juko | 64f8590ae67542c0ecf338dff40fdf315b12d9de74b299fd970d21da45792871

General

Target
2026-05-02_b3a9098a71903cb989ed9ea36abfdc4c_elex_wannacry.exe
Size 95KB
Sample260502-s7dm3sbx21
SHA256 64f8590ae67542c0ecf338dff40fdf315b12d9de74b299fd970d21da45792871
MD5 b3a9098a71903cb989ed9ea36abfdc4c
SHA1 18ee3194c3be07594d08b3337fcd2735029c56ff
SHA512 5142ad39a7729392965166356a7479dc74b46976cf710550c97abb62ac165c89c3d668df29c4d4475c787e5c84c32530650ff98068e309b9b9c1f42403f3096a
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFN+:ELy2Kerc64CiGImqRJshIPFJRAhP2EAa
TLSH
T16793BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
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 7 IoCs

resource	yara_rule
behavioral1/memory/4728-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x00060000000231b9-5.dat	family_juko
behavioral1/memory/4728-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/5800-14-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x0008000000024410-15.dat	family_juko
behavioral1/memory/3772-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/3772-18-0x0000000000400000-0x000000000042B000-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-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	2026-05-02_b3a9098a71903cb989ed9ea36abfdc4c_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5800	WINWORD.exe
3772	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-1-5-21-914486190-3969805341-592249730-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-02_b3a9098a71903cb989ed9ea36abfdc4c_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

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
5284	cmd.exe
2916	PING.EXE
3924	PING.EXE
924	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2916	PING.EXE
3924	PING.EXE
924	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4728 wrote to memory of 5800	4728	2026-05-02_b3a9098a71903cb989ed9ea36abfdc4c_elex_wannacry.exe	86
PID 5800 wrote to memory of 5284	5800	WINWORD.exe	87
PID 5284 wrote to memory of 2916	5284	cmd.exe	89
PID 5284 wrote to memory of 3924	5284	cmd.exe	91
PID 5284 wrote to memory of 924	5284	cmd.exe	92
PID 5284 wrote to memory of 3772	5284	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-05-02_b3a9098a71903cb989ed9ea36abfdc4c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-02_b3a9098a71903cb989ed9ea36abfdc4c_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4728
- 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:5800
- - 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\00004AC7" 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:5284
  - - 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:2916
  - - 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:3924
  - - 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:924
  - - 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:3772

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

00004AC7

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004AC7
Size 95KB
SHA256 c19f73bfa8c25c4781b9a9bf6caf8bf022ff6d1f351782b6541e5eb9bceab04c
MD5 ab43a3e0dab34767bd778f4e1cb81dc0
SHA1 1e9125c14a98a61f12390c152099a9c84cbc7942
SHA512 6c4583a2495ef7cd0f113ef9cd0503a22bf5f651462fd86dbd7db2d261c7c9f796e52ef40034a16a7d1af2cdbe1990f957094c06a08df9139721bbf0a3fcdcc4
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNw:ELy2Kerc64CiGImqRJshIPFJRAhP2EAk
TLSH
T16293BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 64f8590ae67542c0ecf338dff40fdf315b12d9de74b299fd970d21da45792871
MD5 b3a9098a71903cb989ed9ea36abfdc4c
SHA1 18ee3194c3be07594d08b3337fcd2735029c56ff
SHA512 5142ad39a7729392965166356a7479dc74b46976cf710550c97abb62ac165c89c3d668df29c4d4475c787e5c84c32530650ff98068e309b9b9c1f42403f3096a
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFN+:ELy2Kerc64CiGImqRJshIPFJRAhP2EAa
TLSH
T16793BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3772-17-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3772-18-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4728-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4728-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5800-14-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads