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
behavioral2/memory/4800-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x00170000000115c4-5.dat	family_juko
behavioral2/memory/4800-9-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/4184-12-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x000f00000001b856-13.dat	family_juko
behavioral2/memory/3888-15-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/3888-16-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4184	WINWORD.exe
3888	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-1-5-21-2639994890-966400312-4246138405-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
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

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
1388	PING.EXE
4856	PING.EXE
3080	cmd.exe
3540	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3540	PING.EXE
1388	PING.EXE
4856	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4800 wrote to memory of 4184	4800	2026-06-29_b4f853b3f0f18ff8df4bdaf43cb26b48_elex_wannacry.exe	87
PID 4184 wrote to memory of 3080	4184	WINWORD.exe	88
PID 3080 wrote to memory of 3540	3080	cmd.exe	90
PID 3080 wrote to memory of 1388	3080	cmd.exe	91
PID 3080 wrote to memory of 4856	3080	cmd.exe	92
PID 3080 wrote to memory of 3888	3080	cmd.exe	93

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4800
- 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:4184
- - 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\00000442" 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:3080
  - - 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:3540
  - - 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:1388
  - - 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:4856
  - - 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:3888

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

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

00000442

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000442
Size 216KB
SHA256 3ac918e9bf65676712b83d3bbb341d24143a590b342e7acaeb36e2c6c3e251b5
MD5 b013c807da2a540d5aefcfae5ad9346e
SHA1 cc3e2b295e0897fe4abe8456064f28c4411bc96e
SHA512 d9a8b52beba4e8e0a42a94fe0be5a9880942b2f4d36215efc90d9d91f4627e9697231121b59dd85855a9626556e0066422f6b506d73ddf65b31220445160aed5
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGge:uLy2Kwc64YIcyjIDLCSiDaQB
TLSH
T13E240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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/3888-15-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/3888-16-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4184-12-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4800-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4800-9-0x0000000000400000-0x0000000000436000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads