juko | 48ed074fc0b005d6dbd604aa6b73886538c219ecee687e6efad08f64706d4429

General

Target
2026-07-16_577a9f04f35172bd5111ed275a65b569_elex_wannacry.exe
Size 87KB
Sample260716-ddmxbsfs5x
SHA256 48ed074fc0b005d6dbd604aa6b73886538c219ecee687e6efad08f64706d4429
MD5 577a9f04f35172bd5111ed275a65b569
SHA1 1b1c32ef00201d302b99dbd98e86c399e9b782f2
SHA512 a34ca57563b6bdce5297c0d51896e6e09b21e8eae100cf48989ec686a27ebdd4ea2628252c3bfc2cf17583db1d835d9b492317cb72077dcc131af460e890f320
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp6:2Ly2Kerc64CiGIm1K851YO6EQkwp6
TLSH
T17193A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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 7 IoCs

resource	yara_rule
behavioral2/memory/2552-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x0009000000019cc1-5.dat	family_juko
behavioral2/memory/2552-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4360-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c516-13.dat	family_juko
behavioral2/memory/2692-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2692-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4360	WINWORD.exe
2692	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-1-5-21-1875162379-3804078649-638427191-1000\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	2026-07-16_577a9f04f35172bd5111ed275a65b569_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
4912	PING.EXE
6060	PING.EXE
840	cmd.exe
4888	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4912	PING.EXE
6060	PING.EXE
4888	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2552 wrote to memory of 4360	2552	2026-07-16_577a9f04f35172bd5111ed275a65b569_elex_wannacry.exe	87
PID 4360 wrote to memory of 840	4360	WINWORD.exe	88
PID 840 wrote to memory of 4888	840	cmd.exe	90
PID 840 wrote to memory of 4912	840	cmd.exe	91
PID 840 wrote to memory of 6060	840	cmd.exe	92
PID 840 wrote to memory of 2692	840	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-16_577a9f04f35172bd5111ed275a65b569_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-16_577a9f04f35172bd5111ed275a65b569_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2552
- 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:4360
- - 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\00000FAB" 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:840
  - - 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:4888
  - - 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:4912
  - - 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:6060
  - - 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:2692

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

00000FAB

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000FAB
Size 87KB
SHA256 668c1250971bd29800b8ee7ad99986c77910e12cbefbe50e8cc8a533817a2de5
MD5 fff6e96266ddb6473b4f41e7356e3efc
SHA1 dc5973db62aa91cfa8aa60d6c20f01a754f48668
SHA512 9fc513943a77ae94bace76e71f45dd49eed5da23ffc5c35fde4e1a4a071f1532c0230a87ab635be1adcee2b63f70806846c417fe1a2df4821d80ea87d70a4a9f
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpL:2Ly2Kerc64CiGIm1K851YO6EQkwpL
TLSH
T13A93A1763A259190C48BD138E8155AA0B932DCF52FF71303E7417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 48ed074fc0b005d6dbd604aa6b73886538c219ecee687e6efad08f64706d4429
MD5 577a9f04f35172bd5111ed275a65b569
SHA1 1b1c32ef00201d302b99dbd98e86c399e9b782f2
SHA512 a34ca57563b6bdce5297c0d51896e6e09b21e8eae100cf48989ec686a27ebdd4ea2628252c3bfc2cf17583db1d835d9b492317cb72077dcc131af460e890f320
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp6:2Ly2Kerc64CiGIm1K851YO6EQkwp6
TLSH
T17193A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2552-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2552-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2692-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2692-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4360-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads