juko | 034e4029f46dcf55bb9802f0ce17448f589e1545df72ee3655bda05911e5fbbf

General

Target
2026-07-28_340b3db007d6f4dbefe05320e3b06de6_elex_wannacry.exe
Size 87KB
Sample260728-28mrtabp5v
SHA256 034e4029f46dcf55bb9802f0ce17448f589e1545df72ee3655bda05911e5fbbf
MD5 340b3db007d6f4dbefe05320e3b06de6
SHA1 f66f37b93636e354bcd51b227e46c482a4c1cd47
SHA512 472741aebcb114aed3c551a2516b173d52152f2287f45fddbedeeb113af2ec89e9e5bbc817141722968e40efdbdf2dcaa97901aba06f1e0300f49baad51f65b4
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpd:2Ly2Kerc64CiGIm1K851YO6EQkwpd
TLSH
T10D93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/5672-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e000000016cdc-5.dat	family_juko
behavioral2/memory/5672-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5708-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x0003000000008f2c-13.dat	family_juko
behavioral2/memory/1380-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1380-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5708	WINWORD.exe
1380	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-1-5-21-552508041-2681165170-3229858294-1000\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
1860	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-28_340b3db007d6f4dbefe05320e3b06de6_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

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
4976	PING.EXE
5080	PING.EXE
1860	cmd.exe
5208	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5208	PING.EXE
4976	PING.EXE
5080	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5672 wrote to memory of 5708	5672	2026-07-28_340b3db007d6f4dbefe05320e3b06de6_elex_wannacry.exe	89
PID 5708 wrote to memory of 1860	5708	WINWORD.exe	90
PID 1860 wrote to memory of 5208	1860	cmd.exe	92
PID 1860 wrote to memory of 4976	1860	cmd.exe	93
PID 1860 wrote to memory of 5080	1860	cmd.exe	94
PID 1860 wrote to memory of 1380	1860	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-28_340b3db007d6f4dbefe05320e3b06de6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-28_340b3db007d6f4dbefe05320e3b06de6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5672
- 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:5708
- - 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\000057C6" 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:1860
  - - 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:5208
  - - 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:4976
  - - 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:5080
  - - 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:1380

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

000057C6

Path C:\Users\Admin\AppData\Roaming\Mozilla\000057C6
Size 87KB
SHA256 5eacbc1f9f7a8fba41a5307951be15f504ca31cdd0bc554e1bc9cc053418e275
MD5 bae89ffdcb14845e655f3254df3fbbb5
SHA1 9c49c3b4095bb963226423eb0d04bba173659d13
SHA512 4f859eae0b0a673462af25466d11a3e66d04f7cd2a107d27d8abefcb2d431620ce003adcf9619daa7104db54e0aef48e2712658d1505c6d0aba3bed070055daf
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpa:2Ly2Kerc64CiGIm1K851YO6EQkwpa
TLSH
T12393A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 034e4029f46dcf55bb9802f0ce17448f589e1545df72ee3655bda05911e5fbbf
MD5 340b3db007d6f4dbefe05320e3b06de6
SHA1 f66f37b93636e354bcd51b227e46c482a4c1cd47
SHA512 472741aebcb114aed3c551a2516b173d52152f2287f45fddbedeeb113af2ec89e9e5bbc817141722968e40efdbdf2dcaa97901aba06f1e0300f49baad51f65b4
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpd:2Ly2Kerc64CiGIm1K851YO6EQkwpd
TLSH
T10D93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1380-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1380-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5672-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5672-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5708-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads