juko | 55af302f342126f4d81502943013803513c6be4a233768b0df2dde9043908db8

General

Target
2026-05-27_6437d5cf526755f9169489e5cf2b5525_elex_wannacry.exe
Size 32KB
Sample260527-e55f5ahw2z
SHA256 55af302f342126f4d81502943013803513c6be4a233768b0df2dde9043908db8
MD5 6437d5cf526755f9169489e5cf2b5525
SHA1 656df861d8595c434c7ce2e54cec9ee2c59aba97
SHA512 6883bc34534acd405c0ca7cd191795dc653baec4e61ad3dd0e873e19884b8a64133b02a8068c547bcadbc349c0b593e47c869af9e9be9d50699ec71928b3184d
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpn:OLsF2Kerc64sTiX2IV0Dhun
TLSH
T1C6E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
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/0x000d00000002a053-4.dat	family_juko
behavioral2/files/0x001b00000002b584-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4164	WINWORD.exe
484	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-1-5-21-1768642833-2142038154-4041560723-1000\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	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	2026-05-27_6437d5cf526755f9169489e5cf2b5525_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

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
4412	PING.EXE
856	cmd.exe
4332	PING.EXE
2488	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4412	PING.EXE
4332	PING.EXE
2488	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 828 wrote to memory of 4164	828	2026-05-27_6437d5cf526755f9169489e5cf2b5525_elex_wannacry.exe	81
PID 4164 wrote to memory of 856	4164	WINWORD.exe	82
PID 856 wrote to memory of 4332	856	cmd.exe	84
PID 856 wrote to memory of 2488	856	cmd.exe	85
PID 856 wrote to memory of 4412	856	cmd.exe	86
PID 856 wrote to memory of 484	856	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-05-27_6437d5cf526755f9169489e5cf2b5525_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-27_6437d5cf526755f9169489e5cf2b5525_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:828
- 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:4164
- - 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\00003B09" 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:856
  - - 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:4332
  - - 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:2488
  - - 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:4412
  - - 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:484

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

00003B09

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003B09
Size 32KB
SHA256 1c604ac436e95a9b3824545a7bfcf015fc953cf93c3318839aff38f92bf9c3e4
MD5 847ee377033777b5421e54d216da2b10
SHA1 0803a7bb8b209013f07ef8a6970a136bd3ff832c
SHA512 e02155fd54f8ea624cd41db66b252b5aa8dbd7d7da57032d8ce239faf6ae902351283455d5105ba225e5056789db7ac085631a1d8f5c41c0dbb8eee343803b26
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpM:OLsF2Kerc64sTiX2IV0DhuM
TLSH
T1B0E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 55af302f342126f4d81502943013803513c6be4a233768b0df2dde9043908db8
MD5 6437d5cf526755f9169489e5cf2b5525
SHA1 656df861d8595c434c7ce2e54cec9ee2c59aba97
SHA512 6883bc34534acd405c0ca7cd191795dc653baec4e61ad3dd0e873e19884b8a64133b02a8068c547bcadbc349c0b593e47c869af9e9be9d50699ec71928b3184d
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpn:OLsF2Kerc64sTiX2IV0Dhun
TLSH
T1C6E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
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