juko | 863fe6f6df317c515562c126a28500d3e00fff323cb933b0095386e3bf125216

General

Target
2026-08-05_e66e795ef4ddc261b3894389bb2863f9_elex_wannacry.exe
Size 53KB
Sample260805-fa6alsap2z
SHA256 863fe6f6df317c515562c126a28500d3e00fff323cb933b0095386e3bf125216
MD5 e66e795ef4ddc261b3894389bb2863f9
SHA1 fe2c2633157dd7961e2f46d2259c3498e1f8c17d
SHA512 7a168d2d3ad3ff31f743f35d028236f5069132912de9abc889adda176541fcbed51bf253972697568f8ce11da17a4d9192da88dc8d21434d92762fab2f553de7
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2M:3Ly2Kerc64CiGIm1tcBMUOOFM
TLSH
T173335C176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000a000000019cb5-4.dat	family_juko
behavioral2/files/0x001000000001c4ca-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5584	WINWORD.exe
3428	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-1-5-21-2246396966-3025826688-3847171515-1000\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
4816	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	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	2026-08-05_e66e795ef4ddc261b3894389bb2863f9_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
4816	cmd.exe
4152	PING.EXE
5104	PING.EXE
3316	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3316	PING.EXE
4152	PING.EXE
5104	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 808 wrote to memory of 5584	808	2026-08-05_e66e795ef4ddc261b3894389bb2863f9_elex_wannacry.exe	89
PID 5584 wrote to memory of 4816	5584	WINWORD.exe	90
PID 4816 wrote to memory of 4152	4816	cmd.exe	92
PID 4816 wrote to memory of 5104	4816	cmd.exe	93
PID 4816 wrote to memory of 3316	4816	cmd.exe	94
PID 4816 wrote to memory of 3428	4816	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-05_e66e795ef4ddc261b3894389bb2863f9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-05_e66e795ef4ddc261b3894389bb2863f9_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:808
- 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:5584
- - 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\00002036" 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:4816
  - - 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:4152
  - - 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:5104
  - - 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:3316
  - - 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:3428

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

00002036

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002036
Size 53KB
SHA256 64ae8db75e1a39f482b5fbc83f4da0abda8926f7b5c951a89d2deff925ebd0e9
MD5 408139305a6e3924ea8607a2ffe24bcb
SHA1 ea0c723a12d29d6e0f3c682fff3a0b89bd611a1f
SHA512 412c56f476698ef433e91aa8448d5e4cae07b51047d429016f6a2c8db1d2ed3903e82fa196fb26d87f13061a769ee09857a457c3448736e1c2872505f6c02aff
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2J:3Ly2Kerc64CiGIm1tcBMUOOFJ
TLSH
T164335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 863fe6f6df317c515562c126a28500d3e00fff323cb933b0095386e3bf125216
MD5 e66e795ef4ddc261b3894389bb2863f9
SHA1 fe2c2633157dd7961e2f46d2259c3498e1f8c17d
SHA512 7a168d2d3ad3ff31f743f35d028236f5069132912de9abc889adda176541fcbed51bf253972697568f8ce11da17a4d9192da88dc8d21434d92762fab2f553de7
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2M:3Ly2Kerc64CiGIm1tcBMUOOFM
TLSH
T173335C176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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