juko | 1a478e84035b7174be633fdbcabbca94c8f21862882ec41d758d328471c2a505

General

Target
2026-10-06_96d3b52427c0aae186f36744c33833d7_elex_wannacry.exe
Size 47KB
Sample261007-23b35afw2t
SHA256 1a478e84035b7174be633fdbcabbca94c8f21862882ec41d758d328471c2a505
MD5 96d3b52427c0aae186f36744c33833d7
SHA1 c7058abde9c7749d0dc31161400528284864b2c6
SHA512 4837736d9eb2736be45e6970bb37303f9af1235bcde8a55ca83110f6cfdd5a00edea0be922e24ba0bf4528a4bdc18d1ed7ed060bcaa4a5c885d0b3d6addcbc65
SSDEEP 768:8ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqSNPWQH6tXeUa0dX6w:ALsF2Kerc64sTiX2IV0DZZTow
TLSH
T1FF235A1BFE616052C18611B0FD699F3985799CB0047BB062B780BB1D28B2DA3CF709CD
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/0x000300000002146a-3.dat	family_juko
behavioral1/files/0x000400000002146c-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-1-5-21-240542094-4193773837-3211495583-1000\Control Panel\International\Geo\Nation	2026-10-06_96d3b52427c0aae186f36744c33833d7_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-240542094-4193773837-3211495583-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2248	WINWORD.exe
4728	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-1-5-21-240542094-4193773837-3211495583-1000\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
4904	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	2026-10-06_96d3b52427c0aae186f36744c33833d7_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
2164	PING.EXE
4464	PING.EXE
4904	cmd.exe
3392	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3392	PING.EXE
2164	PING.EXE
4464	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2460 wrote to memory of 2248	2460	2026-10-06_96d3b52427c0aae186f36744c33833d7_elex_wannacry.exe	87
PID 2248 wrote to memory of 4904	2248	WINWORD.exe	88
PID 4904 wrote to memory of 3392	4904	cmd.exe	90
PID 4904 wrote to memory of 2164	4904	cmd.exe	93
PID 4904 wrote to memory of 4464	4904	cmd.exe	96
PID 4904 wrote to memory of 4728	4904	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\2026-10-06_96d3b52427c0aae186f36744c33833d7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-06_96d3b52427c0aae186f36744c33833d7_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2460
- 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:2248
- - 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\000052C1" 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:4904
  - - 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:3392
  - - 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:2164
  - - 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:4464
  - - 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:4728

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

000052C1

Path C:\Users\Admin\AppData\Roaming\Mozilla\000052C1
Size 47KB
SHA256 8f8eb24806511e2f7dc3e1852621058fde2ca6bfadac00e402c4a3dbaa3d7f6b
MD5 c7c84505677d8cda948fc6f7694b03fa
SHA1 ba5915a00f7f837f787b3ccc9d63ef45ea007d9e
SHA512 df644dad8e0efe98951f950b98412b5a6d45b71fd4fe39bc6cf30e0bcd998437fafc7ebfca72eed66795f35eccd219d079c17fa208db09e070c2bcfcf3f38162
SSDEEP 768:8ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqSNPWQH6tXeUa0dX6P:ALsF2Kerc64sTiX2IV0DZZToP
TLSH
T18E235A1BFE61A052C19611B0FD699F3585799CB4047BB162B780BB1D28B2DA3CF709CD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 1a478e84035b7174be633fdbcabbca94c8f21862882ec41d758d328471c2a505
MD5 96d3b52427c0aae186f36744c33833d7
SHA1 c7058abde9c7749d0dc31161400528284864b2c6
SHA512 4837736d9eb2736be45e6970bb37303f9af1235bcde8a55ca83110f6cfdd5a00edea0be922e24ba0bf4528a4bdc18d1ed7ed060bcaa4a5c885d0b3d6addcbc65
SSDEEP 768:8ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqSNPWQH6tXeUa0dX6w:ALsF2Kerc64sTiX2IV0DZZTow
TLSH
T1FF235A1BFE616052C18611B0FD699F3985799CB0047BB062B780BB1D28B2DA3CF709CD
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