juko | e0cb8acb3a16317be1b177190d268e5d0f59d667460f26809ca4293a7a841631

General

Target
2026-08-30_40513f4488443818bdfc39eccb8e1399_elex_wannacry.exe
Size 69KB
Sample260901-cxevdssape
SHA256 e0cb8acb3a16317be1b177190d268e5d0f59d667460f26809ca4293a7a841631
MD5 40513f4488443818bdfc39eccb8e1399
SHA1 e5307a451075720499861da34f0478f888d6b9e9
SHA512 7b0582370cd1982c2ab998046151024addc1184ad1c704e0a347ca644c371fa099a8ac25f8410f9d93ab1b31b19e3990fc0bf741189e429ec089becb55d1c9af
SSDEEP 1536:tLsF2Kerc64sTiX2IV0DpK8SE9nYOhoQ6YBwEM9U:tLy2Kerc64CiGIm1K851YOhqYBwEM9U
TLSH
T17363F70737A4A1E1D0A35270E8660B649B37ECB19A73A2077B94771D1DB2A41CF31B9B
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/0x000c00000001136a-4.dat	family_juko
behavioral2/files/0x0005000000016cd6-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4772	WINWORD.exe
848	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-1-5-21-552508041-2681165170-3229858294-1000\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
4328	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	2026-08-30_40513f4488443818bdfc39eccb8e1399_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
1380	PING.EXE
5672	PING.EXE
4328	cmd.exe
5084	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5084	PING.EXE
1380	PING.EXE
5672	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3164 wrote to memory of 4772	3164	2026-08-30_40513f4488443818bdfc39eccb8e1399_elex_wannacry.exe	89
PID 4772 wrote to memory of 4328	4772	WINWORD.exe	90
PID 4328 wrote to memory of 5084	4328	cmd.exe	92
PID 4328 wrote to memory of 1380	4328	cmd.exe	93
PID 4328 wrote to memory of 5672	4328	cmd.exe	94
PID 4328 wrote to memory of 848	4328	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-30_40513f4488443818bdfc39eccb8e1399_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-30_40513f4488443818bdfc39eccb8e1399_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3164
- 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:4772
- - 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\000025AB" 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:4328
  - - 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:5084
  - - 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:1380
  - - 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:5672
  - - 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:848

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

000025AB

Path C:\Users\Admin\AppData\Roaming\Mozilla\000025AB
Size 69KB
SHA256 e6c6abb461b9ac50d6447227fef5c3dd351261175c1280dd7619ccbdbc512438
MD5 f9359d430f36f0ca25d244b43ef68206
SHA1 b4877b25e06582c20ed3557fa2b77b3f3894bf9a
SHA512 293c631da3464ad7255b631e4d69cf9832eb3ee4a5202b0f3b364d2419f971e86a32878353da623f23b23d41f5d103a4aef3bcabff8905042e95196c9392431e
SSDEEP 1536:tLsF2Kerc64sTiX2IV0DpK8SE9nYOhoQ6YBwEM99:tLy2Kerc64CiGIm1K851YOhqYBwEM99
TLSH
T13563F70737A4A1E1D0A35270E8660B649B37ECB19A73A2077B94771D1DB2A41CF31B9B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 69KB
SHA256 e0cb8acb3a16317be1b177190d268e5d0f59d667460f26809ca4293a7a841631
MD5 40513f4488443818bdfc39eccb8e1399
SHA1 e5307a451075720499861da34f0478f888d6b9e9
SHA512 7b0582370cd1982c2ab998046151024addc1184ad1c704e0a347ca644c371fa099a8ac25f8410f9d93ab1b31b19e3990fc0bf741189e429ec089becb55d1c9af
SSDEEP 1536:tLsF2Kerc64sTiX2IV0DpK8SE9nYOhoQ6YBwEM9U:tLy2Kerc64CiGIm1K851YOhqYBwEM9U
TLSH
T17363F70737A4A1E1D0A35270E8660B649B37ECB19A73A2077B94771D1DB2A41CF31B9B
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