juko | 78f698f2ec0238ca9ceb2ef72729507c7e74d23c473269d36daa945fbda0e913

General

Target
2026-06-05_3e8c82ae7d1f9ecde44af16478a16b74_elex_wannacry.exe
Size 32KB
Sample260605-2dpypaew2s
SHA256 78f698f2ec0238ca9ceb2ef72729507c7e74d23c473269d36daa945fbda0e913
MD5 3e8c82ae7d1f9ecde44af16478a16b74
SHA1 1c2960bf410439f030b9c2efbe116aca42b06451
SHA512 52ddfec6b10569a163eb627de19a7bcbbf69265be53a023bb013e77497848920c7779ffecf713a3988f2b1524a114ff17f497b2d0ae66737bf8eb0c32cc1a5a9
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpC:OLsF2Kerc64sTiX2IV0DhuC
TLSH
T141E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
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/0x001f00000002b276-4.dat	family_juko
behavioral2/files/0x001b00000002b49f-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2892	WINWORD.exe
4832	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	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	2026-06-05_3e8c82ae7d1f9ecde44af16478a16b74_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

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
2616	PING.EXE
3880	PING.EXE
1268	cmd.exe
4428	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2616	PING.EXE
3880	PING.EXE
4428	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2996 wrote to memory of 2892	2996	2026-06-05_3e8c82ae7d1f9ecde44af16478a16b74_elex_wannacry.exe	80
PID 2892 wrote to memory of 1268	2892	WINWORD.exe	81
PID 1268 wrote to memory of 4428	1268	cmd.exe	83
PID 1268 wrote to memory of 2616	1268	cmd.exe	84
PID 1268 wrote to memory of 3880	1268	cmd.exe	85
PID 1268 wrote to memory of 4832	1268	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-06-05_3e8c82ae7d1f9ecde44af16478a16b74_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-05_3e8c82ae7d1f9ecde44af16478a16b74_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2996
- 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:2892
- - 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\00005840" 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:1268
  - - 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:4428
  - - 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:2616
  - - 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:3880
  - - 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:4832

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

00005840

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005840
Size 32KB
SHA256 115504d69fca854de341748de5b167a18b68d3478db087c68d719093f937c1c7
MD5 0d5dc71a2115e35d7e0685abda711ace
SHA1 4194da458c92d535bd796fd399b4c9e11b59dc62
SHA512 4c7a56e3ab072c1f78d5f9642e21cc3f4f1819881288c9ef5e36cea10f00d77e624756ae65cb5d676560b6577bc5ab086f328d29741e666f68617b7ed348147f
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpN:OLsF2Kerc64sTiX2IV0DhuN
TLSH
T1A8E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 78f698f2ec0238ca9ceb2ef72729507c7e74d23c473269d36daa945fbda0e913
MD5 3e8c82ae7d1f9ecde44af16478a16b74
SHA1 1c2960bf410439f030b9c2efbe116aca42b06451
SHA512 52ddfec6b10569a163eb627de19a7bcbbf69265be53a023bb013e77497848920c7779ffecf713a3988f2b1524a114ff17f497b2d0ae66737bf8eb0c32cc1a5a9
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpC:OLsF2Kerc64sTiX2IV0DhuC
TLSH
T141E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
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