE
1444	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3028	PING.EXE
1868	PING.EXE
2876	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3340 wrote to memory of 3376	3340	2026-08-08_3b5f3ff208a4c6c9ab7a182662b5dfb1_elex_wannacry.exe	89
PID 3376 wrote to memory of 1444	3376	WINWORD.exe	90
PID 1444 wrote to memory of 3028	1444	cmd.exe	92
PID 1444 wrote to memory of 1868	1444	cmd.exe	93
PID 1444 wrote to memory of 2876	1444	cmd.exe	94
PID 1444 wrote to memory of 4996	1444	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_3b5f3ff208a4c6c9ab7a182662b5dfb1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_3b5f3ff208a4c6c9ab7a182662b5dfb1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3340
- 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:3376
- - 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\00003423" 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:1444
  - - 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:3028
  - - 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:1868
  - - 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:2876
  - - 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:4996

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

00003423

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003423
Size 50KB
SHA256 9450f05a5078223c6397851a32f68e53fdb955cc0789ae90cdfa70f867e9a63f
MD5 05d15f1904c15d30a772a9c6af380f7b
SHA1 7c75848d8e3eb149394d384b478690621d07647a
SHA512 ddfd9cdf50381c0a2dade96194e90c84adb9f52658d39b587db1b9a97e25b862422b45abde699ad59ff4630f4290863dd79f75016f84c41557f4d2ce676cc1b8
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOD:tLsF2Kerc64sTiX2IV0DpL8SE9nYOD
TLSH
T1F133291A3B41E1D1C4A351B0EC5B4F74983AEDB58E676103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 fb693b53fdcc54b48a8d80ec9e1a14ba6c0cd5de6841e3e63a5760db97fbf29a
MD5 3b5f3ff208a4c6c9ab7a182662b5dfb1
SHA1 b745d01b155f4c70b85196bbf9823f88a052673e
SHA512 27cc3e182aba8dc9b8781a54c89712e4b23c2d67b56b534be532c3052dd9e452f1364042c96058bac20c4d6a97fdc7dee667fb9518cccfdabda3e8e74cff06a9
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOZ:tLsF2Kerc64sTiX2IV0DpL8SE9nYOZ
TLSH
T11C33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
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