juko | 61d32190e342e7becdf5a8dad9a7cda74c42af6c3b0eebd2be68204ef8642b1b

General

Target
2026-08-03_5b31ee08922534a5634413b32ef6d964_elex_wannacry.exe
Size 153KB
Sample260804-ny66tavydt
SHA256 61d32190e342e7becdf5a8dad9a7cda74c42af6c3b0eebd2be68204ef8642b1b
MD5 5b31ee08922534a5634413b32ef6d964
SHA1 7bf739ae4f1988a26bec8919e895cf2078c1d546
SHA512 27e9ea213822ade67dcc58a784403bb3fc3cb56a9345873c02444d777c188cc7049db8167dfc9628a7ac415ac25a35db9e08870b0a1c46cb4d7eed4eda480a23
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2g+:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZ0
TLSH
T1F4E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
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/3000-0-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/files/0x001b00000001c343-5.dat	family_juko
behavioral2/memory/3000-10-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/memory/5884-12-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/files/0x001100000001c505-13.dat	family_juko
behavioral2/memory/3416-15-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/memory/3416-16-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5884	WINWORD.exe
3416	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-1-5-21-1875162379-3804078649-638427191-1000\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
3016	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	2026-08-03_5b31ee08922534a5634413b32ef6d964_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
3016	cmd.exe
2976	PING.EXE
5492	PING.EXE
3260	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2976	PING.EXE
5492	PING.EXE
3260	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3000 wrote to memory of 5884	3000	2026-08-03_5b31ee08922534a5634413b32ef6d964_elex_wannacry.exe	89
PID 5884 wrote to memory of 3016	5884	WINWORD.exe	90
PID 3016 wrote to memory of 2976	3016	cmd.exe	92
PID 3016 wrote to memory of 5492	3016	cmd.exe	93
PID 3016 wrote to memory of 3260	3016	cmd.exe	94
PID 3016 wrote to memory of 3416	3016	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-03_5b31ee08922534a5634413b32ef6d964_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_5b31ee08922534a5634413b32ef6d964_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3000
- 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:5884
- - 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\000024C0" 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:3016
  - - 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:2976
  - - 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:5492
  - - 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:3260
  - - 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:3416

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

000024C0

Path C:\Users\Admin\AppData\Roaming\Mozilla\000024C0
Size 153KB
SHA256 19ab59153d8c50ec7463cd65cbc9151993e2ba241882c44bcba5b9f5195bf888
MD5 c825fcd1e62933fe4c8ff6c02a00144c
SHA1 aa759ce4f2e8a5bf085645a2e564c3185937cccc
SHA512 87d2c079454400d3e5253ebdf67c231d238863fcd412817c7724393fb8276909b0eb871e57fa24f15f04df9638a557414f0be168969a949bb353856e2cb4ce2c
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gV:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZP
TLSH
T1A5E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 153KB
SHA256 61d32190e342e7becdf5a8dad9a7cda74c42af6c3b0eebd2be68204ef8642b1b
MD5 5b31ee08922534a5634413b32ef6d964
SHA1 7bf739ae4f1988a26bec8919e895cf2078c1d546
SHA512 27e9ea213822ade67dcc58a784403bb3fc3cb56a9345873c02444d777c188cc7049db8167dfc9628a7ac415ac25a35db9e08870b0a1c46cb4d7eed4eda480a23
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2g+:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZ0
TLSH
T1F4E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3000-0-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/3000-10-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/3416-15-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/3416-16-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/5884-12-0x0000000000400000-0x000000000043B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads