juko | 05f3a40791e2ab5f1f89817f28100d439dbde92c5bed16fca04d98325c141c05

General

Target
2026-06-08_37995ee4b4f3f40549ae74b03b2b76dc_elex_wannacry.exe
Size 32KB
Sample260608-klfxbabs2w
SHA256 05f3a40791e2ab5f1f89817f28100d439dbde92c5bed16fca04d98325c141c05
MD5 37995ee4b4f3f40549ae74b03b2b76dc
SHA1 264f489678b3cf8fa658290a67ed1b3ce99785dc
SHA512 c50f0647a445e215d3213af6d0f046681705e371f7add9c9ee1466758040541e29d01f64f087e5311486612cad528749641d5892a89abb070bc5fa9995aa04de
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpH:OLsF2Kerc64sTiX2IV0DhuH
TLSH
T16BE23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x001300000002a2be-4.dat	family_juko
behavioral2/files/0x000400000002a8f9-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3568	WINWORD.exe
4072	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-1-5-21-226940941-599731907-2645636698-1000\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	2026-06-08_37995ee4b4f3f40549ae74b03b2b76dc_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
5712	cmd.exe
1192	PING.EXE
3736	PING.EXE
5400	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5400	PING.EXE
1192	PING.EXE
3736	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4496 wrote to memory of 3568	4496	2026-06-08_37995ee4b4f3f40549ae74b03b2b76dc_elex_wannacry.exe	80
PID 3568 wrote to memory of 5712	3568	WINWORD.exe	81
PID 5712 wrote to memory of 1192	5712	cmd.exe	83
PID 5712 wrote to memory of 3736	5712	cmd.exe	84
PID 5712 wrote to memory of 5400	5712	cmd.exe	85
PID 5712 wrote to memory of 4072	5712	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-06-08_37995ee4b4f3f40549ae74b03b2b76dc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-08_37995ee4b4f3f40549ae74b03b2b76dc_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4496
- 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:3568
- - 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\0000552E" 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:5712
  - - 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:1192
  - - 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:3736
  - - 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:5400
  - - 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:4072

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

0000552E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000552E
Size 32KB
SHA256 34c42198fe5483a48103630c394a8b46ebf1c6d51aa87e14346de4b7b9613b38
MD5 6cee1a882c7ceb3cb9ebcd6b918fc0c2
SHA1 b658d60cac15212ac0343d24a0e10ba0f901b3b9
SHA512 cda31dc14a9456446b4cbb47769f06b065a736601d5efc8405bdddbf88b5f9fd5a9f69a1d1c7864279b069761d5f42f61159a8687addcd1939c5da5023e765cf
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp7:OLsF2Kerc64sTiX2IV0Dhu7
TLSH
T142E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 05f3a40791e2ab5f1f89817f28100d439dbde92c5bed16fca04d98325c141c05
MD5 37995ee4b4f3f40549ae74b03b2b76dc
SHA1 264f489678b3cf8fa658290a67ed1b3ce99785dc
SHA512 c50f0647a445e215d3213af6d0f046681705e371f7add9c9ee1466758040541e29d01f64f087e5311486612cad528749641d5892a89abb070bc5fa9995aa04de
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpH:OLsF2Kerc64sTiX2IV0DhuH
TLSH
T16BE23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads