juko | 456ab0ecc56412b34e38092f4904e1a73df050ed5c0a7064e1fd84de419e5635

General

Target
2026-07-18_28c2954987af3be33e6c9018d9439b4b_elex_wannacry.exe
Size 49KB
Sample260718-kfdvrshs4w
SHA256 456ab0ecc56412b34e38092f4904e1a73df050ed5c0a7064e1fd84de419e5635
MD5 28c2954987af3be33e6c9018d9439b4b
SHA1 300659255124dca1be2ce19388d299a7a3e2027f
SHA512 3bf12d9717e232a6d1b64c75c1884d7305fce8bff4868370eb90c64d0dd4418fe8a597b5d3ef0eb9d6438039df031424beff3f65a13cd99d45a258ded9ceab1d
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2r:VLy2Kerc64CiGImVucp4kojWh2r
TLSH
T159334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/4428-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000019caa-4.dat	family_juko
behavioral2/memory/4428-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1356-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c61c-13.dat	family_juko
behavioral2/memory/4656-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4656-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1356	WINWORD.exe
4656	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-1-5-21-2301830172-776172150-2531349243-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
1708	cmd.exe

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	2026-07-18_28c2954987af3be33e6c9018d9439b4b_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
2576	PING.EXE
1708	cmd.exe
3708	PING.EXE
2940	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3708	PING.EXE
2940	PING.EXE
2576	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4428 wrote to memory of 1356	4428	2026-07-18_28c2954987af3be33e6c9018d9439b4b_elex_wannacry.exe	89
PID 1356 wrote to memory of 1708	1356	WINWORD.exe	90
PID 1708 wrote to memory of 3708	1708	cmd.exe	92
PID 1708 wrote to memory of 2940	1708	cmd.exe	93
PID 1708 wrote to memory of 2576	1708	cmd.exe	94
PID 1708 wrote to memory of 4656	1708	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-18_28c2954987af3be33e6c9018d9439b4b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-18_28c2954987af3be33e6c9018d9439b4b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4428
- 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:1356
- - 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\000052F6" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:1708
  - - 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:3708
  - - 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:2940
  - - 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:2576
  - - 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:4656

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

000052F6

Path C:\Users\Admin\AppData\Roaming\Mozilla\000052F6
Size 49KB
SHA256 5da0a12467774dc79cef8492044a18d870db83d42650ef555ccd482cdfbb2bde
MD5 d93501db7f43fee95876141955d7d622
SHA1 9ec1873466f977de571f25d79d8f271747d5c9ad
SHA512 478923afeadfce2f0db16763ca9f8148f9b16af0bc11bda19075e39e06d9a5f866819ba851052c2a0873c591513832e058189990a8da7fd367d2066920cd3e66
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2L:VLy2Kerc64CiGImVucp4kojWh2L
TLSH
T1E7334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 456ab0ecc56412b34e38092f4904e1a73df050ed5c0a7064e1fd84de419e5635
MD5 28c2954987af3be33e6c9018d9439b4b
SHA1 300659255124dca1be2ce19388d299a7a3e2027f
SHA512 3bf12d9717e232a6d1b64c75c1884d7305fce8bff4868370eb90c64d0dd4418fe8a597b5d3ef0eb9d6438039df031424beff3f65a13cd99d45a258ded9ceab1d
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2r:VLy2Kerc64CiGImVucp4kojWh2r
TLSH
T159334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1356-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4428-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4428-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4656-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4656-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads