juko | 762b76106d2e87753e08737493c7698e72c35daf07158747d3e0ef0a145ba402

General

Target
2026-05-27_3b5f516f6d977ce5fb0da9dc81b0ffd1_elex_wannacry.exe
Size 40KB
Sample260527-e3txlshv8v
SHA256 762b76106d2e87753e08737493c7698e72c35daf07158747d3e0ef0a145ba402
MD5 3b5f516f6d977ce5fb0da9dc81b0ffd1
SHA1 7f95cd243f36f5eb0ab2a542900c583bededc449
SHA512 e90cd9d213d92856599ab23ad1c59a6a22eb3a278acf7714376786357193c1ee498d87b97caf8ef468b33d63fd3dd45be42480c3f9c066289e5cdc57f68c9984
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7tog:rLsF2Kerc64sTiX2IV0DRGg
TLSH
T1B0032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF75ECE
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/0x002000000002b349-4.dat	family_juko
behavioral2/files/0x001c00000002b47f-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4956	WINWORD.exe
1832	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-1-5-21-2654269261-3199571979-4291878722-1000\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	2026-05-27_3b5f516f6d977ce5fb0da9dc81b0ffd1_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
3652	cmd.exe
3636	PING.EXE
3468	PING.EXE
3764	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3764	PING.EXE
3636	PING.EXE
3468	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4712 wrote to memory of 4956	4712	2026-05-27_3b5f516f6d977ce5fb0da9dc81b0ffd1_elex_wannacry.exe	81
PID 4956 wrote to memory of 3652	4956	WINWORD.exe	82
PID 3652 wrote to memory of 3636	3652	cmd.exe	84
PID 3652 wrote to memory of 3468	3652	cmd.exe	85
PID 3652 wrote to memory of 3764	3652	cmd.exe	86
PID 3652 wrote to memory of 1832	3652	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-05-27_3b5f516f6d977ce5fb0da9dc81b0ffd1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-27_3b5f516f6d977ce5fb0da9dc81b0ffd1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4712
- 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:4956
- - 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\00003734" 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:3652
  - - 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:3636
  - - 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:3468
  - - 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:3764
  - - 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:1832

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

00003734

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003734
Size 40KB
SHA256 f77a73b0f9f7646a54400d1c7a864e1bd4dbdf1e139df45674f4b9acb2256805
MD5 6d9781ce5478fc4d4410033c701fe86c
SHA1 1f8db5b5e95aaaf10f4d1bc83bca6ca44ef1e6fa
SHA512 92c16cf82eef17a74abf76f76acbb4a8381dbdfcedadbe992c39a15f05c15e2b54d2313fdc847cb1d960f1794f14f3f59518342eeafb9f458663c47df2e10b1a
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7toL:rLsF2Kerc64sTiX2IV0DRGL
TLSH
T1E5032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF74ECE
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 40KB
SHA256 762b76106d2e87753e08737493c7698e72c35daf07158747d3e0ef0a145ba402
MD5 3b5f516f6d977ce5fb0da9dc81b0ffd1
SHA1 7f95cd243f36f5eb0ab2a542900c583bededc449
SHA512 e90cd9d213d92856599ab23ad1c59a6a22eb3a278acf7714376786357193c1ee498d87b97caf8ef468b33d63fd3dd45be42480c3f9c066289e5cdc57f68c9984
SSDEEP 768:hZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNWkr7tog:rLsF2Kerc64sTiX2IV0DRGg
TLSH
T1B0032A2B2AA47051C59320B0F9591F34C83E9DB5016BB062F7417B6A28B6D63CF75ECE
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