juko | f6e8875c408df71cf5706071763acfbda70dd683d94104ad17c6b14fa85eda8c

General

Target
2026-10-10_435c1fe35c4a1ebceb627637b9a02cba_elex_wannacry.exe
Size 37KB
Sample261011-s8mmdatvfs
SHA256 f6e8875c408df71cf5706071763acfbda70dd683d94104ad17c6b14fa85eda8c
MD5 435c1fe35c4a1ebceb627637b9a02cba
SHA1 d5ef45117b2789d1a5b4a529dd2085ea4aa750e3
SHA512 2aa42a3b551dd4f31d14d3f04ccee0758beb7af49cc0c0a4f0fe47135d4f31b1a2e8f26e747b3e287584ea188efd9f4acf666ee101f30000b23df57591541e2e
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9bSOOl5:3LsF2Kerc64sTiX2IV0D5tcz9+OOb
TLSH
T13703491B69A46042C1A312B0FD991F35C57E9DB814E7B052A744BA5C2CB2E63DF70ECE
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
behavioral1/files/0x000700000001e3e5-3.dat	family_juko
behavioral1/files/0x0009000000024469-12.dat	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-1-5-21-895009113-1202185046-1686627690-1000\Control Panel\International\Geo\Nation	2026-10-10_435c1fe35c4a1ebceb627637b9a02cba_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-895009113-1202185046-1686627690-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1620	WINWORD.exe
2444	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-1-5-21-895009113-1202185046-1686627690-1000\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
1776	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-10_435c1fe35c4a1ebceb627637b9a02cba_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

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
2312	PING.EXE
3876	PING.EXE
4032	PING.EXE
1776	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2312	PING.EXE
3876	PING.EXE
4032	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2752 wrote to memory of 1620	2752	2026-10-10_435c1fe35c4a1ebceb627637b9a02cba_elex_wannacry.exe	89
PID 1620 wrote to memory of 1776	1620	WINWORD.exe	90
PID 1776 wrote to memory of 2312	1776	cmd.exe	92
PID 1776 wrote to memory of 3876	1776	cmd.exe	94
PID 1776 wrote to memory of 4032	1776	cmd.exe	97
PID 1776 wrote to memory of 2444	1776	cmd.exe	100

C:\Users\Admin\AppData\Local\Temp\2026-10-10_435c1fe35c4a1ebceb627637b9a02cba_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-10_435c1fe35c4a1ebceb627637b9a02cba_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2752
- 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:1620
- - 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\00003ACB" 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:1776
  - - 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:2312
  - - 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:3876
  - - 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:4032
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:2444

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00003ACB

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003ACB
Size 37KB
SHA256 769548b357fe4084bff1308d7cfb5845ba88c83cd1b99741acae74b292947ac5
MD5 18770f90168a82eb68779ba07b759a66
SHA1 059ae20c9fed5213b3090dda817c0a028dbc6468
SHA512 cfeda2f90e1bf97613734c3b3ec50f1bb5becae3994d240a7767e39d052aeda7400daa39b7d6b1cfbcf130a0d6a531ae0e5e531e6d3e8dc8697f366783dbe249
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9bSOOll:3LsF2Kerc64sTiX2IV0D5tcz9+OOD
TLSH
T14003491B69A46042C1A312B0FD991F35857E9DB814E7B052A744BA5C2CB2E63DF70ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 f6e8875c408df71cf5706071763acfbda70dd683d94104ad17c6b14fa85eda8c
MD5 435c1fe35c4a1ebceb627637b9a02cba
SHA1 d5ef45117b2789d1a5b4a529dd2085ea4aa750e3
SHA512 2aa42a3b551dd4f31d14d3f04ccee0758beb7af49cc0c0a4f0fe47135d4f31b1a2e8f26e747b3e287584ea188efd9f4acf666ee101f30000b23df57591541e2e
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9bSOOl5:3LsF2Kerc64sTiX2IV0D5tcz9+OOb
TLSH
T13703491B69A46042C1A312B0FD991F35C57E9DB814E7B052A744BA5C2CB2E63DF70ECE
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