juko | af3f789002694fc607910bc8c91d55057b873bd335f35c45e5aadefee2cdc26e

General

Target
2026-04-26_0dc5d591036dd3eeb3f9529bb6de6e28_elex_wannacry.exe
Size 87KB
Sample260426-tx2gtsfs2m
SHA256 af3f789002694fc607910bc8c91d55057b873bd335f35c45e5aadefee2cdc26e
MD5 0dc5d591036dd3eeb3f9529bb6de6e28
SHA1 ab1b1fbf7b591e81011c923c29d33a26f1d75093
SHA512 cb98bbc691c6544386efc92ea192a259b66b46e492d5a7abb4e98cc1fe86aa2622b0bbe780abb691db9b32248f5d77ad06ef47ea680ad6b636d90f0db2d9f2d0
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpm:2Ly2Kerc64CiGIm1K851YO6EQkwpm
TLSH
T15493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 8 IoCs

resource	yara_rule
behavioral1/memory/4040-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000d000000024299-4.dat	family_juko
behavioral1/memory/4040-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/3780-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/3780-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x0008000000024493-16.dat	family_juko
behavioral1/memory/2240-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/2240-19-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	2026-04-26_0dc5d591036dd3eeb3f9529bb6de6e28_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
3780	WINWORD.exe
2240	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-1-5-21-312252282-3884318443-358092420-1000\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

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	2026-04-26_0dc5d591036dd3eeb3f9529bb6de6e28_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
4564	PING.EXE
1596	cmd.exe
1668	PING.EXE
1320	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1320	PING.EXE
4564	PING.EXE
1668	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4040 wrote to memory of 3780	4040	2026-04-26_0dc5d591036dd3eeb3f9529bb6de6e28_elex_wannacry.exe	83
PID 3780 wrote to memory of 1596	3780	WINWORD.exe	85
PID 1596 wrote to memory of 1668	1596	cmd.exe	87
PID 1596 wrote to memory of 1320	1596	cmd.exe	88
PID 1596 wrote to memory of 4564	1596	cmd.exe	89
PID 1596 wrote to memory of 2240	1596	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-04-26_0dc5d591036dd3eeb3f9529bb6de6e28_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-26_0dc5d591036dd3eeb3f9529bb6de6e28_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4040
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3780
- - 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\00005A0D" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:1596
  - - 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:1668
  - - 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:1320
  - - 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:4564
  - - 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:2240

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00005A0D

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005A0D
Size 87KB
SHA256 0844dfa73f22e96c9125fbcc987a09b3ca0688e10a0c361cfd45ed00a7e8b8d0
MD5 c1b60c78f207ccb60cd18f24f6812721
SHA1 cbf6a9f4c8417991fcd5a8053fc0ed57809ee2fd
SHA512 2b833aecdae145438fc228a2e55829ea5289f2bae2f46363da02f4b5b8e42fb58f9f837f19e017be7f8e21570ef4111de557601e037d4531e6fed7aab16ea177
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpx:2Ly2Kerc64CiGIm1K851YO6EQkwpx
TLSH
T1A093A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 af3f789002694fc607910bc8c91d55057b873bd335f35c45e5aadefee2cdc26e
MD5 0dc5d591036dd3eeb3f9529bb6de6e28
SHA1 ab1b1fbf7b591e81011c923c29d33a26f1d75093
SHA512 cb98bbc691c6544386efc92ea192a259b66b46e492d5a7abb4e98cc1fe86aa2622b0bbe780abb691db9b32248f5d77ad06ef47ea680ad6b636d90f0db2d9f2d0
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpm:2Ly2Kerc64CiGIm1K851YO6EQkwpm
TLSH
T15493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2240-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2240-19-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3780-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3780-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4040-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4040-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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