juko | f2a3743444205d19c779f530a22c14eeb837da57577b43b4e54c94c89fb60fc5

General

Target
2026-07-28_057206c50aea2c73bb9767352b62cd18_elex_wannacry.exe
Size 87KB
Sample260728-k3fb4stamd
SHA256 f2a3743444205d19c779f530a22c14eeb837da57577b43b4e54c94c89fb60fc5
MD5 057206c50aea2c73bb9767352b62cd18
SHA1 f34fc1b2e38133f8ac921265a984174f19c3b6a0
SHA512 932f6112fe6e85cf7e1789e208ecef95eb0ad9d5dca305a956cd65bc439c0be5998a7e6d681aea3ccdf9facc4f8058a141ef587fb9db3745d9e41769c6c5b61a
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpj:2Ly2Kerc64CiGIm1K851YO6EQkwpj
TLSH
T19393A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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
behavioral1/memory/3848-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x001400000002428f-5.dat	family_juko
behavioral1/memory/3848-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/676-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x00090000000243ca-15.dat	family_juko
behavioral1/memory/4972-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4972-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-07-28_057206c50aea2c73bb9767352b62cd18_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
676	WINWORD.exe
4972	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-1-5-21-204488895-2999877624-296153668-1000\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
2772	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	2026-07-28_057206c50aea2c73bb9767352b62cd18_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
2772	cmd.exe
4248	PING.EXE
2684	PING.EXE
1128	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1128	PING.EXE
4248	PING.EXE
2684	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3848 wrote to memory of 676	3848	2026-07-28_057206c50aea2c73bb9767352b62cd18_elex_wannacry.exe	86
PID 676 wrote to memory of 2772	676	WINWORD.exe	87
PID 2772 wrote to memory of 4248	2772	cmd.exe	89
PID 2772 wrote to memory of 2684	2772	cmd.exe	90
PID 2772 wrote to memory of 1128	2772	cmd.exe	91
PID 2772 wrote to memory of 4972	2772	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-07-28_057206c50aea2c73bb9767352b62cd18_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-28_057206c50aea2c73bb9767352b62cd18_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3848
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:676
- - 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\00007D86" 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:2772
  - - 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:4248
  - - 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:2684
  - - 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:1128
  - - 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:4972

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00007D86

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007D86
Size 87KB
SHA256 f5536aee710526baefb881da10a9dbb21ee942e3dff46894b2e8d52a077ee889
MD5 f95b72f75b4fb6658682eb95473eff62
SHA1 d5f380528af807fbf9ab77714bb0c5bb302f6f79
SHA512 b839bb16c27bee8d5a3bb384bba79d789cd49b32b185a208f00ea8cea7638c571a76f3378aa7fcc4c57dbc30c9c1f6c97380aa4e30fea5f5dc5458639e6e8f2b
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpP:2Ly2Kerc64CiGIm1K851YO6EQkwpP
TLSH
T14B93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 f2a3743444205d19c779f530a22c14eeb837da57577b43b4e54c94c89fb60fc5
MD5 057206c50aea2c73bb9767352b62cd18
SHA1 f34fc1b2e38133f8ac921265a984174f19c3b6a0
SHA512 932f6112fe6e85cf7e1789e208ecef95eb0ad9d5dca305a956cd65bc439c0be5998a7e6d681aea3ccdf9facc4f8058a141ef587fb9db3745d9e41769c6c5b61a
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpj:2Ly2Kerc64CiGIm1K851YO6EQkwpj
TLSH
T19393A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/676-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3848-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3848-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4972-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4972-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads