juko | bedfbe4fba7f92f930c3702e0b7360509dd52cf7f81f507bbad69b95fd0df8aa

General

Target
2026-05-11_1d7f4e3ccdb608bb4f08b6f5a9eb5be2_elex_wannacry.exe
Size 32KB
Sample260511-e43wxaew9p
SHA256 bedfbe4fba7f92f930c3702e0b7360509dd52cf7f81f507bbad69b95fd0df8aa
MD5 1d7f4e3ccdb608bb4f08b6f5a9eb5be2
SHA1 4d550a8894540415184fd51d47e991785bf34b52
SHA512 d056d70df6933ab3a72ca673cb757a62a08c60ab00494d841009e66317382a66c16f22b9308a98185bebd3de274be87e7ebd92ddd2e238df93481830746a932e
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpi:OLsF2Kerc64sTiX2IV0Dhui
TLSH
T108E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
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/0x000d00000002ad68-4.dat	family_juko
behavioral2/files/0x001b00000002b451-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5128	WINWORD.exe
1168	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-1-5-21-600123060-2148212387-2211176695-1000\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	2026-05-11_1d7f4e3ccdb608bb4f08b6f5a9eb5be2_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
5056	cmd.exe
716	PING.EXE
4224	PING.EXE
2428	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
716	PING.EXE
4224	PING.EXE
2428	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1316 wrote to memory of 5128	1316	2026-05-11_1d7f4e3ccdb608bb4f08b6f5a9eb5be2_elex_wannacry.exe	78
PID 5128 wrote to memory of 5056	5128	WINWORD.exe	79
PID 5056 wrote to memory of 716	5056	cmd.exe	81
PID 5056 wrote to memory of 4224	5056	cmd.exe	82
PID 5056 wrote to memory of 2428	5056	cmd.exe	83
PID 5056 wrote to memory of 1168	5056	cmd.exe	84

C:\Users\Admin\AppData\Local\Temp\2026-05-11_1d7f4e3ccdb608bb4f08b6f5a9eb5be2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-11_1d7f4e3ccdb608bb4f08b6f5a9eb5be2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1316
- 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:5128
- - 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\00005227" 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:5056
  - - 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:716
  - - 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:4224
  - - 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:2428
  - - 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:1168

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

00005227

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005227
Size 32KB
SHA256 bb9e1c61c83a51a5becb02ddc75e176f1503277e93a3a2b5e384c9ccb92d8625
MD5 9d2365f011ae0973e481711bd9e8ea46
SHA1 91e262cdbd06d723fcbd619f055e4c9ad93c615f
SHA512 2a234b54b31349da1aa2fee1e46c3c9a436018b557d3520e76a13f380c3b970b5ffb5c6b84dad42f10abefc32aa8d23b4cae9fd242858fc492077040a5a00c35
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpB:OLsF2Kerc64sTiX2IV0DhuB
TLSH
T136E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 bedfbe4fba7f92f930c3702e0b7360509dd52cf7f81f507bbad69b95fd0df8aa
MD5 1d7f4e3ccdb608bb4f08b6f5a9eb5be2
SHA1 4d550a8894540415184fd51d47e991785bf34b52
SHA512 d056d70df6933ab3a72ca673cb757a62a08c60ab00494d841009e66317382a66c16f22b9308a98185bebd3de274be87e7ebd92ddd2e238df93481830746a932e
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpi:OLsF2Kerc64sTiX2IV0Dhui
TLSH
T108E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
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