juko | 7892901d7a3997dc20b3cdda929502f06428d28884c202b7a9ade20aefecfdd7

General

Target
2026-08-05_f5ca362f3b53356c8b4efdf8f4fca25e_elex_wannacry.exe
Size 49KB
Sample260805-fal7qsde89
SHA256 7892901d7a3997dc20b3cdda929502f06428d28884c202b7a9ade20aefecfdd7
MD5 f5ca362f3b53356c8b4efdf8f4fca25e
SHA1 c697bb45c06d17a5951ad66972271911a7aefac0
SHA512 62c331166ce7ee3d0b4c030a9b15c0f5120bcdf9a1538b771b26c93309b8d2452eff23850d0a86bc467ff0af9491ab51130218b772a953462b1a60073c5ff97c
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2g:4Ly2Kerc64CiGImVu8p4kojWh2g
TLSH
T149334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4712-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001b847-5.dat	family_juko
behavioral2/memory/4712-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2292-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c584-13.dat	family_juko
behavioral2/memory/1568-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1568-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2292	WINWORD.exe
1568	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-1-5-21-3797332335-34111092-3597280141-1000\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
3212	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	2026-08-05_f5ca362f3b53356c8b4efdf8f4fca25e_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
3212	cmd.exe
5084	PING.EXE
2912	PING.EXE
3024	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5084	PING.EXE
2912	PING.EXE
3024	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4712 wrote to memory of 2292	4712	2026-08-05_f5ca362f3b53356c8b4efdf8f4fca25e_elex_wannacry.exe	89
PID 2292 wrote to memory of 3212	2292	WINWORD.exe	90
PID 3212 wrote to memory of 5084	3212	cmd.exe	92
PID 3212 wrote to memory of 2912	3212	cmd.exe	93
PID 3212 wrote to memory of 3024	3212	cmd.exe	94
PID 3212 wrote to memory of 1568	3212	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-05_f5ca362f3b53356c8b4efdf8f4fca25e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-05_f5ca362f3b53356c8b4efdf8f4fca25e_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:2292
- - 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\00006DBE" 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:3212
  - - 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:5084
  - - 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:2912
  - - 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:3024
  - - 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:1568

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

00006DBE

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006DBE
Size 49KB
SHA256 f6207c2fea4bdbcf45f121eb39b55e7b91faaf91fc4cbcdc56815b8c504ca749
MD5 675636f4492c0b98a661277cc990ead7
SHA1 91db9b14e16124058733552456f404d211b5600c
SHA512 c9069b6f7a937cbc65c4ac2b8748907bb5e1d0d3c6ef77df8fe74fcdf653127c0409b6dd8503468fadcf71e81e6f9e83f5f96bcc394f774269ecdac14caff7ae
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2T:4Ly2Kerc64CiGImVu8p4kojWh2T
TLSH
T192334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 7892901d7a3997dc20b3cdda929502f06428d28884c202b7a9ade20aefecfdd7
MD5 f5ca362f3b53356c8b4efdf8f4fca25e
SHA1 c697bb45c06d17a5951ad66972271911a7aefac0
SHA512 62c331166ce7ee3d0b4c030a9b15c0f5120bcdf9a1538b771b26c93309b8d2452eff23850d0a86bc467ff0af9491ab51130218b772a953462b1a60073c5ff97c
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2g:4Ly2Kerc64CiGImVu8p4kojWh2g
TLSH
T149334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1568-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1568-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2292-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4712-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4712-9-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads