juko | 8f2d13e8d084b2be772a4e72875c99c4637811a33c190c62c8aab97e07cc5ea3

General

Target
2026-07-28_9d9e476bdc9175ee439a85ab5b3875f4_elex_wannacry.exe
Size 87KB
Sample260728-2ckycaxfpc
SHA256 8f2d13e8d084b2be772a4e72875c99c4637811a33c190c62c8aab97e07cc5ea3
MD5 9d9e476bdc9175ee439a85ab5b3875f4
SHA1 3c085ec9dab2057945242f80de86bb3d46ede54b
SHA512 5b9f5e26ab1b3e1cbca973da159b7d1820abead8fc4cf520ffb831d180b4b1b7192337bbaf5d09707ed15361aa2a0abbc9c8c9991fa9628a972307e1537067b1
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpC:2Ly2Kerc64CiGIm1K851YO6EQkwpC
TLSH
T18B93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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 8 IoCs

resource	yara_rule
behavioral2/memory/4744-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000c00000001b88f-5.dat	family_juko
behavioral2/memory/4420-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4744-10-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4420-13-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c4ed-14.dat	family_juko
behavioral2/memory/3036-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3036-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4420	WINWORD.exe
3036	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
5368	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-28_9d9e476bdc9175ee439a85ab5b3875f4_elex_wannacry.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
1616	PING.EXE
5368	cmd.exe
4680	PING.EXE
4728	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4680	PING.EXE
4728	PING.EXE
1616	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4744 wrote to memory of 4420	4744	2026-07-28_9d9e476bdc9175ee439a85ab5b3875f4_elex_wannacry.exe	89
PID 4420 wrote to memory of 5368	4420	WINWORD.exe	90
PID 5368 wrote to memory of 4680	5368	cmd.exe	92
PID 5368 wrote to memory of 4728	5368	cmd.exe	93
PID 5368 wrote to memory of 1616	5368	cmd.exe	94
PID 5368 wrote to memory of 3036	5368	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-28_9d9e476bdc9175ee439a85ab5b3875f4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-28_9d9e476bdc9175ee439a85ab5b3875f4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4744
- 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:4420
- - 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\000030D4" 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:5368
  - - 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:4680
  - - 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:4728
  - - 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:1616
  - - 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:3036

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

000030D4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000030D4
Size 87KB
SHA256 ea654b7214ac0b45d8af40d431331fbda59be2bf79d1a5d9ed04a9bbd640a310
MD5 545c61952fbe6acd05acb1fce11c5b50
SHA1 4aa5b4c65c2ac5cb5acea6ae3dcdcdb168b5401c
SHA512 44e0f93c36fed179b73ecbf09fd7a8fa134282a0ea659a23b60ef6209d73fec2cb44a188c01cae92d8d5a8b05921124a2e01bfef12c1055dff456cae1ecbc332
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp/:2Ly2Kerc64CiGIm1K851YO6EQkwp/
TLSH
T16C93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 8f2d13e8d084b2be772a4e72875c99c4637811a33c190c62c8aab97e07cc5ea3
MD5 9d9e476bdc9175ee439a85ab5b3875f4
SHA1 3c085ec9dab2057945242f80de86bb3d46ede54b
SHA512 5b9f5e26ab1b3e1cbca973da159b7d1820abead8fc4cf520ffb831d180b4b1b7192337bbaf5d09707ed15361aa2a0abbc9c8c9991fa9628a972307e1537067b1
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpC:2Ly2Kerc64CiGIm1K851YO6EQkwpC
TLSH
T18B93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3036-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3036-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4420-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4420-13-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4744-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4744-10-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads