juko | 9ee9b2e5942cef2027033c9e1c0a917caf6563d339a5bec08f1d0c4c38a6796d

General

Target
2026-08-03_47e865386a900d1290461ac7f42b4e40_elex_wannacry.exe
Size 64KB
Sample260804-pb7phazbnd
SHA256 9ee9b2e5942cef2027033c9e1c0a917caf6563d339a5bec08f1d0c4c38a6796d
MD5 47e865386a900d1290461ac7f42b4e40
SHA1 7dd2dfc9e3c666d93e3b89194ae538f72a0b4cc1
SHA512 953dfa27fac64f96e2a755422a752b9021269f19ea17c53381471c5e62d9987627b630382cfd6d070c4c217457237dca947bb4beae0f7439019285184f08e764
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uD:sLy2Kerc64CiGIm8so28D
TLSH
T114535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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
behavioral2/files/0x002100000001c3fd-4.dat	family_juko
behavioral2/files/0x000e00000001c51f-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4464	WINWORD.exe
4732	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-1-5-21-2115213192-531537726-3295841909-1000\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
4672	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	2026-08-03_47e865386a900d1290461ac7f42b4e40_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
4672	cmd.exe
4956	PING.EXE
3096	PING.EXE
2148	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3096	PING.EXE
2148	PING.EXE
4956	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2800 wrote to memory of 4464	2800	2026-08-03_47e865386a900d1290461ac7f42b4e40_elex_wannacry.exe	88
PID 4464 wrote to memory of 4672	4464	WINWORD.exe	89
PID 4672 wrote to memory of 4956	4672	cmd.exe	91
PID 4672 wrote to memory of 3096	4672	cmd.exe	92
PID 4672 wrote to memory of 2148	4672	cmd.exe	93
PID 4672 wrote to memory of 4732	4672	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-03_47e865386a900d1290461ac7f42b4e40_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_47e865386a900d1290461ac7f42b4e40_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2800
- 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:4464
- - 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\000021D7" 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:4672
  - - 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:4956
  - - 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:3096
  - - 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:2148
  - - 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:4732

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

000021D7

Path C:\Users\Admin\AppData\Roaming\Mozilla\000021D7
Size 64KB
SHA256 44ec78d989907bffe18018be3808fbf2f2c2a81a79286bc6e1d1f832f5c7296c
MD5 e7d48f5a382538af2ce4ab0d94d084d4
SHA1 53d0d673145839aa7c7e46c519b5856b3a14975b
SHA512 f0975d0bfda7a62917945102f6da3a81f658353372cb2b0a5c386e0e5c2a6095effe3cbcf8708a82b98440d85bba636da72a7e3e967054438f9caf00d91bda9c
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u3:sLy2Kerc64CiGIm8so283
TLSH
T113535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 9ee9b2e5942cef2027033c9e1c0a917caf6563d339a5bec08f1d0c4c38a6796d
MD5 47e865386a900d1290461ac7f42b4e40
SHA1 7dd2dfc9e3c666d93e3b89194ae538f72a0b4cc1
SHA512 953dfa27fac64f96e2a755422a752b9021269f19ea17c53381471c5e62d9987627b630382cfd6d070c4c217457237dca947bb4beae0f7439019285184f08e764
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uD:sLy2Kerc64CiGIm8so28D
TLSH
T114535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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