juko | 3d90ce2c50ea22efd18dd628fb6124810555fcd9f79a23190ae8087d31313bf4

General

Target
2026-10-22_aaab5d2e47d274af7798291a2918518e_elex_wannacry.exe
Size 48KB
Sample261024-bhbzhswt7k
SHA256 3d90ce2c50ea22efd18dd628fb6124810555fcd9f79a23190ae8087d31313bf4
MD5 aaab5d2e47d274af7798291a2918518e
SHA1 154d56bb3078d6973402d1a6a601e3061d3756eb
SHA512 5d4b519413126456de4047aac65ed211439bc9248c2418f3a25c491de8ae8cd96ad2206a1fbad204c26ef5984839968bb0b510a02e35325ce53266234b65c42d
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8+:bLy2Kerc64CiGImav42j0m
TLSH
T154234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/2616-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001000000001b2f6-4.dat	family_juko
behavioral2/memory/2616-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3696-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c600-13.dat	family_juko
behavioral2/memory/792-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/792-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3696	WINWORD.exe
792	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-1-5-21-53044966-3830981193-2402648431-1000\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
4540	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	2026-10-22_aaab5d2e47d274af7798291a2918518e_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
4540	cmd.exe
2328	PING.EXE
5136	PING.EXE
4064	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2328	PING.EXE
5136	PING.EXE
4064	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2616 wrote to memory of 3696	2616	2026-10-22_aaab5d2e47d274af7798291a2918518e_elex_wannacry.exe	89
PID 3696 wrote to memory of 4540	3696	WINWORD.exe	90
PID 4540 wrote to memory of 2328	4540	cmd.exe	92
PID 4540 wrote to memory of 5136	4540	cmd.exe	93
PID 4540 wrote to memory of 4064	4540	cmd.exe	94
PID 4540 wrote to memory of 792	4540	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-22_aaab5d2e47d274af7798291a2918518e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_aaab5d2e47d274af7798291a2918518e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2616
- 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:3696
- - 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\0000586A" 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:4540
  - - 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:2328
  - - 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:5136
  - - 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:4064
  - - 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:792

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0000586A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000586A
Size 48KB
SHA256 719156186d35d26c191230ec171a23c2a43e6f15a8c88d35e23b571703f43c93
MD5 afc7b35bc84a6bf7ea2c207342e27e9d
SHA1 20c0f34859953292325b081d89ff8e7694fa885e
SHA512 bf58f74e583e959ed6155f9e57c2c4ebd7eb65221b59ea425af78f0fb92278e89d99e320e39d6e82516f649b6a6189d7d9ac084e05b3da47618fa31af9bbab65
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8H:bLy2Kerc64CiGImav42j0/
TLSH
T154234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 3d90ce2c50ea22efd18dd628fb6124810555fcd9f79a23190ae8087d31313bf4
MD5 aaab5d2e47d274af7798291a2918518e
SHA1 154d56bb3078d6973402d1a6a601e3061d3756eb
SHA512 5d4b519413126456de4047aac65ed211439bc9248c2418f3a25c491de8ae8cd96ad2206a1fbad204c26ef5984839968bb0b510a02e35325ce53266234b65c42d
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8+:bLy2Kerc64CiGImav42j0m
TLSH
T154234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/792-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/792-17-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2616-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2616-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3696-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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