juko | 5deb8e2e216c2abe8e1906d09a223917cd4365676a3b350caca451ab1dae3bc6

General

Target
2026-06-29_b4f853b3f0f18ff8df4bdaf43cb26b48_elex_wannacry.exe
Size 216KB
Sample260630-e8q3xae19k
SHA256 5deb8e2e216c2abe8e1906d09a223917cd4365676a3b350caca451ab1dae3bc6
MD5 b4f853b3f0f18ff8df4bdaf43cb26b48
SHA1 49ef5b610145dee1fb5690ed51857e1c32537552
SHA512 612dc34b87a670e817daabd70b30b3f125165a895fae2360036cf58d35bd8b1b0e48955a747c542d08ead1934942457505f6c6c217aa5a163e78638623537977
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgr:uLy2Kwc64YIcyjIDLCSiDaQw
TLSH
T196240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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/2172-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/files/0x000b00000002437c-5.dat	family_juko
behavioral1/memory/2172-11-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/memory/1664-14-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/files/0x0009000000024549-15.dat	family_juko
behavioral1/memory/4116-17-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/memory/4116-18-0x0000000000400000-0x0000000000436000-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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	2026-06-29_b4f853b3f0f18ff8df4bdaf43cb26b48_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1664	WINWORD.exe
4116	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-1-5-21-1788976790-1541110888-1636651838-1000\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	2026-06-29_b4f853b3f0f18ff8df4bdaf43cb26b48_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
2612	cmd.exe
3352	PING.EXE
3536	PING.EXE
4456	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3536	PING.EXE
4456	PING.EXE
3352	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2172 wrote to memory of 1664	2172	2026-06-29_b4f853b3f0f18ff8df4bdaf43cb26b48_elex_wannacry.exe	84
PID 1664 wrote to memory of 2612	1664	WINWORD.exe	85
PID 2612 wrote to memory of 3352	2612	cmd.exe	87
PID 2612 wrote to memory of 3536	2612	cmd.exe	91
PID 2612 wrote to memory of 4456	2612	cmd.exe	92
PID 2612 wrote to memory of 4116	2612	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-06-29_b4f853b3f0f18ff8df4bdaf43cb26b48_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-29_b4f853b3f0f18ff8df4bdaf43cb26b48_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2172
- 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:1664
- - 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\00007E85" 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:2612
  - - 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:3352
  - - 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:3536
  - - 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:4456
  - - 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:4116

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

00007E85

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007E85
Size 216KB
SHA256 091320d30da881c25356a6aed2381549f38ce5c85fe51d879930f788859f03f6
MD5 88a22e4d111079e9d2a2b5dfa6d8b909
SHA1 48d345169da7922b8c38e5024d6725356afbe0bf
SHA512 9b001e693c1052abcd23a38de7c6b14586bf84dcc2c9c062b7e635b7ce7b33dc28bfff6f2260c51bea0e9cf2169db7314afb4ae125820ba6ec571cb667490eaa
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgg:uLy2Kwc64YIcyjIDLCSiDaQf
TLSH
T18E240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 216KB
SHA256 5deb8e2e216c2abe8e1906d09a223917cd4365676a3b350caca451ab1dae3bc6
MD5 b4f853b3f0f18ff8df4bdaf43cb26b48
SHA1 49ef5b610145dee1fb5690ed51857e1c32537552
SHA512 612dc34b87a670e817daabd70b30b3f125165a895fae2360036cf58d35bd8b1b0e48955a747c542d08ead1934942457505f6c6c217aa5a163e78638623537977
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgr:uLy2Kwc64YIcyjIDLCSiDaQw
TLSH
T196240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1664-14-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/2172-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/2172-11-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4116-17-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4116-18-0x0000000000400000-0x0000000000436000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads